Absorption
Definition: The process of taking in water and dissolved minerals and nutrients across cell membranes. This is different from ingestion.
Example: Plants absorb water and nutrients through their roots through Absorption.
Adaptive Behavior
Definition: In behavioral ecology, this refers to any behavior that contributes to an individual’s reproductive success and is therefore influenced by natural selection.
Example: Birds migrating to warmer regions during winter to increase their survival and reproductive success is an example of Adaptive behavior.
Adaptive Management
Definition: A systematic process for continually improving management policies and practices by learning from the outcomes of operational programs.
Example: A wildlife conservation program that adjusts its strategies based on annual monitoring and results so that it has the best chance of succeeding is an example of Adaptive Management.
Adoption
Definition: When an organism permanently assumes the role of parent towards a juvenile individual that is not its offspring.
Example: Some bird species will adopt and care for orphaned chicks of the same species, like duck. Also, Humans are a decent example.
Aerobic Metabolism
Definition: The process of cellular respiration that occurs in the presence of oxygen.
Example: Humans and other animals use aerobic metabolism to convert glucose and oxygen into energy.
Aerobic
Definition: Pertaining to the presence of free oxygen. Aerobic organisms require oxygen for their life processes.
Example: Most animals, including humans, are aerobic organisms.
Age Structure
Definition: The distribution of various age groups in a population, which typically forms the shape of a pyramid for a country or region.
Example: A population with a high number of young individuals and a smaller number of older individuals will have a pyramid-shaped age structure.
Agroecology
Definition: The science of applying ecological concepts and principles to the design, development, and management of agricultural environments.
Example: Using crop rotation and polyculture to maintain soil health and reduce pests in farming is an example of Agroecology.
Agroecosystem
Definition: An assembly of mutually interacting organisms and their environment in which materials related to crop production are interchanged in a largely cyclical manner.
Example: A rice paddy ecosystem where fish, plants, and bacteria interact to enhance soil fertility and crop yield.
Allee Effect
Definition: A biological concept characterized by the relationship between the size of the population and the growth rate of the species. Larger, healthier populations tend to grow well.
Example: A small population of animals may struggle to find mates, leading to a slower population growth rate is an example of the Allee effect.
Altruistic Behavior
Definition: Behavior in which the subject shows less concern for their own well-being and more for the welfare of others or offspring.
Example: Worker bees in a hive work tirelessly to support the queen and her offspring, even though they do not reproduce themselves.
Anaerobic Metabolism
Definition: The fermentation of organic compounds in which air is not breathed in, contrary to aerobic respiration which requires oxygen.
Metabolism in the absence of air is Anaerobic metabolism.
Example: Yeast cells perform anaerobic metabolism during the fermentation process to produce alcohol.
Anaerobic
Definition: Pertaining to the absence of free oxygen. Anaerobic organisms do not require oxygen for their life processes, and oxygen is toxic to many of them.
Example: Bacteria in deep-sea vents are anaerobic, thriving in environments without oxygen.
Animal Behavior
Definition: Studied in ethology and zoology, this refers to the desire to understand animals and their use of communication, emotions, sex, and other behaviors.
Example: Observing the complex social interactions and communication methods of dolphins.
Applied Ecology
Definition: The practice of employing ecological principles and understanding to solve real-world problems, including agroecology and conservation biology.
Example: Implementing green infrastructure in urban planning to reduce heat islands and improve air quality.
Area Effect (Island Biodiversity)
Definition: The hypothesis that larger islands can support more species than smaller islands.
Example: The Galápagos Islands, with their diverse range of habitats, support a wide variety of species.
Atmosphere
Definition: Earth’s atmosphere is composed of gases and water that are retained by Earth’s gravity, helping the Earth retain heat and reflect UV radiation.
Example: The atmosphere protects life on Earth by blocking harmful solar radiation and reducing temperature extremes between day and night.
Autecology
Definition: Also known as population ecology, it is a major subfield of ecology that deals with the dynamics of species populations and how these populations interact with the environment.
Example: Studying the population dynamics of wolves in Yellowstone National Park to understand their ecological impact.
Autopoiesis
Definition: An organized self-contained system whose parts and systems integrate seamlessly in a relationship of form and function.
Example: A living cell maintains its structure and functions through continuous self-renewal processes.
Autotroph
Definition: An organism that makes its own food from inorganic materials. Any organism capable of manufacturing its own food, either through photosynthesis or chemosynthesis
Example: Plants are autotrophs, using photosynthesis to convert sunlight, water, and carbon dioxide into food.
Behavioral Ecology
Definition: The study of the ecological and evolutionary basis for animal behavior, focusing largely on the individual level.
Example: Researchers study how different mating behaviors in birds affect their reproductive success.
Benthic
Definition: Organisms that live on the bottom of a body of water, unlike pelagic organisms that float freely.
Example: Starfish and crabs are benthic organisms found on the ocean floor.
Biodegradable
Definition: Capable of decaying through the action of living organisms.
Example: Food scraps are biodegradable and can decompose naturally in a compost heap.
Biodiversity
Definition: The variety and variability of plant and animal species in an environment.
Example: The Amazon rainforest has high biodiversity with thousands of different plant and animal species.
Biogeochemical Cycle
Definition: The pathway through which a chemical element or molecule moves through the atmosphere, hydrosphere, lithosphere, and biosphere.
Example: The water cycle describes the continuous movement of water on, above, and below the surface of the Earth.
Biogeochemistry
Definition: The study of the effects of living organisms on global chemistry and the cycles of matter and energy that transport Earth’s chemical components.
Example: Examining how soil microbes affect the carbon cycle is a part of biogeochemistry.
Biogeographic Realm
Definition: The largest scale of the Earth’s surface based on the distribution patterns of plants and animals.
Example: The Neotropical realm includes South America and the Caribbean, known for its unique flora and fauna.
Biogeography
Definition: The study of the distribution of organisms and the processes that influence their distribution patterns.
Example: Investigating why certain species of plants are found only in tropical climates.
Bioinvader
Definition: A nonnative species that invades an ecosystem.
Example: The zebra mussel is a bioinvader that has disrupted ecosystems in North American lakes and rivers.
Biological Magnification
Definition: The increase in concentration of a substance, such as a pesticide, as it moves up the food chain.
Example: DDT accumulation in the tissues of top predators like eagles is an example of biological magnification.
Biological/Biotic Factors
Definition: Living factors such as decomposers, scavengers, and predators that affect an ecosystem.
Example: Wolves are biotic factors that regulate prey populations in their habitats.
Biomass
Definition: The total mass of all living organisms in a given area.
Example: The biomass of a forest includes all the trees, plants, animals, and microorganisms within it.
Biomass Pyramid
Definition: A graphical representation showing the productivity at each trophic level in an ecosystem. Example: A biomass pyramid might show a large biomass of plants at the base and smaller biomass of herbivores and predators above.
Biome
Definition: A complex of biotic communities that occupy and characterize a particular area or zone.
Example: The desert biome is characterized by low rainfall and specialized plant and animal life.
Biomes
Definition: Major communities of the world, classified by predominant vegetation and adaptations of organisms to that environment.
Example: Tropical rainforests, grasslands, and tundras are all examples of different biomes.
Biosphere
Definition: The sphere of life, encompassing all living matter on Earth.
Example: The biosphere includes all ecosystems, from the deepest oceans to the highest mountains.
Biota
Definition: The total collection of organisms in a geographic region or during a specific time period. Example: The biota of the Great Barrier Reef includes a diverse range of fish, corals, and other marine life.
Biotic Potential
Definition: The maximum rate at which a population could increase under ideal conditions.
Example: Bacteria have a high biotic potential, capable of rapid population growth in optimal conditions.
Boreal Forest
Definition: Forest areas in the northern North Temperate Zone, predominantly made of coniferous trees, also known as taiga.
Example: The boreal forests of Canada are vast and filled with spruce, pine, and fir trees.
Boreal
Definition: Pertaining to the northern biotic area dominated by tundra, taiga, and coniferous forests. Example: Boreal regions experience long, cold winters and short, mild summers.
Camouflage
Definition: A method used to deceive or disguise from surroundings.
Example: Chameleons change their skin color to blend in with their environment as a form of camouflage.
Canopy
Definition: A layer of vegetation elevated above the ground, usually consisting of tree branches and epiphytes.
Example: In tropical forests, the canopy may be more than 100 feet above the ground and is home to many unique species.
Carbon Cycle
Definition: The biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of Earth.
Example: Plants absorb carbon dioxide during photosynthesis, which is a part of the carbon cycle.
Carnivore
Definition: An organism that primarily eats meat. Most carnivores are animals, but a few fungi, plants, and protists are as well.
Example: Lions are carnivores that hunt and consume other animals for food.
Carrying Capacity
Definition: The maximum number of individuals an environment can support, including the available food and water.
Example: The carrying capacity of a pasture is determined by the amount of grass available for grazing livestock.
Charismatic Megafauna
Definition: Large animal species with widespread popular appeal, often used by environmental activists to achieve conservation goals.
Example: The Giant Panda and Bengal Tiger are charismatic megafauna that help raise awareness for conservation efforts.
Chemical Ecology
Definition: The study of the ecological role of biological chemicals used in a wide range of areas, including defense against predators and attraction of mates.
Example: Certain plants release chemicals to deter herbivores from eating their leaves.
Climate
Definition: The long-term average weather pattern in a particular place.
Example: The climate of the Sahara Desert is characterized by extremely hot temperatures and very little rainfall.
Climate Change
Definition: Changes in weather conditions such as cloud cover, wind speed, temperature, rainfall, or humidity in a specific region.
Example: Increasing global temperatures and altered precipitation patterns due to greenhouse gas emissions.
Climax Community
Definition: A biological community of plants and animals that has reached a stable state, occurring when species are best adapted to average conditions in that area.
Example: A mature forest that has reached equilibrium with its environment.
Climax Pattern Model
Definition: A model where a community is adapted to various environmental factors that influence it over a region.
Example: The distribution of plant species in different habitats based on water availability and soil type.
Cohort
Definition: An individual in a population that is of the same species.
Example: A group of baby turtles hatched during the same season.
Commensalism
Definition: A symbiotic relationship between two organisms of different species in which one benefits while the other is unaffected.
Example: Barnacles attaching to a whale’s skin to gain access to nutrient-rich waters without harming the whale.
Communication Display
Definition: A pattern of behavior that is a social signal, sending messages through movement and vocalizations.
Example: Birds performing elaborate dances and songs to attract mates.
Communication Signal
Definition: Instinctive and learned behaviors by which animals send and receive information-laden cues encoded in stimuli.
Example: Honeybees using the “waggle dance” to communicate the location of food sources to hive mates.
Community
Definition: A group of various organisms living in the same environment.
Example: The different species of plants, animals, and microorganisms living in a rainforest.
Community Assembly Theory
Definition: Explains how environmentally similar sites have different species or similar species due to the resources they need or niche requirements.
Example: Different plant species dominating two similar grassland areas based on soil composition and water availability.
Community Ecology (Synecology)
Definition: Studies the interactions between species within an ecological community.
Example: Research on predator-prey relationships and how they influence community dynamics.
Community Structure
Definition: A series of close-knit groups that share common characteristics, forming a spider web pattern due to natural divisions in the community.
Example: The hierarchical organization of ant colonies with distinct roles and subgroups.
Competition
Definition: When organisms from the same or different species compete for food, living conditions, reproductive success, or other limited resources, leading to the survival and reproduction of the most fit individuals.
Example: Trees in a forest competing for sunlight and nutrients.
Competitive Exclusion Principle
Definition: States that two species cannot coexist if they compete for the same resource. One will have a small advantage, causing the other to become extinct.
Example: Grey squirrels outcompeting red squirrels in parts of Europe due to better adaptability to urban environments.
Composite Signal
Definition: A signal used to communicate, containing information within more than a single cue. Example: A dog growling and baring its teeth to signal aggression.
Coniferous Forest
Definition: A land biome characterized by large sections of land dominated by coniferous trees. Example: The taiga, or boreal forest, stretching across North America and Eurasia.
Conservation Biology
Definition: The scientific study of Earth’s biodiversity, aimed at protecting habitats and species from extinction.
Example: Efforts to save the critically endangered Amur leopard through habitat preservation and anti-poaching measures.
Conservation Ecology
Definition: The study of how to reduce the risk of species extinction.
Example: Implementing wildlife corridors to connect fragmented habitats and promote gene flow between animal populations.
Consumer (Environmental)
Definition: An organism, usually an animal, that feeds on plants or other animals.
Example: A lion eating a zebra.
Cooperation
Definition: The process of working or acting together, intentionally or not, encompassing harmony and side-by-side efforts, even in complex social patterns.
Example: A pack of wolves hunting together to take down larger prey.
Courtship Display
Definition: Ritual social behavior between potential mates.
Example: Male peacocks displaying their colorful tail feathers to attract females.
Cyst
Definition: A sac-like structure that encloses an organism in its resting or larval stage, such as a resting spore of an alga.
Example: Parasitic protozoa forming cysts to survive outside a host.
Deciduous Broadleaf Forest
Definition: A forest in a mild climate with dry seasons, where trees’ foliage changes with the varying seasons.
Example: The temperate deciduous forests of the eastern United States.
Decomposer
Definition: Organisms that break down substances into simpler substances.
Example: Fungi and bacteria decomposing dead plant and animal matter, returning nutrients to the soil.
Decomposition
Definition: The process by which tissues of dead organisms break down into simpler forms of matter and organic material, freeing up limited space in the biome.
Example: Fungi and bacteria decomposing a fallen tree in a forest.
Demographic Transition Model
Definition: A model that represents a shift from high birth and death rates to low birth and death rates as part of a country’s economic development.
Example: The transition seen in many Western countries from the 19th to the 20th century.
Demographics
Definition: The characteristics of human populations for social studies purposes.
Example: Census data showing the age distribution of a country’s population.
Denitrification
Definition: The breakdown of nitrates by anaerobic bacteria into other forms, typically in the soil. Example: Denitrifying bacteria converting nitrates in the soil to nitrogen gas.
Density Independent Factor
Definition: A factor that affects the size of a population regardless of its density.
Example: Natural disasters like hurricanes affecting population sizes irrespective of their density.
Density Dependent Factor
Definition: Factors that affect individuals of a population and vary with population density.
Example: Disease spreading more rapidly in densely populated areas.
Desert
Definition: A landscape that receives less than 10 inches of rain per year.
Example: The Sahara Desert in Africa.
Desert Ecology
Definition: The study of interactions between biotic and abiotic factors in desert biomes, including plants, animals, and bacteria.
Example: Examining how cacti store water and survive in arid conditions.
Desertification
Definition: The process by which areas become desert-like wastelands with low biodiversity. Example: The expansion of the Sahara Desert into surrounding savannah areas.
Desiccation
Definition: The process of drying out. In biology, it refers to moisture loss in organisms.
Example: A plant losing water and wilting during a drought.
Detrital Food Web
Definition: A food web depicting energy flow from photoautotrophs through detritivores and decomposers.
Example: Leaf litter decomposing and providing nutrients for soil organisms.
Detritivore
Definition: Heterotrophs that consume decomposing bits of organic matter, such as leaf litter. Example: Earthworms eating decomposing leaves in the soil.
Detritus
Definition: Accumulated organic debris from dead organisms, often an important source of nutrients in a food web.
Example: Dead plant material on the forest floor.
Disease
Definition: A condition where organisms suffer from impaired normal function due to genetic disorders, parasites, or pathogens like viruses, bacteria, or fungi.
Example: Influenza caused by the influenza virus.
Distance Effect (Island Biogeography)
Definition: The unique assemblage of life forms and species on an island due to its isolation. Example: The unique species of finches on the Galápagos Islands studied by Charles Darwin.
Dominance Hierarchy
Definition: The organization of individuals into groups with a social structure.
Example: A pack of wolves with an alpha leading the group.
Dominant Species
Definition: A species that characterizes and predominates an ecological community as measured by primary productivity or biomass.
Example: Oak trees dominating a deciduous forest.
Doubling Time
Definition: The amount of time it takes for a population to double in size.
Example: A human population with a growth rate of 2% per year doubling in about 35 years.
Dry Woodland
Definition: A biome that forms where rainfall averages around 40 to 100 centimeters, with many tall trees.
Example: Mediterranean woodlands with scattered oaks and pines.
Ecological Literacy
Definition: The ability to understand the natural systems that make life on Earth possible.
Example: Knowing how ecosystems function and the importance of biodiversity.
Ecological Productivity
Definition: The rate at which biomass is produced in an ecosystem.
Example: The high productivity of tropical rainforests due to abundant sunlight and rainfall.
Ecological Selection
Definition: Ecological processes that operate on a species’ inherited traits without reference to mating or secondary sex characteristics.
Example: Plants with drought-resistant traits surviving better in arid environments.
Ecological Succession
Definition: The process of change in the species structure of an ecological community over time. Example: A field gradually becoming a forest through stages of succession.
Ecology
Definition: The study of interactions between organisms and their environment.
Example: Researching the relationship between predators and prey in a savannah.
Ecophagy
Definition: The consumption of an ecosystem.
Example: Overgrazing by cattle leading to the destruction of grassland ecosystems.
Ecophysiology
Definition: The study of the interaction of physiological traits with the abiotic environment.
Example: Examining how plants adapt their physiology to survive in saline soils.
Ecopoiesis
Definition: The fabrication of a sustainable ecosystem on a currently lifeless, sterile planet.
Example: Theoretical models of creating ecosystems on Mars.
Ecoregion
Definition: A region defined by its geography and ecology.
Example: The Great Plains of North America, characterized by grassland ecology.
Ecosynthesis
Definition: The use of introduced species to fill niches in a disrupted environment, increasing the speed of ecological restoration.
Example: Introducing nitrogen-fixing plants to restore degraded lands.
Ecosystem
Definition: The total of interacting organisms (biocoenosis) and nonliving things (biotope) in a specific environment.
Example: A coral reef with its diverse marine life and physical environment.
Ecosystem Ecology
Definition: The study of how flows of energy and matter interact with biotic elements of ecosystems.
Example: Analyzing nutrient cycles in a forest ecosystem.
Ecosystem Modeling
Definition: The use of mathematics, computer programs, and models to understand and predict ecosystem behavior.
Example: Using computer simulations to predict the impact of climate change on coral reefs.
Ecosystem Services
Definition: Resources and processes that are provided by natural ecosystems and benefit organisms.
Example: Wetlands filtering pollutants from water, thus providing clean water.
Ecosystem
Definition: All the organisms in a particular region and the environment in which they live. The elements of an ecosystem interact with each other and depend on each other either directly or indirectly.
Example: A forest ecosystem includes trees, animals, plants, fungi, bacteria, and the physical environment.
Ecotone
Definition: A transition area between two adjacent but different landscape patches.
Example: The area where a forest meets a grassland.
Ecotoxicology
Definition: The study of the ecological role of toxic chemicals, including pollutants and naturally occurring compounds.
Example: Researching how pesticide runoff affects aquatic life in rivers.
Ecozone
Definition: An area characterized by natural origin features such as climate, terrain, and vegetation. It is the largest division of the Earth’s surface filled with living organisms.
Example: The Sahara Desert ecozone.
El Niño
Definition: A band of anomalously warm ocean water temperatures that occasionally develops off the western coast of South America and can cause climatic changes across the Pacific Ocean. Example: The 1997-1998 El Niño event caused severe weather changes worldwide.
Emigration
Definition: Leaving one’s native region to go to another.
Example: Birds emigrating to warmer areas during winter.
Endangered Species
Definition: A species with numbers so low that it risks becoming extinct.
Example: The Amur leopard, which is critically endangered.
Energy Pyramid
Definition: A graphical representation designed to show the biomass or productivity at each trophic level in a given ecosystem.
Example: An energy pyramid showing the energy transfer from plants to herbivores to carnivores.
Environment
Definition: The place in which an organism lives and the circumstances under which it lives, including factors like moisture and temperature as well as the physical location.
Example: The Arctic environment, characterized by cold temperatures and ice-covered landscapes.
Environmental Restoration
Definition: Repairing damage to an area caused by humans, natural disasters, or industry.
Example: Restoring wetlands that were drained for agricultural use.
Estuary
Definition: A body of water on the coast attached to the ocean and rivers or streams, often characterized by brackish water due to the mix of salt and fresh water.
Example: The Chesapeake Bay estuary.
Ethology
Definition: The study of animal behavior, also known as behavioral ecology, a branch of zoology. Example: Observing the mating rituals of birds to understand their reproductive strategies.
Eutrophication
Definition: An increase in chemical nutrients in an ecosystem, which can occur on land or in water, often leading to increased plant growth and sometimes harmful algal blooms.
Example: Algal blooms in lakes caused by runoff containing fertilizers.
Evaporation
Definition: The slow vaporization of water from the soil or surface water.
Example: Water evaporating from a lake during a hot day.
Evolutionary Ecology
Definition: The study of evolutionary changes in the context of the populations and communities in which organisms exist.
Example: Examining how environmental pressures lead to adaptations in a species over time.
Exotic Species
Definition: Introduced species that are not native or endemic to a habitat.
Example: The introduction of zebra mussels to North American waterways.
Exponential Growth
Definition: The consistent growth of a population at a rate proportional to its current size.
Example: Bacteria growing exponentially in a nutrient-rich environment.
Extinction
Definition: The complete die-off of a species, with no remaining individuals.
Example: The extinction of the dodo bird in the 17th century.
Fall Overturn
Definition: The mixing or “turning over” of water in autumn that reoxygenates the water.
Example: The mixing of lake water layers during fall, bringing oxygen to deeper layers.
Fire Ecology
Definition: The study of the role of fire in the environment of plants and animals and its effect on ecological communities.
Example: Understanding how controlled burns can maintain healthy prairies.
Fixed Action Pattern
Definition: A behavior that is performed the same way each time, independent of changes in the environment.
Example: The egg-rolling behavior of geese, where they retrieve displaced eggs in a specific manner.
Flagship Species
Definition: A species chosen to represent an environmental cause, such as an ecosystem in need of conservation.
Example: The Giant Panda as a symbol for wildlife conservation efforts.
Food Chain
Definition: A group of organisms interrelated by the fact that each member of the group feeds upon the one below it.
Example: A simple food chain might consist of grass, grasshoppers, frogs, and snakes.
Food Web
Definition: A set of interconnected food chains by which energy and materials circulate within an ecosystem.
Example: The complex food web in a marine ecosystem involving various fish, crustaceans, and marine mammals.
Foundation Species
Definition: A species that is a dominant primary producer in an ecosystem, both in terms of abundance and influence.
Example: Kelp in a kelp forest providing habitat and food for many marine organisms.
Founder Effect
Definition: The accumulation of random genetic changes in an isolated population, which can lead to reduced genetic diversity.
Example: A small population of animals colonizing an island, leading to a unique gene pool.
Frugivore
Definition: An animal that primarily eats fruit.
Example: Many species of bats and birds are frugivores, relying on fruits as their main food source.
Functional Ecology
Definition: The study of the roles or functions that certain species (or groups thereof) play in an ecosystem.
Example: Examining the role of bees in pollinating plants and their impact on ecosystem health.
Generalist
Definition: An organism that can survive under a wide variety of conditions and does not specialize to live under any particular set of circumstances.
Example: Raccoons are generalists, thriving in diverse environments from forests to urban areas.
Genetic Bottleneck
Definition: An evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing, reducing genetic diversity.
Example: The cheetah population experienced a genetic bottleneck during the last ice age, leading to low genetic variation.
Geographic Dispersal
Definition: When an organism moves into another region to join another community.
Example: Birds dispersing to new areas during migration.
Global Ecology
Definition: The study of ecological phenomena at the largest possible scale, addressing macroecological questions.
Example: Researching how global climate change affects biodiversity across continents.
Global Ecophagy
Definition: The consuming of an ecosystem.
Example: Overfishing leading to the collapse of marine ecosystems.
Global Warming
Definition: The increase in Earth’s average temperature of near-surface air and oceans.
Example: Rising global temperatures causing melting polar ice caps.
Grassland
Definition: A region where grass or grass-like vegetation grows as the dominant form of plant life.
Example: The Serengeti Plains in Africa.
Greenhouse Effect
Definition: Warming that results when solar radiation is trapped by the atmosphere, caused by gases that allow sunshine to pass through but absorb heat radiated back from the Earth’s surface.
Example: Carbon dioxide and methane contributing to the greenhouse effect and global warming.
Groundwater
Definition: Water found underground as a result of rainfall, ice, and snow melt, and submerged rivers, lakes, and springs. This water often carries minerals.
Example: Aquifers provide groundwater used for drinking water and irrigation.
Habitat
Definition: Specific ecological or environmental areas inhabited by specific plants and animal species.
Example: The rainforest is a habitat for many tropical birds and mammals.
Habitat Connectivity
Definition: Allowing for the conservation or maintenance of continuous or connected habitats to preserve movements and exchanges associated with the habitat.
Example: Wildlife corridors connecting fragmented forests to enable animal migration.
Habitat Corridors
Definition: A strip of land that helps with the movement of a species between disconnected areas of their natural habitat.
Example: Green bridges over highways to allow wildlife safe passage.
Habitat Fragmentation
Definition: The process of environmental change that involves the discontinuations or fragmenting of a species’ natural habitat.
Example: Urban development causing the fragmentation of woodland habitats.
Halophile
Definition: An organism that lives in areas of high salt concentration and must have special adaptations to survive under these conditions.
Example: Halobacteria thriving in the Dead Sea.
Herbivore
Definition: An organism that eats plants or other autotrophic organisms, primarily describing animals.
Example: Cows grazing on grass in a pasture.
Homeostasis
Definition: The property of a system that regulates the internal environment and maintains a constant and stable condition.
Example: Mammals maintaining a constant body temperature despite external temperature changes.
Host
Definition: An organism that has another organism on or in itself.
Example: Humans serving as hosts for tapeworms.
Human Ecology
Definition: A field of study that deals with relationships between humans and their societies; their natural, social, and created environments.
Example: Examining how urbanization impacts human health and local ecosystems.
Hydrologic Cycle
Definition: The cycle or process of evaporation and condensation of water, and its distribution across the Earth driven by solar energy.
Example: Water evaporating from oceans, forming clouds, and returning as precipitation.
Hydrosphere
Definition: The water vapor in the Earth’s atmosphere.
Example: The hydrosphere includes all of Earth’s water, such as oceans, rivers, and glaciers.
Hydrothermal Vent
Definition: An underwater steaming fissure that has unique ecosystems.
Example: Hydrothermal vents on the ocean floor support unique communities of organisms, including giant tube worms.
Illegitimate Receiver
Definition: An organism that is not intended to receive another organism’s signal but intercepts it anyway, to the fitness detriment of either the signaler or a legitimate receiver of the signal.
Example: A predator eavesdropping on mating calls of its prey.
Illegitimate Signaler
Definition: A predatory species that mimics signals to lure in their prey.
Example: Anglerfish using a bioluminescent lure to attract smaller fish.
Immigration
Definition: The one-way inward movement of individuals into another population or population area.
Example: Monarch butterflies migrating to Mexico for the winter.
Imprinting
Definition: A time-dependent form of learning triggered by exposure to sign stimuli.
Example: Ducklings following the first moving object they see, usually their mother.
Indicator Species
Definition: Any biological species that defines a trait or characteristic of the environment. The presence and/or abundance of these species are typically used to indicate the health of an ecosystem.
Example: Frogs as indicator species for environmental health due to their sensitivity to pollution.
Ingestion
Definition: The intake of water or food particles by “swallowing” them, taking them into the body cavity or into a vacuole. Contrast with absorption.
Example: Humans ingesting food during a meal.
Inorganic
Definition: Not containing carbon. Not from living things, such as minerals, water, and oxygen.
Example: Inorganic compounds like water and salts are essential for life processes.
Instinctive Behavior
Definition: Behavior that occurs when an animal has a particular internal state while it is in the presence of an external stimulus called a releaser.
Example: Birds building nests without having seen other birds do it.
Intermediate Disturbance Hypothesis
Definition: A theory that predicts species diversity will change with varying levels of disturbance.
Example: Moderate levels of forest fires can increase plant diversity by preventing any single species from dominating.
Interspecific Competition
Definition: Occurs when different species try to use the same resources in an environment.
Example: Lions and hyenas competing for the same prey.
Intertidal Zone
Definition: The coastal area exposed to the air during low tide.
Example: Rocky shores that are underwater at high tide and exposed at low tide.
Intertidal
Definition: The coastal zone measuring from the lowest to the highest tide mark, subject to alternating periods of flooding and drying.
Example: The area of a beach that is covered with water at high tide and exposed during low tide.
Invasive Species
Definition: A nonnative species whose introduction to an area is likely to cause economic, environmental, or health harm.
Example: The introduction of the zebra mussel to North American waterways.
Ion Exchange
Definition: A reversible chemical reaction where ions with the same charge can be switched, used in purification.
Example: Water softeners use ion exchange to replace calcium ions with sodium ions.
Jungle
Definition: A large, undeveloped, humid forest that is home to many wild plants and animals. Example: The Amazon Rainforest.
Kelp Forest
Definition: Marine ecosystems dominated by large kelps, restricted to cold and temperate waters, most common along the western coasts of continents.
Example: Kelp forests off the coast of California.
Keystone Species
Definition: A species that has a disproportionate effect on its environment relative to its abundance, affecting many other organisms and helping determine the types and numbers of various other species in a community.
Example: Sea otters in kelp forests help control sea urchin populations, protecting the kelp.
K-Selected Species
Definition: Species that are strong competitors in crowded environments, producing fewer but stronger offspring.
Example: Elephants, which have long gestation periods and invest heavily in each offspring.
La Niña
Definition: A climatic event characterized by cooler-than-average sea surface temperatures in the central and eastern tropical Pacific Ocean.
Example: La Niña events often lead to increased rainfall in the western Pacific and drought conditions in the eastern Pacific.
Lake
Definition: A body of liquid on the Earth’s surface, inland, not part of an ocean, and fed by a river. Example: Lake Victoria in Africa.
Landscape Ecology
Definition: The study of the interactions between discrete elements of a landscape.
Example: Examining how forests, rivers, and urban areas interact within a watershed.
Learned Behavior
Definition: A type of action or reflex that an organism learns.
Example: A dog being trained to sit on command.
Lek
Definition: A type of animal territory where males of certain species gather to demonstrate their prowess before or during mating season.
Example: Male sage grouse performing courtship displays in leks to attract females.
Limiting Factor
Definition: Any essential resource that is in short supply in an environment.
Example: Water being a limiting factor in a desert ecosystem.
Limnology
Definition: The study of river system ecology and life.
Example: Researching the effects of pollution on freshwater ecosystems.
Lithosphere
Definition: The solid outer part of the Earth, including the crust and the brittle upper portion of the mantle.
Example: The Earth’s tectonic plates are part of the lithosphere.
Litter
Definition: Leaf litter, or forest litter, is the detritus of fallen leaves and bark that accumulates in forests.
Example: The layer of dead leaves on the forest floor.
Logistic Curve
Definition: An S-shaped curve that usually represents population growth.
Example: The population growth of a species that initially grows rapidly, then slows as it reaches carrying capacity.
Lotka-Volterra Equation
Definition: An ecological model describing predator-prey interactions.
Example: The equations predicting the oscillating populations of rabbits and foxes.
Macroecology
Definition: The study of large-scale ecological phenomena.
Example: Analyzing patterns of species diversity across different continents.
Macroscopic
Definition: Objects or organisms large enough to be seen with the naked eye.
Example: Adult elephants are macroscopic organisms.
Mangrove Wetland
Definition: Wetlands found in subtropic climates, characterized by mangrove trees that provide habitat for many marine organisms.
Example: The mangrove forests along the coast of Florida.
Marine Ecology
Definition: The study of aquatic ecosystems where water is the dominant environmental medium. Example: Researching coral reef ecosystems and their inhabitants.
Marine Snow
Definition: Tiny particles, including dead organic matter, from the upper layers of the ocean that sink deep into the ocean.
Example: Detritus falling from the ocean surface to the deep sea, providing food for deep-sea organisms.
Marine
Definition: Refers to the ocean.
Example: Marine biology is the study of oceanic life forms.
Mark and Recapture
Definition: A method used to estimate populations and find survival rates, movement, and growth. Example: Tagging and releasing fish to estimate the population size in a lake.
Mesopredator Release Hypothesis
Definition: A hypothesis that states as top predators dwindle in an ecosystem, the populations of mesopredators increase.
Example: Decline in wolf populations leading to an increase in coyote numbers.
Metabolic Theory of Ecology
Definition: A theory that explains the relationship between an organism’s body mass and its metabolic rate.
Example: Larger animals, like elephants, have slower metabolic rates than smaller animals, like mice.
Microbial Ecology
Definition: The study of the ecology of microorganisms.
Example: Researching the role of bacteria in nutrient cycling within soil ecosystems.
Microclimate
Definition: An area influenced by either natural or man-made features that change the climatic conditions from the normal regional climate.
Example: The shaded area under a large tree having cooler temperatures than the surrounding open field.
Microecology
Definition: The study of small-scale ecological phenomena.
Example: Examining the interactions between different species of bacteria in a petri dish.
Microscopic
Definition: Objects or organisms that are too small to be seen with the naked eye.
Example: Observing cells and microorganisms using a microscope.
Migration
Definition: The movement of organisms from one place to another.
Example: Monarch butterflies migrating from North America to Mexico for the winter.
Mimicry
Definition: Imitative behavior where animal species resemble one another.
Example: Viceroy butterflies mimicking the appearance of toxic Monarch butterflies to avoid predators.
Molecular Ecology
Definition: A field of evolutionary biology concerned with applying molecular population genetics, molecular phylogenetics, and genomics to traditional ecological questions.
Example: Using DNA analysis to study the genetic diversity of a population.
Molecular Engineering
Definition: The creation of molecules through the use of technology.
Example: Designing synthetic enzymes for industrial applications.
Monsoon
Definition: Air circulation patterns that influence the continents north or south of warm oceans. Example: The South Asian monsoon bringing heavy rains to India during the summer.
Monsoonal
Definition: Describes a climate pattern with a wind system that changes direction with the seasons; dominant over the Arabian Sea and Southeast Asia.
Example: The monsoonal climate of Southeast Asia leading to distinct wet and dry seasons.
Morphology
Definition: The form and structure of anything, usually applied to the shapes, parts, and arrangement of features in living and fossil organisms.
Example: Studying the morphology of dinosaur fossils to understand their physical characteristics.
Mutualism
Definition: A biological interaction between individuals of two different species, where each individual derives a fitness benefit. It includes relationships that are mutualistic, parasitic, or commensal.
Example: Bees pollinating flowers while obtaining nectar for food.
Natural Resource
Definition: Naturally forming substances considered valuable in their natural or unrefined form. Example: Freshwater sources, such as rivers and lakes, are natural resources essential for life.
Natural Selection
Definition: The process by which certain traits become more or less common in a species due to the effects on the survival and reproduction of individuals with those traits.
Example: Giraffes with longer necks being more likely to survive and reproduce, passing on the trait to future generations.
Negative Feedback Loop
Definition: Feedback that reduces the output of a system to maintain stability.
Example: When the temperature rises in a room, the thermostat turns off the heater to keep the temperature stable.
Neutralism
Definition: The belief that changes in evolution are caused by random mutation rather than by natural selection.
Example: Genetic drift causing changes in allele frequencies in a population.
Niche
Definition: The position or function of an organism in a community of related organisms.
Example: A honeybee’s niche includes pollinating flowers and producing honey.
Nitrification
Definition: The oxidation of ammonia with oxygen into nitrite.
Example: Soil bacteria converting ammonia from decomposing organic matter into nitrites and nitrates that plants can absorb.
Nitrogen Cycle
Definition: The continuous cycle by which nitrogen from the atmosphere and compounded nitrogen are exchanged through the soil into substances that can be taken up and used by green plants, with the remaining nitrogen returning to the air as a result of denitrification.
Example: The nitrogen cycle involves processes such as nitrogen fixation, nitrification, and denitrification.
Nitrogen Fixation
Definition: The conversion of gaseous nitrogen into a form usable by plants, usually by bacteria. Example: Rhizobium bacteria in the root nodules of legumes fixing atmospheric nitrogen into ammonia.
Nocturnal
Definition: Active only at night.
Example: Owls are nocturnal birds that hunt for prey during the night.
Nutrient
Definition: A substance that provides nourishment and promotes growth.
Example: Nitrogen and phosphorus are essential nutrients for plant growth.
Nutrient Cycling
Definition: The processes by which nutrients are transferred from one organism to another.
Example: The carbon cycle includes the uptake of carbon dioxide by plants, ingestion by animals, and respiration and decay of the animals.
Ocean
Definition: The large body of saltwater that covers almost 75% of the Earth’s surface.
Example: The Pacific Ocean is the largest ocean on Earth.
Omnivore
Definition: An organism that eats both plants and animals.
Example: Bears are omnivores that eat berries, fish, and small mammals.
Organic
Definition: Pertaining to compounds containing carbon. Also refers to living things or the materials made by living things. Opposite of inorganic.
Example: Organic matter includes plant and animal remains.
Paleoecology
Definition: A science that seeks to understand the relationships between species in fossil assemblages.
Example: Studying pollen fossils to reconstruct past climates and vegetation.
Parasite
Definition: An organism that survives with another through a symbiotic relationship with its host, which it does not usually kill directly but negatively affects.
Example: Tapeworms living in the intestines of animals.
Parasitoid
Definition: An organism that is a parasite for most of its life and usually kills its host.
Example: Parasitic wasps laying their eggs inside caterpillars.
Pathogenic
Definition: An organism that causes disease within another organism.
Example: The bacterium Streptococcus pneumoniae causing pneumonia in humans.
Pelagic
Definition: Refers to organisms that swim through the ocean and may rise to the surface or sink to the bottom, not confined to the ocean floor.
Example: Pelagic fish like tuna and mackerel.
Per Capita
Definition: A measurement indicating “per unit of population.”
Example: Per capita income refers to the average income per person in a region.
Periphyton
Definition: Dense strands of algal growth that cover the water surface between emergent aquatic plants.
Example: Spirogyra algae forming green mats on the surface of ponds.
Permafrost
Definition: A permanently frozen layer of terrain found beneath the Arctic tundra.
Example: Permafrost is common in regions like Siberia and Alaska.
Pheromone
Definition: A chemical typically given off into the environment as a signal, causing a natural behavioral response in members of the same species.
Example: Ants release pheromones to communicate the location of food sources to other ants.
Phosphorus Cycle
Definition: The biogeochemical cycle describing the movement of phosphorus through the environment.
Example: Phosphorus moving from rocks into soil, then taken up by plants and animals, and returned to the environment through decomposition.
Photic Zone
Definition: The region of the ocean through which light penetrates, where photosynthetic marine organisms live.
Example: The upper layer of the ocean where sunlight supports the growth of phytoplankton.
Phytoplankton
Definition: Tiny, free-floating photosynthetic organisms in aquatic systems, including diatoms, desmids, and dinoflagellates.
Example: Phytoplankton form the base of the marine food web.
Pioneer Species
Definition: Species that first inhabit an environment that was previously unoccupied.
Example: Lichens and mosses colonizing bare rock.
Plankton
Definition: Very small, free-floating organisms of the ocean or other aquatic systems, including phytoplankton, which produce their own nutrients through photosynthesis, or zooplankton, which get their nutrients from other organisms.
Example: Krill are a type of zooplankton that feed on phytoplankton.
Political Ecology
Definition: A theoretical lens focusing on how political and economic power affects ecology and how ecology can shape the political economy by understanding and analyzing environmental influences on social activity.
Example: Studying how deforestation policies impact indigenous communities and biodiversity.
Pollination
Definition: A type of fertilization and reproduction where the transportation of pollen grains from plants to ovule-bearing organs occurs, facilitated by wind, water, or animals.
Example: Bees pollinating flowers as they collect nectar.
Pollinator
Definition: An animal that carries pollen from one seed plant to another, aiding in the plant’s reproduction.
Example: Butterflies, bees, birds, and bats are common pollinators.
Population Density
Definition: The number of individuals of a species living per unit area.
Example: The population density of deer in a forest.
Population Distribution
Definition: The pattern of where people and animals live. Distribution is uneven, with some places sparsely populated and others densely populated.
Example: Urban areas have high population density, while rural areas have low population density.
Population Ecology (Autecology)
Definition: The study of the dynamics of populations within species and their interactions with environmental factors.
Example: Researching the population growth and decline of a particular bird species in a habitat.
Population Pyramid
Definition: A graphic illustration showing the age structure in a population, typically forming the shape of a pyramid.
Example: A population pyramid of a developing country with a broad base representing a high number of young people.
Population Size
Definition: The number of individuals of a species in a particular geographic range.
Example: The population size of polar bears in the Arctic region.
Predation
Definition: The interaction among populations when one organism consumes another.
Example: A lion hunting and eating a zebra.
Predator
Definition: An organism that lives by killing and consuming another living organism.
Example: A hawk preying on mice.
Prey
Definition: Living organisms that predators feed on.
Example: Rabbits are prey for foxes.
Primary Producer
Definition: An autotroph that obtains energy directly from the nonliving environment through photosynthesis or, less commonly, chemosynthesis.
Example: Grass in a meadow, converting sunlight into energy through photosynthesis.
Primary Production
Definition: The production of organic compounds from carbon through photosynthesis, affecting all life on Earth either directly or indirectly.
Example: Plants converting carbon dioxide and sunlight into glucose and oxygen.
Producer
Definition: Any organism that brings energy into an ecosystem from inorganic sources. Most plants and many protists are producers.
Example: Green algae in a pond producing oxygen and food through photosynthesis.
Protocooperation
Definition: An interaction between two species where both benefit.
Example: Clownfish and sea anemones protecting each other from predators.
Quadrat
Definition: 1. A piece of type metal used for filling spaces. 2. A plot used for ecological or biological sampling.
Example: Using a quadrat to measure the number of plant species in a square meter of forest floor.
Rain Shadow
Definition: A dry area of land leeward of a mountain range resulting in arid or semi-arid conditions. Example: The Great Basin Desert in Nevada lies in the rain shadow of the Sierra Nevada mountains.
Reproductive Base
Definition: All members of a population that are of reproductive and pre-reproductive ages.
Example: The reproductive base of a deer population includes fawns and adult deer capable of reproducing.
Resource
Definition: A substance or object in the environment required by an organism for normal growth, maintenance, and reproduction.
Example: Water is a critical resource for plants and animals.
Resource Partitioning
Definition: When two or more species share and compete for a resource in different ways to coexist. Example: Different bird species feeding on different parts of the same tree.
Restoration Ecology
Definition: The scientific study of the processes needed to restore impaired or damaged ecosystems.
Example: Replanting native vegetation to restore a degraded wetland.
Riparian
Definition: Relating to the edges of streams or rivers.
Example: Riparian vegetation includes plants growing along riverbanks.
R-Selected Species
Definition: Species selected for their ability to thrive in variable or unpredictable environments. Example: Mice, which reproduce quickly and in large numbers.
Runoff
Definition: The flow of water over land from rain, melting snow, or other sources.
Example: Runoff from a storm can carry pollutants into rivers and lakes.
Salinity
Definition: A measure of the salt concentration in water. Higher salinity means more dissolved salts. Example: The salinity of ocean water is about 35 parts per thousand.
Saprophyte
Definition: An organism that feeds on dead and decaying organisms, recycling nutrients back into the ecosystem.
Example: Fungi decomposing fallen leaves on the forest floor.
Savanna
Definition: A flat grassland with scattered trees in tropical or subtropical regions.
Example: The African savanna is home to elephants, giraffes, and lions.
Scavenger
Definition: An organism that feeds on dead and dying organisms.
Example: Vultures eating the remains of dead animals.
Seaweed
Definition: Any large photosynthetic protist, including rhodophytes and kelps. Seaweeds are not true plants but produce their own food like plants. Example: Kelp forests along the coast of California.
Secondary Succession
Definition: Succession that occurs after the original population has been destroyed or disturbed. Example: Forest regrowth after a wildfire.
Selfish Behavior
Definition: Behavior where an individual, despite the potential impact on the population, increases its own chances of reproducing.
Example: A bird stealing food from others to ensure its own survival.
Selfish Herd
Definition: How individuals in a group can act together without planned direction.
Example: Fish swimming in a school to reduce individual predation risk.
Sexual Selection
Definition: A trait that makes an individual more likely to find a mate than others.
Example: The bright plumage of male peacocks attracting females.
Sign Stimulus
Definition: Fixed action patterns triggered by specific stimuli.
Example: A stickleback fish attacking anything with a red underside during mating season.
Signal Receiver
Definition: The individual responding to communication signals sent by the signaler.
Example: A female bird responding to a male bird’s mating call.
Signaler
Definition: An individual that captures the attention of others through specific signals.
Example: A firefly flashing its light to attract mates.
Social Behavior
Definition: Behavior of an individual towards society and members of the same species as a whole.
Example: Bees working together in a hive.
Social Parasite
Definition: An organism that latches onto another group or individual to benefit itself, often affecting the original group negatively.
Example: Cuckoo birds laying their eggs in other birds’ nests.
Soil
Definition: The naturally occurring, unconsolidated or loose covering on the Earth’s surface.
Example: Soil provides nutrients and a growing medium for plants.
Soil Ecology
Definition: The study of the ecology of the pedosphere.
Example: Researching the role of soil microbes in nutrient cycling.
Song System
Definition: A series of discrete brain nuclei used to produce and learn certain songs of songbirds.
Example: Studying the song system of canaries to understand how they learn their songs.
Source-Sink Dynamics
Definition: A theoretical model used by ecologists to describe how variation in habitat quality may affect the population growth or decline of organisms.
Example: In a source-sink dynamic, a high-quality habitat (source) supports a population that disperses to a lower-quality habitat (sink).
Southern Pine Forests
Definition: A forest consisting of pine species that thrive in the sandy, dry, and nutrient-poor soil on the coastal plains of the South Atlantic and Gulf states.
Example: Longleaf pine forests found in the southeastern United States.
Specialist
Definition: An organism that has adopted a lifestyle specific to a particular set of conditions, contrasting with generalists.
Example: The koala, which feeds almost exclusively on eucalyptus leaves.
Speciation
Definition: The evolutionary process through which new biological species arise.
Example: The Galápagos finches evolving into multiple species with different beak shapes.
Spring Overturn
Definition: The mixing of lake waters through the melting of ice cover, warming of surface waters, convection currents, and wind action in spring.
Example: Spring overturn in a temperate lake ensures oxygen and nutrients are evenly distributed.
Stream
Definition: A flowing water ecosystem that starts as freshwater springs or seeps.
Example: A mountain stream flowing into a larger river.
Substrate
Definition: The supporting surface on which an organism grows. It may provide structural support, water, and nutrients. Substrates can be inorganic (rock, soil) or organic (wood).
Example: Moss growing on a rock surface.
Survivorship Curve
Definition: A graph showing the number or proportion of individuals surviving at each age for a given species.
Example: A Type I survivorship curve, typical of humans, shows high survival rates in early and middle life, with a drop in older age.
Symbiosis
Definition: A non-predator-prey interaction between individuals of different species, including mutualism, parasitism, and commensalism.
Example: Mutualism between bees and flowers, where bees get nectar, and flowers get pollinated.
Tactile Display
Definition: When a signaler touches the receiver in ritualized ways as a form of communication.
Example: Grooming behavior in primates to strengthen social bonds.
Temperate
Definition: Regions where the climate undergoes seasonal changes in temperature and moisture, primarily between 30 and 60 degrees latitude in both hemispheres.
Example: The temperate climate of the northeastern United States with distinct winter and summer seasons.
Terrestrial
Definition: Living on land, as opposed to marine or aquatic.
Example: Terrestrial mammals like elephants and lions.
Territory
Definition: An area that one or more individuals defend against competition.
Example: A wolf pack’s territory marked and defended from other packs.
Theoretical Ecology
Definition: The development of ecological theory using mathematical, statistical, and computer modeling tools.
Example: Using computer models to predict the impact of climate change on species distribution.
Threat Display
Definition: A signal used by certain species to show that they intend to attack.
Example: A cobra displaying its hood as a threat display to potential predators.
Total Fertility Rate
Definition: The average number of children a mother bears in a population during her reproductive years.
Example: The total fertility rate in a given country indicating population growth trends.
Trophic Level
Definition: The position of an organism in the food chain, based on what it eats and what eats it.
Example: Herbivores like deer are primary consumers at the second trophic level.
Tropical Rain Forest
Definition: A biome characterized by regular, heavy rainfall, high humidity (80+ percent), and high biodiversity.
Example: The Amazon Rainforest with its diverse species of plants and animals.
Tropical
Definition: Regions where the climate undergoes little seasonal change in temperature or rainfall, primarily between 30 degrees north and south of the equator.
Example: The tropical climate of Hawaii, with consistent warm temperatures and year-round rainfall.
Tundra
Definition: A vast, mostly flat, treeless Arctic region of Europe, Asia, and North America, where the subsoil is permanently frozen. The dominant vegetation includes low-growing lichens, mosses, and stunted shrubs.
Example: The Arctic tundra is home to animals like the Arctic fox and caribou.
Ultra Plankton
Definition: A large breed of plankton found in marine environments.
Example: Ultra plankton play a crucial role in the marine food chain, serving as food for larger organisms like fish and whales.
Umbrella Species
Definition: Species selected for conservation-related decisions because protecting these species indirectly protects many other species within their ecological community.
Example: The conservation of the giant panda helps protect the biodiversity of its habitat, including other species like the red panda and various plants.
Upwelling
Definition: The upward movement of deeper, colder water to the ocean’s surface, often caused by winds blowing away from the coastline. This process brings nutrients from the ocean floor to the surface, increasing the productivity of the ecosystem.
Example: The coast of Peru experiences significant upwelling, which supports its rich marine life, including anchovies and seabirds.
Urban Ecology
Definition: The study of ecosystems in urban areas, focusing on the interactions between living organisms and their urban environment.
Example: Urban ecologists study how birds adapt to living in cities and the impact of urban green spaces on biodiversity.
Virus
Definition: An infectious agent that can only be seen under a microscope and can only grow and reproduce inside a host cell. Viruses can infect all forms of cellular life.
Example: The influenza virus causes the flu, a common respiratory infection.
Warning Coloration
Definition: Bright colors or patterns used by prey to warn predators of their toxicity or unpleasant taste.
Example: The bright colors of poison dart frogs signal to predators that they are toxic.
Water Cycle (Hydrologic Cycle)
Definition: The continuous movement of water on, above, and below the Earth’s surface, changing between liquid, vapor, and ice.
Example: Rainwater evaporates from the ocean, forms clouds, and returns to the earth as precipitation, illustrating the water cycle.
Water Vapour
Definition: The gaseous state of water, often present in the atmosphere.
Example: Water vapor is a key component of the Earth’s weather system and is visible as steam from boiling water.
Watershed
Definition: The land area where water from rain and snow drains downhill into a body of water such as a river, lake, reservoir, estuary, wetland, sea, or ocean.
Example: The Mississippi River watershed covers a vast area, draining water from numerous states into the Gulf of Mexico.
Web of Life (Food Web)
Definition: The complex network of feeding relationships between different species in an ecosystem.
Example: In a forest ecosystem, the web of life includes plants, herbivores like deer, and predators like wolves.
Xeric
Definition: Extremely dry.
Example: Xeric environments, such as deserts, are characterized by minimal rainfall and sparse vegetation.
Xylophagous
Definition: Feeding on wood.
Example: Termites are xylophagous insects that can cause significant damage to wooden structures.
Yellow Rain
Definition: A powdery, poisonous yellow substance reported as falling from the air in Southeast Asia, found to be the excrement of wild honeybees contaminated by a fungal toxin.
Example: Reports of yellow rain in Southeast Asia led to investigations into its origins and effects on health.
Zero Population Growth
Definition: A situation in which the population of a given area does not increase or decrease over a period of time.
Example: Some developed countries aim for zero population growth to maintain economic and environmental stability.
Zooplankton
Definition: Tiny, free-floating organisms in aquatic systems that cannot produce their own food and are consumers, unlike phytoplankton.
Example: Zooplankton are a critical food source for many marine animals, including fish and whales.