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Ecology
Ecology Vocabulary
| Question | Answer |
|---|---|
| Autotroph | an organism capable of producing its own food and organic nutrients using inorganic materials (such as carbon dioxide, water, and minerals) and an external energy source, typically sunlight or chemical reactions |
| Heterotroph | an organism that cannot produce its own food and must obtain energy and carbon by consuming other organisms (plants, animals, or microorganisms) or organic matter |
| Organism | an individual living entity capable of growing, metabolizing nutrients, responding to stimuli, and reproducing |
| Habitat | the natural environment in which a particular species, population, or individual organism lives, grows, and reproduces |
| Biotic factor | the living components of an ecosystem that shape their environment, including organisms, their interactions, and waste |
| Abiotic factor | the non-living physical and chemical components of an ecosystem that affect living organisms and the functioning of the environment |
| Species | a group of organisms that can interbreed in nature and produce fertile offspring |
| Population | a group of organisms of the same species that live in the same geographic area at the same time and are capable of interbreeding. |
| Community | a collaborative research approach where the public partners with professional scientists to collect, analyze, and share meaningful data, accelerating research on issues like ecology, biodiversity, and public health |
| Ecosystem | a dynamic, functional unit comprising all living organisms (biotic factors) in a specific area interacting with each other and their non-living physical environment (abiotic factors), such as air, water, soil, and sunlight |
| Ecology | the scientific study of the interactions between living organisms (biotic) and their physical, non-living environment (abiotic) |
| immigration | the movement of individuals into a new country, region, or habitat, typically with the intention of residing or settling there |
| Emigration | the scientific, demographic, or ecological act of leaving a habitat, region, or country to settle permanently in another |
| Population density | the number of individuals of a specific species (or total human population) living within a defined, measured unit of geographic area |
| Limiting factor | any biotic (living) or abiotic (non-living) variable in an ecosystem that restricts the size, growth, or distribution of a population |
| Carrying capacity | any biotic (living) or abiotic (non-living) variable in an ecosystem that restricts the size, growth, or distribution of a population |
| Natural selection | the scientific process by which populations of living organisms adapt and change over time |
| Adaptation | In science, an adaptation is a heritable structural, physiological, or behavioral trait that evolves via natural selection, improving an organism’s survival and reproduction in its environment. It refers to both the current trait |
| Niche | the functional role and position a species has in its environment, including how it survives, reproduces, and uses resources |
| Competition | the functional role and position a species has in its environment, including how it survives, reproduces, and uses resources |
| Predation | a biological interaction where one organism (the predator) kills and consumes another (the prey) for energy and nutrients |
| Mutualism | a type of symbiotic, interspecific interaction where both species involved receive benefits, such as increased survival, growth, or reproduction |
| Commensalism | a type of long-term biological interaction (symbiosis) between two species where one organism benefits (the commensal) while the other organism is neither helped nor harmed (the host). |
| Parasitism | a non-mutual symbiotic relationship between species, where one organism (the parasite) lives on or inside another (the host), gaining nutrients and benefits at the host's expense |
| Parasite | an organism that lives on or inside a host organism (another species) and obtains nutrients and shelter at the host's expense, often causing harm or disease while reducing the host's fitness |
| Host | a living organism—animal or plant—that provides sustenance, shelter, or a habitat for a smaller organism, known as a symbiont (parasite, mutualist, or commensal) |
| Succession | the gradual, natural process of change in the species structure of an ecological community over time |
| Primary succession | the process of ecological development that begins in an essentially lifeless, barren habitat, where there is no soil, no seeds, and no pre-existing vegetation |
| Pioneer species | the first hardy organisms to colonize barren, disrupted, or newly formed ecosystems, initiating ecological succession |
| Secondary succession | the process of ecological recovery and community re-colonization in an area where a previous ecosystem was disturbed, removed, or destroyed, but where soil and nutrients already remain |
| Producer | an organism—typically a plant, alga, or bacterium—that makes its own food (complex organic compounds) from simple inorganic molecules. |
| Consumer | an organism that obtains its energy and nutrients by feeding on other organisms or organic matter |
| Herbivore | an organism adapted to survive by eating only plants, algae, and photosynthetic bacteria |
| Carnivore | an organism, typically an animal, that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue (flesh) through predation or scavenging |
| Omnivore | an animal or organism that obtains energy and nutrients by consuming both plant and animal matter, along with fungi, algae, or bacteria |
| Scavenger | an organism or chemical agent that consumes, removes, or deactivates decaying biomass, carrion, or waste materials in an ecosystem or chemical system |
| Decomposer | a heterotrophic organism—primarily bacteria, fungi, and certain invertebrates—that breaks down dead organic material (detritus), such as dead plants, animal carcasses, and waste products |
| Food chain | a linear sequence that shows how energy and nutrients are transferred from one organism to another within an ecosystem |
| Food web | a complex network of interconnecting and overlapping food chains that illustrates the feeding relationships, energy flow, and nutrient cycling between species within a specific ecosystem |
| Energy pyramid | a graphical representation designed to show the flow of energy through the different trophic levels in an ecosystem. |
| Nitrogen fixation | is the chemical process by which atmospheric nitrogen ( ), which is relatively inert and unusable by most organisms, is converted into ammonia ( ) or related nitrogenous compounds. |
| Biome | a large, distinct geographical biotic unit—a major community of plants and animals—characterized by its dominant vegetation, specific animal life, and regional climate |
| Climate | the long-term, statistical average of weather patterns—including temperature, precipitation, and wind—typically measured over 30 years or more |
| Desert | A desert is scientifically defined as a landscape or biome that receives extremely low amounts of precipitation, typically less than(10 inches) per year. |
| Rain forest | A rainforest is a dense, high-biomass ecosystem characterized by tall, primarily evergreen trees, high humidity, and, scientifically, an annual rainfall of at least (). |
| Emergent layer | the topmost stratum of a tropical rainforest, consisting of the tallest trees that rise above the general canopy, often reaching heights of 60 to 70 meters (approx. 200–250 feet) |
| Canopy | he aboveground portion of a plant community or crop, consisting of the collection of individual tree crowns, branches, and leaves |
| Understory | the layer of vegetation in a forest or woodland that grows beneath the main canopy, but above the forest floor, typically including saplings, shrubs, herbs, ferns, and vines |
| Grassland | a biome or ecosystem characterized by vegetation dominated by grasses (Poaceae), sedges, and rushes, with few or no trees |
| Savanna | a mixed woodland-grassland biome characterized by scattered, widely spaced trees and shrubs that allow sunlight to reach the ground, supporting a continuous, dominant herbaceous layer of grasses |
| Deciduous tree | plants that shed their leaves annually, typically during autumn in temperate climates or the dry season in tropical climates |
| Boreal forest | the world's largest terrestrial biome, a high-latitude northern coniferous forest defined by cold climates, long winters, and short growing seasons |
| Coniferous tree | scientific woody plants, mostly evergreen, classified as gymnosperms |
| Tundra | a cold, treeless biome characterized by extremely low temperatures, minimal precipitation, and a short growing season |
| Permafrost | Permafrost is defined by scientists as ground—soil, rock, or sediment—that remains at or below for at least two consecutive years. |
| Estuary | a partially enclosed coastal body of brackish water |
| Intertidal zone | the scientifically defined coastal ecosystem spanning from the highest high-tide mark to the lowest low-tide mark |
| Neritic zone | the shallow, nutrient-rich part of the ocean extending from the low-tide mark to the edge of the continental shelf, typically reaching depths of up to 200 meters |
| Biogeography | the scientific study of the distribution of species, organisms, and ecosystems in geographic space and through geological time |
| Continental drift | the scientific theory that Earth's continents move gradually relative to each other over geologic time, riding on tectonic plates across the mantle |
| Dispersal | the movement, spread, or transport of organisms (animals, plants, fungi, or spores) away from their birth site, parent organism, or existing population to a new area |
| Exotic species | a plant or animal intentionally or accidentally introduced by humans into an ecosystem outside its native, historical range |
| Point source | a single, identifiable, and localized origin of radiation, energy, or pollution, which can be treated as having no spatial extension (a single, dimensionless point) for modeling or measurement purposes |
| Nonpoint source | contamination that does not originate from a single, discrete source (like a pipe), but rather from diffuse, widespread runoff—such as rain or snowmelt—picking up pollutants from the land and depositing them into water bodies |
| Biodegradable | materials capable of being broken down and decomposed by microorganisms—such as bacteria, fungi, or algae—into natural, simple compounds like carbon dioxide, water, and biomass over time. |
| Natural resource | materials, substances, and energy sources occurring in nature without human intervention, which are utilized for economic, industrial, or survival needs. |
| Soil conservation | the scientific management and application of, and agricultural practices designed to prevent soil degradation, erosion, and fertility loss. |
| Crop rotation | the systematic, sequential planting of different crop species in the same area over successive growing seasons, rather than cultivating the same crop continuously |
| Contour plowing | plowing, planting, and cultivating across a slope along its natural elevation contour lines, rather than up and down |
| Conservation plowing | a scientifically managed agricultural system that leaves at least 30% of the soil surface covered with crop residue—such as corn stalks or wheat stubble—after planting |
| Biodiversity | the variety and variability of all living organisms on Earth, including ecosystems, species, and genetic diversity. |
| Keystone species | an organism that has a disproportionately large effect on its ecosystem relative to its low population size or biomass. |
| Endangered species | a population of organisms—animals, plants, or other living things—at very high risk of becoming extinct (disappearing forever) in the wild, often because their habitat is shrinking or their numbers have dropped drastically. |
| Threatened species | any plant, animal, or organism likely to become endangered within the foreseeable future throughout all or a significant portion of its range |
| Extinction | the permanent disappearance of a species, subspecies, or group of organisms, occurring when the last individual member dies |
| Habitat destruction | the process by which natural, functional ecosystems are altered or eliminated to the point where they can no longer support their native species |
| Habitat fragmentation | the process where large, continuous habitats are broken into smaller, isolated patches, primarily caused by human activities like development, agriculture, and road construction |
| Poaching | the illegal hunting, capturing, or harvesting of wild animals and plants in violation of local, national, or international conservation laws |
| Captive breeding | the scientific process of breeding threatened or endangered species in controlled environments—such as zoos, aquariums, and conservation centers—to increase population numbers, maintain genetic diversity, and prevent extinction |
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