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LHS Set 1: Ecology
| Term | Definition |
|---|---|
| Ecology | Scientific study of all the interrelationships between organisms and their environment |
| Population | Group of organisms of the same species that occupy the same geographic place at the same time |
| Parasitism | Symbiotic relationship in which one organism benefits at the expense of another organism |
| Biome | Large group of ecosystems that share the same climate and have similar types of communities |
| Ecosystem | Biological community and all the nonliving factors that affect it |
| Niche | Role, or position, of an organism in its environment |
| Biosphere | Relatively thin layer of Earth and its atmosphere that supports life |
| Biotic | Referring to any living factor in an organism's environment |
| Abiotic | Referring to any nonliving factor in an organism's environment, such as soil, water temperature, and light availability |
| Community | Group of interacting populations that live in the same geographic area at the same time |
| Habitat | Physical area in which an organism lives |
| Predation | Act of one organism feeding on another organism |
| Symbiosis | Close mutualistic, parasitic, or commensal association between two or more species that live together |
| Mutualism | A symbiotic relationship in which both organisms benefit |
| Commensalism | Symbiotic relationship in which one organism benefits and the other is neither helped nor harmed |
| Producer | Organism that captures energy from sunlight or inorganic substances to produce its own food; also called an autotroph. |
| Consumer | Organism that cannot make its own food and gets its nutrients and energy requirements from other organisms; also called a heterotroph. |
| Decomposer | Organism that breaks down and obtains energy from dead organic matter |
| Trophic level | Each step in a food chain, food web, or energy pyramid |
| Food chain | Simplified model that shows a single path for energy flow through an ecosystem |
| Food web | Model that shows many interconnected food chains and pathways in which energy and matter flow through an ecosystem |
| Nitrogen fixation | Process in which nitrogen gas is captured and converted into a form plants can use |
| Denitrification | Process in which fixed nitrogen compounds are converted back into nitrogen gas and returned to the atmosphere |
| Limiting factor | Biotic or abiotic factor that restricts the number, distribution, or reproduction of a population within a community |
| Primary succession | Establishment of a community in an area of bare rock or bare sand, where no topsoil is present |
| Secondary succession | Orderly changes that occurs in a place where soil remains after a community of organisms has been removed. |
| Climate | Average weather conditions in a specific area, determined by latitude, elevation, ocean currents, and other factors. |
| Carrying capacity | Largest number of individuals in a species that an environment can support long-term |
| Biomagnification | The increase in chemical concentration in animal tissues as the chemical moves up the food chain |
| Pioneer species | The first species to populate an area |
| Keystone species | A species that influences the survival of many other species in an ecosystem, such that if it were removed the ecosystem would change drastically. |
Created by:
KES-HFHS
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