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Ecology
Unit 11: Classification & Ecology
| Term | Definition |
|---|---|
| producer | An organism that makes it own food. Also known as an autotroph. |
| consumer | An organism that has to eat or absorb other living things to get food. Also known as a heterotroph. |
| heterotroph | An organism that has to eat or absorb other living things to get food. Also known as a consumer. |
| herbivore | An organism that only consumes plants. |
| carnivore | An organism that only consumes meat. |
| omnivore | An organism that consumes both plants and meat. |
| photosynthesis | A process of using light energy (sunlight) to make food (sugars) in chloroplast. |
| scavenger | An animal that feeds on carrion (dead animals), dead plant material, or refuse (garbage). |
| decomposer | Organisms that break down dead plant or animal matter for nutrients. Example: fungi |
| food chain | Simple model that shows how matter and energy move through an ecosystem. |
| food web | A model that shows all the possible feeding relationships at each trophic level in a community. |
| trophic level | Organisms that represent a feeding step in the movement of energy and materials through an ecosystem. |
| ecosystem | Interactions among populations in a community |
| primary consumer | An organism that feeds on producers/plants. Example: herbivores |
| secondary consumer | An organism that feeds on plant-eating (herbivore) organisms. |
| tertiary consumer | A carnivore or omnivore at the topmost level of the a food chain/food web that fees on other carnivores/secondary consumers. |
| ecological pyramid | A graphical representation designed to show the biomass or biomass productivity at each trophic level in an ecosystem. |
| autotroph | An organism that makes it own food through the process of photosynthesis. |
| heterotroph | An organism that has to eat or absorb other living things to get food. These organisms must participate in cellular respiration to unlock the stored energy in the food they consume. |
| Succession | The process in which communities in ecosystems are replaced by newer communities. |
| Primary Succession | Succession that occurs in an area where no communities already existed. |
| Secondary Succession | Succession that takes place in an area where organisms previously lived |
| Pioneer Species | The fist species to live in an area. This is usually lichens or mosses. |
| Lichens | An example of a pioneer species. |
| Climax Community | The final community that results from succession. This is usually a diverse and stable, and will remain in place until another disturbance occurs. |
| Examples of disturbance that leads to succession | forest fire, volcanic eruption, farming, clear-cutting, filling in wetlands, floods. |
| Dichotomous Key | A tool used to identify organisms. |