| A | B |
|---|
| biotic factors | biological influences on organisms within an ecosystem (including all the characters with which an organism interacts--the ecological community. (90) |
| abiotic factors | The physical, or nonliving, factors that shape ecosystems (i.e., temperature, precipitation, humidity, wind, nutrient availability, soil type, sunlight.) |
| habitat | the area in which an organism lives, including both biotic and abiotic factors |
| niche | the full range of physical and biological conditions in which an organism lives & the way in which the organism uses those conditions |
| community interactions | A community is an assemblage of different populations that live together in a defined area; the interaction between these communities include competition, predation, and various forms of symbiosis. |
| competitive exclusion principle | No 2 species can occupy the same niche in the same habitat at the same time. |
| predation | Interaction in which one organism captures and feeds on another organism. |
| symbiosis | A relationship inwhich two species live closely together (93). |
| mutualism | a symbiotic relationship in which both species benefit from the relationship |
| commensalism | a symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed. |
| parasitism | a symbiotic relationship in which one organism lives in or on another organism (the host) and consequently harms it |
| ecological succession | the gradual change in living communities that follows a disturbance (94) |
| primary succession | succession that occurs on surfaces where no soil exists |
| pioneer species | the first species to populate an area during primary succession |
| secondary succession | the succession following a disturbance that destroys a community without destroying the soil (95) |
| resource | any necessity of life, such as water, nutrients, light, food, or space |
| What 2 factors determine the survival & growth of organisms in an ecosystem? | biotic & abiotic factors |
| List 3 community interactions that affect an ecosystem. | competition, predation, symbiosis |
| If 2 organisms live in the same niche in the same habitat at the same time, what can you conclude about them? | They're members of the same species. |
