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Definition
| the study of how organisms interact with one another and their environments. |
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Definition
| a group of individuals that interbreed and produce fertile offspring. |
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Definition
| the members of a species that live in the same area. |
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Definition
| all of the population in a particular area. |
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Definition
| all living things and their physical environments within a particular area. |
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Definition
| the Earth and all of its organisms and environments. |
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Definition
| any part of an ecosystem that is living |
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Definition
| the specific environment in which an organism lives. |
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Definition
| anything an organism needs; includes nutrition, shelter, mates, and breeding sites. |
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Definition
| the number of individual organisms present in a population at a given time. |
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Definition
| the number of individuals in a population per unit of area. |
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Definition
| how organisms are arranged within an area; sometimes called population dispersion. |
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Term
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Definition
| the relative number of organisms of each age within a population; also called age distribution. |
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Term
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Definition
| a chat that shows the age distribution of a population; also called age pyramid. |
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Definition
| the proportion of males to females in a population. |
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Definition
| a graph showing the likelihood of survival within a group or population by age. |
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Term
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Definition
| the arrival of individuals from outside a given area. |
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Term
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Definition
| the movement of individuals away from a given area. |
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Term
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Definition
| the seasonal movement of organisms into and out of an area. |
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Term
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Definition
| the pattern of population growth in which a population increases by a fixed percentage each year. |
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Term
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Definition
| a characteristic of the environment that restricts population growth. |
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Definition
| the largest population a given environment can support. |
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Term
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Definition
| the pattern of population growth in which exponential growth is slowed and finally stopped by limiting factors. |
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Term
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Definition
| a limiting factor whose influence changes with population density; includes competition, predation, and disease. |
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Term
| density-independent factor |
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Definition
| a limiting factor whose influence is not affected by population density; includes catastrophic events. |
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Term
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Definition
| the growth rate of a population under ideal conditions. |
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Term
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Definition
| any part of an ecosystem that has never been living. |
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