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| Any behavior that has a fitness cost to the individual (lowered survival and/or reproduction) and a fitness benefit to the recipient. SeeĀ reciprocal altruism. |
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| Any action by an organism, often in response to a stimulus. |
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| The study of how organisms respond to particular abiotic and biotic stimuli from their environment. |
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| Highly stereotyped behavior pattern that occurs in a certain invariant way in a certain species. A form of innate behavior. |
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| The combination of (1) direct production of offspring (direct fitness) and (2) extra production of offspring by relatives in response to help provided by the individual in question (indirect fitness). |
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| Behavior that is inherited genetically, does not have to be learned, and is typical of a species. |
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| A form of natural selection that favors traits that increase survival or reproduction of an individual's kin at the expense of the individual. |
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| (1) In ecology, a seasonal movement of large numbers of organisms from one geographic location or habitat to another. (2) In population genetics, movement of individuals from one population to another. |
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| The concept that animals forage in a way that maximizes the amount of usable energy they take in, given the costs of finding and ingesting their food and the risk of being eaten while they're at it. |
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| Altruistic behavior that is exchanged between a pair of individuals at different times (i.e., sometimes individual A helps individual B, and sometimes B helps A). |
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