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Animal Behavi35 - other behaviors need to be regulated over...

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Animal Behavior: Orientation and Navigation Terms Endogenous - This general term refers to factors within a given organism rather than those external to that organism. Compare with Exogenous. Exogenous - This general term refers to factors external to a given organism rather than those within that organism. Compare with Endogenous. Kinesis - Random, undirected movement. Compare with Taxis. Taxis - Movement whose direction is determined in relation to a stimulus. Compare with Kinesis. Zeitgeber - An environmental agent (such as light or temperature) that entrains an individual's behavior to that environment. Zeitgeber is German for "time-giver." Circannual and Lunar Rhythms While behaviors such as pupal emergence, sleep, and activity must be regulated on a daily basis,
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Unformatted text preview: other behaviors need to be regulated over longer periods of time. For example, mating in marine organisms is often linked to stages of the tides. In the paolo worm, mating occurs in the neap tides during the last quarter moon of October in November. These worms are very vulnerable during mating, so by synchronizing their mating behavior to an exogenous factor such as tides, they can outnumber predators and increase the probability that some mating will be successful. This circannual mating rhythm provides the paolo worm with increased chances of survival: it makes both individuals and the species more fit. In other words, the rhythm is selected for by natural selection, and thereby evolves into a common species trait....
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