08 December 2009

Theories of Clutch Size

1) Reproduction adjusted to match mortality. This is GROUP SELECTION -- "you don't want to overpopulate. " It becomes a matter of altruism vs. cheaters. Cheaters should win and you can't predict birth rates.

2) David Lack: natural selection will favor those that have most young, therefore, the clutch size will tend to be as high as possible. Thus clutch size should be proportional to food availability.

Golden-crowned Kinglet

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