06 - BEHAVIORAL ECOLOGY

06 - BEHAVIORAL ECOLOGY - BEHAVIORAL ECOLOGY I. Proximate...

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BEHAVIORAL ECOLOGY I. Proximate vs. ultimate causes a. Proximate causes – immediate stimulus and mechanism for behavior (how) b. Ultimate causes – how behavior contributes to survival and reproduction (why) i. i.e. birds migrate north in spring 1. proximate cause – day length triggers hormones 2. ultimate cause – abundance of food in spring/summer at higher latitudes increases breeding success II. Sexual selection In many organisms, difference between sexes in traits not directly required for reproduction (size, look, behave) o Sexual dimorphism – traits often seem to reduce survival o Sexual selection – differential reproductive success due to variation among individuals in mating Variation for a trait, is heritable Differenctial success by phenotypes at getting mates Genetic change in population over time-evolution How can sexual selection explain sexually dimorphism? o Parental investment in reproduction o Anisogamy – gametes of each sexy are different sizes In most animal species, there are differences between sexes in parental investment in offspring What does differential parental cost/investment tell us about sexual selection acts? Bateman’s principle
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06 - BEHAVIORAL ECOLOGY - BEHAVIORAL ECOLOGY I. Proximate...

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