29_BehaviorEcols_2010_forupload

29_BehaviorEcols_2010_forupload - Phylogenetic trees...

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Unformatted text preview: Phylogenetic trees Phylogenetic trees Phylogenetic trees The molecular clock is a yardstick for measuring absolute time of evolutionary change based on the observation that some genes and other regions of genomes seem to evolve at constant rates, ticking like a clock Molecular Clocks Molecular Clocks Chapter 51 Behavioral Ecology What Is Behavior? Behavior is what an animal does and how it does it Behavior includes muscular and nonmuscular activity What do behavioral ecologists study? BEHAVIOR: A male stickleback fish attacks other male sticklebacks that invade its nesting territory. PROXIMATE CAUSE: The red belly of the intruding male acts as a sign stimulus that releases aggression in a male stickleback. ULTIMATE CAUSE: By chasing away other male sticklebacks, a male decreases the chance that eggs laid in his nesting territory will be fertilized by another male. Behavioral traits can evolve by natural selection bee waggle dance Behavioral traits can evolve by natural selection Behavioral traits can evolve by natural selection Because genes influence behavior, natural selection can result in evolution of behavioral traits in populations Behaviors evolve because they have costs and benefits For example, cost-benefit analysis of feeding...
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29_BehaviorEcols_2010_forupload - Phylogenetic trees...

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