PSYC 3280 Chapter Notes - Chapter 5: Black-Headed Gull, Divergent Evolution, Convergent Evolution
4 Feb 2018
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Document Summary
Fitness costs how well a species can reproduce in its environment; if they are no longer reproducing then they are no longer evolutionary fit. Fitness benefits positive effects of a trait on reproductive success. Mobbing is an adaptation that helps black headed gulls protect their young and eggs. Comparative method using comparisons across species that have evolved independently, is an effective means for studying historical and physical constraints. Can test predictions about which other species should have evolved the trait under investigation and which should not. Divergent evolution - differences between groups which can lead to the formation of new species. Diffusion of the same species to different and isolated environments which blocks the gene flowallowing different characteristics. Convergent evolution - different species living in the same environment can inherit the same traits due to living around the same pressures. Selfish herd - spreading out to avoid prey.
