Anthro_L8

Anthro_L8 - Altruism Recap Social Living Kin Selection...

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2/25/11 11 Altruism • Recap • Social Living • Kin Selection • Reciprocal Altruism • Primate Groups
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2/25/11 22 Clicker Question
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2/25/11 33 Recap • Selective patterns are generally directional, stabilizing or disruptive. • Two methods of speciation are via the allopatric or parapatric models. • Species are organized into hierarchical taxa. • Cladistics groups organisms by decent. • Out-group comparison provides information about primitive and derived traits.
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2/25/11 44 Evolved Behavior
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2/25/11 55 Social Living • Many animals are social • Moreover, it seems that many social animals live relatively ‘peacefully’ together
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2/25/11 66 Social Living • Is it because a being peaceful is good for the species?
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2/25/11 77 Social Living • Genes are being selected, not species. • We need to know the costs and benefits of being social to understand why we sometimes see ‘peaceful’ relationships
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2/25/11 88 Social Living • Benefits of being social – More eyes to see predators – detection – Less chance of being singled out by a predator – dilution – More to attack – defence – Mates usually easy to find – More individuals to look for food – More individuals to defend food
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2/25/11 99 Social Living • Costs of being social – Larger groups more visible to predators – Social hierarchies produce subordinates – Increases in disease – Larger groups need more food – Increased competition for mates
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2/25/11 1010 Social Living • When to be social? When the benefits outweigh the costs. • Social animals are those that either
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Anthro_L8 - Altruism Recap Social Living Kin Selection...

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