Lecture 21 behavior posted revised fall 2009

Lecture 21 behavior posted revised fall 2009 - A A 1 A 2 A...

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BIO 311D LECTURE 321 Behavior
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What is behavior? What animals do and how and why they do it – communication and response. Can be species specific, individual specific, or developmentally specific. Two kinds – Two questions –
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Innate (instinctual) behaviors Examples Web-weaving in spiders Begging for food in chicks (pecking at high contrast “bill” in herring gulls) Chick “crouching” in many ground-nesting birds Imprinting on “parent” at hatching (Smiling and contagious yawning in humans)
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Imprinting
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Learned behaviors Chicks do not crouch Chicks crouch
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Social learning: Song acquisition in white-crowned sparrows
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Cognition
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Behavioral ecology Interactions - of individuals, within groups Altruism Reciprocal altruism Parent-offspring conflict
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Interactions between individuals
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Hamilton’s Rule rB – C > 0 Relatedness Using the above pedigree, we can calculate the relatedness between an A 0 A 2 offspring and a random sibling:
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Unformatted text preview: A A 1 A 2 A 3 A A 2 A A 3 A 1 A 2 A 1 A 3 A A 2 1 A A 3 1/2 A 1 A 2 1/2 A 1 A 3 The average relatedness between siblings is 1/2 Relatedness Values Sibling - sibling = 1/2 Half-siblings (one parent shared) = 1/4 Parent - offspring = 1/2 Uncle/aunt - nephew/niece = 1/4 First cousins = 1/8 Altruism and kin selection Bird study – Usually in territory areas that are full – Usually the helpers are older offspring of the parents being helped – sometimes siblings. – So, this is kin selection, too. Only when necessary, though. Also, advantageous to the helpers if they stay in the area. “Helping” Reciprocal altruism Return effects • Natural selection can lead to altruism between non-related individuals. • We are a good example • Requires: – Opportunity – Repeated contacts – Recognition Vampire bat example...
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This note was uploaded on 03/06/2010 for the course BIOL 50755 taught by Professor Allgeier during the Spring '10 term at University of Texas-Tyler.

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Lecture 21 behavior posted revised fall 2009 - A A 1 A 2 A...

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