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Kin Selection vs Group Augmentation

Biio 425 - Discussion 2

Danielle Hinckley

on 28 March 2013

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Transcript of Kin Selection vs Group Augmentation

Kin selection, not group augmentation, predicts helping in an obligate cooperatively breeding bird Kin-Selection= a form of natural selection that favors altruistic behavior toward close relatives resulting in an increase in the altruistic individual's genetic contribution to the next generation. Group Augmentation= when animals living in a group behave so as to increase the group's size Chesnut-Crowned Babbler (Pomatostomus ruficeps) obligate cooperative breeding bird
makes this a model bird for this study
resides in the southeastern regions of Australia Group Augmentation Hypothesis Group Members Should...
i. decide whether to help based on their ability to increase future group size
ii. given a choice, choose to help at the nest where they can have the greatest impact
iii. show significant reductions in their contributions to cooperation with increasing group size (benefits decrease) Kin Selection Group Members Should...
i. decide whether to help based on relatedness to breeders
ii. given a choice, choose those breeders to which they are most related
iii. contribute more to rearing kin than non-kin Reasons to support Kin selection no dominant role of group augmentation on individual decisions
no secondary effect of group augmentation on helper decisions Group Augmentation Hypothesis Kin Selection What did they investigate? What did they investigate? i. the function of the relationship between breeding unit size and productivity
ii. test the causality of any such relationship using a brood size manipulation
iii. use the results to generate predictions of whether and where non-breeding babblers should help if group augmentation explains such decisions # of helpers related immigrants no relatedness ***helpers choosing are all equally related to the offspring If group augmentation has a dominant effect we would expect... If group augmentation has a dominant effect we would expect.... i. immigrant and natal individuals will both be as likely to help
ii. they will be more likely to help when units of fewer than 8 individuals exist
iii. given the choice of helping non-kin with fewer than 8 or kin with greater they will still choose the smaller group If group augmentation has a secondary effect... If group augmentation has a secondary effect... i. helpers should choose the group with fewer than 8 when relatedness to all offspring is equivalent Closing Question... Can this conclusion be crossed over into eusocial organisms???
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