BIOL 3300 Lecture Notes - Reciprocal Altruism, Haplodiploidy, Alpheidae
Document Summary
Vampire bats (feb. 10th lecture: donor has a high cost, recipient will benefit from the donor, donor that gave up 5% of body weight is then picked up by the recipient. The donor gives up weight and becomes 6hrs closer to starvation. The recipient picks up this weight and becomes 16hrs farther from starvation. For selection to result in reciprocal altruism: cost to donor benefit to recipient, recipients that don"t reciprocate are punished (no cheating is allowed) Likely to evolve when: stable groups, multiple opportunities, individual remembers donor"s behavior, altruism is bidirectional. One can"t always be the donor and one can"t always be the recipient. Social system with: co-operative care of young, reproductive division of labor, over-lapping generations. Need it so the behavior can be taught to the next generation. Common in insects, also found in snapping shrimp and naked mole rats. Hamilton proposed haplodiploid systems are predisposed to eusociality: haplodiploid some are diploid, some are haploid.
