BIOC54H3 Lecture Notes - Marine Iguana, Nuptial Gift, Satin Bowerbird

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redeagle983

8 Oct 2012

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Collects blue rubber ands and blue parrot feathers there. When female comes, he chortles and squeaks with a courtship dance while opening and closing his wings with a buzzing trill. He may also bob up and down while imitating the songs of several species of other birds. After the first round, female takes a break of a week to construct a nest before returning to a. Female satin bowerbirds visit several bowers but not to mate on these inspections number of bowers where she observes the full courtship routine of several males. These inspections take several weeks before female settles to one male: she enters the males bower and she is courted again after which is gets copulated. She flies out after and will not have contact with her partner and will incubate and rear young by herself. Mate will stay at his bower and copulate with other females.

Related Questions

a) Why might selection have favored the preference female sage grouse have for the male sage grouse mating display? That is, what might males be signaling with this behavior, and why might it be in a femaleâs interest to choose a male based on his display?

b) What is the name of the mating system exhibited by great crested grebes, and what may have been one selective factor explaining why it evolved?

C) Propose a different hypothesis for why selection might have favored the preference female bowerbirds exhibit for blue coloration. (Isn't the reason why bowerbirds prefer the blue coloration is because it may be similar in color as to one of their resources attracting female bowerbirds to mate with them?)

- can someone also check if my answer to this question is correct (letter d).

d) Propose a hypothesis for why selection might have favored the preference females have for bower-building in male satin bowerbirds? That is, what might males be signaling with this behavior, and why might it be in a femaleâs interest to choose a male based on his display?

Bower building males signal females that their nest is the most suitable to lay their eggs and reproduce. It would be in the females best interest to choose a bowerbird with the best bower build because it is a preference that has been passed on in the species and by doing so its offspring will also choose intricate bower building mates.

lemoncheetah578

The gray mouse lemur is a species in which females come into estrus and mate with several males on one night each year. Females accept any and all partners, but a genetic analysis of offspring produced by female gray mouse lemurs indicates that mothers and actual fathers differed with respect to their MHC genes to a greater degree than mothers and males selected at random from the population. Use these results to evaluate the various hypotheses on the indirect genetic benefits of polyandry. What do they suggest about the mechanism that enables a sexually promiscuous female mammal to exercise mate choice?

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Males of the moth Cosmosoma myrodora (Arctiidae) acquire pyrrolizidine alkaloid by feeding on the excrescent fluids of certain plants (for instance, Eupatorium capillifolium). They incorporate the alkaloid systemically and as a result are protected against spiders. The males have a pair of abdominal pouches, densely packed with fine cuticular filaments, which in alkaloid-fed males are alkaloid laden. The males discharge the filaments on the female in bursts during courtship, embellishing her with alkaloid as a result. The topical investiture protects the female against spiders. Alkaloid-free filaments, from alkaloid-deprived males, convey no such protection. The males also transmit alkaloid to the female by seminal infusion. The systemic alkaloid thus received, which itself may contribute to the female's defense against spiders, is bestowed in part by the female on the eggs. Although paternal contribution to egg defense had previously been demonstrated for several arctiid moths, protective nuptial festooning of a female by its mate, such as is practiced by C. myrodora, appears to be without parallel among insects. What is the null hypothesis and alternative hypothesis from this paragraph?

BIOC54H3 Lecture Notes - Marine Iguana, Nuptial Gift, Satin Bowerbird

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