Sexual Selection and Sex Ratios in Anolis Lizards
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چکیده
منابع مشابه
Postcopulatory fertilization bias as a form of cryptic sexual selection.
Males and females share most of their genetic material yet often experience very different selection pressures. Some traits that are adaptive when expressed in males may therefore be maladaptive when expressed in females. Recent studies demonstrating negative correlations in fitness between parents and their opposite-sex progeny suggest that natural selection may favor a reduction in trait corr...
متن کاملThe oestrogen pathway underlies the evolution of exaggerated male cranial shapes in Anolis lizards.
Sexual dimorphisms vary widely among species. This variation must arise through sex-specific evolutionary modifications to developmental processes. Anolis lizards vary extensively in their expression of cranial dimorphism. Compared with other Anolis species, members of the carolinensis clade have evolved relatively high levels of cranial dimorphism; males of this clade have exceptionally long f...
متن کاملField estimates of parentage reveal sexually antagonistic selection on body size in a population of Anolis lizards
Sexual dimorphism evolves when selection favors different phenotypic optima between the sexes. Such sexually antagonistic selection creates intralocus sexual conflict when traits are genetically correlated between the sexes and have sex-specific optima. Brown anoles are highly sexually dimorphic: Males are on average 30% longer than females and 150% heavier in our study population. Viability se...
متن کاملThe role of heritable and dietary factors in the sexual signal of a Hispaniolan Anolis lizard, Anolis distichus.
The diversity of sexual signals is astounding, and divergence in these traits is believed to be associated with the early stages of speciation. An increasing number of studies also suggest a role for natural selection in driving signal divergence for effective transmission in heterogeneous environments. Both speciation and adaptive divergence, however, are contingent on the sexual signal being ...
متن کاملReproducing lizards modify sex allocation in response to operational sex ratios.
Sex-allocation theory suggests that selection may favour maternal skewing of offspring sex ratios if the fitness return from producing a son differs from that for producing a daughter. The operational sex ratio (OSR) may provide information about this potential fitness differential. Previous studies have reached conflicting conclusions about whether or not OSR influences sex allocation in vivip...
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تاریخ انتشار 2017