Sociality, age at first reproduction and senescence: comparative analyses of birds
نویسندگان
چکیده
منابع مشابه
Senescence and age-related reproduction of female Columbian ground squirrels
1. Three hypotheses have been proposed to explain age-structured patterns of reproductive investment and somatic investment: residual reproductive value, senescence and evolutionary restraint. We evaluated these hypotheses for female Columbian ground squirrels ( Spermophilus columbianus ) by examining age-related patterns of somatic and reproductive investment. Females were designated as succes...
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Life-history theory predicts that traits involved in maturity, reproduction and survival correlate along a fast-slow continuum of life histories. Evolutionary theories and empirical results indicate that senescence-related traits vary along this continuum, with slow species senescing later and at a slower pace than fast species. Because senescence patterns are typically difficult to estimate fr...
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Unlike nonhuman primates, thousands of bird species have articulatory capabilities that equal or surpass those of humans, and they develop their vocalizations through vocal imitation in a way that is very similar to how human infants learn to speak. An understanding of how speech mechanisms have evolved is therefore unlikely to yield key insights into how the human brain is special.
متن کاملQuantitative genetics of age at reproduction in wild swans: support for antagonistic pleiotropy models of senescence.
Why do individuals stop reproducing after a certain age, and how is this age determined? The antagonistic pleiotropy theory for the evolution of senescence predicts that increased early-life performance should be accompanied by earlier (or faster) senescence. Hence, an individual that has started to breed early should also lose its reproductive capacities early. We investigate here the relation...
متن کاملFirst- and second-order sociality determine survival and reproduction in cooperative cichlids.
Cooperative breeders serve as a model to study the evolution of cooperation, where costs and benefits of helping are typically scrutinized at the level of group membership. However, cooperation is often observed in multi-level social organizations involving interactions among individuals at various levels. Here, we argue that a full understanding of the adaptive value of cooperation and the evo...
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ژورنال
عنوان ژورنال: Journal of Evolutionary Biology
سال: 2006
ISSN: 1010-061X,1420-9101
DOI: 10.1111/j.1420-9101.2005.01065.x