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Stress and the suppression of subordinate reproduction in cooperatively breeding meerkats
TLDR
This work provides strong support for the stress-related suppression hypothesis in a cooperative mammal, the meerkat, and suggests that dominant female meerkats employ stressful evictions to suppress reproduction among their probable competitors, when attempting to breed themselves.
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Fitness benefits of prolonged post-reproductive lifespan in women
TLDR
It is shown that women with a prolonged post-reproductive lifespan have more grandchildren, and hence greater fitness, in pre-modern populations of both Finns and Canadians, and that rates of female mortality accelerate as their offspring terminate reproduction.
View on Nature
Integrating cooperative breeding into theoretical concepts of cooperation
View on Elsevier
Effects of Helpers on Juvenile Development and Survival in Meerkats
TLDR
It is shown that in wild groups of cooperative meerkats, Suricata suricatta, reductions in the ratio of helpers to pups depress the daily weight gain and growth of pups and thedaily weight gain of helpers.
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Intrasexual competition and sexual selection in cooperative mammals
TLDR
It is shown that females gain greater benefits from acquiring dominant status than males and traits that increase competitive ability exert a stronger influence on their breeding success, and the extent to which competition for breeding opportunities between females can affect the evolution of sex differences and the operation of sexual selection.
View on Nature
Evolution and Development of Sex Differences in Cooperative Behavior in Meerkats
TLDR
It is shown that female meerkat helpers contribute more to rearing young than males and that female helpers feed female pups more frequently than males, which support the view that direct, mutualistic benefits are important in the evolution of specialized cooperative behavior.
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Correlations between ultraviolet coloration, overwinter survival and offspring sex ratio in the blue tit
TLDR
The correlations that are found are consistent with models of adaptive sex ratio adjustment in response to mate quality, but careful experimental work is required to provide tests of the assumptions of these models, and should be a priority for future work.
View on Wiley
Egg investment is influenced by male attractiveness in the mallard
TLDR
It is shown that individual female mallard (Anas platyrhynchos) lay larger eggs after copulating with preferred males and smaller eggs afterCopulating with less preferred males, showing that differences between half-sibs cannot always be attributed to paternal or maternal genetic effects.
View on Nature
Experimental evidence for kin-biased helping in a cooperatively breeding vertebrate
TLDR
Strong evidence is provided that kinship plays an essential role in the maintenance of cooperative breeding in this species and, when given a choice between helping equidistant broods belonging to kin and non–kin within the same social unit, virtually all helped at the nest of kin.
View on Royal Society
Reduced Egg Investment Can Conceal Helper Effects in Cooperatively Breeding Birds
TLDR
It is suggested that failure to consider maternal egg-investment strategies can lead to underestimation of the force of selection acting on helping in avian cooperative breeders.
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