Reversed Sexual Size Dimorphism and Parental Care: Minimal Division of Labour in the Blue-Footed Booby

  title={Reversed Sexual Size Dimorphism and Parental Care: Minimal Division of Labour in the Blue-Footed Booby},
  author={M de D Guerra and Hugh Drummond},
Reversed sexual size dimorphism in avian species (females larger than males) may be an adaptive consequence of different roles of males and females in parental care. We examined the alleged division of labour in two-chick broods of the blue-footed booby, using behavioural observation and frequent weighing of chicks. In the first week of parental care, males and females fed broods at similar frequencies and provided similar masses of food, but females brooded more than males when broods were 5… 
Reversed sexual size dimorphism and parental care in the Red‐footed Booby Sula sula
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Female-biased mortality in nestlings of a bird with size dimorphism
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Sex-specific foraging behaviour in a seabird with reversed sexual dimorphism: the red-footed booby
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Does large size make daughters of the blue‐footed booby more expensive than sons?
No evidence that daughters of the blue-footed booby receive a greater feeding expenditure than sons was found, which might explain why they grow more slowly than females with the same food budget.
Occasional inter-sex differences in diet and foraging behavior of the Blue-footed Booby: maximizing chick rearing in a variable environment?
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Relationship between reversed sexual dimorphism, breeding investment and foraging ecology in a pelagic seabird, the masked booby
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Offspring growth and parental care in sexually dimorphic Nazca boobies (Sula granti)
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Testing the feeding-niche partitioning hypothesis in the sexually dimorphic blue-footed booby
The feeding-niche partitioning hypothesis predicts that sexual size dimorphism in birds evolved as a result of disruptive selection between sexes to avoid food competition on breeding Blue-footed Boobies on Isla Lobos de Tierra, Peru, where females are 31% heavier than males.
Parental investment, adult sex ratios, and sexual selection in a socially monogamous seabird
Data is presented on the extent of male sexually dimorphic plumage, adult sex ratios and breeding season synchrony in three populations of a socially monogamous seabird, the brown booby Sula leucogaster, to suggest that on San Pedro Mártir, a period of obligate biparental care coupled with a relatively synchronous breeding season constrained the ability of males to take advantage of a high environmental polygamy potential.
The individual counts: within sex differences in foraging strategies are as important as sex-specific differences in masked boobies Sula dactylatra
The findings underline the importance of accounting for the effects of body mass differences within the same sex, if sex-specific foraging parameters in dimorphic species are being investigated.


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These observations contradict the prevailing hypothesis that in sexually dimorphic birds that practice siblicidal brood reduction the smaller sex suffers differential mortality as the result of its disadvantage in sibling conflict in mixed-sex broods.
Evolution of reversed sexual size dimorphism and role partitioning among predatory birds, with a size scaling of flight performance
To explain the adaptive significance of sex role partitioning and reversed sexual size dimorphism among raptors, owls and skuas, where females are usually larger than males, we combine several
Adaptive advantages of reversed sexual size dimorphism in European owls
A new hypothesis for sex dimorphism in terms of mass is advanced, namely that females are larger because larger bodies take longer to starve and can stand lower ambient temperatures without increasing heat production.
Factors Influencing Sexual Size Dimorphism in Temperate Waterstriders
  • D. Fairbairn
  • Biology, Environmental Science
    The American Naturalist
  • 1990
Sexual size ratios (mean female length divided by mean male length) of 12 species of temperate waterstriders in the subfamily Gerrinae (Hemiptera, Gerridae) are analyzed to test both potentially
Sexual Dimorphism and Food Habits in Three North American Accipiters
Although the females of all three species average larger than the males, the sexual difference in size was greatest in the smallest species, the Sharp-shinned Hawk, and least in the largestspecies, the Goshawk.
The Evolution of Reversed Sexual Dimorphism in Size
The comparative method appears to be simultaneously the best and easiest method of testing these hypotheses on reversed sexual dimorphism.
A review of possible explanations for reverse size dimorphism of American woodcock
It is speculated that selection pressure on males for early arrival and acquisition of territories also influences their small size, and three hypotheses used to explain dimorphism in American woodcock are examined.
The Evolution of Normal and Reverse Sexual Size Dimorphism in Shorebirds and other Birds
The shorebirds (Charadriiformes: suborders Charadrii and Scolopaci) seem an ideal group for evaluating the role of natural and sexual selection in the evolution of sexual size dimorphism. Shorebirds
Brood Size and Food Provisioning in Masked and Blue‐Footed Boobies (Sula Spp.)
Compared with typical pelagic seabirds, Masked and Blue-footed Boobies have similar capacities to provision two-chick broods; some other factor limits MaskedBoobies, but not Blue-footers, to fledging single chicks.