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

@article{Guerra1995ReversedSS,
  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},
  journal={Behaviour},
  year={1995},
  volume={132},
  pages={479-496}
}
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… 
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The idea that blue-footed booby females are more vulnerable to food-related stress than males because of their larger size supports the idea that sex-biased mortality in this species is supported.
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TLDR
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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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