Compensating for the costs of polygyny in hen harriers Circus cyaneus

Stephen Redpath, Fiona M. Leckie, Beatriz Arroyo, Arjun Amar, Simon J. Thirgood

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In polygynous species, the adults are faced with a dilemma during chick rearing. Males must decide how to distribute food between their females and food allocation patterns are often highly unequal. In turn, the females that receive less food from males have to decide how much time to invest in additional hunting. If they spend more time hunting, then they leave their young exposed to weather and predators. However, if they stay at the nest, they increase the risk of their chicks starving. One way that birds may compensate for reduced provisioning is by increasing the size of prey caught. We tested this hypothesis by comparing prey deliveries to nests of hen harriers, Circus cyaneus, with females of different breeding status. As expected, male harriers delivered less food items to the nests of polygynous females, and especially their secondary, or beta females. However, both sexes were able to compensate by delivering larger items and there was no difference in the overall mass of food delivered to nests. Moreover, females spent a similar amount of time at the nest, irrespective of status, and there were no overall differences in breeding success. Our results show that polygynous female harriers can compensate for the costs of polygyny, but we suggest that their ability to do so will vary according to the abundance of both large prey and predators.

Original languageEnglish
Pages (from-to)386-391
Number of pages6
JournalBehavioral Ecology and Sociobiology
Volume60
Issue number3
DOIs
Publication statusPublished - Jul 2006

Keywords

  • polygyny
  • provisioning
  • parental care
  • harriers
  • Circus cyaneus
  • male parental cae
  • flycatcher
  • Red winged blackbirds
  • reproductive success
  • Agelaius phoeniceus
  • northern harriers
  • nestlings
  • prey
  • conflict
  • polygamy
  • Ficedula hypoleuca

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