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Adoption or infanticide: Options of replacement males in the European starling

Author:
  • Henrik Smith
  • Liv Wennerberg
  • Torbjörn von Schantz
Publishing year: 1996
Language: English
Pages: 191-197
Publication/Series: Behavioral Ecology and Sociobiology
Volume: 38
Issue: 3
Document type: Journal article
Publisher: Springer

Abstract english

The behaviour of a male bird towards a potential mate and her clutch may depend both on his expected paternity and on the likelihood that she will produce a replacement clutch if he commits infanticide. In this study we evaluate the choices made by replacement male European starlings Sturnus vulgaris. By removing males before and during laying, we induced other males, mainly neighbours, to mate with the reproductively active females. When the original male was removed before laying, a new male adopted the subsequent clutch in 14 out of 15 cases. When ten females were widowed during their laying period, replacement males never adopted their clutches. The paternity of replacement males was a function of when they replaced the former male. When replacement occurred more than 3 days before egglaying, the new male fathered nearly all offspring; when it occurred the day before laying, the new male still fathered more than every second young. When the original male was removed during his mate's laying period, in five out of ten cases a replacement male committed infanticide by throwing out the eggs, but this only occurred in one out of 15 cases when removal took place before laying. The evidence for infanticide actually being committed by the replacement male was circumstantial. Four out of six of the females affected by apparent infanticide produced replacement clutches in which the male presumably had higher paternity than in the original clutch. In all cases, the male adopted the replacement clutch. In five cases when the original male was removed during laying, the neighbours neither adopted the brood nor committed infanticide, although they sometimes were seen courting the widowed female and copulating with her. These cases occurred later during laying than those were males comitted infanticide. The time from infanticide to the laying of the replacement clutch tended to increase as infanticide was committed later in the laying sequence. We conclude that strategies of potential replacement males are influenced by their expected paternity in the current brood and the probability that the female will produce an early replacement clutch.

Keywords

  • Biological Sciences
  • Ecology
  • females
  • tree swallows
  • hirundo-rustica
  • sturnus-vulgaris
  • tropical house wrens
  • extra-pair paternity
  • dunnocks prunella-modularis
  • parental care
  • male
  • sexually selected infanticide
  • intraspecific brood parasitism
  • male investment
  • paternity
  • Sturnus vulgaris
  • adoption
  • infanticide

Other

Published
  • Molecular Ecology and Evolution Lab
  • ISSN: 1432-0762
Henrik Smith
E-mail: henrik [dot] smith [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

E-C313

50

Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

+46 70 978 20 56

C313

Sölvegatan 37, Lund

50

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden