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

Smith, Henrik LU ; Wennerberg, Liv LU and von Schantz, Torbjörn LU (1996) In Behavioral Ecology and Sociobiology 38(3). p.191-197
Abstract
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.... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
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
in
Behavioral Ecology and Sociobiology
volume
38
issue
3
pages
191 - 197
publisher
Springer
external identifiers
  • scopus:0029659270
ISSN
1432-0762
DOI
10.1007/s002650050232
language
English
LU publication?
yes
id
fcf54071-479c-4be6-91ac-74cc7ab1aec1 (old id 1747735)
alternative location
http://www.jstor.org/stable/4601190
date added to LUP
2011-02-22 12:15:48
date last changed
2017-01-01 06:37:36
@article{fcf54071-479c-4be6-91ac-74cc7ab1aec1,
  abstract     = {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.},
  author       = {Smith, Henrik and Wennerberg, Liv and von Schantz, Torbjörn},
  issn         = {1432-0762},
  keyword      = {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},
  language     = {eng},
  number       = {3},
  pages        = {191--197},
  publisher    = {Springer},
  series       = {Behavioral Ecology and Sociobiology},
  title        = {Adoption or infanticide: Options of replacement males in the European starling},
  url          = {http://dx.doi.org/10.1007/s002650050232},
  volume       = {38},
  year         = {1996},
}