Patterns of paternal relatedness in British grey seal colonies

J.W. Wilmer, Andrew Overall, P.P. Pomeroy, S.D. Twiss, W. Amos

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Previous studies of breeding behaviour in the grey seal, Halichoerus grypus, have painted conflicting pictures. Behavioural observations suggest a classical polygynous system with a small number of dominant males fathering most of the offspring. However, genetic analysis suggests that many potential fathers spend little time ashore, that some pairs of seals show partner fidelity and that the dominant males are not as successful as their behaviour would suggest. Here we used paternal relatedness between pups with known mothers, sampled over an 11-year period, to show that behavioural dominance leading to enhanced fitness is a feature of only a handful of males located near the centre of the breeding colony. The vast majority of pups are fathered by any of a large number of males who all share approximately equal success, including virtually all those males who have previously escaped our best sampling efforts. As expected, the frequency of full-sibs is reduced in this longer time series relative to the original study. However, absolute estimates of the frequency of full-sibs seem to be confounded by a tendency for females who produce paternally unrelated pups to have conceived to males who are more genetically dissimilar from each other than expected by chance alone. Together, these elements of breeding behaviour would help to maintain maximum genetic diversity and to minimize the effects of inbreeding.
Original languageEnglish
Pages (from-to)283-292
Number of pages10
JournalMolecular Ecology
Volume9
Issue number3
Publication statusPublished - 31 Mar 2000

Fingerprint

seals
pups
breeding
Halichoerus grypus
social dominance
fathers
inbreeding
genetic techniques and protocols
time series analysis
genetic variation
sampling

Keywords

  • breeding behaviour
  • female mate choice
  • grey seal
  • microsatellite
  • paternal relatedness
  • polygyny

Cite this

Wilmer, J. W., Overall, A., Pomeroy, P. P., Twiss, S. D., & Amos, W. (2000). Patterns of paternal relatedness in British grey seal colonies. Molecular Ecology, 9(3), 283-292.
Wilmer, J.W. ; Overall, Andrew ; Pomeroy, P.P. ; Twiss, S.D. ; Amos, W. / Patterns of paternal relatedness in British grey seal colonies. In: Molecular Ecology. 2000 ; Vol. 9, No. 3. pp. 283-292.
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Wilmer, JW, Overall, A, Pomeroy, PP, Twiss, SD & Amos, W 2000, 'Patterns of paternal relatedness in British grey seal colonies', Molecular Ecology, vol. 9, no. 3, pp. 283-292.

Patterns of paternal relatedness in British grey seal colonies. / Wilmer, J.W.; Overall, Andrew; Pomeroy, P.P.; Twiss, S.D.; Amos, W.

In: Molecular Ecology, Vol. 9, No. 3, 31.03.2000, p. 283-292.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Patterns of paternal relatedness in British grey seal colonies

AU - Wilmer, J.W.

AU - Overall, Andrew

AU - Pomeroy, P.P.

AU - Twiss, S.D.

AU - Amos, W.

PY - 2000/3/31

Y1 - 2000/3/31

N2 - Previous studies of breeding behaviour in the grey seal, Halichoerus grypus, have painted conflicting pictures. Behavioural observations suggest a classical polygynous system with a small number of dominant males fathering most of the offspring. However, genetic analysis suggests that many potential fathers spend little time ashore, that some pairs of seals show partner fidelity and that the dominant males are not as successful as their behaviour would suggest. Here we used paternal relatedness between pups with known mothers, sampled over an 11-year period, to show that behavioural dominance leading to enhanced fitness is a feature of only a handful of males located near the centre of the breeding colony. The vast majority of pups are fathered by any of a large number of males who all share approximately equal success, including virtually all those males who have previously escaped our best sampling efforts. As expected, the frequency of full-sibs is reduced in this longer time series relative to the original study. However, absolute estimates of the frequency of full-sibs seem to be confounded by a tendency for females who produce paternally unrelated pups to have conceived to males who are more genetically dissimilar from each other than expected by chance alone. Together, these elements of breeding behaviour would help to maintain maximum genetic diversity and to minimize the effects of inbreeding.

AB - Previous studies of breeding behaviour in the grey seal, Halichoerus grypus, have painted conflicting pictures. Behavioural observations suggest a classical polygynous system with a small number of dominant males fathering most of the offspring. However, genetic analysis suggests that many potential fathers spend little time ashore, that some pairs of seals show partner fidelity and that the dominant males are not as successful as their behaviour would suggest. Here we used paternal relatedness between pups with known mothers, sampled over an 11-year period, to show that behavioural dominance leading to enhanced fitness is a feature of only a handful of males located near the centre of the breeding colony. The vast majority of pups are fathered by any of a large number of males who all share approximately equal success, including virtually all those males who have previously escaped our best sampling efforts. As expected, the frequency of full-sibs is reduced in this longer time series relative to the original study. However, absolute estimates of the frequency of full-sibs seem to be confounded by a tendency for females who produce paternally unrelated pups to have conceived to males who are more genetically dissimilar from each other than expected by chance alone. Together, these elements of breeding behaviour would help to maintain maximum genetic diversity and to minimize the effects of inbreeding.

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Wilmer JW, Overall A, Pomeroy PP, Twiss SD, Amos W. Patterns of paternal relatedness in British grey seal colonies. Molecular Ecology. 2000 Mar 31;9(3):283-292.