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Limited male dispersal in a social spider with extreme inbreeding

Lubin, Yael; Birkhofer, Klaus LU ; Berger-Tal, Reut and Bilde, Trine (2009) In Biological Journal of the Linnean Society 97(2). p.227-234
Abstract
Cooperatively breeding animals commonly avoid incestuous mating through pre-mating dispersal. However, a few group-living organisms, including the social spiders, have low pre-mating dispersal, intra-colony mating, and inbreeding. This results in limited gene flow among colonies and sub-structured populations. The social spiders also exhibit female-biased sex ratios because survival benefits to large colonies favour high group productivity, which selects against 1 : 1 sex ratios. Although propagule dispersal of mated females may occasionally bring about limited gene flow, little is known about the role of male dispersal. We assessed the extent of male movement between colonies in natural populations both experimentally and by studying... (More)
Cooperatively breeding animals commonly avoid incestuous mating through pre-mating dispersal. However, a few group-living organisms, including the social spiders, have low pre-mating dispersal, intra-colony mating, and inbreeding. This results in limited gene flow among colonies and sub-structured populations. The social spiders also exhibit female-biased sex ratios because survival benefits to large colonies favour high group productivity, which selects against 1 : 1 sex ratios. Although propagule dispersal of mated females may occasionally bring about limited gene flow, little is known about the role of male dispersal. We assessed the extent of male movement between colonies in natural populations both experimentally and by studying colony sex ratios over the mating season. We show that males frequently move to neighbouring colonies, whereas only 4% of incipient nests were visited by dispersing males. Neighbouring colonies are genetically similar and movement within colony clusters does not contribute to gene flow. Post-mating sex ratio bias was high early in the mating season due to protandry, and also in colonies at the end of the season, suggesting that males remain in the colony when mated females have dispersed. Thus, male dispersal is unlikely to facilitate gene flow between different matrilineages. This is consistent with models of non-Fisherian group-level selection for the maintenance of female biased sex ratios, which predict the elimination of male dispersal. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
breeding system, gene flow, matrilineages, movement, sex ratio
in
Biological Journal of the Linnean Society
volume
97
issue
2
pages
227 - 234
publisher
Linnean Society of London
external identifiers
  • scopus:66149104790
ISSN
0024-4066
DOI
10.1111/j.1095-8312.2009.01190.x
language
English
LU publication?
yes
id
6c1a464f-a54b-4ea4-8584-b1a3859ef991 (old id 2440460)
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http://www.scopus.com/inward/record.url?eid=2-s2.0-66149104790&partnerID=40&md5=7705a9fb876c99d52895f07e57628d37
date added to LUP
2012-06-18 16:54:09
date last changed
2017-09-17 05:07:30
@article{6c1a464f-a54b-4ea4-8584-b1a3859ef991,
  abstract     = {Cooperatively breeding animals commonly avoid incestuous mating through pre-mating dispersal. However, a few group-living organisms, including the social spiders, have low pre-mating dispersal, intra-colony mating, and inbreeding. This results in limited gene flow among colonies and sub-structured populations. The social spiders also exhibit female-biased sex ratios because survival benefits to large colonies favour high group productivity, which selects against 1 : 1 sex ratios. Although propagule dispersal of mated females may occasionally bring about limited gene flow, little is known about the role of male dispersal. We assessed the extent of male movement between colonies in natural populations both experimentally and by studying colony sex ratios over the mating season. We show that males frequently move to neighbouring colonies, whereas only 4% of incipient nests were visited by dispersing males. Neighbouring colonies are genetically similar and movement within colony clusters does not contribute to gene flow. Post-mating sex ratio bias was high early in the mating season due to protandry, and also in colonies at the end of the season, suggesting that males remain in the colony when mated females have dispersed. Thus, male dispersal is unlikely to facilitate gene flow between different matrilineages. This is consistent with models of non-Fisherian group-level selection for the maintenance of female biased sex ratios, which predict the elimination of male dispersal.},
  author       = {Lubin, Yael and Birkhofer, Klaus and Berger-Tal, Reut and Bilde, Trine},
  issn         = {0024-4066},
  keyword      = {breeding system,gene flow,matrilineages,movement,sex ratio},
  language     = {eng},
  number       = {2},
  pages        = {227--234},
  publisher    = {Linnean Society of London},
  series       = {Biological Journal of the Linnean Society},
  title        = {Limited male dispersal in a social spider with extreme inbreeding},
  url          = {http://dx.doi.org/10.1111/j.1095-8312.2009.01190.x},
  volume       = {97},
  year         = {2009},
}