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Cooperative breeding favors maternal investment in size over number of eggs in spiders

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Cooperative breeding favors maternal investment in size over number of eggs in spiders. / Grinsted, Lena; Breuker, Casper J; Bilde, Trine.

In: Evolution, Vol. 68, No. 7, 07.2014, p. 1961-1973.

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Grinsted, Lena ; Breuker, Casper J ; Bilde, Trine. / Cooperative breeding favors maternal investment in size over number of eggs in spiders. In: Evolution. 2014 ; Vol. 68, No. 7. pp. 1961-1973.

Bibtex

@article{1a4cb30d9e114bacb1e33bdd91c42e74,
title = "Cooperative breeding favors maternal investment in size over number of eggs in spiders",
abstract = "The transition to cooperative breeding may alter maternal investment strategies depending on density of breeders, extent of reproductive skew, and allo-maternal care. Change in optimal investment from solitary to cooperative breeding can be investigated by comparing social species with nonsocial congeners. We tested two hypotheses in a mainly semelparous system: that social, cooperative breeders, compared to subsocial, solitarily breeding congeners, (1) lay fewer and larger eggs because larger offspring compete better for limited resources and become reproducers; (2) induce egg size variation within clutches as a bet-hedging strategy to ensure that some offspring become reproducers. Within two spider genera, Anelosimus and Stegodyphus, we compared species from similar habitats and augmented the results with a mini-meta-analysis of egg numbers depicted in phylogenies. We found that social species indeed laid fewer, larger eggs than subsocials, while egg size variation was low overall, giving no support for bet-hedging. We propose that the transition to cooperative breeding selects for producing few, large offspring because reproductive skew and high density of breeders and young create competition for resources and reproduction. Convergent evolution has shaped maternal strategies similarly in phylogenetically distant species and directed cooperatively breeding spiders to invest in quality rather than quantity of offspring.",
author = "Lena Grinsted and Breuker, {Casper J} and Trine Bilde",
note = "{\textcopyright} 2014 The Author(s). Evolution {\textcopyright} 2014 The Society for the Study of Evolution.",
year = "2014",
month = jul,
doi = "10.1111/evo.12411",
language = "English",
volume = "68",
pages = "1961--1973",
journal = "Evolution",
issn = "0014-3820",
publisher = "Wiley-Blackwell Publishing Ltd.",
number = "7",

}

RIS

TY - JOUR

T1 - Cooperative breeding favors maternal investment in size over number of eggs in spiders

AU - Grinsted, Lena

AU - Breuker, Casper J

AU - Bilde, Trine

N1 - © 2014 The Author(s). Evolution © 2014 The Society for the Study of Evolution.

PY - 2014/7

Y1 - 2014/7

N2 - The transition to cooperative breeding may alter maternal investment strategies depending on density of breeders, extent of reproductive skew, and allo-maternal care. Change in optimal investment from solitary to cooperative breeding can be investigated by comparing social species with nonsocial congeners. We tested two hypotheses in a mainly semelparous system: that social, cooperative breeders, compared to subsocial, solitarily breeding congeners, (1) lay fewer and larger eggs because larger offspring compete better for limited resources and become reproducers; (2) induce egg size variation within clutches as a bet-hedging strategy to ensure that some offspring become reproducers. Within two spider genera, Anelosimus and Stegodyphus, we compared species from similar habitats and augmented the results with a mini-meta-analysis of egg numbers depicted in phylogenies. We found that social species indeed laid fewer, larger eggs than subsocials, while egg size variation was low overall, giving no support for bet-hedging. We propose that the transition to cooperative breeding selects for producing few, large offspring because reproductive skew and high density of breeders and young create competition for resources and reproduction. Convergent evolution has shaped maternal strategies similarly in phylogenetically distant species and directed cooperatively breeding spiders to invest in quality rather than quantity of offspring.

AB - The transition to cooperative breeding may alter maternal investment strategies depending on density of breeders, extent of reproductive skew, and allo-maternal care. Change in optimal investment from solitary to cooperative breeding can be investigated by comparing social species with nonsocial congeners. We tested two hypotheses in a mainly semelparous system: that social, cooperative breeders, compared to subsocial, solitarily breeding congeners, (1) lay fewer and larger eggs because larger offspring compete better for limited resources and become reproducers; (2) induce egg size variation within clutches as a bet-hedging strategy to ensure that some offspring become reproducers. Within two spider genera, Anelosimus and Stegodyphus, we compared species from similar habitats and augmented the results with a mini-meta-analysis of egg numbers depicted in phylogenies. We found that social species indeed laid fewer, larger eggs than subsocials, while egg size variation was low overall, giving no support for bet-hedging. We propose that the transition to cooperative breeding selects for producing few, large offspring because reproductive skew and high density of breeders and young create competition for resources and reproduction. Convergent evolution has shaped maternal strategies similarly in phylogenetically distant species and directed cooperatively breeding spiders to invest in quality rather than quantity of offspring.

U2 - 10.1111/evo.12411

DO - 10.1111/evo.12411

M3 - Journal article

C2 - 24654980

VL - 68

SP - 1961

EP - 1973

JO - Evolution

JF - Evolution

SN - 0014-3820

IS - 7

ER -