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Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups

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Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups. / Groenewoud, Frank (Lead Author); Kingma, Sjouke A.; Hammers, Martijn; Dugdale, Hannah L.; Burke, Terry; Richardson, David S.; Komdeur, Jan.

In: Journal of Animal Ecology, Vol. 87, No. 5, 09.2018, p. 1251-1263.

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Groenewoud, Frank ; Kingma, Sjouke A. ; Hammers, Martijn ; Dugdale, Hannah L. ; Burke, Terry ; Richardson, David S. ; Komdeur, Jan. / Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups. In: Journal of Animal Ecology. 2018 ; Vol. 87, No. 5. pp. 1251-1263.

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@article{c1c0d78903ef4d52956184eea05b1550,
title = "Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups",
abstract = "1.In many cooperatively breeding animals, a combination of ecological constraints and benefits of philopatry favours offspring taking a subordinate position on the natal territory instead of dispersing to breed independently. However, in many species individuals disperse to a subordinate position in a non-natal group ({"}subordinate between-group{"} dispersal), despite losing the kin-selected and nepotistic benefits of remaining in the natal group. It is unclear which social, genetic and ecological factors drive between-group dispersal. 2.We aim to elucidate the adaptive significance of subordinate between-group dispersal by examining which factors promote such dispersal, whether subordinates gain improved ecological and social conditions by joining a non-natal group, and whether between-group dispersal results in increased lifetime reproductive success and survival. 3.Using a long-term dataset on the cooperatively-breeding Seychelles warbler (Acrocephalus sechellensis), we investigated 4.how a suite of proximate factors (food availability, group composition, age and sex of focal individuals, population density) promote subordinate between-group dispersal by comparing such dispersers with subordinates that dispersed to a dominant position or became floaters. We then analysed whether subordinates that moved to a dominant or non-natal subordinate position, or became floaters, gained improved conditions relative to the natal territory, and compared fitness components between the three dispersal strategies. 5.We show that individuals that joined another group as non-natal subordinates were mainly female and that, similar to floating, between-group dispersal was associated with social and demographic factors that constrained dispersal to an independent breeding position. Between-group dispersal was not driven by improved ecological or social conditions in the new territory and did not result in higher survival. Instead, between-group dispersing females often became co-breeders, obtaining maternity in the new territory, and were likely to inherit the territory in the future, leading to higher lifetime reproductive success compared to females that floated. Males never reproduced as subordinates, which may be one explanation why subordinate between-group dispersal by males is rare. 6.Our results suggest that subordinate between-group dispersal is used by females to obtain reproductive benefits when options to disperse to an independent breeding position are limited. This provides important insight into the additional strategies that individuals can use to obtain reproductive benefits. ",
keywords = "benefits of philopatry, subordinate between‐group dispersal, cooperative breeding, joint nesting, natal dispersal, communal breeding",
author = "Frank Groenewoud and Kingma, {Sjouke A.} and Martijn Hammers and Dugdale, {Hannah L.} and Terry Burke and Richardson, {David S.} and Jan Komdeur",
year = "2018",
month = sep,
doi = "10.1111/1365-2656.12849",
language = "English",
volume = "87",
pages = "1251--1263",
journal = "Journal of Animal Ecology",
issn = "0021-8790",
publisher = "Wiley",
number = "5",

}

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TY - JOUR

T1 - Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups

AU - Groenewoud, Frank

AU - Kingma, Sjouke A.

AU - Hammers, Martijn

AU - Dugdale, Hannah L.

AU - Burke, Terry

AU - Richardson, David S.

AU - Komdeur, Jan

PY - 2018/9

Y1 - 2018/9

N2 - 1.In many cooperatively breeding animals, a combination of ecological constraints and benefits of philopatry favours offspring taking a subordinate position on the natal territory instead of dispersing to breed independently. However, in many species individuals disperse to a subordinate position in a non-natal group ("subordinate between-group" dispersal), despite losing the kin-selected and nepotistic benefits of remaining in the natal group. It is unclear which social, genetic and ecological factors drive between-group dispersal. 2.We aim to elucidate the adaptive significance of subordinate between-group dispersal by examining which factors promote such dispersal, whether subordinates gain improved ecological and social conditions by joining a non-natal group, and whether between-group dispersal results in increased lifetime reproductive success and survival. 3.Using a long-term dataset on the cooperatively-breeding Seychelles warbler (Acrocephalus sechellensis), we investigated 4.how a suite of proximate factors (food availability, group composition, age and sex of focal individuals, population density) promote subordinate between-group dispersal by comparing such dispersers with subordinates that dispersed to a dominant position or became floaters. We then analysed whether subordinates that moved to a dominant or non-natal subordinate position, or became floaters, gained improved conditions relative to the natal territory, and compared fitness components between the three dispersal strategies. 5.We show that individuals that joined another group as non-natal subordinates were mainly female and that, similar to floating, between-group dispersal was associated with social and demographic factors that constrained dispersal to an independent breeding position. Between-group dispersal was not driven by improved ecological or social conditions in the new territory and did not result in higher survival. Instead, between-group dispersing females often became co-breeders, obtaining maternity in the new territory, and were likely to inherit the territory in the future, leading to higher lifetime reproductive success compared to females that floated. Males never reproduced as subordinates, which may be one explanation why subordinate between-group dispersal by males is rare. 6.Our results suggest that subordinate between-group dispersal is used by females to obtain reproductive benefits when options to disperse to an independent breeding position are limited. This provides important insight into the additional strategies that individuals can use to obtain reproductive benefits.

AB - 1.In many cooperatively breeding animals, a combination of ecological constraints and benefits of philopatry favours offspring taking a subordinate position on the natal territory instead of dispersing to breed independently. However, in many species individuals disperse to a subordinate position in a non-natal group ("subordinate between-group" dispersal), despite losing the kin-selected and nepotistic benefits of remaining in the natal group. It is unclear which social, genetic and ecological factors drive between-group dispersal. 2.We aim to elucidate the adaptive significance of subordinate between-group dispersal by examining which factors promote such dispersal, whether subordinates gain improved ecological and social conditions by joining a non-natal group, and whether between-group dispersal results in increased lifetime reproductive success and survival. 3.Using a long-term dataset on the cooperatively-breeding Seychelles warbler (Acrocephalus sechellensis), we investigated 4.how a suite of proximate factors (food availability, group composition, age and sex of focal individuals, population density) promote subordinate between-group dispersal by comparing such dispersers with subordinates that dispersed to a dominant position or became floaters. We then analysed whether subordinates that moved to a dominant or non-natal subordinate position, or became floaters, gained improved conditions relative to the natal territory, and compared fitness components between the three dispersal strategies. 5.We show that individuals that joined another group as non-natal subordinates were mainly female and that, similar to floating, between-group dispersal was associated with social and demographic factors that constrained dispersal to an independent breeding position. Between-group dispersal was not driven by improved ecological or social conditions in the new territory and did not result in higher survival. Instead, between-group dispersing females often became co-breeders, obtaining maternity in the new territory, and were likely to inherit the territory in the future, leading to higher lifetime reproductive success compared to females that floated. Males never reproduced as subordinates, which may be one explanation why subordinate between-group dispersal by males is rare. 6.Our results suggest that subordinate between-group dispersal is used by females to obtain reproductive benefits when options to disperse to an independent breeding position are limited. This provides important insight into the additional strategies that individuals can use to obtain reproductive benefits.

KW - benefits of philopatry

KW - subordinate between‐group dispersal

KW - cooperative breeding

KW - joint nesting

KW - natal dispersal

KW - communal breeding

U2 - 10.1111/1365-2656.12849

DO - 10.1111/1365-2656.12849

M3 - Article

VL - 87

SP - 1251

EP - 1263

JO - Journal of Animal Ecology

JF - Journal of Animal Ecology

SN - 0021-8790

IS - 5

ER -

ID: 134512911