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Experimental evidence that intruder and group member attributes affect outgroup defence and associated within-group interactions in a social fish

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Experimental evidence that intruder and group member attributes affect outgroup defence and associated within-group interactions in a social fish. / Goncalves, Ines Braga; Radford, Andrew N.

In: Proceedings of the Royal Society B: Biological Sciences, Vol. 286, No. 1912, 20191261, 09.10.2019.

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@article{4c2002d409604c11aea4387ed229079f,
title = "Experimental evidence that intruder and group member attributes affect outgroup defence and associated within-group interactions in a social fish",
abstract = "In many social species, individuals communally defend resources from conspecific outsiders. Participation in defence and in associated within-group interactions, both during and after contests with outgroup rivals, is expected to vary between group members because the threat presented by different outsiders is not the same to each individual. However, experimental tests examining both the contributions to, and the consequences of, outgroup conflict for all group members are lacking. Using groups of the cichlid Neolamprologus pulcher, we simulated territorial intrusions by different-sized female rivals and altered the potential contribution of subordinate females to defence. Dominant females and subordinate females defended significantly more against size- and rank-matched intruders, while males displayed lower and less variable levels of defence. Large and small, but not intermediate-sized, intruders induced increased levels of within-group aggression during intrusions, which was targeted at the subordinate females. Preventing subordinate females from helping in territorial defence led to significant decreases in post-contest within-group and female-specific submissive and affiliative displays. Together, these results show that the defensive contributions of group members vary greatly depending both on their own traits and on intruder identity, and this variation has significant consequences for within-group social dynamics both during and in the aftermath of outgroup contests.",
keywords = "Defensive contributions, Neolamprologus pulcher, Outgroup conflict, Social interactions, Territorial intrusions",
author = "Goncalves, {Ines Braga} and Radford, {Andrew N.}",
year = "2019",
month = "10",
day = "9",
doi = "10.1098/rspb.2019.1261",
language = "English",
volume = "286",
journal = "Proceedings of the Royal Society B: Biological Sciences",
issn = "0962-8452",
publisher = "The Royal Society",
number = "1912",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Experimental evidence that intruder and group member attributes affect outgroup defence and associated within-group interactions in a social fish

AU - Goncalves, Ines Braga

AU - Radford, Andrew N.

PY - 2019/10/9

Y1 - 2019/10/9

N2 - In many social species, individuals communally defend resources from conspecific outsiders. Participation in defence and in associated within-group interactions, both during and after contests with outgroup rivals, is expected to vary between group members because the threat presented by different outsiders is not the same to each individual. However, experimental tests examining both the contributions to, and the consequences of, outgroup conflict for all group members are lacking. Using groups of the cichlid Neolamprologus pulcher, we simulated territorial intrusions by different-sized female rivals and altered the potential contribution of subordinate females to defence. Dominant females and subordinate females defended significantly more against size- and rank-matched intruders, while males displayed lower and less variable levels of defence. Large and small, but not intermediate-sized, intruders induced increased levels of within-group aggression during intrusions, which was targeted at the subordinate females. Preventing subordinate females from helping in territorial defence led to significant decreases in post-contest within-group and female-specific submissive and affiliative displays. Together, these results show that the defensive contributions of group members vary greatly depending both on their own traits and on intruder identity, and this variation has significant consequences for within-group social dynamics both during and in the aftermath of outgroup contests.

AB - In many social species, individuals communally defend resources from conspecific outsiders. Participation in defence and in associated within-group interactions, both during and after contests with outgroup rivals, is expected to vary between group members because the threat presented by different outsiders is not the same to each individual. However, experimental tests examining both the contributions to, and the consequences of, outgroup conflict for all group members are lacking. Using groups of the cichlid Neolamprologus pulcher, we simulated territorial intrusions by different-sized female rivals and altered the potential contribution of subordinate females to defence. Dominant females and subordinate females defended significantly more against size- and rank-matched intruders, while males displayed lower and less variable levels of defence. Large and small, but not intermediate-sized, intruders induced increased levels of within-group aggression during intrusions, which was targeted at the subordinate females. Preventing subordinate females from helping in territorial defence led to significant decreases in post-contest within-group and female-specific submissive and affiliative displays. Together, these results show that the defensive contributions of group members vary greatly depending both on their own traits and on intruder identity, and this variation has significant consequences for within-group social dynamics both during and in the aftermath of outgroup contests.

KW - Defensive contributions

KW - Neolamprologus pulcher

KW - Outgroup conflict

KW - Social interactions

KW - Territorial intrusions

UR - http://www.scopus.com/inward/record.url?scp=85073076599&partnerID=8YFLogxK

U2 - 10.1098/rspb.2019.1261

DO - 10.1098/rspb.2019.1261

M3 - Article

C2 - 31594516

AN - SCOPUS:85073076599

VL - 286

JO - Proceedings of the Royal Society B: Biological Sciences

JF - Proceedings of the Royal Society B: Biological Sciences

SN - 0962-8452

IS - 1912

M1 - 20191261

ER -