Intragroup competition predicts individual foraging specialisation in a group-living mammal

Katherine E Sheppard, Richard Inger, Robbie A. McDonald, Sam Barker, Andrew L. Jackson, Faye J. Thompson, Emma I K Vitikainen, Michael A. Cant, Harry H. Marshall

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

Individual foraging specialisation has important ecological implications, but its causes in group-living species are unclear. One of the major consequences of group living is increased intragroup competition for resources. Foraging theory predicts that with increased competition, individuals should add new prey items to their diet, widening their foraging niche (‘optimal foraging hypothesis’). However, classic competition theory suggests the opposite: that increased competition leads to niche partitioning and greater individual foraging specialisation (‘niche partitioning hypothesis’). We tested these opposing predictions in wild, group-living banded mongooses (Mungos mungo), using stable isotope analysis of banded mongoose whiskers to quantify individual and group foraging niche. Individual foraging niche size declined with increasing group size, despite all groups having a similar overall niche size. Our findings support the prediction that competition promotes niche partitioning within social groups and suggest that individual foraging specialisation may play an important role in the formation of stable social groupings.
Alkuperäiskielienglanti
LehtiEcology Letters
Vuosikerta21
Numero5
Sivut665-673
Sivumäärä9
ISSN1461-023X
DOI - pysyväislinkit
TilaJulkaistu - toukokuuta 2018
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 1181 Ekologia, evoluutiobiologia

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