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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Individual differences in searching behaviour and spatial foraging consistency in a central place marine predator
Oikos, Volume 123, No. 1, Year 2014
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Description
Consistent intra-population variability in foraging behaviour is found among a wide range of taxa. Such foraging specialisations are common among marine vertebrates, yet it is not clear how individuals repeatedly locate prey or foraging sites at ocean-wide scales. Using GPS and time-depth loggers we studied the fine-scale foraging behaviour of central-place northern gannets Morus bassanus at two large colonies. First, we estimated the degree of consistency in individual foraging routes and sites across repeated trips. Second, we tested for individual differences in searching behaviour in response to environmental covariates using reaction norms, estimated from mixed effect models. Adult gannets tracked over multiple foraging trips showed repeatable between-individual differences in terminal points and departure angles of foraging trips, but low repeatability in trip duration and trip length. Importantly, individual birds showed highly repeatable dive locations, with consistently different environmental conditions (such as copepod abundance), suggesting a high degree of foraging site specialisation. Gannets also showed between-individual differences in searching behaviour along environmental gradients, such that individuals intensified searching under different conditions. Together these results suggest that widespread individual foraging consistency may represent specialisation and be linked with individual responses to environmental conditions. Such divergent searching behaviour could provide a mechanism by which consistent foraging behaviour arises and is maintained among animals that forage across large spatial scales. © 2013 The Authors.
Authors & Co-Authors
Patrick, Samantha Clare
United Kingdom, Cheltenham
University of Gloucestershire
France, Villiers-en-bois
Centre D’études Biologiques de Chizé Cebc
Bearhop, Stuart
United Kingdom, Exeter
University of Exeter
Grémillet, David
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
South Africa, Cape Town
University of Cape Town
Lescroël, Amélie
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
France, Rennes
Université de Rennes
Grecian, W. James
United Kingdom, Plymouth
University of Plymouth
Bodey, Thomas W.
United Kingdom, Exeter
University of Exeter
Hamer, Keith C.
United Kingdom, Leeds
University of Leeds
Wakefield, Ewan D.
United Kingdom, Leeds
University of Leeds
Le Nuz, Mélanie
France
Réserve Naturelle Des Sept-iles Station
Votier, Stephen Charles
United Kingdom, Plymouth
University of Plymouth
United Kingdom, Exeter
University of Exeter
Statistics
Citations: 152
Authors: 10
Affiliations: 9
Identifiers
Doi:
10.1111/j.1600-0706.2013.00406.x
ISSN:
00301299
e-ISSN:
16000706
Study Design
Cross Sectional Study