Intrinsic and extrinsic factors drive ontogeny of early-life at-sea behaviour in a marine top predator
MetadataShow full item record
Young animals must learn to forage effectively to survive the transition from parental provisioning to independent feeding. Rapid development of successful foraging strategies is particularly important for capital breeders that do not receive parental guidance after weaning. The intrinsic and extrinsic drivers of variation in ontogeny of foraging are poorly understood for many species. Grey seals (Halichoerus grypus) are typical capital breeders; pups are abandoned on the natal site after a brief suckling phase, and must develop foraging skills without external input. We collected location and dive data from recently-weaned grey seal pups from two regions of the United Kingdom (the North Sea and the Celtic and Irish Seas) using animal-borne telemetry devices during their first months of independence at sea. Dive duration, depth, bottom time, and benthic diving increased over the first 40 days. The shape and magnitude of changes differed between regions. Females consistently had longer bottom times, and in the Celtic and Irish Seas they used shallower water than males. Regional sex differences suggest that extrinsic factors, such as water depth, contribute to behavioural sexual segregation. We recommend that conservation strategies consider movements of young naïve animals in addition to those of adults to account for developmental behavioural changes.
Carter , M I D , Russell , D J F , Embling , C B , Blight , C J , Thompson , D , Hosegood , P J & Bennett , K A 2017 , ' Intrinsic and extrinsic factors drive ontogeny of early-life at-sea behaviour in a marine top predator ' , Scientific Reports , vol. 7 , no. 1 , 15505 . https://doi.org/10.1038/s41598-017-15859-8
© The Author(s) 2017. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
DescriptionTags, and their deployments, were funded by the Welsh Assembly Government (Welsh colonies; project no. JER3688), Marine Scotland (Stroma and Muckle Green Holm; project no. CR/2009/48), the Natural Environment Research Council (NERC) (Isle of May) and SMRU Instrumentation (Isle of May). MIDC studentship is co-funded by Plymouth University School of Biological & Marine Sciences and NERC. DJFR, CJB & DT are supported by National Capability funding from NERC to SMRU (grant no. SMRU1001).
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.