Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals
Investigation of activity budgets in relation to seasonal, intrinsic (age, sex) and extrinsic (time of day, spatial) covariates enables an understanding of how such covariates shape behavioural strategies. However, conducting such investigations in the wild is challenging, because of the required la...
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crwiley:10.1111/oik.01810 2024-10-20T14:11:14+00:00 Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals Russell, Deborah J. F. McClintock, Brett T. Matthiopoulos, Jason Thompson, Paul M. Thompson, Dave Hammond, Phil S. Jones, Esther L. MacKenzie, Monique L. Moss, Simon McConnell, Bernie J. Department of Energy and Climate Change Natural Environment Research Council European Commission 2015 http://dx.doi.org/10.1111/oik.01810 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Foik.01810 https://onlinelibrary.wiley.com/doi/pdf/10.1111/oik.01810 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Oikos volume 124, issue 11, page 1462-1472 ISSN 0030-1299 1600-0706 journal-article 2015 crwiley https://doi.org/10.1111/oik.01810 2024-09-23T04:35:31Z Investigation of activity budgets in relation to seasonal, intrinsic (age, sex) and extrinsic (time of day, spatial) covariates enables an understanding of how such covariates shape behavioural strategies. However, conducting such investigations in the wild is challenging, because of the required large sample size of individuals across the annual cycle, and difficulties in categorising behavioural states and analysing the resulting individual‐referenced and serially correlated data. In this study, from telemetry tags deployed on 63 grey seals Halichoerus grypus and 126 harbour seals Phoca vitulina we used behavioural data, and movement data within a Bayesian state–space model (SSM), to define population‐level activity budgets around Britain. Using generalised estimating equations (GEEs) we then examined how time spent in four states (resting on land (hauled out), resting at sea, foraging and travelling) was influenced by seasonal, intrinsic and extrinsic covariates. We present and discuss the following key findings. 1) We found no evidence that regional variation in foraging effort was linked to regional population trajectories in harbour seals. 2) Grey seals demonstrated sex‐specific seasonal differences in their activity budgets, independent from those related to reproductive costs. 3) In these sympatric species there was evidence of temporal separation in time hauled out, but not in time foraging. 4) In both species, time spent resting at sea was separated into inshore (associated with tidal haul out availability) and offshore areas. Time spent resting at sea and on land was interchangeable to some extent, suggesting a degree of overlap in their functionality. This may result in a relaxation of the constraints associated with a central place foraging strategy. More generally, we demonstrate how a large dataset, incorporating differing tag parameters, can be analysed to define activity budgets and subsequently address important ecological questions. Article in Journal/Newspaper Phoca vitulina Wiley Online Library Oikos 124 11 1462 1472 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Investigation of activity budgets in relation to seasonal, intrinsic (age, sex) and extrinsic (time of day, spatial) covariates enables an understanding of how such covariates shape behavioural strategies. However, conducting such investigations in the wild is challenging, because of the required large sample size of individuals across the annual cycle, and difficulties in categorising behavioural states and analysing the resulting individual‐referenced and serially correlated data. In this study, from telemetry tags deployed on 63 grey seals Halichoerus grypus and 126 harbour seals Phoca vitulina we used behavioural data, and movement data within a Bayesian state–space model (SSM), to define population‐level activity budgets around Britain. Using generalised estimating equations (GEEs) we then examined how time spent in four states (resting on land (hauled out), resting at sea, foraging and travelling) was influenced by seasonal, intrinsic and extrinsic covariates. We present and discuss the following key findings. 1) We found no evidence that regional variation in foraging effort was linked to regional population trajectories in harbour seals. 2) Grey seals demonstrated sex‐specific seasonal differences in their activity budgets, independent from those related to reproductive costs. 3) In these sympatric species there was evidence of temporal separation in time hauled out, but not in time foraging. 4) In both species, time spent resting at sea was separated into inshore (associated with tidal haul out availability) and offshore areas. Time spent resting at sea and on land was interchangeable to some extent, suggesting a degree of overlap in their functionality. This may result in a relaxation of the constraints associated with a central place foraging strategy. More generally, we demonstrate how a large dataset, incorporating differing tag parameters, can be analysed to define activity budgets and subsequently address important ecological questions. |
author2 |
Department of Energy and Climate Change Natural Environment Research Council European Commission |
format |
Article in Journal/Newspaper |
author |
Russell, Deborah J. F. McClintock, Brett T. Matthiopoulos, Jason Thompson, Paul M. Thompson, Dave Hammond, Phil S. Jones, Esther L. MacKenzie, Monique L. Moss, Simon McConnell, Bernie J. |
spellingShingle |
Russell, Deborah J. F. McClintock, Brett T. Matthiopoulos, Jason Thompson, Paul M. Thompson, Dave Hammond, Phil S. Jones, Esther L. MacKenzie, Monique L. Moss, Simon McConnell, Bernie J. Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
author_facet |
Russell, Deborah J. F. McClintock, Brett T. Matthiopoulos, Jason Thompson, Paul M. Thompson, Dave Hammond, Phil S. Jones, Esther L. MacKenzie, Monique L. Moss, Simon McConnell, Bernie J. |
author_sort |
Russell, Deborah J. F. |
title |
Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
title_short |
Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
title_full |
Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
title_fullStr |
Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
title_full_unstemmed |
Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
title_sort |
intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/oik.01810 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Foik.01810 https://onlinelibrary.wiley.com/doi/pdf/10.1111/oik.01810 |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
Oikos volume 124, issue 11, page 1462-1472 ISSN 0030-1299 1600-0706 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/oik.01810 |
container_title |
Oikos |
container_volume |
124 |
container_issue |
11 |
container_start_page |
1462 |
op_container_end_page |
1472 |
_version_ |
1813451527644250112 |