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...
Published in: | Oikos |
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Main Authors: | , , , , , , , , , |
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Language: | English |
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2015
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-drivers-of-activity-budgets-in-sympatric-grey-and-harbour-seals(8ef26166-033a-4a92-bbc7-885fa849aa6a).html https://doi.org/10.1111/oik.01810 https://research-repository.st-andrews.ac.uk/bitstream/10023/8329/1/Russell_act_bud_paper_v5.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/8ef26166-033a-4a92-bbc7-885fa849aa6a 2024-06-23T07:56:11+00:00 Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals Russell, Deborah Jill Fraser McClintock, Brett Thomas Matthiopoulos, Jason Thompson, Paul Thompson, David Hammond, Philip Steven Jones, Esther Lane MacKenzie, Monique Moss, Simon McConnell, Bernie J 2015-11 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-drivers-of-activity-budgets-in-sympatric-grey-and-harbour-seals(8ef26166-033a-4a92-bbc7-885fa849aa6a).html https://doi.org/10.1111/oik.01810 https://research-repository.st-andrews.ac.uk/bitstream/10023/8329/1/Russell_act_bud_paper_v5.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-drivers-of-activity-budgets-in-sympatric-grey-and-harbour-seals(8ef26166-033a-4a92-bbc7-885fa849aa6a).html info:eu-repo/semantics/openAccess Russell , D J F , McClintock , B T , Matthiopoulos , J , Thompson , P , Thompson , D , Hammond , P S , Jones , E L , MacKenzie , M , Moss , S & McConnell , B J 2015 , ' Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals ' , Oikos , vol. 124 , no. 11 , pp. 1462-1472 . https://doi.org/10.1111/oik.01810 Area-restricted search Bayesian Energetic requirements Energy budget Hidden process models Pinnipeds Time budget article 2015 ftunstandrewcris https://doi.org/10.1111/oik.01810 2024-06-13T00:44:41Z 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 University of St Andrews: Research Portal Oikos 124 11 1462 1472 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Area-restricted search Bayesian Energetic requirements Energy budget Hidden process models Pinnipeds Time budget |
spellingShingle |
Area-restricted search Bayesian Energetic requirements Energy budget Hidden process models Pinnipeds Time budget Russell, Deborah Jill Fraser McClintock, Brett Thomas Matthiopoulos, Jason Thompson, Paul Thompson, David Hammond, Philip Steven Jones, Esther Lane MacKenzie, Monique Moss, Simon McConnell, Bernie J Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals |
topic_facet |
Area-restricted search Bayesian Energetic requirements Energy budget Hidden process models Pinnipeds Time budget |
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. |
format |
Article in Journal/Newspaper |
author |
Russell, Deborah Jill Fraser McClintock, Brett Thomas Matthiopoulos, Jason Thompson, Paul Thompson, David Hammond, Philip Steven Jones, Esther Lane MacKenzie, Monique Moss, Simon McConnell, Bernie J |
author_facet |
Russell, Deborah Jill Fraser McClintock, Brett Thomas Matthiopoulos, Jason Thompson, Paul Thompson, David Hammond, Philip Steven Jones, Esther Lane MacKenzie, Monique Moss, Simon McConnell, Bernie J |
author_sort |
Russell, Deborah Jill Fraser |
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 |
publishDate |
2015 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-drivers-of-activity-budgets-in-sympatric-grey-and-harbour-seals(8ef26166-033a-4a92-bbc7-885fa849aa6a).html https://doi.org/10.1111/oik.01810 https://research-repository.st-andrews.ac.uk/bitstream/10023/8329/1/Russell_act_bud_paper_v5.pdf |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
Russell , D J F , McClintock , B T , Matthiopoulos , J , Thompson , P , Thompson , D , Hammond , P S , Jones , E L , MacKenzie , M , Moss , S & McConnell , B J 2015 , ' Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals ' , Oikos , vol. 124 , no. 11 , pp. 1462-1472 . https://doi.org/10.1111/oik.01810 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-drivers-of-activity-budgets-in-sympatric-grey-and-harbour-seals(8ef26166-033a-4a92-bbc7-885fa849aa6a).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/oik.01810 |
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Oikos |
container_volume |
124 |
container_issue |
11 |
container_start_page |
1462 |
op_container_end_page |
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