Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020)
To support sustainable management of apex predator populations, it is important to estimate population size and understand the drivers of population trends to anticipate the consequences of human decisions. Robust population models are needed, which must be based on realistic biological principles a...
Published in: | NAMMCO Scientific Publications |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Septentrio Academic Publishing
2021
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Subjects: | |
Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794 https://doi.org/10.7557/3.5794 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/5794 |
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openpolar |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
pinniped management population dynamics modelling Bayesian maximum likelihood age-structured pup production MCMC sequential importance sampling particle filter |
spellingShingle |
pinniped management population dynamics modelling Bayesian maximum likelihood age-structured pup production MCMC sequential importance sampling particle filter Smout, Sophie Murray, Kimberly Aarts, Geert Biuw, Martin Brasseur, Sophie Buren, Alejandro Empacher, Fanny Frie, Anne Kirstine Grecian, James Hammill, Mike Mikkelsen, Bjarni Mosnier, Arnaud Rosing-Asvid, Aqqalu Russell, Debbie Skaug, Hans Stenson, Garry Thomas, Len ver Hoef, Jay Witting, Lars Zabavnikov, Vladimir Øigård, Tor Arne Fernandez, Ruth Wickson, Fern Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
topic_facet |
pinniped management population dynamics modelling Bayesian maximum likelihood age-structured pup production MCMC sequential importance sampling particle filter |
description |
To support sustainable management of apex predator populations, it is important to estimate population size and understand the drivers of population trends to anticipate the consequences of human decisions. Robust population models are needed, which must be based on realistic biological principles and validated with the best available data. A team of international experts reviewed age-structured models of North Atlantic pinniped populations, including Grey seal (Halichoerus grypus), Harp seal (Pagophilus groenlandicus), and Hooded seal (Cystophora cristata). Statistical methods used to fit such models to data were compared and contrasted. Differences in biological assumptions and model equations were driven by the data available from separate studies, including observation methodology and pre-processing. Counts of pups during the breeding season were used in all models, with additional counts of adults and juveniles available in some. The regularity and frequency of data collection, including survey counts and vital rate estimates, varied. Important differences between the models concerned the nature and causes of variation in vital rates (age-dependent survival and fecundity). Parameterisation of age at maturity was detailed and time-dependent in some models and simplified in others. Methods for estimation of model parameters were reviewed and compared. They included Bayesian and maximum likelihood (ML) approaches, implemented via bespoke coding in C, C++, TMB or JAGS. Comparative model runs suggested that as expected, ML-based implementations were rapid and computationally efficient, while Bayesian approaches, which used MCMC or sequential importance sampling, required longer for inference. For grey seal populations in the Netherlands, where preliminary ML-based TMB results were compared with the outputs of a Bayesian JAGS implementation, some differences in parameter estimates were apparent. For these seal populations, further investigations are recommended to explore differences that might result from the ... |
format |
Article in Journal/Newspaper |
author |
Smout, Sophie Murray, Kimberly Aarts, Geert Biuw, Martin Brasseur, Sophie Buren, Alejandro Empacher, Fanny Frie, Anne Kirstine Grecian, James Hammill, Mike Mikkelsen, Bjarni Mosnier, Arnaud Rosing-Asvid, Aqqalu Russell, Debbie Skaug, Hans Stenson, Garry Thomas, Len ver Hoef, Jay Witting, Lars Zabavnikov, Vladimir Øigård, Tor Arne Fernandez, Ruth Wickson, Fern |
author_facet |
Smout, Sophie Murray, Kimberly Aarts, Geert Biuw, Martin Brasseur, Sophie Buren, Alejandro Empacher, Fanny Frie, Anne Kirstine Grecian, James Hammill, Mike Mikkelsen, Bjarni Mosnier, Arnaud Rosing-Asvid, Aqqalu Russell, Debbie Skaug, Hans Stenson, Garry Thomas, Len ver Hoef, Jay Witting, Lars Zabavnikov, Vladimir Øigård, Tor Arne Fernandez, Ruth Wickson, Fern |
author_sort |
Smout, Sophie |
title |
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
title_short |
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
title_full |
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
title_fullStr |
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
title_full_unstemmed |
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) |
title_sort |
report of the nammco-ices workshop on seal modelling (wkseals 2020) |
publisher |
Septentrio Academic Publishing |
publishDate |
2021 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794 https://doi.org/10.7557/3.5794 |
genre |
Cystophora cristata Harp Seal hooded seal North Atlantic Pagophilus groenlandicus |
genre_facet |
Cystophora cristata Harp Seal hooded seal North Atlantic Pagophilus groenlandicus |
op_source |
NAMMCO Scientific Publications; Vol. 12 (2022): Marine Mammals in the North Atlantic 2309-2491 1560-2206 10.7557/3.12 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5615 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5613 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5614 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5610 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5611 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5607 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5608 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5609 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794 doi:10.7557/3.5794 |
op_rights |
Copyright (c) 2021 Sophie Smout, Kimberly Murray, Geert Aarts, Martin Biuw, Sophie Brasseur, Alejandro Buren, Fanny Empacher, Anne Kirstine Frie, James Grecian, Mike Hammill, Bjarni Mikkelsen, Arnaud Mosnier, Aqqalu Rosing-Asvid, Debbie Russell, Hans Skaug, Garry Stenson, Len Thomas, Jay ver Hoef, Lars Witting, Vladimir Zabavnikov, Tor Arne Øigård, Ruth Fernandez, Fern Wickson |
op_doi |
https://doi.org/10.7557/3.579410.7557/3.12 |
container_title |
NAMMCO Scientific Publications |
container_volume |
12 |
container_issue |
1 |
_version_ |
1779314076651880448 |
spelling |
ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/5794 2023-10-09T21:50:58+02:00 Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) Smout, Sophie Murray, Kimberly Aarts, Geert Biuw, Martin Brasseur, Sophie Buren, Alejandro Empacher, Fanny Frie, Anne Kirstine Grecian, James Hammill, Mike Mikkelsen, Bjarni Mosnier, Arnaud Rosing-Asvid, Aqqalu Russell, Debbie Skaug, Hans Stenson, Garry Thomas, Len ver Hoef, Jay Witting, Lars Zabavnikov, Vladimir Øigård, Tor Arne Fernandez, Ruth Wickson, Fern 2021-05-18 application/pdf image/png image/jpeg https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794 https://doi.org/10.7557/3.5794 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5615 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5613 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5614 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5610 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5611 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5607 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5608 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794/5609 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/5794 doi:10.7557/3.5794 Copyright (c) 2021 Sophie Smout, Kimberly Murray, Geert Aarts, Martin Biuw, Sophie Brasseur, Alejandro Buren, Fanny Empacher, Anne Kirstine Frie, James Grecian, Mike Hammill, Bjarni Mikkelsen, Arnaud Mosnier, Aqqalu Rosing-Asvid, Debbie Russell, Hans Skaug, Garry Stenson, Len Thomas, Jay ver Hoef, Lars Witting, Vladimir Zabavnikov, Tor Arne Øigård, Ruth Fernandez, Fern Wickson NAMMCO Scientific Publications; Vol. 12 (2022): Marine Mammals in the North Atlantic 2309-2491 1560-2206 10.7557/3.12 pinniped management population dynamics modelling Bayesian maximum likelihood age-structured pup production MCMC sequential importance sampling particle filter info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftunitroemsoe https://doi.org/10.7557/3.579410.7557/3.12 2023-09-20T23:07:55Z To support sustainable management of apex predator populations, it is important to estimate population size and understand the drivers of population trends to anticipate the consequences of human decisions. Robust population models are needed, which must be based on realistic biological principles and validated with the best available data. A team of international experts reviewed age-structured models of North Atlantic pinniped populations, including Grey seal (Halichoerus grypus), Harp seal (Pagophilus groenlandicus), and Hooded seal (Cystophora cristata). Statistical methods used to fit such models to data were compared and contrasted. Differences in biological assumptions and model equations were driven by the data available from separate studies, including observation methodology and pre-processing. Counts of pups during the breeding season were used in all models, with additional counts of adults and juveniles available in some. The regularity and frequency of data collection, including survey counts and vital rate estimates, varied. Important differences between the models concerned the nature and causes of variation in vital rates (age-dependent survival and fecundity). Parameterisation of age at maturity was detailed and time-dependent in some models and simplified in others. Methods for estimation of model parameters were reviewed and compared. They included Bayesian and maximum likelihood (ML) approaches, implemented via bespoke coding in C, C++, TMB or JAGS. Comparative model runs suggested that as expected, ML-based implementations were rapid and computationally efficient, while Bayesian approaches, which used MCMC or sequential importance sampling, required longer for inference. For grey seal populations in the Netherlands, where preliminary ML-based TMB results were compared with the outputs of a Bayesian JAGS implementation, some differences in parameter estimates were apparent. For these seal populations, further investigations are recommended to explore differences that might result from the ... Article in Journal/Newspaper Cystophora cristata Harp Seal hooded seal North Atlantic Pagophilus groenlandicus University of Tromsø: Septentrio Academic Publishing NAMMCO Scientific Publications 12 1 |