Echoes from the past : Regional variations in recovery within a harbour seal population
Terrestrial and marine wildlife populations have been severely reduced by hunting, fishing and habitat destruction, especially in the last centuries. Although management regulations have led to the recovery of some populations, the underlying processes are not always well understood. This study uses...
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Online Access: | https://research.wur.nl/en/publications/echoes-from-the-past-regional-variations-in-recovery-within-a-har https://doi.org/10.1371/journal.pone.0189674 |
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ftunivwagenin:oai:library.wur.nl:wurpubs/531966 2024-01-28T10:06:19+01:00 Echoes from the past : Regional variations in recovery within a harbour seal population Brasseur, Sophie M.J.M. Reijnders, Peter J.H. Cremer, Jenny Meesters, Erik Kirkwood, Roger Jensen, Lasse Fast Jeβ, Armin Galatius, Anders Teilmann, Jonas Aarts, Geert 2018 application/pdf https://research.wur.nl/en/publications/echoes-from-the-past-regional-variations-in-recovery-within-a-har https://doi.org/10.1371/journal.pone.0189674 en eng https://edepot.wur.nl/431946 https://research.wur.nl/en/publications/echoes-from-the-past-regional-variations-in-recovery-within-a-har doi:10.1371/journal.pone.0189674 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research PLoS ONE 13 (2018) 1 ISSN: 1932-6203 Life Science info:eu-repo/semantics/article Article/Letter to editor info:eu-repo/semantics/publishedVersion 2018 ftunivwagenin https://doi.org/10.1371/journal.pone.0189674 2024-01-03T23:15:24Z Terrestrial and marine wildlife populations have been severely reduced by hunting, fishing and habitat destruction, especially in the last centuries. Although management regulations have led to the recovery of some populations, the underlying processes are not always well understood. This study uses a 40-year time series of counts of harbour seals (Phoca vitulina) in the Wadden Sea to study these processes, and demonstrates the influence of historical regional differences in management regimes on the recovery of this population. While the Wadden Sea is considered one ecologically coupled zone, with a distinct harbour seal population, the area is divided into four geo-political regions i.e. the Netherlands, Lower Saxony including Hamburg, Schleswig-Holstein and Denmark. Gradually, seal hunting was banned between 1962 and 1977 in the different regions. Counts of moulting harbour seals and pup counts, obtained during aerial surveys between 1974 and 2014, show a population growth from approximately 4500 to 39,000 individuals. Population growth models were developed to assess if population growth differed between regions, taking into account two Phocine Distemper Virus (PDV) epizootics, in 1988 and 2002 which seriously affected the population. After a slow start prior to the first epizootic, the overall population grew exponentially at rates close to assumed maximum rates of increase in a harbour seal population. Recently, growth slowed down, potentially indicative of approaching carrying capacity. Regional differences in growth rates were demonstrated, with the highest recovery in Netherlands after the first PDV epizootic (i.e. 17.9%), suggesting that growth was fuelled by migration from the other regions, where growth remained at or below the intrinsic growth rate (13%). The seals’ distribution changed, and although the proportion of seals counted in the German regions declined, they remained by far the most important pupping region, with approximately 70% of all pups being born there. It is hypothesised that ... Article in Journal/Newspaper harbour seal Phoca vitulina Wageningen UR (University & Research Centre): Digital Library PLOS ONE 13 1 e0189674 |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
Life Science |
spellingShingle |
Life Science Brasseur, Sophie M.J.M. Reijnders, Peter J.H. Cremer, Jenny Meesters, Erik Kirkwood, Roger Jensen, Lasse Fast Jeβ, Armin Galatius, Anders Teilmann, Jonas Aarts, Geert Echoes from the past : Regional variations in recovery within a harbour seal population |
topic_facet |
Life Science |
description |
Terrestrial and marine wildlife populations have been severely reduced by hunting, fishing and habitat destruction, especially in the last centuries. Although management regulations have led to the recovery of some populations, the underlying processes are not always well understood. This study uses a 40-year time series of counts of harbour seals (Phoca vitulina) in the Wadden Sea to study these processes, and demonstrates the influence of historical regional differences in management regimes on the recovery of this population. While the Wadden Sea is considered one ecologically coupled zone, with a distinct harbour seal population, the area is divided into four geo-political regions i.e. the Netherlands, Lower Saxony including Hamburg, Schleswig-Holstein and Denmark. Gradually, seal hunting was banned between 1962 and 1977 in the different regions. Counts of moulting harbour seals and pup counts, obtained during aerial surveys between 1974 and 2014, show a population growth from approximately 4500 to 39,000 individuals. Population growth models were developed to assess if population growth differed between regions, taking into account two Phocine Distemper Virus (PDV) epizootics, in 1988 and 2002 which seriously affected the population. After a slow start prior to the first epizootic, the overall population grew exponentially at rates close to assumed maximum rates of increase in a harbour seal population. Recently, growth slowed down, potentially indicative of approaching carrying capacity. Regional differences in growth rates were demonstrated, with the highest recovery in Netherlands after the first PDV epizootic (i.e. 17.9%), suggesting that growth was fuelled by migration from the other regions, where growth remained at or below the intrinsic growth rate (13%). The seals’ distribution changed, and although the proportion of seals counted in the German regions declined, they remained by far the most important pupping region, with approximately 70% of all pups being born there. It is hypothesised that ... |
format |
Article in Journal/Newspaper |
author |
Brasseur, Sophie M.J.M. Reijnders, Peter J.H. Cremer, Jenny Meesters, Erik Kirkwood, Roger Jensen, Lasse Fast Jeβ, Armin Galatius, Anders Teilmann, Jonas Aarts, Geert |
author_facet |
Brasseur, Sophie M.J.M. Reijnders, Peter J.H. Cremer, Jenny Meesters, Erik Kirkwood, Roger Jensen, Lasse Fast Jeβ, Armin Galatius, Anders Teilmann, Jonas Aarts, Geert |
author_sort |
Brasseur, Sophie M.J.M. |
title |
Echoes from the past : Regional variations in recovery within a harbour seal population |
title_short |
Echoes from the past : Regional variations in recovery within a harbour seal population |
title_full |
Echoes from the past : Regional variations in recovery within a harbour seal population |
title_fullStr |
Echoes from the past : Regional variations in recovery within a harbour seal population |
title_full_unstemmed |
Echoes from the past : Regional variations in recovery within a harbour seal population |
title_sort |
echoes from the past : regional variations in recovery within a harbour seal population |
publishDate |
2018 |
url |
https://research.wur.nl/en/publications/echoes-from-the-past-regional-variations-in-recovery-within-a-har https://doi.org/10.1371/journal.pone.0189674 |
genre |
harbour seal Phoca vitulina |
genre_facet |
harbour seal Phoca vitulina |
op_source |
PLoS ONE 13 (2018) 1 ISSN: 1932-6203 |
op_relation |
https://edepot.wur.nl/431946 https://research.wur.nl/en/publications/echoes-from-the-past-regional-variations-in-recovery-within-a-har doi:10.1371/journal.pone.0189674 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research |
op_doi |
https://doi.org/10.1371/journal.pone.0189674 |
container_title |
PLOS ONE |
container_volume |
13 |
container_issue |
1 |
container_start_page |
e0189674 |
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1789333117506420736 |