2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020
To obtain annual estimates of the number of harbour seals and newborn pups in the entire Wadden Sea and Helgoland, seal counts are synchronized to the degree possible between the three Wadden Sea countries: Denmark, Germany and the Netherlands. Seals are counted when hauling out on land and counts a...
Main Authors: | , , , , , , , , , , , |
---|---|
Format: | Report |
Language: | English |
Published: |
Zenodo
2020
|
Subjects: | |
Online Access: | https://doi.org/10.5281/zenodo.8208026 |
id |
ftzenodo:oai:zenodo.org:8208026 |
---|---|
record_format |
openpolar |
spelling |
ftzenodo:oai:zenodo.org:8208026 2024-09-15T18:10:45+00:00 2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 Anders Galatius Jens Brackmann Sophie Brasseur Britta Diederichs Armin Jeß Sascha Klöpper Peter Körber Jessica Schop Ursula Siebert Jonas Teilmann Charlotte B. Thøstesen Britta Schmidt 2020-11-09 https://doi.org/10.5281/zenodo.8208026 eng eng Zenodo https://doi.org/10.5281/zenodo.8208025 https://doi.org/10.5281/zenodo.8208026 oai:zenodo.org:8208026 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Biodiversity Conservation Monitoring Scientific research Management info:eu-repo/semantics/report 2020 ftzenodo https://doi.org/10.5281/zenodo.820802610.5281/zenodo.8208025 2024-07-26T05:18:56Z To obtain annual estimates of the number of harbour seals and newborn pups in the entire Wadden Sea and Helgoland, seal counts are synchronized to the degree possible between the three Wadden Sea countries: Denmark, Germany and the Netherlands. Seals are counted when hauling out on land and counts are scheduled to be carried out when low tide occurs around midday. The number of seals hauling out is affected by different weather conditions, disturbance, distance to food patches, or a change in the age and sex composition of the population (Härkönen et al. 1999). This may lead to variation in counts from year to year and potentially over several years. Also, during 1974-2009, the timing of birth shifted towards an earlier maximum pupping date, potentially affecting the percentage of pups counted at the same time of year over a long period (Reijnders et al. 2010). Report harbour seal Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
English |
topic |
Biodiversity Conservation Monitoring Scientific research Management |
spellingShingle |
Biodiversity Conservation Monitoring Scientific research Management Anders Galatius Jens Brackmann Sophie Brasseur Britta Diederichs Armin Jeß Sascha Klöpper Peter Körber Jessica Schop Ursula Siebert Jonas Teilmann Charlotte B. Thøstesen Britta Schmidt 2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
topic_facet |
Biodiversity Conservation Monitoring Scientific research Management |
description |
To obtain annual estimates of the number of harbour seals and newborn pups in the entire Wadden Sea and Helgoland, seal counts are synchronized to the degree possible between the three Wadden Sea countries: Denmark, Germany and the Netherlands. Seals are counted when hauling out on land and counts are scheduled to be carried out when low tide occurs around midday. The number of seals hauling out is affected by different weather conditions, disturbance, distance to food patches, or a change in the age and sex composition of the population (Härkönen et al. 1999). This may lead to variation in counts from year to year and potentially over several years. Also, during 1974-2009, the timing of birth shifted towards an earlier maximum pupping date, potentially affecting the percentage of pups counted at the same time of year over a long period (Reijnders et al. 2010). |
format |
Report |
author |
Anders Galatius Jens Brackmann Sophie Brasseur Britta Diederichs Armin Jeß Sascha Klöpper Peter Körber Jessica Schop Ursula Siebert Jonas Teilmann Charlotte B. Thøstesen Britta Schmidt |
author_facet |
Anders Galatius Jens Brackmann Sophie Brasseur Britta Diederichs Armin Jeß Sascha Klöpper Peter Körber Jessica Schop Ursula Siebert Jonas Teilmann Charlotte B. Thøstesen Britta Schmidt |
author_sort |
Anders Galatius |
title |
2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
title_short |
2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
title_full |
2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
title_fullStr |
2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
title_full_unstemmed |
2020 Harbour seal report: Trilateral surveys of Harbour Seals in the Wadden Sea and Helgoland in 2020 |
title_sort |
2020 harbour seal report: trilateral surveys of harbour seals in the wadden sea and helgoland in 2020 |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.5281/zenodo.8208026 |
genre |
harbour seal |
genre_facet |
harbour seal |
op_relation |
https://doi.org/10.5281/zenodo.8208025 https://doi.org/10.5281/zenodo.8208026 oai:zenodo.org:8208026 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.820802610.5281/zenodo.8208025 |
_version_ |
1810448337839587328 |