Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022
To obtain an estimate of the number of harbour seals and pups hauled out in the entire Wadden Sea area (including Helgoland), counts are synchronized between the three Wadden Sea countries, Denmark, Germany and the Netherlands. Harbour seals are counted when hauling out on land and counts are schedu...
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ftzenodo:oai:zenodo.org:8272985 2023-09-26T15:18:38+02:00 Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 Anders Galatius Sophie Brasseur Florian Carius Armin Jeß Kristine Meise Julia Meyer Jessica Schop Ursula Siebert Ole Stejskal Jonas Teilmann Charlotte B. Thøstesen 2022-11-04 https://zenodo.org/record/8272985 https://doi.org/10.5281/zenodo.8272985 eng eng doi:10.5281/zenodo.8272984 https://zenodo.org/record/8272985 https://doi.org/10.5281/zenodo.8272985 oai:zenodo.org:8272985 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Biodiversity Conservation Monitoring Scientific research Seals management info:eu-repo/semantics/report publication-report 2022 ftzenodo https://doi.org/10.5281/zenodo.827298510.5281/zenodo.8272984 2023-08-29T23:03:54Z To obtain an estimate of the number of harbour seals and pups hauled out in the entire Wadden Sea area (including Helgoland), counts are synchronized between the three Wadden Sea countries, Denmark, Germany and the Netherlands. Harbour seals are counted when hauling out on land and counts are scheduled to be carried out when low tide occurs around midday. The five counts are scheduled around five dates to describe pup production and moult numbers accurately. Three counts are aimed at pup numbers during the pupping season in June and two during the moulting season in August aim to obtain an estimate of the population size and its fluctuations. The observed variation in the number of seals hauling out may be 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). Also, the timing of birth has been shown to change over time, potentially affecting the percentage of pups counted at the same time each year over a long period (Reijnders et al. 2010). Though efforts are made to maximise the standardisation of the surveys with respect to weather, tides and dates, changes could influence the counts. Additional studies are needed to ascertain when the peak in birth and moult occurs. Report harbour seal Zenodo Helgoland Härkönen ENVELOPE(29.500,29.500,66.083,66.083) |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
English |
topic |
Biodiversity Conservation Monitoring Scientific research Seals management |
spellingShingle |
Biodiversity Conservation Monitoring Scientific research Seals management Anders Galatius Sophie Brasseur Florian Carius Armin Jeß Kristine Meise Julia Meyer Jessica Schop Ursula Siebert Ole Stejskal Jonas Teilmann Charlotte B. Thøstesen Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
topic_facet |
Biodiversity Conservation Monitoring Scientific research Seals management |
description |
To obtain an estimate of the number of harbour seals and pups hauled out in the entire Wadden Sea area (including Helgoland), counts are synchronized between the three Wadden Sea countries, Denmark, Germany and the Netherlands. Harbour seals are counted when hauling out on land and counts are scheduled to be carried out when low tide occurs around midday. The five counts are scheduled around five dates to describe pup production and moult numbers accurately. Three counts are aimed at pup numbers during the pupping season in June and two during the moulting season in August aim to obtain an estimate of the population size and its fluctuations. The observed variation in the number of seals hauling out may be 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). Also, the timing of birth has been shown to change over time, potentially affecting the percentage of pups counted at the same time each year over a long period (Reijnders et al. 2010). Though efforts are made to maximise the standardisation of the surveys with respect to weather, tides and dates, changes could influence the counts. Additional studies are needed to ascertain when the peak in birth and moult occurs. |
format |
Report |
author |
Anders Galatius Sophie Brasseur Florian Carius Armin Jeß Kristine Meise Julia Meyer Jessica Schop Ursula Siebert Ole Stejskal Jonas Teilmann Charlotte B. Thøstesen |
author_facet |
Anders Galatius Sophie Brasseur Florian Carius Armin Jeß Kristine Meise Julia Meyer Jessica Schop Ursula Siebert Ole Stejskal Jonas Teilmann Charlotte B. Thøstesen |
author_sort |
Anders Galatius |
title |
Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
title_short |
Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
title_full |
Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
title_fullStr |
Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
title_full_unstemmed |
Harbour Seal Numbers in the Wadden Sea and on Helgoland in 2022 |
title_sort |
harbour seal numbers in the wadden sea and on helgoland in 2022 |
publishDate |
2022 |
url |
https://zenodo.org/record/8272985 https://doi.org/10.5281/zenodo.8272985 |
long_lat |
ENVELOPE(29.500,29.500,66.083,66.083) |
geographic |
Helgoland Härkönen |
geographic_facet |
Helgoland Härkönen |
genre |
harbour seal |
genre_facet |
harbour seal |
op_relation |
doi:10.5281/zenodo.8272984 https://zenodo.org/record/8272985 https://doi.org/10.5281/zenodo.8272985 oai:zenodo.org:8272985 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.827298510.5281/zenodo.8272984 |
_version_ |
1778141225300262912 |