Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results
During recent decades, the 2 distinct harbour porpoise populations of the Baltic Sea have decreased sharply in abundance. The Baltic Proper population is down to a few hundred individuals and is regarded as ‘Critically Endangered’ by IUCN; the more abundant Belt Sea population also appears to have e...
Published in: | Marine Ecology Progress Series |
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ftubkonstanz:oai:kops.uni-konstanz.de:123456789/50847 2024-02-11T10:04:33+01:00 Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results Benke, Harald Bräger, Stefan Dähne, Michael Gallus, Anja Hansen, Sophie Honnef, Christopher G. Jabbusch, Martin Koblitz, Jens C. Krügel, Kathrin Liebschner, Alexander 2014-01-09 application/pdf http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1xgt0e9kv7if00 https://doi.org/10.3354/meps10538 eng eng http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1xgt0e9kv7if00 http://dx.doi.org/10.3354/meps10538 1806144506 http://creativecommons.org/licenses/by/4.0/ Marine Ecology Progress Series. Inter-Research. 2014, 495, pp. 275-290. ISSN 0171-8630. eISSN 1616-1599. Available under: doi:10.3354/meps10538 Acoustic monitoring Baltic Sea Distribution patterns Generalized Additive Mixed Model Phocoena phocoena Population status Seasonal movements ddc:570 doc-type:article doc-type:Text 2014 ftubkonstanz https://doi.org/10.3354/meps10538 2024-01-21T23:55:09Z During recent decades, the 2 distinct harbour porpoise populations of the Baltic Sea have decreased sharply in abundance. The Baltic Proper population is down to a few hundred individuals and is regarded as ‘Critically Endangered’ by IUCN; the more abundant Belt Sea population also appears to have experienced a severe decline. We summarize the results of extensive static acoustic monitoring in the German part of the Baltic Sea and compare them to published results of aerial and acoustic surveys. Acoustic monitoring confirmed seasonal changes in detection rates consistent with proposed east–west migrations. Detection rates, and thus presumably porpoise density, decrease from west to east from a long-term mean (2002 to 2012) of 94% detection-positive days per month (DPD mo-1) around the island of Fehmarn and 71% DPD mo-1 in Kadet Trench to 4.4% DPD mo-1 in Pomeranian Bay as one crosses the putative population boundary. Acoustic monitoring results show a recent increase in porpoise registration rates in the Kadet Trench and in Pomeranian Bay, although this does not necessarily indicate a population increase. This large dataset supports the previously suggested proposition that each population uses the boundary waters in Pomeranian Bay alternately, leading to the presence of registration peaks in (late) summer by Belt Sea porpoises, and in winter by Baltic Proper animals. The critical status of porpoises in the Baltic Sea highlights the urgent need for protective measures which still await national and international implementation. published published Article in Journal/Newspaper Harbour porpoise Phocoena phocoena KOPS - The Institutional Repository of the University of Konstanz Marine Ecology Progress Series 495 275 290 |
institution |
Open Polar |
collection |
KOPS - The Institutional Repository of the University of Konstanz |
op_collection_id |
ftubkonstanz |
language |
English |
topic |
Acoustic monitoring Baltic Sea Distribution patterns Generalized Additive Mixed Model Phocoena phocoena Population status Seasonal movements ddc:570 |
spellingShingle |
Acoustic monitoring Baltic Sea Distribution patterns Generalized Additive Mixed Model Phocoena phocoena Population status Seasonal movements ddc:570 Benke, Harald Bräger, Stefan Dähne, Michael Gallus, Anja Hansen, Sophie Honnef, Christopher G. Jabbusch, Martin Koblitz, Jens C. Krügel, Kathrin Liebschner, Alexander Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
topic_facet |
Acoustic monitoring Baltic Sea Distribution patterns Generalized Additive Mixed Model Phocoena phocoena Population status Seasonal movements ddc:570 |
description |
During recent decades, the 2 distinct harbour porpoise populations of the Baltic Sea have decreased sharply in abundance. The Baltic Proper population is down to a few hundred individuals and is regarded as ‘Critically Endangered’ by IUCN; the more abundant Belt Sea population also appears to have experienced a severe decline. We summarize the results of extensive static acoustic monitoring in the German part of the Baltic Sea and compare them to published results of aerial and acoustic surveys. Acoustic monitoring confirmed seasonal changes in detection rates consistent with proposed east–west migrations. Detection rates, and thus presumably porpoise density, decrease from west to east from a long-term mean (2002 to 2012) of 94% detection-positive days per month (DPD mo-1) around the island of Fehmarn and 71% DPD mo-1 in Kadet Trench to 4.4% DPD mo-1 in Pomeranian Bay as one crosses the putative population boundary. Acoustic monitoring results show a recent increase in porpoise registration rates in the Kadet Trench and in Pomeranian Bay, although this does not necessarily indicate a population increase. This large dataset supports the previously suggested proposition that each population uses the boundary waters in Pomeranian Bay alternately, leading to the presence of registration peaks in (late) summer by Belt Sea porpoises, and in winter by Baltic Proper animals. The critical status of porpoises in the Baltic Sea highlights the urgent need for protective measures which still await national and international implementation. published published |
format |
Article in Journal/Newspaper |
author |
Benke, Harald Bräger, Stefan Dähne, Michael Gallus, Anja Hansen, Sophie Honnef, Christopher G. Jabbusch, Martin Koblitz, Jens C. Krügel, Kathrin Liebschner, Alexander |
author_facet |
Benke, Harald Bräger, Stefan Dähne, Michael Gallus, Anja Hansen, Sophie Honnef, Christopher G. Jabbusch, Martin Koblitz, Jens C. Krügel, Kathrin Liebschner, Alexander |
author_sort |
Benke, Harald |
title |
Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
title_short |
Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
title_full |
Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
title_fullStr |
Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
title_full_unstemmed |
Baltic Sea harbour porpoise populations : status and conservation needs derived from recent survey results |
title_sort |
baltic sea harbour porpoise populations : status and conservation needs derived from recent survey results |
publishDate |
2014 |
url |
http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1xgt0e9kv7if00 https://doi.org/10.3354/meps10538 |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
Marine Ecology Progress Series. Inter-Research. 2014, 495, pp. 275-290. ISSN 0171-8630. eISSN 1616-1599. Available under: doi:10.3354/meps10538 |
op_relation |
http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1xgt0e9kv7if00 http://dx.doi.org/10.3354/meps10538 1806144506 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3354/meps10538 |
container_title |
Marine Ecology Progress Series |
container_volume |
495 |
container_start_page |
275 |
op_container_end_page |
290 |
_version_ |
1790601186826518528 |