An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years
Abstract The Baltic Proper harbor porpoise ( Phocoena phocoena ) is currently listed as critically endangered (CR), with the Static Acoustic Monitoring of the Baltic Sea Harbor Porpoise (SAMBAH) project concluding that only ~500 individuals remain. This population has a distribution that spans the w...
Published in: | Conservation Science and Practice |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/pdf/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/csp2.468 |
id |
crwiley:10.1111/csp2.468 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/csp2.468 2024-06-02T08:13:15+00:00 An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years Owen, Kylie Sköld, Martin Carlström, Julia Naturvårdsverket Havs- och Vattenmyndigheten 2021 http://dx.doi.org/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/pdf/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/csp2.468 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Conservation Science and Practice volume 3, issue 8 ISSN 2578-4854 2578-4854 journal-article 2021 crwiley https://doi.org/10.1111/csp2.468 2024-05-03T10:53:31Z Abstract The Baltic Proper harbor porpoise ( Phocoena phocoena ) is currently listed as critically endangered (CR), with the Static Acoustic Monitoring of the Baltic Sea Harbor Porpoise (SAMBAH) project concluding that only ~500 individuals remain. This population has a distribution that spans the waters of nine countries, making regular abundance estimates and management action challenging. Given the continued decline of other depleted porpoises, namely the vaquita ( Phocoena sinus ), the question is often raised about whether management action would even have a positive impact, or whether it is too late for population recovery. When abundance estimates are sparse over time, monitoring programs at key sites are likely to serve as the best indication of population trends, and may provide an early indication of changes at the population level. We compared passive acoustic monitoring data from 12 stations that were utilized both in the SAMBAH project (2011–2013) and as a part of the Swedish National Monitoring Program (2017–2020) to determine trends in detection rates. There was a 29% increase in mean daily detection rate during May–October (over the breeding season) between the two study periods. At the three stations with the highest number of detections, log linear regression revealed a yearly increase of 2.4% between 2011 and 2019 (−4.4–9.6, 95% CI). This may be indicative of the beginnings of population recovery, or simply an indication that the decline has stalled. The rate of increase is still well below what is likely to be possible for porpoise populations, and unlikely to buffer against any potential increase in pressures in the future. We therefore call for urgent management action to remove threats and protect this CR population, the only resident cetacean in the Baltic region, in order to give it the best chance of recovery. Article in Journal/Newspaper Phocoena phocoena Wiley Online Library Conservation Science and Practice 3 8 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The Baltic Proper harbor porpoise ( Phocoena phocoena ) is currently listed as critically endangered (CR), with the Static Acoustic Monitoring of the Baltic Sea Harbor Porpoise (SAMBAH) project concluding that only ~500 individuals remain. This population has a distribution that spans the waters of nine countries, making regular abundance estimates and management action challenging. Given the continued decline of other depleted porpoises, namely the vaquita ( Phocoena sinus ), the question is often raised about whether management action would even have a positive impact, or whether it is too late for population recovery. When abundance estimates are sparse over time, monitoring programs at key sites are likely to serve as the best indication of population trends, and may provide an early indication of changes at the population level. We compared passive acoustic monitoring data from 12 stations that were utilized both in the SAMBAH project (2011–2013) and as a part of the Swedish National Monitoring Program (2017–2020) to determine trends in detection rates. There was a 29% increase in mean daily detection rate during May–October (over the breeding season) between the two study periods. At the three stations with the highest number of detections, log linear regression revealed a yearly increase of 2.4% between 2011 and 2019 (−4.4–9.6, 95% CI). This may be indicative of the beginnings of population recovery, or simply an indication that the decline has stalled. The rate of increase is still well below what is likely to be possible for porpoise populations, and unlikely to buffer against any potential increase in pressures in the future. We therefore call for urgent management action to remove threats and protect this CR population, the only resident cetacean in the Baltic region, in order to give it the best chance of recovery. |
author2 |
Naturvårdsverket Havs- och Vattenmyndigheten |
format |
Article in Journal/Newspaper |
author |
Owen, Kylie Sköld, Martin Carlström, Julia |
spellingShingle |
Owen, Kylie Sköld, Martin Carlström, Julia An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
author_facet |
Owen, Kylie Sköld, Martin Carlström, Julia |
author_sort |
Owen, Kylie |
title |
An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
title_short |
An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
title_full |
An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
title_fullStr |
An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
title_full_unstemmed |
An increase in detection rates of the critically endangered Baltic Proper harbor porpoise in Swedish waters in recent years |
title_sort |
increase in detection rates of the critically endangered baltic proper harbor porpoise in swedish waters in recent years |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/pdf/10.1111/csp2.468 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/csp2.468 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Conservation Science and Practice volume 3, issue 8 ISSN 2578-4854 2578-4854 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/csp2.468 |
container_title |
Conservation Science and Practice |
container_volume |
3 |
container_issue |
8 |
_version_ |
1800736690687442944 |