Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring

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2022
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Amundin, Mats
Carlström, Julia
Thomas, Len
Carlén, Ida
Teilmann, Jonas
Tougaard, Jakob
Loisa, Olli
Kyhn, Line A.
Sveegaard, Signe
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Ecology and Evolution. Wiley. 2022, 12(2), e8554. eISSN 2045-7758. Available under: doi: 10.1002/ece3.8554
Zusammenfassung

Knowing the abundance of a population is a crucial component to assess its conservation status and develop effective conservation plans. For most cetaceans, abundance estimation is difficult given their cryptic and mobile nature, especially when the population is small and has a transnational distribution. In the Baltic Sea, the number of harbour porpoises (Phocoena phocoena) has collapsed since the mid-20th century and the Baltic Proper harbour porpoise is listed as Critically Endangered by the IUCN and HELCOM; however, its abundance remains unknown. Here, one of the largest ever passive acoustic monitoring studies was carried out by eight Baltic Sea nations to estimate the abundance of the Baltic Proper harbour porpoise for the first time. By logging porpoise echolocation signals at 298 stations during May 2011-April 2013, calibrating the loggers' spatial detection performance at sea, and measuring the click rate of tagged individuals, we estimated an abundance of 71-1105 individuals (95% CI, point estimate 491) during May-October within the population's proposed management border. The small abundance estimate strongly supports that the Baltic Proper harbour porpoise is facing an extremely high risk of extinction, and highlights the need for immediate and efficient conservation actions through international cooperation. It also provides a starting point in monitoring the trend of the population abundance to evaluate the effectiveness of management measures and determine its interactions with the larger neighboring Belt Sea population. Further, we offer evidence that design-based passive acoustic monitoring can generate reliable estimates of the abundance of rare and cryptic animal populations across large spatial scales.

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570 Biowissenschaften, Biologie
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abundance estimation, C-POD, detection function, passive acoustic monitoring, Phocoena phocoena
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ISO 690AMUNDIN, Mats, Julia CARLSTRÖM, Len THOMAS, Ida CARLÉN, Jonas TEILMANN, Jakob TOUGAARD, Olli LOISA, Line A. KYHN, Signe SVEEGAARD, Jens C. KOBLITZ, 2022. Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring. In: Ecology and Evolution. Wiley. 2022, 12(2), e8554. eISSN 2045-7758. Available under: doi: 10.1002/ece3.8554
BibTex
@article{Amundin2022-02Estim-57016,
  year={2022},
  doi={10.1002/ece3.8554},
  title={Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring},
  number={2},
  volume={12},
  journal={Ecology and Evolution},
  author={Amundin, Mats and Carlström, Julia and Thomas, Len and Carlén, Ida and Teilmann, Jonas and Tougaard, Jakob and Loisa, Olli and Kyhn, Line A. and Sveegaard, Signe and Koblitz, Jens C.},
  note={Article Number: e8554}
}
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