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March 7, 2024Frontiers in Marine ScienceOpen Access

A negative trend in abundance and an exceeded mortality limit call for conservation action for the Vulnerable Belt Sea harbour porpoise population

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Authors

KOKylie OwenAGAnita GillesMAMatthieu Authier

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Overview

Distance sampling surveys demonstrate sharp abundance declines in Belt Sea harbour porpoises, highlighting unsustainable fishery bycatch and urgent conservation needs.

Key Points

  • Belt Sea harbour porpoise abundance declined at 2.7% per year between 2005 and 2022 with a 90.5% probability, demonstrating an ongoing reduction in numbers.
  • Annual bycatch reaches approximately 900 porpoises across commercial fleets, substantially exceeding the calculated mortality limit of 24 animals.
  • Line-transect distance sampling and modified potential biological removal modeling reveal unsustainable losses, calling for urgent conservation measures.

Cite This Study

Owen et al. (2024) studied this question.

synapsesocial.com/papers/68e7542bb6db6435876cc016https://doi.org/10.3389/fmars.2024.1289808
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Also Consider

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  4. 4Spatial Priorities for Protecting the Black Sea Harbour Porpoise: Abundance and Habitat Suitability in Bulgarian Waters2026
  5. 5Harbour porpoise (Phocoena phocoena) in the Wadden Sea World Heritage Site and requirements for trilateral monitoring2024 · 2 citations