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Keywords = Iberian harbour porpoise

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16 pages, 3262 KiB  
Article
Assessment of Harbour Porpoise Bycatch along the Portuguese and Galician Coast: Insights from Strandings over Two Decades
by Andreia Torres-Pereira, Hélder Araújo, Silvia Silva Monteiro, Marisa Ferreira, Jorge Bastos-Santos, Sara Sá, Lídia Nicolau, Ana Marçalo, Carina Marques, Ana Sofia Tavares, Myriam De Bonis, Pablo Covelo, José Martínez-Cedeira, Alfredo López, Marina Sequeira, José Vingada and Catarina Eira
Animals 2023, 13(16), 2632; https://doi.org/10.3390/ani13162632 - 15 Aug 2023
Cited by 9 | Viewed by 2651
Abstract
The Iberian harbour porpoise population is small and fisheries bycatch has been described as one of its most important threats. Data on harbour porpoise strandings collected by the Portuguese and Galician stranding networks between 2000 and 2020 are indicative of a recent mortality [...] Read more.
The Iberian harbour porpoise population is small and fisheries bycatch has been described as one of its most important threats. Data on harbour porpoise strandings collected by the Portuguese and Galician stranding networks between 2000 and 2020 are indicative of a recent mortality increase in the western Iberian coast (particularly in northern Portugal). Overall, in Portugal and Galicia, individuals stranded due to confirmed fishery interaction represented 46.98% of all analysed porpoises, and individuals stranded due to probable fishery interaction represented another 10.99% of all analysed porpoises. Considering the Portuguese annual abundance estimates available between 2011 and 2015, it was possible to calculate that an annual average of 207 individuals was removed from the population in Portuguese waters alone, which largely surpasses the potential biological removal (PBR) estimates (22 porpoises, CI: 12–43) for the same period. These results are conservative and bycatch values from strandings are likely underestimated. A structured action plan accounting for new activities at sea is needed to limit the Iberian porpoise population decline. Meanwhile, there is an urgent need for a fishing effort reorganization to directly decrease porpoise mortality. Full article
(This article belongs to the Section Aquatic Animals)
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21 pages, 2612 KiB  
Article
Harbour Porpoise Abundance in Portugal over a 5-Year Period and Estimates of Potential Distribution
by Andreia Torres-Pereira, Hélder Araújo, Fábio L. Matos, Jorge Bastos-Santos, Sara Sá, Marisa Ferreira, José Martínez-Cedeira, Alfredo López, Marina Sequeira, José Vingada and Catarina Eira
Animals 2022, 12(15), 1935; https://doi.org/10.3390/ani12151935 - 29 Jul 2022
Cited by 2 | Viewed by 4652
Abstract
The Iberian porpoise population is small and under potentially unsustainable removal by fisheries bycatch. Recently, a marine Site of Community Importance (SCI) was legally approved in Portugal, but no measures ensued to promote porpoise conservation. Information about porpoise abundance and distribution is fundamental [...] Read more.
The Iberian porpoise population is small and under potentially unsustainable removal by fisheries bycatch. Recently, a marine Site of Community Importance (SCI) was legally approved in Portugal, but no measures ensued to promote porpoise conservation. Information about porpoise abundance and distribution is fundamental to guide any future conservation measures. Annual aerial surveys conducted between 2011 and 2015 show a low overall porpoise abundance and density (2254 individuals; 0.090 ind/km2, CV = 21.99%) in the Portuguese coast. The highest annual porpoise estimates were registered in 2013 (3207 individuals, 0.128 ind/km2), followed by a sharp decrease in 2014 (1653 individuals, 0.066 ind/km2). The porpoise density and abundance estimated in 2015 remained lower than the 2013 estimates. A potential distribution analysis of the Iberian porpoise population was performed using ensembles of small models (ESMs) with MaxEnt and showed that the overall habitat suitability is particularly high in the Portuguese northern area. The analysis also suggested a different pattern in porpoise potential distribution across the study period. These results emphasize the importance of further porpoise population assessments to fully understand the spatial and temporal porpoise habitat use in the Iberian Peninsula as well as the urgent need for on-site threat mitigation measures. Full article
(This article belongs to the Section Mammals)
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