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Marine Ecology Progress Series

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MEPS 658:219-236 (2021)  -  DOI:

Spatial use of multiple jurisdictions by Magellanic penguins and assessment of potential conflicts in the face of changing trawl fisheries scenarios

Pablo Yorio1,2,*, Nicolás Suárez1, Patricia Dell’Arciprete1, Cristian Marinao1, María Eva Góngora3, Lorien Pichegru4, Laura Prosdocimi5, Tatiana Kasinsky1

1Centro Para el Estudio de Sistemas Marinos, CONICET, Puerto Madryn 9120, Chubut, Argentina
2Wildlife Conservation Society Argentina, Ciudad Autónoma de Buenos Aires 1426, Argentina
3Instituto de Hidrobiología, Universidad Nacional de la Patagonia San Juan Bosco, Trelew 9100, Chubut, Argentina
4DST-NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, Institute for Coastal and Marine Research, Nelson Mandela University, 6031 Port Elizabeth, South Africa
5Subsecretaría de Pesca y Acuicultura, Ciudad Autónoma de Buenos Aires 1063, Argentina
*Corresponding author:

ABSTRACT: Seabirds often have wide distribution ranges and may travel relatively long distances to breeding grounds, often crossing jurisdictional boundaries. When engaged in foraging behaviour, seabirds are prone to interact with different fisheries and suffer incidental mortality. We assessed the spatial use of foraging Magellanic penguins Spheniscus magellanicus breeding at 3 colonies within the Patagonia Austral Marine Park (San Jorge Gulf, Argentina) in relation to different jurisdictions. We also quantified their spatial overlap with 3 trawl fisheries and bycatch (incidental mortality), an interaction previously reported in the region. Breeding Magellanic penguins mainly used waters under provincial jurisdiction within the gulf, with some use of federal waters depending on the breeding season and colony location. Spatial use by breeding penguins resulted in a variable but relatively low overlap with the operations of the 3 fishing fleets in 2014-2016 (1.1-26.3%). Changes in the spatial distribution of fishing operations in recent years resulted in a lower overlap than in 2005-2007 (12.1-60.8%). Incidental mortality during 2008-2014 was also variable and relatively low (0.0-0.363 birds per haul). Breeding Magellanic penguins foraged outside protected area boundaries where they can spatially overlap with and face potential threats from different fishing fleets that operate in waters of provincial and/or federal jurisdiction. Despite the current low spatial overlap, the relatively fast changes in fishing patterns in the recent past draw attention to the need for continuous monitoring. Data obtained in this study may prove valuable in case the implementation of spatial and temporal closures of fishing operations is needed.

KEY WORDS: Magellanic penguin · Spheniscus magellanicus · Trawl fisheries · Multiple jurisdictions · Spatial conflicts · Incidental mortality · Argentina

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Cite this article as: Yorio P, Suárez N, Dell\'Arciprete P, Marinao C and others (2021) Spatial use of multiple jurisdictions by Magellanic penguins and assessment of potential conflicts in the face of changing trawl fisheries scenarios. Mar Ecol Prog Ser 658:219-236.

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