[MARMAM] New publication: Pathological findings in stranded harbor porpoises

IJsseldijk, L.L. (Lonneke) L.L.IJsseldijk at uu.nl
Tue Oct 11 01:10:14 PDT 2022

Dear all,

We are pleased to share our new publication: Pathological findings in stranded harbor porpoises (Phocoena phocoena) with special focus on anthropogenic causes.
IJsseldijk LL, Leopold MF, Begeman L, Kik MJL, Wiersma L, Morell M, Bravo Rebolledo EL, Jauniaux T, Heesterbeek H and Gröne A (2022).
Front. Mar. Sci. 9:997388. doi: 10.3389/fmars.2022.997388

Humans impact natural systems at an unprecedented rate. The North Sea is one of the regions in the world with the highest levels of anthropogenic activity. Here, the harbor porpoise (Phocoena phocoena) is an abundant species and is often regarded as an ecosystem sentinel. A post-mortem surveillance program was established in the Netherlands aimed at increasing knowledge of the effects of human activities on harbor porpoises. In this study, we describe the pathological findings related to anthropogenic and natural causes of death categories in 612 harbor porpoises that stranded between 2008 and 2019, and assess their relations to age, sex, season, and location. The largest anthropogenic category was bycatch (17%), with mainly juveniles affected and peak periods in March and September-October. Other, infrequently diagnosed anthropogenic causes of death were trauma (4%), largely most likely due to ship collisions, and marine debris ingestion and entanglement (0.3%). The risk of dying from anthropogenic causes was highest for juveniles. Lesions compatible with noise-induced hearing loss were investigated in carcasses which were fresh enough to do so (n = 50), with lesions apparent in two porpoises. Non-direct human-induced threats included infectious diseases, which were by far the largest cause of death category (32%), and affected mainly adults. Also, gray seal (Halichoerus grypus) attacks were a frequently assigned cause of death category (24%). There were more acute predation cases in the earlier study years, while porpoises with lesions that suggested escape from gray seal attacks were diagnosed more recently, which could suggest that porpoises adapted to this threat. Our study contributes to understanding porpoise health in response to persisting, new, emerging, and cumulative threats. Building up such knowledge is crucial for conservation management of this protected species.

This paper is open access and can be freely downloaded at: https://www.frontiersin.org/articles/10.3389/fmars.2022.997388/full

Kind regards,
Lonneke IJsseldijk,
Also on behalf of the co-authors

Lonneke L. IJsseldijk<https://www.uu.nl/medewerkers/LLIJsseldijk>, PhD | Assistant Professor | Project Manager Marine Mammal Stranding Research | Utrecht University | Veterinary<https://www.uu.nl/organisatie/faculteit-diergeneeskunde> Medicine | Biomolecular Health Sciences | Pathology | Yalelaan 1, 3584 CL Utrecht | room O.170 | +31 (0)30 2535312 | +31 (0)6 24455698 | l.l.ijsseldijk at uu.nl<mailto:l.l.ijsseldijk at uu.nl>| Follow us @ | Instagram<https://www.instagram.com/strandingresearch> | LinkedIn<https://www.linkedin.com/in/lonneke-ijsseldijk-64014226/> | Online<http://www.uu.nl/strandingsonderzoek>

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