Beached bachelors: An extensive study on the largest recorded sperm whale Physeter macrocephalus mortality event in the North Sea

Hyrenbach, David, IJsseldijk, Lonneke L., van Neer, Abbo, Deaville, Rob, Begeman, Lineke, van de Bildt, Marco, van den Brand, Judith M. A., Brownlow, Andrew, Czeck, Richard, Dabin, Willy, ten Doeschate, Mariel, Herder, Vanessa, Herr, Helena, IJzer, Jooske, Jauniaux, Thierry, Jensen, Lasse Fast, Jepson, Paul D., Jo, Wendy Karen, Lakemeyer, Jan, Lehnert, Kristina, Leopold, Mardik F., Osterhaus, Albert, Perkins, Matthew W., Piatkowski, Uwe, Prenger-Berninghoff, Ellen, Pund, Ralf, Wohlsein, Peter, Gröne, Andrea and Siebert, Ursula (2018) Beached bachelors: An extensive study on the largest recorded sperm whale Physeter macrocephalus mortality event in the North Sea PLoS ONE, 13 (8). e0201221. DOI 10.1371/journal.pone.0201221.

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Between the 8th January and the 25th February 2016, the largest sperm whale Physeter macrocephalus mortality event ever recorded in the North Sea occurred with 30 sperm whales stranding in five countries within six weeks. All sperm whales were immature males. Groups were stratified by size, with the smaller animals stranding in the Netherlands, and the largest in England. The majority (n = 27) of the stranded animals were necropsied and/or sampled, allowing for an international and comprehensive investigation into this mortality event. The animals were in fair to good nutritional condition and, aside from the pathologies caused by stranding, did not exhibit significant evidence of disease or trauma. Infectious agents were found, including various parasite species, several bacterial and fungal pathogens and a novel alphaherpesvirus. In nine of the sperm whales a variety of marine litter was found. However, none of these findings were considered to have been the primary cause of the stranding event. Potential anthropogenic and environmental factors that may have caused the sperm whales to enter the North Sea were assessed. Once sperm whales enter the North Sea and head south, the water becomes progressively shallower (<40 m), making this region a global hotspot for sperm whale strandings. We conclude that the reasons for sperm whales to enter the southern North Sea are the result of complex interactions of extrinsic environmental factors. As such, these large mortality events seldom have a single ultimate cause and it is only through multidisciplinary, collaborative approaches that potentially multifactorial large-scale stranding events can be effectively investigated.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
DOI etc.: 10.1371/journal.pone.0201221
ISSN: 1932-6203
Date Deposited: 24 Aug 2018 13:19
Last Modified: 24 Aug 2018 13:19

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