Sowerby’s Beaked Whales (Mesoplodon bidens) in the Skagerrak and Adjacent Waters: Historical Records and Recent Post-Mortem Findings

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Stavenow, JasmineStatens Veterinärmedicinska Anstalt, SVA (author)

Sowerby’s Beaked Whales (Mesoplodon bidens) in the Skagerrak and Adjacent Waters: Historical Records and Recent Post-Mortem Findings

Article/chapterEnglish2022

Publisher, publication year, extent ...

2022-06-23
MDPI AG,2022
electronicrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:nrm-4775
https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4775URI
https://doi.org/10.3390/oceans3030018DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

In contrast to sparse historical observational records, five Sowerby’s beaked whales (SBW) stranded and died in Swedish waters between 2015 and 2020. Here we summarize historical records of SBWs in the Skagerrak basin and adjacent waters. The three recent stranding events from Sweden are described, and the post-mortem findings, including diet analysis, from the five SBWs are presented. Of 30 historical records of SBWs observations since 1869, 13 (43%) were documented between 2010 and 2021, and records between July and November were the most frequent. The recent stranding events occurred in October 2015 (n = 1), August 2019 (n = 3) and July 2020 (n = 1). Four of the SBWs were examined through necropsy, and one was sampled in the field. They were all sub-adults and included a single female and four males. The causes of death were emaciation, euthanasia due to traumatic injury, and live stranding of undetermined cause. Two SBWs each had a focal bone lesion consistent with osteomyelitis. Other findings included pox-like dermatitis, trauma, focal granulomas in a lymph node and intestine, and ulceration of the stomach. CT scans were performed on the heads of two animals, with inconclusive results. Three SBWs had hard parts in the gastrointestinal tract that mainly consisted of otoliths from several fish species. An eDNA-analysis confirmed and supplemented the diet analysis, revealing 17 fish species in total, including species not previously described as prey for SBW, such as Pleuronectidae spp. The apparent increase in observational records since 2010 may indicate a shift in SBW distribution or changing threats to these animals. Our results support and expand theories on SBW movements and provide data on the biology and health of this poorly known species, which are valuable for conservation and legislation efforts.

Subject headings and genre

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
NATURVETENSKAP Biologi Zoologi hsv//swe
NATURAL SCIENCES Biological Sciences Zoology hsv//eng
LANTBRUKSVETENSKAPER Veterinärmedicin hsv//swe
AGRICULTURAL SCIENCES Veterinary Science hsv//eng
Man and the environment
Naturmiljö och människan

Added entries (persons, corporate bodies, meetings, titles ...)

Roos, Anna MariaNaturhistoriska riksmuseet,Enheten för miljöforskning och övervakning (author)
Ågren, Erik OlofStatens Veterinärmedicinska Anstalt, SVA (author)
Kinze, Carl (author)
Englund, William F.Naturhistoriska riksmuseet,Enheten för miljöforskning och övervakning (author)
Neimanis, AleksijaStatens Veterinärmedicinska Anstalt, SVA (author)
Statens Veterinärmedicinska Anstalt, SVAEnheten för miljöforskning och övervakning (creator_code:org_t)

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In:Oceans: MDPI AG3:3, s. 250-2672673-1924

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Zoology

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