Opin vísindi

First estimates of entanglement rate of humpback whales Megaptera novaeangliae observed in coastal Icelandic waters

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Basran, CJ
dc.contributor.author Bertulli, CG
dc.contributor.author Cecchetti, A
dc.contributor.author Rasmussen, Marianne
dc.contributor.author Whittaker, M
dc.contributor.author Robbins, J
dc.date.accessioned 2020-10-07T11:08:49Z
dc.date.available 2020-10-07T11:08:49Z
dc.date.issued 2019-02-07
dc.identifier.citation Basran CJ, Bertulli CG, Cecchetti A, Rasmussen MH, Whittaker M, Robbins J (2019) First estimates of entanglement rate of humpback whales Megaptera novaeangliae observed in coastal Icelandic waters. Endang Species Res 38:67-77. https://doi.org/10.3354/esr00936
dc.identifier.issn 1863-5407
dc.identifier.issn 1613-4796 (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/2098
dc.description Publisher's version (útgefin grein)
dc.description.abstract Entanglement in fishing gear is a significant anthropogenic source of large whale injury and mortality. Although entanglements have been reported in the eastern North Atlantic, their frequency has not been previously estimated. This study used systematic scar analysis to estimate the frequency of non-lethal entanglements among individual humpback whales Megaptera novaeangliae off coastal Iceland, from 2005 through 2017. Images of the caudal peduncle and fluke insertions of 379 individuals were analyzed for wrapping injuries and notches known to be indicative of entanglement. The results indicated that at least 24.8% (n = 94, 95% confidence intervals [95% CI]: 20.5-29.1%) of individuals had a history of prior entanglement when first encountered. Depending on the metric used, the whales subsequently acquired new entanglement-related injuries at an average rate of 1.9% (95% CI: 0.6-3.2%) or 16.3% (95% CI: 3.0-29.3%) per year, with no statistically significant change over time. Furthermore, evidence suggests that at least some entanglements occurred locally. Observations of whales with gear still entangling the body confirmed the patterns of injury studied here. These results are lower than scar-based estimates from other parts of the world, but the cause of this difference requires further study. Scar-based methods underestimate the frequency of prior entanglement because some injuries heal beyond recognition, do not involve the caudal peduncle, and may occur on whales that die before they are studied. Long-term monitoring of humpback whale entanglement in Icelandic coastal waters is important for evaluating the local effects of fisheries, as well as the viability of the endangered Cape Verde breeding population.
dc.description.sponsorship This work was funded in part by a National Geographic Explorer Grant awarded by the National Geographic Society, a PhD sponsorship grant awarded by Gentle Giants Whale Watching, and a Doctoral Grant awarded by Rannís Icelandic Research Fund. We thank all the students at the University of Iceland’s Húsavík Research Center for contributing data, the Faxaflói Ceta - cean Research volunteers (in Húsavík and Reykjavík), and all the whale-watching companies in Iceland who showed interest in the project and contributed photographs and/or space onboard their vessels for data collection. Furthermore, we thank the anonymous reviewers, who provided valuable input into the manuscript. Photographs used in the figures are copyright of University of Iceland (Figs. 2,3,4a1,b,c, 5 & 6a,b,d) Elding Adventures at Sea (Fig. 6c), and Charlie Frank Lavin (Elding Whale Watching Akureyri) (Fig. 4a2).
dc.format.extent 67-77
dc.language.iso en
dc.publisher Inter-Research Science Center
dc.relation.ispartofseries Endangered Species Research;38
dc.rights info:eu-repo/semantics/openAccess
dc.subject Entanglement
dc.subject Humpback whales
dc.subject Iceland
dc.subject Megaptera novaeangliae
dc.subject North Atlantic
dc.subject Scar analysis
dc.subject Hnúfubakur
dc.subject Norður-Atlantshaf
dc.subject Netaveiðar
dc.title First estimates of entanglement rate of humpback whales Megaptera novaeangliae observed in coastal Icelandic waters
dc.type info:eu-repo/semantics/article
dcterms.license Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un - restricted. Authors and original publication must be credited.
dc.description.version Peer Reviewed
dc.identifier.journal Endangered Species Research
dc.identifier.doi 10.3354/ESR00936
dc.relation.url https://www.int-res.com/articles/esr2019/38/n038p067.pdf
dc.contributor.department Líf- og umhverfisvísindadeild (HÍ)
dc.contributor.department Faculty of Life and Environmental Sciences (UI)
dc.contributor.department Rannsóknasetur á Húsavík (HÍ)
dc.contributor.department Research Centre in Húsavík (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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