Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery

Abstract The incidental capture of wildlife in fishing gear presents a global conservation challenge. As a baseline to inform assessments of the impact of bycatch on bottlenose dolphins (Tursiops truncatus) interacting with an Australian trawl fishery, we conducted an aerial survey to estimate dolph...

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Autores principales:	Simon J. Allen, Kenneth H. Pollock, Phil J. Bouchet, Halina T. Kobryn, Deirdre B. McElligott, Krista E. Nicholson, Joshua N. Smith, Neil R. Loneragan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1634523ebfb34b2dbac6ef9773b465f9
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spelling	oai:doaj.org-article:1634523ebfb34b2dbac6ef9773b465f92021-12-02T15:05:38ZPreliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery10.1038/s41598-017-05189-02045-2322https://doaj.org/article/1634523ebfb34b2dbac6ef9773b465f92017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05189-0https://doaj.org/toc/2045-2322Abstract The incidental capture of wildlife in fishing gear presents a global conservation challenge. As a baseline to inform assessments of the impact of bycatch on bottlenose dolphins (Tursiops truncatus) interacting with an Australian trawl fishery, we conducted an aerial survey to estimate dolphin abundance across the fishery. Concurrently, we carried out boat-based dolphin photo-identification to assess short-term fidelity to foraging around trawlers, and used photographic and genetic data to infer longer-term fidelity to the fishery. We estimated abundance at ≈ 2,300 dolphins (95% CI = 1,247–4,214) over the ≈ 25,880-km2 fishery. Mark-recapture estimates yielded 226 (SE = 38.5) dolphins associating with one trawler and some individuals photographed up to seven times over 12 capture periods. Moreover, photographic and genetic re-sampling over three years confirmed that some individuals show long-term fidelity to trawler-associated foraging. Our study presents the first abundance estimate for any Australian pelagic dolphin community and documents individuals associating with trawlers over days, months and years. Without trend data or correction factors for dolphin availability, the impact of bycatch on this dolphin population’s conservation status remains unknown. These results should be taken into account by management agencies assessing the impact of fisheries-related mortality on this protected species.Simon J. AllenKenneth H. PollockPhil J. BouchetHalina T. KobrynDeirdre B. McElligottKrista E. NicholsonJoshua N. SmithNeil R. LoneraganNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Simon J. Allen Kenneth H. Pollock Phil J. Bouchet Halina T. Kobryn Deirdre B. McElligott Krista E. Nicholson Joshua N. Smith Neil R. Loneragan Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
description	Abstract The incidental capture of wildlife in fishing gear presents a global conservation challenge. As a baseline to inform assessments of the impact of bycatch on bottlenose dolphins (Tursiops truncatus) interacting with an Australian trawl fishery, we conducted an aerial survey to estimate dolphin abundance across the fishery. Concurrently, we carried out boat-based dolphin photo-identification to assess short-term fidelity to foraging around trawlers, and used photographic and genetic data to infer longer-term fidelity to the fishery. We estimated abundance at ≈ 2,300 dolphins (95% CI = 1,247–4,214) over the ≈ 25,880-km2 fishery. Mark-recapture estimates yielded 226 (SE = 38.5) dolphins associating with one trawler and some individuals photographed up to seven times over 12 capture periods. Moreover, photographic and genetic re-sampling over three years confirmed that some individuals show long-term fidelity to trawler-associated foraging. Our study presents the first abundance estimate for any Australian pelagic dolphin community and documents individuals associating with trawlers over days, months and years. Without trend data or correction factors for dolphin availability, the impact of bycatch on this dolphin population’s conservation status remains unknown. These results should be taken into account by management agencies assessing the impact of fisheries-related mortality on this protected species.
format	article
author	Simon J. Allen Kenneth H. Pollock Phil J. Bouchet Halina T. Kobryn Deirdre B. McElligott Krista E. Nicholson Joshua N. Smith Neil R. Loneragan
author_facet	Simon J. Allen Kenneth H. Pollock Phil J. Bouchet Halina T. Kobryn Deirdre B. McElligott Krista E. Nicholson Joshua N. Smith Neil R. Loneragan
author_sort	Simon J. Allen
title	Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
title_short	Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
title_full	Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
title_fullStr	Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
title_full_unstemmed	Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
title_sort	preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1634523ebfb34b2dbac6ef9773b465f9
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Preliminary estimates of the abundance and fidelity of dolphins associating with a demersal trawl fishery

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