First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA

Among the hammerhead sharks, scalloped hammerheads (Sphyrna lewini) have undergone the steepest population declines worldwide. Due to their high susceptibility to exploitation, the species is now classified as ‘critically endangered’, the most threatened category listed by the International Union fo...

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Autores principales:	Alyssa M. Budd, Madalyn K. Cooper, Agnès Le Port, Tom Schils, Matthew S. Mills, Mari E. Deinhart, Roger Huerlimann, Jan M. Strugnell
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Biomonitoring Chondrichthyes Conservation eDNA Elasmobranch Survey Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/b0ee508361b34ed19d167d0ddc1fb4ba
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spelling	oai:doaj.org-article:b0ee508361b34ed19d167d0ddc1fb4ba2021-12-01T04:50:30ZFirst detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA1470-160X10.1016/j.ecolind.2021.107649https://doaj.org/article/b0ee508361b34ed19d167d0ddc1fb4ba2021-08-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21003149https://doaj.org/toc/1470-160XAmong the hammerhead sharks, scalloped hammerheads (Sphyrna lewini) have undergone the steepest population declines worldwide. Due to their high susceptibility to exploitation, the species is now classified as ‘critically endangered’, the most threatened category listed by the International Union for Conservation of Nature. There is an urgent need for data on the distribution of S. lewini to inform the design and implementation of effective conservation management strategies, and mitigate the risk of global extinction. Environmental DNA (eDNA) is emerging as a powerful method to monitor the geographic distribution, population trends, and habitat usage of rare and endangered species. In comparison to traditional survey methods, eDNA methods offer lower cost, higher detection rates, and are non-invasive. At present, there is no targeted eDNA assay for the detection of S. lewini and existing methods to assess their distribution are either fisheries-dependent, leading to bias, or costly and laborious, leading to impracticality in regions of low or unknown abundance. Here we present an optimised workflow for the detection of S. lewini presence using eDNA methods, and apply these to successfully detect scalloped hammerhead sharks in Guam, of the western Pacific Ocean, where their presence has not been scientifically reported since the 1970s. The detection of S. lewini by eDNA survey methods was achieved from a single-day sampling effort, demonstrating the efficacy of the technique and workflow. If implemented, the eDNA survey methods developed here will enable the rapid generation of information on the distribution of scalloped hammerhead sharks in the western Pacific, and likely globally, and assist in the accurate placement of no-take reserves to best enable the species’ recovery.Alyssa M. BuddMadalyn K. CooperAgnès Le PortTom SchilsMatthew S. MillsMari E. DeinhartRoger HuerlimannJan M. StrugnellElsevierarticleBiomonitoringChondrichthyesConservationeDNAElasmobranchSurveyEcologyQH540-549.5ENEcological Indicators, Vol 127, Iss , Pp 107649- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biomonitoring Chondrichthyes Conservation eDNA Elasmobranch Survey Ecology QH540-549.5
spellingShingle	Biomonitoring Chondrichthyes Conservation eDNA Elasmobranch Survey Ecology QH540-549.5 Alyssa M. Budd Madalyn K. Cooper Agnès Le Port Tom Schils Matthew S. Mills Mari E. Deinhart Roger Huerlimann Jan M. Strugnell First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
description	Among the hammerhead sharks, scalloped hammerheads (Sphyrna lewini) have undergone the steepest population declines worldwide. Due to their high susceptibility to exploitation, the species is now classified as ‘critically endangered’, the most threatened category listed by the International Union for Conservation of Nature. There is an urgent need for data on the distribution of S. lewini to inform the design and implementation of effective conservation management strategies, and mitigate the risk of global extinction. Environmental DNA (eDNA) is emerging as a powerful method to monitor the geographic distribution, population trends, and habitat usage of rare and endangered species. In comparison to traditional survey methods, eDNA methods offer lower cost, higher detection rates, and are non-invasive. At present, there is no targeted eDNA assay for the detection of S. lewini and existing methods to assess their distribution are either fisheries-dependent, leading to bias, or costly and laborious, leading to impracticality in regions of low or unknown abundance. Here we present an optimised workflow for the detection of S. lewini presence using eDNA methods, and apply these to successfully detect scalloped hammerhead sharks in Guam, of the western Pacific Ocean, where their presence has not been scientifically reported since the 1970s. The detection of S. lewini by eDNA survey methods was achieved from a single-day sampling effort, demonstrating the efficacy of the technique and workflow. If implemented, the eDNA survey methods developed here will enable the rapid generation of information on the distribution of scalloped hammerhead sharks in the western Pacific, and likely globally, and assist in the accurate placement of no-take reserves to best enable the species’ recovery.
format	article
author	Alyssa M. Budd Madalyn K. Cooper Agnès Le Port Tom Schils Matthew S. Mills Mari E. Deinhart Roger Huerlimann Jan M. Strugnell
author_facet	Alyssa M. Budd Madalyn K. Cooper Agnès Le Port Tom Schils Matthew S. Mills Mari E. Deinhart Roger Huerlimann Jan M. Strugnell
author_sort	Alyssa M. Budd
title	First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
title_short	First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
title_full	First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
title_fullStr	First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
title_full_unstemmed	First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA
title_sort	first detection of critically endangered scalloped hammerhead sharks (sphyrna lewini) in guam, micronesia, in five decades using environmental dna
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/b0ee508361b34ed19d167d0ddc1fb4ba
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First detection of critically endangered scalloped hammerhead sharks (Sphyrna lewini) in Guam, Micronesia, in five decades using environmental DNA

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