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dc.contributor.authorLennert-Cody, Cleridy E.
dc.contributor.authorMaunder, Mark N.
dc.contributor.authorFiedler, Paul C.
dc.contributor.authorMinami, Mihoko
dc.contributor.authorGerrodette, Tim
dc.contributor.authorRusin, Jeremy
dc.contributor.authorMinte-Vera, Carolina V.
dc.contributor.authorScott, Michael
dc.contributor.authorBuckland, Stephen Terrence
dc.identifier.citationLennert-Cody , C E , Maunder , M N , Fiedler , P C , Minami , M , Gerrodette , T , Rusin , J , Minte-Vera , C V , Scott , M & Buckland , S T 2016 , ' Purse-seine vessels as platforms for monitoring the population status of dolphin species in the eastern tropical Pacific Ocean : the use of fishing vessels as scientific platforms ' , Fisheries Research , vol. 178 , pp. 101-113 .
dc.identifier.otherPURE: 241943912
dc.identifier.otherPURE UUID: cb3c1ac9-342f-4e73-bed5-290566db36f7
dc.identifier.otherRIS: urn:EDB74A882EA33E103FA309BDF494FBE1
dc.identifier.otherScopus: 84949528602
dc.identifier.otherWOS: 000375739100011
dc.identifier.otherORCID: /0000-0002-9939-709X/work/73701004
dc.description.abstractIn the eastern tropical Pacific Ocean, yellowfin tuna (Thunnus albacares) are often found in association with spotted (Stenella attenuata) and spinner (Stenella longirostris) dolphins. Purse-seine vessels use this co-occurrence to locate the tuna by searching for dolphins and associated birds. Data collected by onboard observers since the late 1970s were used to develop indices of relative abundance for dolphins, based on line-transect methodology, when the primary method of detection of dolphin herds was with binoculars. However, trend estimation was subsequently discontinued in 2000 due to concerns about changes in reporting rates of dolphin herd detections with increased use of helicopter and radar search. At present, as a result of a hiatus in fishery-independent surveys since 2006, fisheries observer data are the only source of information with which to monitor the status of eastern tropical Pacific Ocean dolphin populations. In this paper, trend estimation with the onboard observer data is revisited using a sightings-per-unit-effort approach. Despite different assumptions and model structure, the results indicate a lack of independence between the distribution of search effort and the search methods used, and the abundance of dolphin herds associated with tunas, on several spatial and temporal scales. This lack of independence poses a considerable challenge to the development of a reliable index of relative abundance for dolphins with these data. Given these results, alternatives for dolphin abundance estimation are discussed. One alternative is the use of purse-seine vessels for line-transect surveys during fishery closure periods. Another alternative is the use of purse-seine vessels during normal fishing operations as platforms for the collection of mark-recapture data (e.g., passive integrated transponder tags or genetics sampling). Life-history data collection, as a supplement to the collection of other data types, is also discussed. Further research and development is needed to assess whether these alternative methods will be useful.
dc.relation.ispartofFisheries Researchen
dc.rights© 2016, Publisher / the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at /
dc.subjectDolphin abundanceen
dc.subjectGeneralized additive modelen
dc.subjectSH Aquaculture. Fisheries. Anglingen
dc.subjectGE Environmental Sciencesen
dc.subjectQH301 Biologyen
dc.titlePurse-seine vessels as platforms for monitoring the population status of dolphin species in the eastern tropical Pacific Ocean : the use of fishing vessels as scientific platformsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews. Centre for Research into Ecological & Environmental Modellingen
dc.description.statusPeer revieweden

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