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Occurrence of basking shark Cetorhinus maximus in southern Portuguese waters: a two-decade survey

2017-02Journal article Restricted access
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dc.contributor.authorCouto, Ana
dc.contributor.authorQueiroz, Nuno
dc.contributor.authorRelvas, Paulo
dc.contributor.authorBaptista, Miguel
dc.contributor.authorFurtado, Miguel
dc.contributor.authorCastro, Joana
dc.contributor.authorNunes, Maria
dc.contributor.authorMorikawa, Hirofumi
dc.contributor.authorRosa, Rui
dc.date.accessioned2019-11-20T15:07:48Z
dc.date.available2019-11-20T15:07:48Z
dc.date.issued2017-02
dc.description.abstractThere is a general consensus that many shark species are declining in numbers. However, effective management measures often depend on knowing how trends in abundance and distribution are influenced by environmental conditions. Several efforts to describe the occurrence and distribution of basking sharks Cetorhinus maximus have been made in northern Europe, particularly around the UK, but nothing is known regarding their occurrence in southern areas, such as the south of Portugal. Using 2 decades of observational data collected in the south of Portugal, we show that the occurrence of basking sharks in the area was highly seasonal, with individuals being observed mainly during spring. Based on in situ and satellite-derived environmental variables and climate indices, we also demonstrate that temporal trends were associated with the beginning of the upwelling season and that the inter-annual changes were related to lower values of sea surface temperature, North Atlantic Oscillation index, upwelling index, 2-mo lagged chlorophyll a and 3-mo lagged Atlantic Multidecadal Oscillation index, and higher values of 2-mo lagged upwelling index. These findings suggest that basking sharks are associated with the expansion of cold waters following upwelling events in the region, probably due to the aggregation and increase of zooplankton. Although the temperature recorded during our study years ranged from 14 to 24 degrees C, sharks were mainly observed when temperatures were lower than 20 degrees C, corroborating their preference for colder water. This study provides the first knowledge on the habitat use of basking sharks in southern European Atlantic areas.
dc.description.sponsorshipPROMAR Project [31-03-05-FEP-0037]
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT)
dc.identifier.doi10.3354/meps12007
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.urihttp://hdl.handle.net/10400.1/13225
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter-Research
dc.subjectSea-surface temperature
dc.subjectNorthern California current
dc.subjectMultidecadal oscillation
dc.subjectAtlantic oscillation
dc.subjectRecruitment success
dc.subjectWestern-Australia
dc.subjectRegime shifts
dc.subjectEastern North
dc.subjectNingaloo reef
dc.subjectWhale sharks
dc.titleOccurrence of basking shark Cetorhinus maximus in southern Portuguese waters: a two-decade survey
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage86
oaire.citation.startPage77
oaire.citation.titleMarine Ecology Progress Series
oaire.citation.volume564
person.familyNameRelvas
person.givenNamePaulo
person.identifier.ciencia-id2412-1F65-A044
person.identifier.orcid0000-0002-6404-5895
person.identifier.ridB-1257-2008
person.identifier.scopus-author-id6505976206
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication94f4d10b-242d-4560-b716-6375f1a01eac
relation.isAuthorOfPublication.latestForDiscovery94f4d10b-242d-4560-b716-6375f1a01eac

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