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Smooth hammerhead sharks (Sphyrna zygaena) observed off the Portuguese southern coast

2018Journal article Restricted access
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dc.contributor.authorCouto, Ana
dc.contributor.authorQueiroz, Nuno
dc.contributor.authorKetchum, James T.
dc.contributor.authorSampaio, Eduardo
dc.contributor.authorFurtado, Miguel
dc.contributor.authorCid, André A.
dc.contributor.authorCastro, Joana
dc.contributor.authorRosa, Rui
dc.date.accessioned2020-01-19T20:34:29Z
dc.date.available2020-01-19T20:34:29Z
dc.date.issued2018
dc.description.abstractDespite its worldwide distribution and vulnerable status, knowledge on the biology and ecology of the smooth hammerhead Sphyrna zygaena in the temperate NE Atlantic is very scarce. Here, we reveal intra-annual fluctuations in S. zygaena abundance in the Portuguese southwestern coast, using sightings data collected on board whale watching boats over five years (2010–14; excluding winter months). Moreover, we investigated how shark abundance is related to local environmental conditions. We describe the first smooth hammerhead “hotspot” in the NE Atlantic, and we show a recurrent pattern of occurrence during the warmer summer and autumn months (from July to October) near Sagres and Martinhal Bay and islands. Intra-annual variations in abundance were significantly associated with sea surface temperature and negatively related with upwelling index and chlorophyll a, suggesting horizontal movements linked to the seasonal changes. Hence, hammerheads moved inshore during the warmer periods (with low primary productivity), due to either direct influence of temperature in their movements or indirect influence in prey distribution. This hammerhead “hotspot” may constitute a nursery ground for S. zygaena, nevertheless, our data does not allow us to prove or refute such claim. Future telemetry-based studies should be conducted to fully understand hammerhead movements and habitat preferences, and to evaluate this “hotspot” as a critical habitat for this predator.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1007/s10641-018-0773-8pt_PT
dc.identifier.issn0378-1909
dc.identifier.urihttp://hdl.handle.net/10451/41186
dc.language.isoengpt_PT
dc.publisherSpringerpt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs10641-018-0773-8pt_PT
dc.subjectSea surface temperaturept_PT
dc.subjectNursery groundpt_PT
dc.subjectHorizontal movementspt_PT
dc.subjectSeasonalitypt_PT
dc.titleSmooth hammerhead sharks (Sphyrna zygaena) observed off the Portuguese southern coastpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1268pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage1261pt_PT
oaire.citation.titleEnvironmental Biology of Fishespt_PT
oaire.citation.volume101pt_PT
person.familyNameSampaio
person.familyNameFurtado
person.familyNameCastro
person.familyNameRosa
person.givenNameEduardo
person.givenNameMiguel
person.givenNameJoana
person.givenNameRui
person.identifier430759
person.identifier.ciencia-id8413-510B-00BB
person.identifier.ciencia-idB412-814F-D040
person.identifier.ciencia-id7B11-4E54-5D0E
person.identifier.ciencia-id2B10-7D61-FF7A
person.identifier.orcid0000-0002-9222-2553
person.identifier.orcid0000-0003-1315-2225
person.identifier.orcid0000-0001-7689-6411
person.identifier.orcid0000-0003-2801-5178
person.identifier.ridO-9436-2014
person.identifier.ridA-4580-2009
person.identifier.scopus-author-id55427467500
person.identifier.scopus-author-id56375650600
person.identifier.scopus-author-id7102610088
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd9921d4c-29b6-40da-9723-a342f343c623
relation.isAuthorOfPublication73561d31-dc6d-4818-877c-ec3a9cf705b6
relation.isAuthorOfPublication15f20c92-a75c-4a92-8337-83820373cfa4
relation.isAuthorOfPublication395f77c0-ac42-4b7c-9b4a-07fdb75305cc
relation.isAuthorOfPublication.latestForDiscovery395f77c0-ac42-4b7c-9b4a-07fdb75305cc

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