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Abundance and population structure of Plesionika narval (Fabricius, 1787) in the Northeastern Atlantic

2019Journal article Open access
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dc.contributor.authorSousa, R.
dc.contributor.authorPinho, M. R.
dc.contributor.authorDelgado, J.
dc.contributor.authorPinto, A. R.
dc.contributor.authorBiscoito, M.
dc.contributor.authorDellinger, T.
dc.contributor.authorHenriques, P.
dc.date.accessioned2021-05-10T11:35:49Z
dc.date.available2021-05-10T11:35:49Z
dc.date.issued2019
dc.description.abstractAnalysis of abundance and population structure of Plesionika narval was performed on data concerning 5,255 specimens obtained from 62 fishing sets carried out off the Madeira archipelago (Northeastern Atlantic) between 2004 and 2008 in a depth range from 101 to 350 m. Abundance ranged from 0.01 to 19.74 specimens-per-trap and significant differences were found between seasons, probably as a result of an increment of population in the spring during the recruitment season. The analysis of size distribution revealed that the carapace length (CL) ranged from 2.45 to 28.61 mm and that mean female size consistently exceeded that of males. Differences in mean CL were statistically significant between depth strata and seasons. Of the specimens sampled, 57.00% were males, 41.88% females and 1.42% undetermined. Sex ratio also differed significantly between seasons according to depth strata, consolidating the hypothesis of the existence of seasonal migrations related with the reproductive cycle of this species. Ovigerous females showed larger sizes and occurred all year around and remain in shallow waters in winter, summer and autumn and move to deeper waters in spring. The highest frequency of ovigerous females was recorded in summer, between 151 and 200 m deep supporting the hypothesis that spawning of this species occurs in shallow waters, especially in late summer.pt_PT
dc.description.abstractO estudo de abundância e dinâmica populacional de Plesionika narval foi efetuado com 5.255 espécimes provenientes de 62 lances de pesca realizados ao largo do arquipélago da Madeira (Atlântico Nordeste) de 2004 a 2008 entre 101 e 350 m de profundidade. A abundância oscilou entre 0,01 e 19,74 espécimes-por-armadilha com diferenças significativas entre estações provavelmente devido ao aumento da população na primavera durante o período de recrutamento. A análise da distribuição de tamanhos revelou que o comprimento da carapaça (CL) variou entre 2,45 e 28,61 mm e que o tamanho médio das fêmeas excedeu o dos machos. Verificaram-se diferenças significativas no CL médio entre estrato de profundidade e estação. Do total amostrado, 57,00% foram machos, 41,88% fêmeas e 1,42% indeterminados. A razão de sexos também diferiu significativamente entre estações de acordo com a profundidade, consolidando a hipótese da existência de migrações sazonais relacionadas com o ciclo reprodutivo desta espécie. As fêmeas ovadas apresentaram maiores tamanhos e ocorreram durante todo o ano permanecendo em águas pouco profundas no inverno, verão e outono e migrando para águas profundas na primavera. A maior frequência de fêmeas ovadas foi registada no verão, entre 151 e 200 m de profundidade reforçando a hipótese de que a desova desta espécie ocorre em águas menos profundas, especialmente no final do verão.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSousa, R., Pinho, M. R., Delgado, J., Pinto, A. R., Biscoito, M., Dellinger, T., & Henriques, P. (2019). Abundance and population structure of Plesionika narval (Fabricius, 1787) in the Northeastern Atlantic. Brazilian Journal of Biology, 79(1), 111-119. 10.1590/1519-6984.179610pt_PT
dc.identifier.doi10.1590/1519-6984.179610pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3382
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstituto Internacional de Ecologiapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPlesionika narvalpt_PT
dc.subjectPandalidspt_PT
dc.subjectPopulation structurept_PT
dc.subjectSize compositionpt_PT
dc.subjectMadeira (Portugal)pt_PT
dc.subjectPandalídeospt_PT
dc.subjectEstrutura populacionalpt_PT
dc.subjectComposição tamanhospt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleAbundance and population structure of Plesionika narval (Fabricius, 1787) in the Northeastern Atlanticpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage119pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage111pt_PT
oaire.citation.titleBrazilian Journal of Biologypt_PT
oaire.citation.volume79pt_PT
person.familyNameSousa
person.familyNameDelgado
person.familyNameda Conceição Biscoito
person.familyNameDellinger
person.familyNameHenriques
person.givenNameRicardo
person.givenNameJoão
person.givenNameManuel José
person.givenNameThomas
person.givenNamePaulo
person.identifierhttps://scholar.google.pt/citations?user=I-Kmap0AAAAJ&hl=pt-PT
person.identifier.ciencia-id7B18-5677-6571
person.identifier.ciencia-id2F17-D43A-FB1F
person.identifier.ciencia-idD21E-BADC-7807
person.identifier.orcid0000-0002-5416-6570
person.identifier.orcid0000-0003-4268-7202
person.identifier.orcid0000-0002-9347-0823
person.identifier.orcid0000-0002-2424-8620
person.identifier.orcid0000-0001-5061-2732
person.identifier.scopus-author-id7003679889
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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