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Trophic interactions of two sympatric small pelagic fishes off the southern coast of Angola

2025-04-03Journal article Restricted access
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dc.contributor.authorQuiatuhanga, Domingas
dc.contributor.authorMorais, Pedro
dc.contributor.authorTeodosio, Maria
dc.date.accessioned2025-09-12T08:54:05Z
dc.date.available2025-09-12T08:54:05Z
dc.date.issued2025-04-03
dc.description.abstractNumerous small pelagic fish species are of great economic importance and link the lower and upper levels of the marine food web. The round sardinella Sardinella aurita and flat sardinella S. maderensis coexist along their distribution range in the southeastern Atlantic Ocean, where we hypothesise that they compete for similar prey. Thus, this study aimed to compare the trophic ecology of these species off the southern coast of Angola during the austral summer and winter, by determining their diet composition and overlap, feeding strategies, trophic positions, and evaluating the correlation between their feeding intensity and remote-derived chlorophyll a concentration (Chl-a) and sea surface temperature. The results demonstarte that both species are generalists and ingest a wide range of protistoplankton and metazooplankton taxa of distinct sizes. Both sardinellas show high flexibility and adaptability to prey availability, using both filter-feeding and particulate-feeding modes. The diets were dominated by diatoms and calanoid copepods in terms of relative abundances and frequencies of occurrence, respectively, in the stomach contents. Tintinnid ciliates, fish eggs, decapod larvae, euphausiids, cladocerans and cnidarians had high wet weight contributions. The diets overlapped by 64% overall, indicating moderate competition for food, with S. maderensis exhibiting a lower trophic position than S. aurita (2.98 versus 3.49). The feeding intensity of S. maderensis was positively correlated with Chl-a, and moderately negatively correlated with SST, suggesting that species is more influenced by environmental variables owing to its lower trophic position. Trophic interactions between the two species appear to be mediated by prey sizes and availability. These findings demonstate the value of satellite-derived data as proxies to estimate the feeding intensity of these species, which will be useful to formulate regional ecological models or to predict the stock trends of S. maderensis in particular.eng
dc.identifier.doi10.2989/1814232x.2025.2526117
dc.identifier.eissn1814-2338
dc.identifier.issn1814-232X
dc.identifier.urihttp://hdl.handle.net/10400.1/27685
dc.language.isoeng
dc.peerreviewedyes
dc.publisherTaylor and Francis Group
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofAfrican Journal of Marine Science
dc.rights.uriN/A
dc.subjectDiet
dc.subjectFeeding intensity
dc.subjectNamibe province
dc.subjectSardinella aurita
dc.subjectSardinella maderensis
dc.subjectRemote sensing data
dc.subjectStomach contentes
dc.subjectTrophic position
dc.titleTrophic interactions of two sympatric small pelagic fishes off the southern coast of Angolaeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.endPage180
oaire.citation.issue2
oaire.citation.startPage169
oaire.citation.titleAfrican Journal of Marine Science
oaire.citation.volume47
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameQuiatuhanga
person.familyNameTeodosio
person.givenNameDomingas
person.givenNameMaria
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.orcid0000-0002-5485-5181
person.identifier.orcid0000-0002-0939-9885
person.identifier.ridB-5077-2013
person.identifier.scopus-author-id56196396700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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