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Trophic response of brown trout to signal crayfish invasion in a protected mountain river

2025Journal article Open access
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datacite.subject.fosCiências Naturais::Ciências Biológicas
datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorMatos, Matilde
dc.contributor.authorTeixeira, Amilcar
dc.contributor.authorNogueira, António B.
dc.contributor.authorPadilha, Janeide
dc.contributor.authorSousa, Ronaldo
dc.date.accessioned2025-11-14T16:58:37Z
dc.date.available2025-11-14T16:58:37Z
dc.date.issued2025
dc.description.abstractWe investigated the dietary response of brown trout (Salmo trutta) to the invasion of the signal crayfish (Pacifastacus leniusculus) in the Baceiro River (Montesinho Natural Park, Portugal). We analyzed 1012 stomach contents across six sites (five invaded and one non-invaded) over the year of 2023. A total of 49 distinct dietary taxa were identified. Results reveal strong spatial and temporal variation in trout diets. While aquatic invertebrates (e.g., Baetidae, Heptageniidae, Simuliidae, oligochaetes, and signal crayfish) dominated in the spring and early summer, a shift toward terrestrial insects was observed during summer. Generalized Linear Models indicated that signal crayfish biomass significantly influenced prey richness, biomass, and diversity, while multivariate analyses confirmed distinct prey assemblages across space and time. Our study also showed that signal crayfish were consumed occasionally (2.09 % of all prey items) but accounted for 17.68 % of total prey biomass. This situation suggests limited, but non-negligible, trophic incorporation of the invasive crayfish on the brown trout diet, with possible implications for brown trout condition and food web structure. This study highlights the dynamic nature of trophic interactions following biological invasions and underscores the need for integrated management strategies to mitigate the impacts of P. leniusculus in protected freshwater ecosystems.eng
dc.description.sponsorshipThis study was supported by the Portuguese Foundation for Science and Technology (FCT) through national funds under the project MULTI-CRASH: Multi-dimensional ecological cascades triggered by an invasive species in pristine habitats (PTDC/CTA-AMB/0510/2021) (https://doi.org/10.54499/PTDC/CTA-AMB/0510/2021) and the Scientific Employment Stimulus - 6th Edition (2023.07078.CEECIND). We also thank the anonymous reviewer and the editor Luca Luiselli for constructive comments that improved quality of the manuscript.
dc.identifier.citationMatos, Matilde; Teixeira, Amilcar; Nogueira, Antonio B.; Padilha, Janeide; Sousa, Ronaldo (2025). Trophic response of brown trout to signal crayfish invasion in a protected mountain river. Acta Oecologica-International Journal of Ecology. ISSN 1146-609X. 129, p. 1-11
dc.identifier.doi10.1016/j.actao.2025.104135
dc.identifier.issn1146-609X
dc.identifier.urihttp://hdl.handle.net/10198/35078
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier BV
dc.relationMULTI-CRASH: Multi-dimensional ecological cascades triggered by an invasive species in pristine habitats
dc.relation.ispartofActa Oecologica
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectBiocontrol
dc.subjectFreshwater ecosystems
dc.subjectNon-native species
dc.subjectMontesinho natural Park
dc.subjectPacifastacus leniusculus
dc.subjectSalmo trutta
dc.titleTrophic response of brown trout to signal crayfish invasion in a protected mountain rivereng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMULTI-CRASH: Multi-dimensional ecological cascades triggered by an invasive species in pristine habitats
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Concurso de Projetos IC&DT em Todos os Domínios Científicos/PTDC%2FCTA-AMB%2F0510%2F2021/PT
oaire.citation.endPage11
oaire.citation.startPage1
oaire.citation.titleActa Oecologica-International Journal of Ecology
oaire.citation.volume129
oaire.fundingStreamConcurso de Projetos IC&DT em Todos os Domínios Científicos
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameTeixeira
person.givenNameAmilcar
person.identifier2153193
person.identifier.ciencia-id9510-3CF3-0393
person.identifier.orcid0000-0001-5336-1174
person.identifier.scopus-author-id7202385393
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublication4f0753fd-4b4f-46f6-8e2f-20c7f835a32a
relation.isAuthorOfPublication.latestForDiscovery4f0753fd-4b4f-46f6-8e2f-20c7f835a32a
relation.isProjectOfPublication0e75c512-e95c-48c8-ac36-4e184d20ea44
relation.isProjectOfPublication.latestForDiscovery0e75c512-e95c-48c8-ac36-4e184d20ea44

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