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Impact of the Highly Invasive Signal Crayfish (Pacifastacus leniusculus) on Freshwater Macroinvertebrate Communities

2026Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.sdg06:Água Potável e Saneamento
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorNogueira, António Barbosa
dc.contributor.authorOliveira, Bruno
dc.contributor.authorPadilha, Janeide
dc.contributor.authorVarandas, Simone
dc.contributor.authorTeixeira, Amilcar
dc.contributor.authorSousa, Ronaldo
dc.date.accessioned2026-03-20T14:30:42Z
dc.date.available2026-03-20T14:30:42Z
dc.date.issued2026
dc.description.abstractInvasive non-native species threaten freshwater ecosystems, disrupting the functioning and structure of the food chain and potentially leading to biodiversity loss. As omnivores, crayfish can modify their environment, directly affecting organisms such as macroinvertebrates. Macroinvertebrates, intermediate consumers in food chains, are influenced by both top-down and bottom-up forces, playing fundamental functional roles within freshwater ecosystems. The main aim of this study was to assess the effects of the signal crayfish Pacisfatacus leniusculus on the freshwater macroinvertebrate community in a mountainous area with very low human disturbance, while controlling for other measured environmental factors (e.g., T degrees C, pH, TDS). To this end, 34 sites (18 invaded and 16 non-invaded) in the Raba & ccedil;al and Tuela River basins (Portugal) were sampled. Comparisons were made between basins and invaded and uninvaded sites regarding abundance, biomass, richness and indices of macroinvertebrate community diversity and functionality. A total of 38,529 organisms from 133 freshwater macroinvertebrate taxa were identified. Our results showed a decline in the biomass, richness and diversity of macroinvertebrates with increasing crayfish abundance. Few differences in functional diversity were found, probably due to functional redundancy; however, crayfish did affect certain functional groups: drillers and periphyton-associated macroinvertebrates exhibited a negative correlation with crayfish abundance, whereas scrapers and gravel-associated macroinvertebrates demonstrated a positive response. In addition to the abundance of signal crayfish, temperature, total dissolved solids and pH showed some influence on the macroinvertebrate community. Overall, these findings are fundamental for better understanding, predicting and managing crayfish impacts in low disturbance areas of upper catchments. It is important to continue monitoring not only non-native crayfish populations but also macroinvertebrate (and other) communities, as our findings clearly demonstrate the sensitivity of these organisms to crayfish presence. Future research should investigate the main mechanisms of this change in the macroinvertebrate community.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). Simone Varandas also thanks FCT under the projects UID/04033/2025: Centre for the Research and Technology of Agro-Environmental and Biological Sciences (https://doi.org/10.54499/UID/04033/2025) and LA/P/0126/2020 (https://doi.org/10.54499/LA/P/0126/2020). Janeide Padilha was funded by FCT through the Scientific Employment Stimulus program (CEECIND), under contract number 2023.07078.CEECIND/CP2841/CT0002- our sincere gratitute for their support. We thank two anonymous reviewers and the editor Dr. Roger Paulo Mormul for constructive comments that improved the quality of the manuscript. Open access publication funding provided by FCT (b-on).
dc.identifier.citationNogueira, Antonio B.; Oliveira, Bruno; Padilha, Janeide; Varandas, Simone; Teixeira, Amilcar; Sousa, Ronaldo (2026). Impact of the Highly Invasive Signal Crayfish (Pacifastacus leniusculus) on Freshwater Macroinvertebrate Communities. Freshwater Biology. ISSN 0046-5070. 71:2, p. 1-15
dc.identifier.doi10.1111/fwb.70179
dc.identifier.issn0046-5070
dc.identifier.issn1365-2427
dc.identifier.urihttp://hdl.handle.net/10198/36171
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley
dc.relationMULTI-CRASH: Multi-dimensional ecological cascades triggered by an invasive species in pristine habitats
dc.relationCentre for the Research and Technology of Agro-Environmental and Biological Sciences
dc.relation.ispartofFreshwater Biology
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectBiological invasions
dc.subjectDiversity índices
dc.subjectFreshwater ecosystems
dc.subjectFunctional diversity
dc.subjectInvasive species
dc.titleImpact of the Highly Invasive Signal Crayfish (Pacifastacus leniusculus) on Freshwater Macroinvertebrate Communitieseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberPTDC/CTA-AMB/0510/2021
oaire.awardNumberUID/AGR/04033/2013
oaire.awardTitleMULTI-CRASH: Multi-dimensional ecological cascades triggered by an invasive species in pristine habitats
oaire.awardTitleCentre for the Research and Technology of Agro-Environmental and Biological Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Concurso de Projetos IC&DT em Todos os Domínios Científicos/PTDC%2FCTA-AMB%2F0510%2F2021/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FAGR%2F04033%2F2013/PT
oaire.citation.endPage15
oaire.citation.issue2
oaire.citation.startPage1
oaire.citation.titleFreshwater Biology
oaire.citation.volume71
oaire.fundingStreamConcurso de Projetos IC&DT em Todos os Domínios Científicos
oaire.fundingStream6817 - DCRRNI ID
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.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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