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Combined per‐capita and abundance effects of an invasive species on native invertebrate diversity and a key ecosystem process

2022Journal article Open access
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dc.contributor.authorCarvalho, Francisco
dc.contributor.authorPascoal, Cláudia
dc.contributor.authorCassio, Fernanda
dc.contributor.authorTeixeira, Amílcar
dc.contributor.authorSousa, Ronaldo
dc.date.accessioned2022-03-03T12:01:08Z
dc.date.available2022-03-03T12:01:08Z
dc.date.issued2022
dc.description.abstract1. Invasive alien species (IAS) are leading to the homogenisation of taxonomic and functional biodiversity, with negative consequences for key ecosystem processes in fresh water. Invasive signal crayfish (Pacifastacus leniusculus) is expected to disrupt detritus-based food webs by affecting leaf breakdown and/or by decreasing invertebrate density and diversity through predation. The combination of per-capita and abundance effects of P. leniusculus in invaded ecosystems is still largely unknown. 2. A four-week field experiment was established in Rabaçal and Tuela Rivers (NE Portugal) to assess effects of P. leniusculus on invertebrate taxonomic and functional diversity and leaf litter breakdown following a gradient of invasion. We controlled the presence and absence of crayfish by placing the animals and leaf litter inside cages at six sites (three sites per river) according to the crayfish in situ abundance (absent, low, high). Cages were covered with coarse-or fine-mesh net to allow or prevent invertebrates from accessing the leaves. 3. Results showed that higher crayfish in situ abundance led to a decrease in abundance, richness and Shannon diversity of invertebrates and to changes in the communities’ structures. Higher crayfish abundance led also to a decrease in invertebrate functional redundancy and an increase in the percentage of invertebrate taxa with resistance forms. Leaf litter breakdown increased with crayfish presence and decreased at sites with higher crayfish abundance. 4. Overall, signal crayfish changed the community structure of invertebrates, with potential severe long-term effects on native communities and leaf litter breakdown. Given the widespread distribution of signal crayfish (and other crayfish species), their ecological impacts should be assessed carefully, especially in pristine freshwater ecosystems such as those described here.pt_PT
dc.description.sponsorshipThis work was supported by the strategic programme UIDB/04050/2020 funded by the Portuguese Foundation for Science and Technology (FCT). FCT supported this work through the scholarship SFRH/BD/119957/2016 (F. Carvalho).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarvalho, Francisco; Pascoal, Cláudia; Cássio, Fernanda; Teixeira, Amílcar; Sousa, Ronaldo (2022). Combined per‐capita and abundance effects of an invasive species on native invertebrate diversity and a key ecosystem process. Freshwater Biology. ISSN 0046-5070.pt_PT
dc.identifier.doi10.1111/fwb.13884pt_PT
dc.identifier.issn0046-5070
dc.identifier.urihttp://hdl.handle.net/10198/25138
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationImpacts of freshwater invasive crayfish species on key ecosystem processes under a climate change scenario
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectFunctional diversitypt_PT
dc.subjectLeaf litter breakdownpt_PT
dc.subjectSignal crayfishpt_PT
dc.subjectStreamspt_PT
dc.subjectTaxonomic diversitypt_PT
dc.titleCombined per‐capita and abundance effects of an invasive species on native invertebrate diversity and a key ecosystem processpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleImpacts of freshwater invasive crayfish species on key ecosystem processes under a climate change scenario
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F119957%2F2016/PT
oaire.citation.titleFreshwater Biologypt_PT
person.familyNameTeiga Teixeira
person.givenNameAmilcar António
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
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication4f0753fd-4b4f-46f6-8e2f-20c7f835a32a
relation.isAuthorOfPublication.latestForDiscovery4f0753fd-4b4f-46f6-8e2f-20c7f835a32a
relation.isProjectOfPublication4179867e-3686-4875-a1f5-88d203fcb86a
relation.isProjectOfPublication.latestForDiscovery4179867e-3686-4875-a1f5-88d203fcb86a

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