Can fishways restore river connectivity? A case study using β diversity as a method of assessment

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dc.contributor.authorMarques, Hugo [UNESP]
dc.contributor.authorDias, João Henrique Pinheiro [UNESP]
dc.contributor.authorRamos, Igor Paiva [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2019-10-06T15:25:38Z
dc.date.available2019-10-06T15:25:38Z
dc.date.issued2018-01-01
dc.description.abstractAim: β diversity was used as an indicator to test the hypothesis that a fishway can increase river connectivity, as a reduction in the value of this metric indicates greater similarity among fish assemblages. Methods: Quarterly sampling was performed with gillnets upstream and downstream of the Porto Primavera dam, Upper Paraná Basin, before the opening of the fishway between February 1999 and May 2001, and between February 2003 and May 2005 with the fishway in operation (10 samples per period/site). The correlation between the fish assemblages and sites was verified by applying two Mantel tests (downstream versus upstream before and one equivalent after the fishway) using the distance matrices generated by the Bray‐Curtis index. The β diversity between downstream and upstream was calculated using the Sørensen index for each sample for the comparison of such values before and after the operation of the fishway, which were tested with Asymptotic Wilcoxon-Mann-Whitney Test. To summarize changes in the structure of the fish assemblages between the sites and periods nonmetric multidimensional scaling (NMDS) was applied based on Bray-Curtis dissimilarities, using multi-response permutation procedures (MRPP). Results: The Mantel tests showed no correlation between the upstream and downstream assemblages before the operation of the fishway but greater correlation after. β diversity was lower after than before the fishway, representing an increase in similarity between downstream and upstream with the fishway. MRPP analysis indicated that the fish assemblages between the sites differed more than was expected by chance, with smaller divergence between the sampling sites after the fishway (A = 0.08) than before it opened (A = 0.09). Conclusions: Although fishways remain an incipient and controversial theme for neotropical fish, the Porto Primavera fishway appears to be effective in terms of the restoration of connectivity.en
dc.description.affiliationInstituto de Biociências Universidade Estadual Paulista – UNESP, R. Prof. Dr. Antônio Celso Wagner Zanin, 250
dc.description.affiliationFaculdade de Engenharia Universidade Estadual Paulista – UNESP, R. Monção, 226
dc.description.affiliationUnespInstituto de Biociências Universidade Estadual Paulista – UNESP, R. Prof. Dr. Antônio Celso Wagner Zanin, 250
dc.description.affiliationUnespFaculdade de Engenharia Universidade Estadual Paulista – UNESP, R. Monção, 226
dc.identifierhttp://dx.doi.org/10.1590/s2179-975X13917
dc.identifier.citationActa Limnologica Brasiliensia, v. 30.
dc.identifier.doi10.1590/s2179-975X13917
dc.identifier.fileS2179-975X2018000101009.pdf
dc.identifier.issn0102-6712
dc.identifier.scieloS2179-975X2018000101009
dc.identifier.scopus2-s2.0-85057256126
dc.identifier.urihttp://hdl.handle.net/11449/187105
dc.language.isoeng
dc.relation.ispartofActa Limnologica Brasiliensia
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectConservation
dc.subjectFish assemblage
dc.subjectFish passage
dc.subjectFluvial connectivity
dc.subjectβ diversity
dc.titleCan fishways restore river connectivity? A case study using β diversity as a method of assessmenten
dc.titlePassagens para peixes podem restaurar a conectividade fluvial? Um estudo de caso usando diversidade β como método de avaliaçãopt
dc.typeArtigo

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