Interacting effects of spatial gradients and fishing gears on characterization of fish assemblages in large reservoirs
dc.contributor.author
dc.date.accessioned
2016-11-04T11:03:59Z
dc.date.available
2016-11-04T11:03:59Z
dc.date.issued
2016-03-01
dc.identifier.issn
0960-3166
dc.identifier.uri
dc.description.abstract
Understanding the variation of fish assemblages in reservoirs is crucial for precise interpretations of ecological processes. However, representative samples in such environments are subjected both to spatial zonation (longitudinal and transversal gradients) and limitations of fishing gears. We used a large zoned reservoir (Itaipu, Brazil) to perform a quasi-experiment that assessed the relative role of spatial gradients and fishing methods on fish diversity and composition. Active (cast nets, electrofishing and seines) and passive (gillnets and longlines) fishing gears were employed in lotic, transitional and lentic habitats of the reservoir and three large tributaries. In total 6281 individuals of 101 species were captured. Sampling methods and spatial gradients had an influence on species composition, with significant interactions between these factors. In addition, results produced by a variation partitioning analysis suggested that 21 % of the species richness was explained by the sampling methods and 7 % by the longitudinal gradient; whereas for species composition, 12 and 3 % corresponded to sampling methods and transversal gradients, respectively. Overall, our results suggest that variations among fishing gears is greater than across strong spatial gradients, emphasizing the importance of using multiple and complementary fishing methods in reservoirs for characterization of fish assemblages. The interactions between spatial gradients and sampling methods were higher with transversal than with longitudinal gradients, suggesting that substantial differences in species richness and composition among sampling gears depend to some extent on habitat. The approach used here would be applicable to any large zoned inland waterscape
dc.description.sponsorship
Financial support was provided by the Spanish Ministry of Economy and Competitiveness (project CGL2013-43822-R), the Government of Catalonia (ref. 2014 SGR 484), and CAPES (Programa Pesquisador Visitante Especial, ref. 88881.068352/2014-01).
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Springer Verlag
dc.relation
info:eu-repo/grantAgreement/MINECO//CGL2013-43822-R/ES/HACIA UN USO SOSTENIBLE DE LOS ECOSISTEMAS FLUVIALES MEDITERRANEOS: EFECTOS DIRECTOS E INDIRECTOS DE LA ALTERACION HIDROLOGICA EN PECES/
AGAUR/2014-2016/2014 SGR-484
dc.relation.isformatof
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s11160-015-9402-1
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© Reviews in Fish Biology and Fisheries, 2016, vol. 26, núm. 1, p. 71-81
dc.relation.ispartofseries
Articles publicats (D-CCAA)
dc.rights
Tots els drets reservats
dc.subject
dc.title
Interacting effects of spatial gradients and fishing gears on characterization of fish assemblages in large reservoirs
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/embargoedAccess
dc.embargo.terms
Cap
dc.date.embargoEndDate
info:eu-repo/date/embargoEnd/2026-01-01
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.contributor.funder
dc.relation.ProjectAcronym
dc.identifier.eissn
1573-5184