Abstract
This study evaluated the relationship between the young of year (YOY) abundance of migratory fish species and the interannual variations in the duration and delay of floods in the Upper Paraná River floodplain. YOY of the most abundant migratory species Brycon orbignyanus, Hemisorubim platyrhynchos, Leporinus elongatus, Leporinus macrocephalus, Leporinus obtusidens, Pseudoplatystoma corruscans, Pterodoras granulosus, Prochilodus lineatus, Salminus brasiliensis and Sorubim lima were studied in a stretch of the Paraná river influenced by dams. Multiple regression analyses were performed with flood duration and delay as predictors for YOY abundances. There were differences among the species in the responses to flood duration and delay. The species B. orbignyanus, L. elongatus, L. macrocephalus, L. obtusidens, and P. lineatus exhibited an exponential increase in YOY abundance with flood duration. An exponential decrease in YOY abundance with flood delay was found for most of the studied species. Nevertheless, flood delay and flood duration were significant predictors of YOY abundance for L. elongatus, L. obtusidens, P. corruscans and P. lineatus. For these species, flood delays may result in failure of recruitment because these species migrate early in the season to adjust their energy reserves and their swimming patterns. Therefore, any efforts to preserve migratory fish should consider discharge manipulation from reservoirs upstream of the study areas. It is crucial that reservoirs are operated in such a way that the quantity, duration and timing of water release are compatible with the viability of spawning and the survival of early life stages of migratory fish.
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Acknowledgments
The authors are grateful to the Program of Environmental Sciences, of the Maringá State University; to the logistical support by the Nucleus of Research in Limnology, Ichthyology and Aquaculture (Nupélia), and financial support was provided by the National Council of Scientific and Technological Development (CNPq) to PELD Site-6 (Process 403686/2012-1) and to AGO (Process 830319/1999-9). CAPES/PROEX also helped funding sampling. AAA and LCG thank CNPq for the “Bolsa Produtividade em Pesquisa”.
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Oliveira, A.G., Suzuki, H.I., Gomes, L.C. et al. Interspecific variation in migratory fish recruitment in the Upper Paraná River: effects of the duration and timing of floods. Environ Biol Fish 98, 1327–1337 (2015). https://doi.org/10.1007/s10641-014-0361-5
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DOI: https://doi.org/10.1007/s10641-014-0361-5