Dispersal of fish eggs and larvae in a cascade of small hydropower plants with fish ladders
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PERSPECTIVES ON SUSTAINABLE HYDRO-POWER
Dispersal of fish eggs and larvae in a cascade of small hydropower plants with fish ladders Eduardo Meneguzzi Brambilla . Luiz G. M. Silva Andre´a Bialetzki . Marcos Gomes Nogueira
. Lee J. Baumgartner
.
Received: 9 April 2020 / Revised: 19 September 2020 / Accepted: 24 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract This study was conducted to investigate fish eggs and larvae dispersal in a river stretch influenced by small hydropower plants in Southeast Brazil. The main hypothesis is that the downstream dispersal of free-flowing eggs and larvae is likely to occur given the small size of the studied reservoirs and that passage through the dam may occur, with the fish ladder contributing to it. Eggs and larvae were collected fortnightly, between November 2016 and February 2017, from locations upstream of two dams, Guest editors: Ingeborg P. Helland, Michael Power, Eduardo G. Martins & Knut Alfredsen / Perspectives on the environmental implications of sustainable hydro-power
including lotic, transition and lentic zones. Additional samples were collected inside the fish ladders at each dam. Downstream dispersal of eggs and larvae was influenced by a combination of rainfall/flow variation and stage of the reproductive cycle, with the peak of rainfall during the summer coinciding with higher abundances. Under these conditions, eggs and larvae drifted downstream through the reservoirs and reached the dams. Once in the dam, they could pass through the fish ladder. This passage was correlated with larval density in the reservoir immediately upstream, although at very low densities compared with the other sampling sites located upstream of the fish ladders.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04425-5) contains supplementary material, which is available to authorized users.
Keywords Fish passage Ichthyoplankton River conservation Sapucaı´-Mirim River
E. M. Brambilla (&) M. G. Nogueira Departamento de Zoologia, Instituto de Biocieˆncias, Programa de Po´s-graduac¸a˜o em Cieˆncias Biolo´gicas (Zoologia), Universidade Estadual Paulista, Botucatu, SP, Brazil e-mail: [email protected]
A. Bialetzki Nu´cleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Programa de Po´s-graduac¸a˜o em Ecologia de Ambientes Aqua´ticos Continentais, Universidade Estadual de Maringa´, Maringa´, PR, Brazil
E. M. Brambilla L. G. M. Silva L. J. Baumgartner Institute of Land, Water and Society, Charles Sturt University, Albury, NSW, Australia L. G. M. Silva Stocker Lab, Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zurich, Switzerland
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Hydrobiologia
Introduction In the last decade, the popularity of small hydropower plants (SHPs) has increased globally, as an option for renewable energy (hydroelectric) with potential to reduce CO2 emissions (Romanelli et al., 2018). It has bee
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