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Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia

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Abstract

Because of their remote location and lack of supporting infrastructure, large glacial rivers of southern Patagonia have remained free of dams. But this is bound to change: two dams proposed for the Santa Cruz River would supply 16% of Argentina’s hydropower and five dams planned for the Pascua and Baker Rivers could supply over 20% of Chile’s hydropower. In this paper, we project the losses of habitat and juvenile Oncorhynchus mykiss, a recreationally important species, following the construction of the two dams in the Santa Cruz River. We applied a two-stage fitting approach, using generalized additive models and generalized lineal models (GLMs) sequentially to describe habitat-species relationships based on data collected through an intensive field survey of fish and environmental variables along 310 km of river. A simplified GLM trout model based on wetted width, substrate size, and river kilometer was selected which represents the observed geographic distribution very well and with the lowest predictive error. Based on this model, we estimated that habitat supporting 86% of current juvenile trout production will be lost to flooding by the dams. Our data generate a rare opportunity to perform a dam impact assessment by comparison with potential post-dam conditions.

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Acknowledgements

Funding for this research was provided by the Consejo Nacional de Investigaciones Cientıficas y Tecnologicas and grants from the Agencia Nacional para la Promocion de la Ciencia y la Tecnologıa and Consejo Nacional de Investigaciones. Cientıficas y Tecnologicas, Argentina, to M. Pascual. We also thank to the financial assistance of CONICET and ANPCyT. The authors wish to thank the owners of the estancias and the anonymous reviewers for their thoughtful comments.

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  1. CONICET - Centro Nacional Patagónico, Bld. Brown 2915, Puerto Madryn, Chubut, Argentina

    Analía P. Quiroga, Julio L. Lancelotti, Carla M. Riva-Rossi, Marina Tagliaferro, Martin García Asorey & Miguel A. Pascual

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  1. Analía P. Quiroga
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  2. Julio L. Lancelotti
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  3. Carla M. Riva-Rossi
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  4. Marina Tagliaferro
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Correspondence to Analía P. Quiroga.

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Quiroga, A.P., Lancelotti, J.L., Riva-Rossi, C.M. et al. Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia. Hydrobiologia 755, 57–72 (2015). https://doi.org/10.1007/s10750-015-2217-1

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