Spatial and temporal distribution of landlocked Galaxias maculatus and Galaxias platei (Pisces: Galaxiidae) in a lake in the South American Andes |
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Authors: | Juan P Barriga Miguel A Battini Patricio J Macchi Daniela Milano Victor E Cussac |
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Institution: | 1. Centro Regional Universitario Bariloche , Universidad Nacional del Comahue , Calle Quintal 1250, Bariloche, Río Negro, 8400, Argentina E-mail: vcussac@yahoo.com;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Argentina;3. Centro Regional Universitario Bariloche , Universidad Nacional del Comahue , Calle Quintal 1250, Bariloche, Río Negro, 8400, Argentina;4. Centro Regional Universitario Bariloche , Universidad Nacional del Comahue , Calle Quintal 1250, Bariloche, Río Negro, 8400, Argentina |
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Abstract: | Galaxiids are present in many of the Andean lakes in southern South America. We studied landlocked Galaxias maculatus (Jenyns) and Galaxias platei Steindachner populations in a deep oligotrophic lake (Lake Gutiérrez, Patagonia, Argentina). Their temporal and spatial distribution, intralacustrine movements (horizontal and vertical), and spawning periods were analysed using several sampling techniques (ichthyoplankton net, seine net, gill net, and baited benthic taps). We identified the early life stages of both species based on their morphology and otolith shape. The free embryos of both species migrate to the limnetic zone, where they coexist as larvae, facing the same food availability and probably the same predation risk. Each species then moves on to its own juvenile and adult habitat: the littoral and benthic zone for G. maculatus and only the deeper benthic zone for G. platei. Their adult habitats and part of their spawning periods partly overlap. |
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Keywords: | Galaxias maculatus Galaxias platei habitat shifts landlocked fish whitebait vertical distribution spawning period morphology |
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