Differential piscivory of the native Percichthys trucha and exotic salmonids upon the native forage fish Galaxias maculatus in Patagonian Andean lakes |
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| Authors: | Patricio J Macchi Miguel A Pascual Pablo H Vigliano |
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| Institution: | aCentro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue, Quintral 1250, (8400) Bariloche, Río Negro, Argentina;bCentro Nacional Patagónico (CENPAT), CONICET. Blvd Brown S/N, (9120) Puerto Madryn, Chubut, Argentina |
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| Abstract: | The present paper analyses predation patterns, of Percichthys trucha and salmonid fish upon Galaxias maculatus in five lakes of northern Patagonia with differing community and environmental characteristics. Tank experiments were performed to evaluate relative efficiency of native and exotic predators of G. maculatus under treatments with and without cover (aquatic vegetation). Important differences were found between predators with regards to distribution and consumption of G. maculatus. Salmonids are more efficient than P. trucha in consuming G. maculatus in deep environments with scarcely vegetation; in contrast to native species they frequently use the pelagic environment. Although pelagic habitat might have served in the past as a refuge from native predators in the past, G maculatus now experiences intense predation in the pelagic zone by exotic salmonids. It is suggested that the widespread distribution of G. maculatus in Patagonian lakes may have facilitated the success of salmonids throughout Patagonia. |
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| Keywords: | Piscivory Galaxias maculatus Percichthys trucha Oncorhynchus mykiss Salvelinus fontinalis Salmo trutta Patagonian Andean lakes |
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