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Diel patterns in space use, food and metabolic activity of Galaxias maculatus (Pisces: Galaxiidae) in the littoral zone of a shallow Patagonian lake

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Abstract

We detected that Galaxias maculatus exhibits a pattern where metabolic activity increases after sunrise and peaks between noon and sunset, but this species feeds in the afternoon, until several hours after sunset. Moreover, we showed that G. maculatus is observed in the littoral zone during the day, disappears completely from this zone after sunset and returns at sunrise. Littoral prey species are common in the diet of G. maculatus, but this study showed that pelagic prey is also present during twilight and night hours in smaller individuals (<50 mm), which is related to habitat use. These behavioural rhythms are especially important for G. maculatus, which runs a high predation risk when consuming prey that is widely available outside the littoral zone. This risk is ameliorated under the protection of low light intensity. Thus, G. maculatus is a key species linking lower trophic levels, such as the plankton community, to higher levels of native and exotic piscivores. These displacements of G. maculatus generate an active flow of energy and matter between habitats, with a potentially profound effect on the entire food network and energy dynamics of the lake.

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Acknowledgments

We thank N. Baccalá for assistance with statistical analysis and we are grateful to Audrey Shaw for the revision of the written English. This work was partially supported by Universidad Nacional del Comahue (Centro Regional Universitario Bariloche), Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).

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Authors and Affiliations

  1. Laboratorio de Fotobiología, INIBIOMA-CONICET, Universidad Nacional del Comahue, Quintral 1250, R8400FRF, Bariloche, Argentina

    Daniela Milano

  2. Laboratorio de Ictiología y Acuicultura Experimental, INIBIOMA-CONICET, Universidad Nacional del Comahue, Bariloche, Argentina

    Juana C. Aigo

  3. Grupo de Evaluación y Manejo de Recursos Ícticos, Universidad Nacional del Comahue, Bariloche, Argentina

    Patricio J. Macchi

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  1. Daniela Milano
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  2. Juana C. Aigo
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  3. Patricio J. Macchi
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Correspondence to Daniela Milano.

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Milano, D., Aigo, J.C. & Macchi, P.J. Diel patterns in space use, food and metabolic activity of Galaxias maculatus (Pisces: Galaxiidae) in the littoral zone of a shallow Patagonian lake. Aquat Ecol 47, 277–290 (2013). https://doi.org/10.1007/s10452-013-9443-2

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