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Genetic diversity in the Neotropical river otter, Lontra longicaudis (Mammalia, Mustelidae), in the Lower Delta of Parana River, Argentina and its relation with habitat suitability

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Abstract

Lontra longicaudis is a top predator of freshwater systems currently categorized as ‘data deficient’ by the IUCN. Thus far, no genetic studies have been carried out in Argentina. Using 8 microsatellite loci, we analysed the genetic diversity and individual relatedness in a population located at the Lower Delta of Paraná River, Argentina. Our data, together with available genetic information for other populations and habitat suitability data obtained from species distribution models previously published, were used to test whether genetic diversity, inbreeding, and parentage coefficients are related to habitat suitability both at landscape and at regional scale. Our results show that the levels of heterozygosity found in the Lower Delta are lowest reported to date. A low overall degree of relatedness between otter dyads was found. However, almost 20% showed relatedness values higher than 0.25, suggesting local reproduction. Finally, we found a positive association between habitat quality and levels of heterozygosity, both at landscape and regional scale, suggesting that in highly suitable habitats, the otters are genetically more variable. Our study constitutes the first one on the genetics of L. longicaudis in Argentina and provides baseline information for the development of conservation plans for the Lower Paraná River Delta population.

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Acknowledgments

This work could not have been undertaken without the help of N. Fracassi and the inhabitants of the Lower Delta. We specially thank Rubén, Clara, and Gastón and their family, for their help during field work. We also thank Andrés Pautasso, from the Museo de Ciencias Naturales “Florentino Ameghino” who kindly provided us with two tissue samples stored in the museum. We thank N.A. Pearson for his review. This work was supported by grants from the Consejo Nacional de Investigaciones Científicas y Técnicas of Argentina (PIP No. 11420100100189), the Agencia Nacional de Promoción Científica y Tecnológica of Argentina (PICT-2010-1978), and the National University of Luján (Fondos Finalidad 3.5). MHC and JIT are researchers of the CONICET.

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  1. Grupo de Estudios en Ecología de Mamíferos, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Rutas 5 y 7 s/n (B6700AQN), Luján, Argentina

    Anabella P. Trigila, Jonatan J. Gómez, Marcelo H. Cassini & Juan I. Túnez

  2. Laboratorio de Biología del Comportamiento, Instituto de Biología y Medicina Experimental (IBYME-CONICET), Vuelta de Obligado 2490 (C1428ADN), Buenos Aires, Argentina

    Jonatan J. Gómez & Marcelo H. Cassini

  3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917 (C1033AAJ), Buenos Aires, Argentina

    Marcelo H. Cassini & Juan I. Túnez

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  1. Anabella P. Trigila
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  2. Jonatan J. Gómez
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  3. Marcelo H. Cassini
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Trigila, A.P., Gómez, J.J., Cassini, M.H. et al. Genetic diversity in the Neotropical river otter, Lontra longicaudis (Mammalia, Mustelidae), in the Lower Delta of Parana River, Argentina and its relation with habitat suitability. Hydrobiologia 768, 287–298 (2016). https://doi.org/10.1007/s10750-015-2557-x

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