ANA RUTH ÁLVAREZ SÁNCHEZ

Abstract:

The Western Sandpiper Calidris mauri is a migratory shorebird that breeds during the summer in the East Siberian tundra and the coast of Alaska. Most individuals of this species migrates along the Pacific Flyway to spend the winter in temperate and tropical latitudes, some use the Atlantic Flyway. Near 30% of the western Sandpiper global population spend their winter in the northwest of Mexico. In order to understand this population dynamics, a detailed knowledge of the individuals that occupy this zone is required. Genetic markers have been used to determine the migratory connectivity, to identify the migrant geographic origin and to indirectly consider the relative importance of the wintering sites. The objective of the present study was to establish the identity and the genetic structure of the western Sandpiper in some of the most important nonbreeding aggregations of Mexico. To achieve this goal, genotypes of 168 adult individuals were identified using 10 nuclear markers microsatellites in 7 winter aggregations located in the Peninsula of Baja California, Sinaloa and the Yucatan Peninsula, coasts (México). Although the genetic diversity was moderately high (Ho= 0.713, Na= 14 and Ne= 5.1), the alleles distribution was homogenous between localities. Consequently, structure population analysis was similar for the different estimators of genetic differentiation used (FST=-0.0008, RST= 0.004, DST=-0.002). The estimations were also similar when considering separately males and females. These results were congruent with those obtained through a Bayesiana approach (STRUCTURE k= 1). Our data suggest that individuals wintering in México …

Año de publicación:

2011

Keywords:

Fuente:

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