Meeting Abstract

4.1  Jan. 4  Genetic population structure of the shrimp Atyaephrya desmarestii (Millet, 1831) in dependence of the distance to the sea PALACIOS THEIL, E.*; GONZALEZ-ORTEGON, E.; GARCIA-RASO, E.; SCHUBART, C.D.; CUESTA, J.A.; Instituto de Ciencias Marinas de Andaluc�a, CSIC, Spain; Instituto de Ciencias Marinas de Andaluc�a, CSIC, Spain; Universidad de M�laga, Spain; Universit�t Regensburg, Germany; Instituto de Ciencias Marinas de Andaluc�a, CSIC, Spain emma_pt@yahoo.es

The freshwater shrimp Atyaephyra desmarestii is present in rivers of Europe, North Africa and the Middle East up to Iran. In the Iberian Peninsula, the populations of the Atlantic rivers seem to occur relatively farther from the sea than the populations of the Mediterranean rivers. Furthermore, frequent occurrence of sudden rises in the level of the Mediterranean rivers may sweep individuals of A. desmarestii, larvae as well as adults, to the sea. This would facilitate their transport to other river basins and allow an increased gene flow between different populations, which a priori should have a high isolation level. The longer distance to the sea could thereby result in a higher degree of genetic structure in Atlantic populations of A. desmarestii compared with Mediterranean ones. In this study, information about the genetic population structure of A. desmarestii was obtained based on the mitochondrial genes 16S rRNA and COI. Populations from different river basins of the Iberian Peninsula were analyzed as well as populations of different tributaries to the same river basin. Data for 14 populations from five Atlantic and five Mediterranean river basins were obtained. These data were also compared with those from the populations of two German rivers. The obtained information allows the estimation of the genetic diversity of a population, and of the genetic distance between populations of rivers of the same and of different basins.