Colonization in action: genetic characteristics of <Emphasis Type="Italic">Daphnia magna</Emphasis> Strauss (Crustacea,Anomopoda) in two recently restored ponds |
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Authors: | Raquel Ortells Carla Olmo Xavier Armengol |
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Institution: | 1.Departament de Microbiologia i Ecologia, Institut Cavanilles de Biodiversitat i Biologia Evolutiva,Universitat de València,Paterna, Valencia,Spain;2.Institut Cavanilles de Biodiversitat i Biologia Evolutiva,Universitat de València,Paterna, Valencia,Spain |
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Abstract: | New habitats are an interesting tool to monitor colonization processes in the light of changes in genetic structure and evolutionary
potential of populations. Cladocerans are cyclical parthenogens that offer the possibility to track genetic changes during
the colonization process due to the alternation of sexual and asexual phases. The locally called “malladas” are shallow and
temporary peridunal ponds in Eastern Spain that were silted in the 1960s and have been recently dug to their original basin.
We here describe the colonization process in two of these newly restored ponds by the cladoceran Daphnia magna during their first 3 years. This colonization process followed three critical steps: population founding by the initial colonists,
arrival of secondary immigrants and consolidation of the population structure. We found a low number of genotype colonists
followed by the establishment of secondary immigrants and a slight decrease in gene flow with time. We discuss the importance
of dispersal, founder effects, natural selection, inbreeding depression and genetic drift during the colonization process
in the light of the most recent literature. |
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