Differences in genetic structure and ecological diversity between parental forms and hybrids in a Daphnia species complex |
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Authors: | Jakob Müller Alfred Seitz |
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Institution: | (1) Department of Population Biology, Zoological Institute of the University, Saarstr. 21, 55099 Mainz, Germany |
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Abstract: | Hybridization is a common phenomenon in Daphnia species complexes. Hybrids often dominate in Daphnia populations; therefore it is worthwhile to look for principal differences between parental and hybrid populations with respect to their genetic structure and clonal differentiation. We studied natural populations of members of the Daphnia galeata/hyalina/cucullata complex in three lakes. In one of these lakes, one parental species (D. galeata) and one hybrid (D. galeata × cucullata) were investigated more intensively. The frequency of sexual reproduction was higher in parental populations, whereas clonal diversity was higher in hybrid populations. Ecological differentiation among clonal groups was more pronounced in the D. galeata × cucullata hybrid compared to D. galeata, whereas selection intensity was weaker. These results are discussed with respect to stability of clonal groups, multiple hybridizations and selective constraints. |
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Keywords: | clonal diversity Daphnia hybrids mode of reproduction parentals spatial heterogeneity temporal heterogeneity |
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