The possible origin ofDaphnia cucullata procurva Poppe 1887 in the lakes of the Pomeranian Lakeland by hybridization in the past |
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Authors: | Ulrich Lieder |
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Institution: | (1) Institute for Inland Fisheries Research, German Democratic Republic, G.D.R., 1162 Berlin-Friedrichshagen |
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Abstract: | Besides the genusBosmina, the genusDaphnia offers considerable taxonomic difficulties due to the existence of a very great number of different morphotypes and their
intergrades. Especially the morphotypes clustering aroundDaphnia galeata Sars, 1864,D. hyalina Leydig, 1860, andD. cucullata Sars, 1862 offer a bewildering picture. In the last years an attempt has been made to understand this phenomenon mainly as
the result of hybridization and colonization of new biotopes by populations with hybridogenetic polymorphism and genotypic
diversity (founder effect). Now it will be suggested on a morphological base thatD. cucullata procurva Poppe, 1887, a unique and aberrant formtype restricted to few lakes along the river Brda in Poland, is probably an old and
stabilized hybrid originating from interspecific hybridization betweenD. galeata andD. cucullata. |
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Keywords: | zooplankton Cladocera Daphnia evolution hybridization introgression |
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