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PCA of the Daphnia taxonomic composition in 11 analysed reservoirs, based on the data from the three sampling stations along the longitudinal reservoir axes from both 2004 and 2005 (data from different depth layers at the dam were combined together). Black triangles, reservoirs; grey squares, sampling stations; open circles, different seasons. Taxa of the D. longispina complex are indicated by arrows. The first two principal axes explain 82% of the total variation.
