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Spatial and temporal heterogeneity of Daphnia in Lake Constance; intra‐ and interspecific comparisons.
Author(s) -
Stich Hans Bernd
Publication year - 1992
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1992.37.6.1327
Subject(s) - daphnia , daphnia galeata , cladocera , biology , interspecific competition , taxon , water column , ecology , zoology , branchiopoda , hybrid , seasonality , zooplankton , botany
Allozymic surveys of the Daphnia galeata-hyalina species complex in Lake Constance (Bodensee) examined seasonal variation in daytime vertical distributions of Daphnia galeata (G), Daphnia hyalina (H), and G x H hybrids. During summer and early autumn, G was the dominant taxon in the upper 20 m of the water column, while H and G x H were most abundant below 30 m. From November until April, all three taxa were homogeneously distributed in the water. Seventeen distinct G clones were detected during the study, while six G x H clones and five H clones were detected. Single clones of G × H and H accounted for 93% (400/431 and 400/434, respectively) of the total number sampled. Results reconfirm previous studies, which observed spatial (vertical) separation of G and H, and confirm previous suspicions as to the existence of G x H hybrids in the lake.