JPR Advance Access originally published online on May 14, 2007
Journal of Plankton Research 2007 29(7):619-628; doi:10.1093/plankt/fbm044
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Spatial distribution of the Daphnia longispina species complex and other planktonic crustaceans in the heterogeneous environment of canyon-shaped reservoirs
1 Biological Centre as CR, Institute of Hydrobiology, NA SádkÁch 7, CZ-37005 
eské Bud
jovice, The Czech Republic
2 Department of Ecology, Faculty of Science, Charles University in Prague, Vini
ná 7, CZ-12844 Prague 2, The Czech Republic
3 Faculty of Biological Sciences, University of South Bohemia, Brani
ovská 31, CZ-37005 eské Budjovice, The Czech Republic
* Corresponding Author: seda{at}hbu.cas.cz
Received on January 4, 2007; accepted on April 27, 2007
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Abstract |
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Canyon-shaped reservoirs are often characterised by longitudinal gradients of environmental factors (including trophic level, phytoplankton and zooplankton biomass and abundance of planktivorous fish) affecting the taxonomic composition of the pelagic community. We tested the hypothesis that the spatial distribution of different species and interspecific hybrids of the Daphnia longispina species complex is non-random under such conditions. During the summer stratification, we sampled crustacean zooplankton from 11 reservoirs, covering both longitudinal (upstream, middle, dam) and vertical (epi-, meta- and hypolimnion) environmental gradients. Allozyme electrophoresis was used to discriminate among different Daphnia taxa. All three frequently hybridizing European species of the complex (galeata, cucullata, longispina = hyalina) and hybrids with Daphnia galeata were commonly recorded. Smaller-bodied Daphnia cucullata and its hybrids, when present, preferred mostly the nutrient- and food-rich upstream regions; D. longispina and its hybrids were more commonly found in the downstream part, and often dominated in the meta- or hypolimnion. Redundancy analyses confirmed significant differences in the Daphnia taxon composition, as well as in spatial distribution of other crustacean species, along both gradients. For the first time, we demonstrate regular patterns in the horizontal distribution of Daphnia species and hybrids within a water body, thus accepting our hypothesis. Such spatial distributional patterns may strongly impact local hybridization processes.
Communicating editor: K.J. Flynn
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