Differential behaviour and shifts in genotype composition during the beginning of a seasonal period of diel vertical migration |
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Authors: | Spaak Piet Ringelberg Joop |
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Affiliation: | (1) Department of Limnology, EAWAG/ETH, Ueberlandstrasse 133, 8600 Dübendorf, Switzerland;(2) Netherlands Institute of Ecology, Centre for Limnology and University of Amsterdam, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands |
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Abstract: | During the first few weeks of a recurring seasonalperiod of diel vertical migration in Lake Maarsseveen(The Netherlands), part of the hybrid Daphniagaleata × hyalina population migrated, whileanother part remained in the epilimnion. In theepilimnion, 0+ perch prey upon daphnids duringdaytime. Gradually, the number of adult Daphniain the epilimnion decrease until the epilimnion isnearly devoid of daphnids. The population as a wholemay decrease, as in 1991, or may increase asin 1992. Genotype composition, as determined byallozyme analysis, changed substantially within afortnight in 1992, and one genotype became dominant.Our data are in agreement with the hypothesis thatpredation on different genotypes (clones)occurs during the beginning of a seasonal period ofdiel vertical migration, though our data do not allowto exclude alternativeexplanations. |
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Keywords: | Daphnia 0+ perch genotypes selective predation allozyme analysis |
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