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1. Climate warming may cause disruption of trophic linkages in aquatic ecosystems and lead to changes in abundance and genetic structure of zooplankton populations. We monitored the community of the Daphnia galeata‐hyalina hybrid complex in the Saidenbach Reservoir (Saxony, Germany) using allozyme electrophoresis for three consecutive years (2005–07), including one (2007) following an unusually warm...
Thermal acclimation in Daphnia magna was studied on various levels to test the recent “oxygen-limited thermal tolerance” hypothesis. Preference behaviour in a thermal gradient was determined by both, ambient temperature and corresponding oxygen concentration. Swimming activity depended on aerobic energy provision and reflected the match or mismatch of oxygen supply and energy demand at different ambient...
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