Plasticity in filtering screens of Daphnia cucullata x galeata hybrids and parental species at two food concentrationsEffect of body size on toxicity of zinc in neonates of four differently sized Daphnia speciesOptimising survival under predation: chemical cues modify curvature in Daphnia galeataThe supposed lack of trade-off among Daphnia galeata life history traits is explained by increased adult mortality in Chaoborus conditioned treatments