Temperature responses of Ceriodaphnia quadrangula (O.F. Müller, 1785) (Anomopoda) from the littoral of the Rybinsk Reservoir

Abstract

Experiments have been conducted to determine the final preferred temperature (FPT) and avoided temperatures in cladoceran Ceriodaphnia quadrangular (O. F. Müller, 1785) from the littoral of the Rybinsk Reservoir. The graphic method is used to analyze the experimental data. In the study during the veg etation season the following parameters are determined: range of selected (preferred) temperatures (17.4-26.5°C) corresponding to the optimum temperatures for growth and development of cladocerans in the waterbodies, the temperature zone of normal vital activity (13.0-27.0°C), ranges of avoidance temperatures (6.0-13.0°C and >27.0°C), and lethal temperatures (<6.0 and >33.0°C). The possible reasons and mecha nisms of temperature responses in cladocerans are discussed.