Survival, osmoregulatory ability, and respiration of Idotea chelipes (Crustacea, Isopoda) from Lake Veere in different salinities and temperatures

1. An ecological and physiological study ofI. chelipes from Lake Veere, The Netherlands, was made. 2. Both osmoregulatory capacity and survival decrease with increasing temperature as well as with decreasing salinity. 3. Respiration experiments suggest that the need of energy by osmoregulatory activity may be supplied at the cost of other physiological processes, at any rate at temperatures of 10°C and higher. 4. It may be expected that, if temperatures higher than 15°C and salinities lower than 8‰ coincide, the population ofI. chelipes will be affected negatively.