Abstract
The weight-specific respiration rate (μl O 2 mg −1 AFDW h −1) of three species of leech from Lake Esrom, Denmark, Glossiphonia concolor, G. complanata and Helobdella stagnalis was measured in a closed stirred chamber with a micro electrode. At declining oxygen concentration (mg O 2 l −1) all three species expressed moderate ability to regulate respiration, in G. concolor and G. complanata down to 2 mg O 2 l −1, in H. stagnalis down to 0.75 mg O 2 l −1. Survival in anoxia was measured in closed bottles. The time to 50% survival (LD 50) was 30 days in G. concolor at 20 °C and 30 and 4 days in H. stagnalis at 10 and 20 °C, respectively. The results were discussed in relation to habitat and spatial distribution of the three species in the lake.
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