Respiratory adaptations to oxygen lack in three species of Glossiphoniidae (Hirudinea) in Lake Esrom, Denmark
2005; Elsevier BV; Volume: 35; Issue: 1-2 Linguagem: Inglês
10.1016/j.limno.2004.12.001
ISSN1873-5851
AutoresBettina Pohle, Kirsten Hamburger,
Tópico(s)Radioactive contamination and transfer
ResumoThe 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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