Clearance rates in the Arctic bivalves Hiatella arctica and Mya sp.

摘要: Filtration was studied in two Arctic clams, Hiatella arctica and Mya sp., collected Young Sound, Northeast Greenland. Clearance rates were determined as a function of ambient temperature algal cell concentration, using the clearance method feeding with unicellular flagellate. For both species, increased increasing from <−1 up to 4–8°C. At higher temperatures, filtration ceased clams closed their valves. also temperate specimens H. on west coast Sweden. these specimens, 0 18–20°C. When weight-specific compared between populations there no differences at 1°C. maximal concentrations corresponding 2.5–8 µg chlorophyll l-1. Temperature compensation bivalves is discussed it concluded that adaptations constant low temperatures consist lower minimum temperature, for active filtration. Low due did not seem limit growth, under prevailing conditions Sound.