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Erscheinungsdatum: 1985
Anbieter: ConchBooks, Harxheim, Deutschland
The distribution of Macoma balthica in Cumberland Basin and Shepody Bay is very patchy and the zone of greatest abundance consistently occurs near the upper mudflat boundary where exposure time is greatest. The primary factors influencing distribution appear to be food availability, sediment stability and mortality. Sediment properties appear to play a minor role in this environment. Ice scour, sediment instability, predation and possibly high temperatures contribute to the high specific mortality rate (?0.5 y?1) resulting in a maximum age of 5 years. Growth and reproductive cycles of Macoma are the same as observed elsewhere except that lower winter temperatures delay growth to a few months between May and August. Annual Macoma production, averaged over several entire mudflats, is 0.5 and 3.9 g flesh dry weight m-2 for Cumberland Basin and Shepody Bay respectively, or 10 and 50% of the estimated total macrofauna production. 12 pp., 5 figs, gr. 8.