The shallow-water soft-bottom benthos in Lindåspollene, western Norway

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Abstract
After an initial sampling in June 1972 six shallow-water (less than ten meters depth) soft-bottom stations in Lindåspollene, western Norway, were sampled monthly from September 1972 to October 1973. The major objective was to determine parameters for dividing the macro-infaunal species into size groups for study of population dynamics. In addition, measurements giving a reasonable correlation to standing stock were sought. Measurements useful as estimators of standing stock were determined for 12 species. Total length proved to have a good correlation with ash-free dry weight for five polychaete species while partial length and partial ash-free dry weight were chosen as estimators of biomass for two other species. Shell length was the parameter decided upon for the one gastropod and five lamellibranch species, both as an estimator of standing stock and as a unit for size classes. Length is suggested as an estimator of biomass for one echinoid species, although there was insufficient data to quantify the relationship. For the one holothurian species present no good estimator of biomass was found, although total ash-free dry weight was used with some success as a unit for dividing the population into size groups.