Population dynamics of benthic foraminifera; results from the Exe Estuary, England

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Abstract
The dominant foraminiferal species living in the slightly brackish environment of the lower Exe estuary is Nonion depressulus. Samples collected monthly from Jan. 1979 until July 1981 provided data on the population dynamics of this species. From the size distribution patterns, it is possible to recognize 8 or 9 reproductive phases per yr. Growth proceeds at the rate of 30-40 .mu.m/mo. for a period of .apprx. 4 mo. After this time most individuals reproduce, but a few survive to an age of .apprx. 8 mo. Mortality is > 60% in the 1st mo. and most individuals have died or reproduced within .apprx. 4 mo. Production was estimated by 4 different methods, 3 of which give values of .apprx. 144 tests/10 cm2 per yr. This is low compared with results from elsewhere. The annual production of biomass, 0.1267 mm3/10 cm2, is low. The interpretation of the relationships between living and dead assemblages is dependent on an understanding of population dynamics in general and the rate of production of tests in particular.

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