Methods for estimating secondary production in marine Amphipoda

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Abstract
For the 1971 year-class of Pontoporeia femorata from St. Margaret''s Bay, Nova Scotia [Canada], secondary production was 11.06-13.61 g wet weight/m2 and annual turnover ratio was 3.64-4.78 as measured by 3 methods. These included cohort summation of losses, integrated production from the Allen curve and size frequency, or modified Hynes methods. Sampling bias against early life history stages of amphipods collected with sieve meshes .gtoreq. 0.8 mm2 can be corrected by back calculation from population data thus enabling cohort-based estimates of secondary production to be made.