Jackson Estuarine Laboratory

Seasonal patterns of production in the sandy-beach amphipod Haustorius canadensis☆


The Haustorius canadensis population at Long Sands beach in southern Maine was studied over a period of 45 months. The length-weight relationship was examined over 24 months; it showed no difference due to either sex or month. Caloric content of the population displayed a seasonal cycle around a mean of 18·381 KJ gm−1 dry weight, peaking in mid to late summer. The increment summation, instantaneous growth, removal summation and size-frequency methods of calculating production were used and the results compared. The increment summation and instantaneous growth methods provided the best estimates of production, averaging 98·1 gm m−1 y−1 and 100·2 gm m−1 y−1, respectively. The annual production to mean biomass ratio averaged 1·48. The population exhibited strong peaks of production; the four summer months accounting for 4·65 times the production during the remainder of the year. Most of the production was due to one-year-old individuals.

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Estuarine, Coastal and Shelf Science

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Copyright © 1986 Published by Elsevier Ltd.