Production of the amphipod Hyalella azteca (Saussure) in a northern Ontario lake

Publisher Website
Google Scholar
Abstract
Annual production of the amphipod, H. azteca, was estimated in 3 habitats of the upper littoral zone of Dock Lake, Ontario, over a 2 yr period (1980-1981). Cohort production (P) by the size frequency method was 1.39 g/m2 (dry wt), mean annual biomass (.hivin.B) was 0.36 g/m2 and the P/.hivin.B ratio was 3.9 for the 1980 year class. Five other methods for estimating production were applied to this cohort, providing comparable estimates ranging from 1.21 (instantaneous growth) to 1.65 (cohort G) g/m2. Size frequency estimates of annual production for 1980 and 1981 were 1.24 and 1.40 g/m2, respectively). The annual P/.hivin.B ratios of 3.9 and 4.0 for these 2 yr agree with the cohort value. A comparison of production estimates for H. azteca in the literature shows a gradient of production which correlates with the habitat temperature regimen.