Production ecology of Hexagenia limbata in Savanne Lake, Ontario

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Abstract
The population dynamics of the burrowing mayfly H. limbata was examined in Savanne Lake, a small, shallow, dark-water lake in northwestern Ontario H. limbata in Savanne Lake has a 2-yr life cycle with a larger cohort emerging on alternate years. The mean biomass (.hivin.B) varied from 0.36 g/m2 (wet weight) to 2.98 g/m2, while mean numbers varied from 34-121/m2. Annual production (P) was calculated from samples collected monthly during the period of growth for 1979 and 1980. The Allen curve, instantaneous growth and size frequency methods estimated annual production as 4.80, 4.78, and 5.59 g/m2 (wet weight), respectively. The corresponding annual P/B ratios calculated by the 3 methods were 2.1, 2.1 and 2.6.