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Communication at the NABS Annual meeting, Keystone, 2000
(369) SESTON AVAILABILITY AND LARVAL DEVELOPMENT OF ANTHOPOTAMUS MYOPS (WALSH) IN AN AGRICULTURAL STREAM IN WEST-CENTRAL MINNESOTA.
A.R. Elness and T.M. Anderson. Division of Science and Math, University of Minnesota, Morris, Morris, MN 56267
Anthopotamus spp. feed by filtering fine particulate organic matter from the water column and benthic sediments. We investigated the life history of the mayfly Anthopotamus myops (Ephemeroptera: Potamanthidae) and seston availability in the Pomme de Terre River, a mid-sized agricultural stream in west-central Minnesota to evaluate the relationship between food availability and its life cycle pattern. Mayfly larvae were collected monthly and body length, head capsule width and interocular width of each specimen were measured. Adults of A. myops emerged from June until late August and larvae of several different size classes were collected on all sampling dates, indicating a nonseasonal life cycle. Seston levels were determined monthly by collecting and filtering water samples from above the water-substrate interface. The organic matter content of the samples was determined by weighing filters before and after combustion. Seston levels decreased steadily throughout the summer and fall with an average of 32.1 mg/l (SE = 13.25) for July versus an average 2.0 mg/l (SE = 0.5) in November. These results suggest that seasonal fluctuation in seston availability may influence larval development of A. myops.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Life History Characteristics
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