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Ecology of Potamanthus myops (Walsh) (Ephemeroptera: Potamanthidae) in a Michigan stream (USA)
Authors:Mark D Munn  Robert H King
Institution:(1) Department of Biology, Central Michigan University, 48859 Mt. Pleasant, MI;(2) Present address: Department of Urban and Regional Planning, University of Illinois, 1003 W. Nevada St., 61801 Urbana, IL, USA
Abstract:The ecology of Potamanthus myops (Potamanthidae) was examined for a one year period in a central Michigan fourth order stream. Lowest nymphal densities (4.7 m-2) occurred in mid-summer after adult emergence, while highest densities were found during late summer and fall (68.0 m-2 and 66.2 m-2) after the new cohort had hatched. Biomass was the inverse of density with highest values, 67.7 mg m-2, just prior to peak adult emergence in June and lowest in late summer (16 mg m-2). Nymphs maintained a contagious spatial distribution with k values ranging between 0.19 and 1.40. P. myops nymphs fed mostly on detritus (96.8%), placing them in the collector-gatherer functional group. Nymphs were always found in erosional zones associated with rock substrate. Nymphs used their mandibular tusks for positioning themselves beneath rocks, while also appearing to use them for defensive purposes.
Keywords:Potamanthus myops            Michigan  density  biomass  distribution  ecology
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