Abstract
The study areas, Fracas Lake and Fracas Camp Meadow, were 9.5 km SSW of Jacob Lake, Coconino Co., Arizona (SW?, SE?, Sec. 1, T37N, R1E, elev. 2,507 m). The two sites were 0.25 km apart, separated by a stand of Pinus ponderosa and Populus tremuloides. Fracas Lake was a 0.4ha natural limestone sinkhole lake, surrounded by Petran montane conifer forest consisting of mature stands of P. ponderosa with a few mature P. tremuloides. The lake was permanent and varied in depth seasonally from 0.75 to 1.75 m. A floating mat of rushes (Scirpus sp.) rising 1 m from the surface of water covered half of the lake
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