. The Canadian field-naturalist. 2004 PoHL, Langor, Landry, and Spence: Lepidoptera Near Lac La Biche 531. ALBERTA 100 km boreal mixedwood Figure 1. Extent of the boreal mixed wood ecoregion in Alberta and location of the study area. older than the planned stand rotation age (60-70 years) for Alberta aspen forests. A comparison between these two stands, based on the light trap catches of Lepi- doptera described here, has been done elsewhere (Pohl et al. 2004). Two 30 watt UV traps were run in each stand, from dusk to dawn for one night approximately every two weeks, from 16 June to 16 Septembe
. The Canadian field-naturalist. 2004 PoHL, Langor, Landry, and Spence: Lepidoptera Near Lac La Biche 531. ALBERTA 100 km boreal mixedwood Figure 1. Extent of the boreal mixed wood ecoregion in Alberta and location of the study area. older than the planned stand rotation age (60-70 years) for Alberta aspen forests. A comparison between these two stands, based on the light trap catches of Lepi- doptera described here, has been done elsewhere (Pohl et al. 2004). Two 30 watt UV traps were run in each stand, from dusk to dawn for one night approximately every two weeks, from 16 June to 16 September in 1993, 3 May Table 1. Abundance and diversity of three groups of Lepi- doptera collected near Touchwood Lake, Alberta. Butterflies include the superfamilies Hesperioidea and Papilionoidea; macro-moths include the superfamilies Lasiocampoidea, Bombycoidea, Drepanoidea, Geometroidea, and Noctuoidea; micro-moths comprise all other superfamilies. Group Number of Specimens (Proportion) Number of Species (Proportion) micro-moths macro-moths butterflies 3897 7163 51 () () () 201 229 () () () total 11 111 438 to 5 October in 1994, and 28 May to 28 in 1995. Traps were hung at approximately m from the ground, and activated from dusk until dawn. These samples were augmented by periodic hand collecting at portable UV lights, and a small amount of net col- lecting of day-flying species. Specimens were identi- fied using a wide array of taxonomic publications, and by comparing to specimens in the Canadian Forest Service's Northern Forestry Centre Research Collec- tion (NFRC) in Edmonton, Alberta, and the Canadian National Collection (CNC) in Ottawa, Ontario. Vouch- er specimens have been deposited at the NFRC and CNC. To obtain an estimate of the total size of the Lepi- doptera community in the study area, a Chao-1 estimate of diversity (Chao and Lee 1992) was calculated as described by Colwell and Coddington (1994). Results A total of 11 111 spe
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