. The Canadian field-naturalist. 278 The Canadian Field-Naturalist Vol. 96 TUNDRA. RB FOREST EDGE Figure 4. Distribution of birds on forest edge and tundra along Herriot Creek on 26 June 1957. Broken lines represent boundaries of ponds and arrows show directions of bird flights. BW — Blackpoll Warbler RA CG — Canada Goose, Branta canadensis RB F — Common Flicker RP FS — Fox Sparrow SL GT — Gray-cheeked Thrush SP HS LL LY Gray-cheeked Thrush Harris' Sparrow Lapland Longspur, Calcarius lapponicus Lesser Yellowlegs NP — Northern Phalarope NW R Northern Waterthrush American Robin SPS ss TS W ws Co
. The Canadian field-naturalist. 278 The Canadian Field-Naturalist Vol. 96 TUNDRA. RB FOREST EDGE Figure 4. Distribution of birds on forest edge and tundra along Herriot Creek on 26 June 1957. Broken lines represent boundaries of ponds and arrows show directions of bird flights. BW — Blackpoll Warbler RA CG — Canada Goose, Branta canadensis RB F — Common Flicker RP FS — Fox Sparrow SL GT — Gray-cheeked Thrush SP HS LL LY Gray-cheeked Thrush Harris' Sparrow Lapland Longspur, Calcarius lapponicus Lesser Yellowlegs NP — Northern Phalarope NW R Northern Waterthrush American Robin SPS ss TS W ws Common Raven Rusty Blackbird Redpoll Smith's Longspur, Calcariuspictus Semipalmated Plover, Charadrius semipalmatus Semipalmated Sandpiper, Calidris pusilla Savannah Sparrow Tree Sparrow Whimbrel, Numenius phaeopus White-crowned Sparrow fied since high Ss and Sp (Table 3) indicated that these bird faunas were more similar than they were differ- ent. Waterbirds and visitors were excluded at all localities. Forest-tundra faciation (Subarctic) Census data were compared for five other areas in the forest-tundra faciation. Areas to the northwest included a mature lichen woodland of Black Spruce, White Spruce, Jack Pine, and Paper Birch east of Great Slave Lake (Harris et al. 1974); three plots in Black Spruce, White Birch, and Tamarack west of Great Slave Lake (Carbyn 1971); and a variety of communities containing Black Spruce, Tamarack, White Birch, and several species of scrub trees and shrubs west of Great Bear Lake(Ebeletal. 1975). The Gillam area, censused by us, lies to the south and three Black Spruce plots at Big Trout Lake, Ontario (Lee and Speirs 1977), are to the southeast. There was a decline in richness of fauna to the northwest and an increase to the southeast (Table 4). Population levels (pairs per 40 ha) were lowest in the extreme northwest and highest in the extreme south- east. Similarity values {Ss, Sp) were higher between. Please note that these images
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