. The Canadian field-naturalist. 2004 Mills and Andres: Changes in Loon and Grebe Populations in Alaska 211 Uplcinds are dominated by White Spaice (Picea glauca). Paper Birch (Betula papyrifera), and Quaking Aspen {Populus tremiiloides); Black Cottonwood {Popiihis trichocarpa) and willows {Salix spp.) are common along waterways and on alluvial plains. Maritime in- fluences moderate the climate in the Mat-Su Valley with average mid-summer temperatures of 14°C, annu- al snowfall of 150 cm, and annual precipitation of about 48 cm. We concentrated our survey effort with- in the lower Mat-Su Valley
. The Canadian field-naturalist. 2004 Mills and Andres: Changes in Loon and Grebe Populations in Alaska 211 Uplcinds are dominated by White Spaice (Picea glauca). Paper Birch (Betula papyrifera), and Quaking Aspen {Populus tremiiloides); Black Cottonwood {Popiihis trichocarpa) and willows {Salix spp.) are common along waterways and on alluvial plains. Maritime in- fluences moderate the climate in the Mat-Su Valley with average mid-summer temperatures of 14°C, annu- al snowfall of 150 cm, and annual precipitation of about 48 cm. We concentrated our survey effort with- in the lower Mat-Su Valley, an area bounded by the communities of Palmer to the southeast. Willow to the northwest, Sutton to the east, and the Susitna River to the west (Figure 1). Methods We surveyed lakes in late May and late August of 1999 to determine occupancy by loons and grebes and productivity of loons. Because of their smaller size and tendency to linger in aquatic vegetation, produc- tivity of Red-necked Grebes was not recorded. Of. 20 Kilometers Figure 1. Location of the lower Matanuska-Susitna Valley, Alaska, where lake occupancy and productivity of loons and grebes were assessed, in the delineated area, in 1987 and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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