. The Canadian field-naturalist. A^ ^ o<z 50 100 150 yu \cof ^FORT YUKON " I CIRCLE. TANANA ?^ FAIRBANKS â :s EAGLE â¢/ â¢HEALY DELTA JUNCTION, ^^^c ^^ ^.^y. A- TOK A/ 0 TETLIN UKE 150" 14ff 145' 144- Figure 1. Map of east-central Alaska, showing areas referred to in the text. nesting in abandoned nests of Black-billed Magpies, Pica pica (Dixon 1938; Laing 1985), nests of other corvids (Palmer 1988b), tree cavities (Bent 1937), and on the ground. The prevalence of nests in parasitic grov^^ths is interesting but may simply reflect substrate limita- tions, because stick nests such a
. The Canadian field-naturalist. A^ ^ o<z 50 100 150 yu \cof ^FORT YUKON " I CIRCLE. TANANA ?^ FAIRBANKS â :s EAGLE â¢/ â¢HEALY DELTA JUNCTION, ^^^c ^^ ^.^y. A- TOK A/ 0 TETLIN UKE 150" 14ff 145' 144- Figure 1. Map of east-central Alaska, showing areas referred to in the text. nesting in abandoned nests of Black-billed Magpies, Pica pica (Dixon 1938; Laing 1985), nests of other corvids (Palmer 1988b), tree cavities (Bent 1937), and on the ground. The prevalence of nests in parasitic grov^^ths is interesting but may simply reflect substrate limita- tions, because stick nests such as those constructed by magpies and used regularly by Merlins in Denali National Park (Laing 1985) are rare or absent in this region. Parasitic growths, on the other hand, are abundant in this region. Additionally, the value of these growths to Merlins may increase markedly if they are modified by a species such as the Red Squirrel {Tamiasciurus hudsonicus). Four of the nests that were located in parasitic growths may have been used previously by Red Squirrels. Bent. 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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Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
