Publication Type: | Journal Article |
Year of Publication: | 1962 |
Authors: | Hunter, WF, Baldwin, PH |
Journal: | The Wilson Bulletin |
Volume: | 74 |
Issue: | 4 |
Date Published: | 1962 |
ISBN Number: | 00435643 |
Keywords: | Apodidae, Apus, Apus apus, Cypseloides, Cypseloides niger, Nephoecetes, Nephoecetes niger, Niger |
Abstract: | Nesting of the Black Swift in northwestern Montana was established with the finding of a colony in the Mission Valley of the Mission Range, where five active nests at a waterfall were studied. The presence of adults elsewhere in the Mission Range and in the Glacier Range strongly suggests that other colonies remain to be discovered. The nestings studied in Montana were started earlier than those reported in Colorado, contrary to expectations based on Hopkins' Bioclimatic Law. The downy covering developed early in the nestling period may represent a secondary adaptation to the semiexposed nesting niche. Nestings in Montana differed from those in Colorado in their greater exposure to sunshine and lower elevation. Nesting failures appear to be common in the Black Swift. |
URL: | http://www.jstor.org/stable/4159102 |
Short Title: | The Wilson Bulletin |
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