Global ETD Search
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Showing 1 to 4 of 4 for “"cliff swallows"”.
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Niche segregation among three sympatric species of swallows in southern Ontario
Barn Swallows (Hirundo rustica), Cliff Swallows (Petrochelidon pyrrhonota) and Tree Swallows (Tachycineta bicolor) breed sympatrically in southern Ontario but it is unclear how these species differ ecologically, and their coexistence implies niche segregation. I investigated potential interspecific …
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Niche Differentiating Mechanisms in Two Sympatric Species of Swallows
… considers certain aspects of the ecologies of cliff swallows (Petrochelidon pyrrhonota) and bam swallows (Hirundo rustica) in an area of overlap, where both species are found nesting together and foraging over the same fields. Careful attention was given to foraging flight patterns, foraging …
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Evolution in the Cornbelt : how a few special species are adapting to industrial agriculture
… prairie? Here are the stories of three species-cliff swallows, western corn rootworms, and prairie deer mice-that natural selection has reshaped to thrive in the new agricultural landscape. With his finches, Charles Darwin read the record of evolution in the past. In the Corn Belt, today's …
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A Quantitative Analysis of the Geomorphic Agency of the Mud-Nesting Swallows in Central Texas
… deposition conducted by the three mud-nesting swallows of Central Texas, namely the barn swallow (Hirundo rustica), the cave swallow (Petrochelidon fulva), and the cliff swallow (Petrochelidon pyrrhonota). The study area for this research is within the city limits of San Marcos, Texas, which …