Article Abstract:
A dorsal subcutaneous method for implanting a heart rate biotelemetry transmitter is described. The device is used to measure the heart rate fluctuations of black ducks when a simulated aircraft noise in a big outdoor facility is introduced. Findings reveal that daily mean heart rates did not rise due to noise. However, with increased frequency during the first day of noise presentation, heart rate rose sharply although these responses dropped quickly in subsequent days. Therefore, black ducks can get used to the noise produced by low altitude aircraft overflights.
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Article Abstract:
A study of Orioles collected from Cimarron and Smoky Hill rivers, Cimarron River, Kenton, and central Kansas fails to reveal any change in the center or width of their hybrid zone since the 1970s. Selection against Bullock's Orioles east of the zone and Baltimore Orioles west of it limites hybridization. Bullock's Orioles tolerate higher temperatures than Baltimore Orioles. A small proportion of Baltimore and hybrid Orioles migrate into the western Smoky Hill area more often than Bullock's Orioles.
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Article Abstract:
A bioenergetics model to assess the total fish intake of pisicivorous waterbirds, including migrant birds such as Red-breasted Merganser, revealed their per annum intake of fish from the western Lake Erie, NY, to be 13,368 tons, which is approximately one-seventh of the prey fish biomass needed to sustain the walleyes in the lake for one full season. Prominent nesting species in the lake included the Herring Gull, the Ring-billed Gull and the Great Egret.
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