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Effects of Human Disturbance on Breeding Least and Crested Auklets at St. Lawrence Island, Alaska

John F. Piatt, Bay D. Roberts, Wayne W. Lidster, John L. Wells and Scott A. Hatch
The Auk
Vol. 107, No. 2 (Apr., 1990), pp. 342-350
DOI: 10.2307/4087618
Stable URL: http://www.jstor.org/stable/4087618
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Human Disturbance on Breeding Least and Crested Auklets at St. Lawrence Island, Alaska
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Abstract

We studied breeding success, chick growth, and diets of Least (Aethia pusilla) and Crested (A. cristatella) auklets on St. Lawrence Island, Alaska, in summer 1987. Least Auklets had higher breeding success on control plots (50-66%) than on disturbed plots (36%). Crested Auklets had a breeding success of 42% on disturbed plots. Predation by microtine rodents and weather accounted for most natural chick mortality. Least Auklet chicks grew at a maximum rate of 4.9 g/day, and Crested Auklet chicks at 12.8 g/day. Least Auklet chicks were fed mostly copepods (Neocalanus plumchrus), whereas Crested Auklet chicks were fed Thysanoessa euphausiids.

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