Bay D. Roberts Wayne W. Lidster John L. Wells Scott A. Hatch John F. Piatt 1990 <p><span>We studied breeding success, chick growth, and diets of Least (</span><i>Aethia pusilla</i><span>) and Crested (</span><i>A. cristatella</i><span>) 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 (</span><i>Neocalanus plumchrus</i><span>), whereas Crested Auklet chicks were fed </span><i>Thysanoessa</i><span> euphausiids.</span></p> application/pdf 10.2307/4087618 en American Ornithological Society Effects of human disturbance on breeding Least and Crested Auklets at St. Lawrence Island, Alaska article