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- W1970891412 abstract "I studied American avocets (Recurvirostra americana) nesting on artificial islands in southeastern Alberta from 1976 to 1978 and in 1980. I found a total of 383 nests on 101 (53%) of the 191 islands searched. Solitary nesting occurred on 31 (16%) of the islands, whereas more than two nests were established on 70 (37%) islands. The average size of the colonies was 5.0 nests with a maximum of 18. Avocets appeared to prefer islands covered with the greatest amount of sparse vegetation and those surrounded by deeper water. Island use was greater during a drought in 1977 than during 1976 or 1978, when average weather conditions prevailed. The use of artificial islands by nesting avocets increases the benefits of this management technique originally designed for nesting waterfowl. The most frequent clutch size was four eggs. However, 15.4% of nests had six to eight eggs, possibly because two females laid their eggs in the same nest. These superclutches occur more frequently in the northern part of the avocet breeding range than in areas located at lower latitudes. I found the smallest percentage of superclutches in 1977, the drought year. Nest density was higher on islands with six- to eight-egg clutches than on those with only single clutches. Distances to the nearest conspecific nest and to the nearest shoreline did not differ between single and superclutches." @default.
- W1970891412 created "2016-06-24" @default.
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- W1970891412 date "1985-06-01" @default.
- W1970891412 modified "2023-09-26" @default.
- W1970891412 title "Nest sites and superclutches of American avocets on artificial islands" @default.
- W1970891412 doi "https://doi.org/10.1139/z85-196" @default.
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