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Age-Related Differences in the Flocking and Foraging Behavior of White Ibises in a South Carolina Salt Marsh

Keith L. Bildstein
Colonial Waterbirds
Vol. 6 (1983), pp. 45-53
Published by: Waterbird Society
DOI: 10.2307/1520966
Stable URL: http://www.jstor.org/stable/1520966
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.
Age-Related Differences in the Flocking and Foraging Behavior of White Ibises in a South Carolina Salt Marsh
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Abstract

During July and August 1980, 1981, and especially 1982 I studied the flocking and foraging behavior of adult and juvenile White Ibises in a South Carolina salt marsh. Adults were more numerous than were juveniles throughout the study site and certain portions of the marsh had extremely low ratios of juveniles to adults. Almost all ibises fed in flocks that ranged from 2 to 78 individuals. In most feeding flocks juveniles were outnumbered by adults and they usually fed on the periphery of the flock. Juveniles tended to arrive on and depart from the marsh with other juveniles and to remain near juveniles as they fed. Juveniles flew on and off the marsh in larger flocks than did adults and they flew to evening roosts later than adults did. Paired observations show that even when adults and juveniles fed side-by-side, juveniles were still significantly less successful than were adults.

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