Abstract
tion to their winter and spring condition, without having to catch or kill them. My study involved the assessment of marked individuals only, but the technique could be used to estimate the breeding potential of unmarked populations or to examine the performance of geese on different habitats or sites. For example, a group of greater snow geese (Anser caerulescens atlanticus) in an area where much of the feeding was on agricultural land had higher indices (median test P < 0.01) than those that had, on the same day, fed exclusively on Scirpus marsh. Acknowledgments.--I thank A. Dekker, N. Gullestad, M. Nugent, P. Reynolds, and A. K. M. St. Joseph for help in collecting data on abdominal profiles. J. Blossom and C. Prentice drew the figures, and G. V. T. Matthews made useful criticisms on a draft of the manuscript. The overseas work was aided by grants from the North Atlantic Treaty Organization and The Royal Society. LITERATURE CITED
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