Key points are not available for this paper at this time.
Robert R. Cox, Jr., Mark A. Hanson, Christianne C. Roy, Ned H. Euliss, Jr., Douglas H. Johnson, Malcolm G. Butler, Mallard Duckling Growth and Survival in Relation to Aquatic Invertebrates, The Journal of Wildlife Management, Vol. 62, No. 1 (Jan., 1998), pp. 124-133
Cox et al. (Thu,) studied this question.