Northern Prairie Wildlife Research Center
BELL, J. F., G. W. SCIPLE, and A. A. HUBERT. 1955. A microenvironment concept of the epizootiology of avian botulism. J. Wildl. Manage. 19:352-357. COTTAM, C. 1939. Food habits of North American diving ducks. U.S. Dep. Agric. Bull. 643. 140pp. DOWNING, J. A. 1979. Aggregation, transformation, and the design of benthos sampling programs. J. Fish. Res. Board Can. 36:1454-1463. DUNCAN, R. M., and W. I. JENSEN. 1976. A relationship between avian carcasses and living invertebrates in the epizootiology of avian botulism. J. Wildl. Dis. 12:116-126. ELLIOTT, J. M. 1977. Some methods for the statistical analysis of samples of benthic invertebrates. Freshwater Biol. Assoc. Sci. Publ. No. 25. 159pp. EULISS, N. H., JR., and S. W. HARRIS. 1987. Feeding ecology of northern pintails and green-winged teal wintering in California. J. Wildl. Manage. 51:724-732. _____, and G. A. SWANSON. 1989. Improved self-cleaning screen for processing benthic samples. Calif. Fish and Game 75:126-128. GRUE, C. E., M. W. TOME, T. A. MESSMER, D. B. HENRY, G. A. SWANSON, and L. R. DEWEESE. 1989. Agricultural chemicals and prairie pothole wetlands: meeting the needs of the resource and the farmer-U.S. perspective. Trans. North Am. Wildl. Nat. Resour. Conf. 54:43-58. JENSEN, W. I., and J. P. ALLEN. 1960. A possible relationship between aquatic invertebrates and avian botulism. Trans. North Am. Wildl. Nat. Resour. Conf. 25:171-181. MARTIN, A. C., and F. M. UHLER. 1939. Food of game ducks in the United States and Canada. U.S. Dep. Agric. Bull. 634. 157pp. MERRITT, R. W., and K. W. CUMMINS. 1984. An introduction to the aquatic insects of North America. Second ed. Kendall-Hunt Publ. Co., Dubuque, Ia. 441pp. REINECKE, K. J., and R. B. OWEN, JR. 1980. Food use and nutrition of black ducks nesting in Maine. J. Wildl. Manage. 44:549-558. RESH, V. H. 1979. Sampling variability and life history features: basic considerations in the design of aquatic insect studies. J. Fish. Res. Board Can. 36:290-311. SWANSON, G. A. 1978a. A water column sampler for invertebrates in shallow wetlands. J. Wildl. Manage. 42:670-672. _____. 1978b. Funnel trap for collecting littoral aquatic invertebrates. Prog. Fish-Cult. 40:73. _____. 1978c. A simple lightweight core sampler for quantitating waterfowl foods. J. Wildl. Manage. 42:426-428. _____. 1983. Benthic sampling for waterfowl foods in emergent vegetation. J. Wildl. Manage. 47:821-823. _____, and J. C. BARTONEK. 1970. Bias associated with food analysis in gizzards of blue-winged teal. J. Wildl. Manage. 34:739-746 _____, G. L. KRAPU, and J. R. SERIE. 1979. Foods of laying female dabbling ducks on the breeding grounds. Pages 47-57 in T. A. Bookhout, ed. Waterfowl and wetlands - an integrated review. Proc. Symp. North Cent. Sect., The Wildl. Soc. Madison, Wis. WARD, H. B., and G. C. WHIPPLE. 1959. Freshwater biology. Second ed. John Wiley and Sons, New York, N.Y. 1248pp.