Waterfowl and their food plants in the Sandhill region of Nebraska . BULLETIN No. 794 Contribution from the Bureau of Biological SurveyE. W. NELSON, Chief J^^^J-U. Washington, D. C. PROFESSIONAL PAPER. March 23, 1920 WATERFOWL AND THEIR FOOD PLANTS INTHE SANDHILL REGION OF NEBRASKA. By Harry C. Oberholser and W. L. McAtee, Assistant Biologists. CONTENTS. Page. Geneeal Introduction Part I.—Waterfowl in Nebraska : Introduction Effect of Federal protective laws Future of waterfowl in the sand-hill region Natural enemies Hunting grounds Waterfowl hunting in the autumn of 1915 General description o
Waterfowl and their food plants in the Sandhill region of Nebraska . BULLETIN No. 794 Contribution from the Bureau of Biological SurveyE. W. NELSON, Chief J^^^J-U. Washington, D. C. PROFESSIONAL PAPER. March 23, 1920 WATERFOWL AND THEIR FOOD PLANTS INTHE SANDHILL REGION OF NEBRASKA. By Harry C. Oberholser and W. L. McAtee, Assistant Biologists. CONTENTS. Page. Geneeal Introduction Part I.—Waterfowl in Nebraska : Introduction Effect of Federal protective laws Future of waterfowl in the sand-hill region Natural enemies Hunting grounds Waterfowl hunting in the autumn of 1915 General description of the sand-hill region 10 Part I—Continued. Annotated list of birds Game birds Nongame birds Part II.—Wild-Duck Foods of theSandhill Region of Nebraska : Introduction Improvement of the wild-duck food supply Effect of alkaline conditions on duck-food plants List of plants of the sandhill lakes List of lakes visited 37 38 38 40 40 GENERAL INTRODUCTION. Throughout the United States the draining of marshes and shallowlakes has proved during recent years a menace to the preservation ofwaterfowl. Many of these lakes were formerly the homes of c
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