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Full-Text Articles in Social and Behavioral Sciences
Book Review: Statistics In Omithology, Douglas H. Johnson
Book Review: Statistics In Omithology, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
This book, the 29th in Springer-Verlag's Lecture Notes in Statistics series, arose from a one-day meeting held in London in 1982. All but two of the papers presented at that meeting are included, as are additional papers not given in London. Refereeing was done by the two editors.
Are Mallards Declining In North America?, Douglas H. Johnson, Terry L. Shaffer
Are Mallards Declining In North America?, Douglas H. Johnson, Terry L. Shaffer
USGS Northern Prairie Wildlife Research Center
Whether mallard (Anas platyrhynchos) numbers have declined in recent years has been a subject of concern and debate among waterfowl biologists, wildlife managers, and administrators. Further controversy surrounds the reason for the presumed decline. One opinion holds that the decline, if it exists, is simply a reflection of a dry period, with fewer ponds available to support mallards. The opposing view is that mallards have declined more severely than wetland numbers, and have not responded to subsequent improvements in wetlands.