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RESULTS AND DISCUSSION
Value of University Bay as a Refuge
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American wigeon American winter population aquatic vegetation Atlantic Flyway Bay refuge Bay use UB Bellrose black duck Breeding Population Index bufflehead canvasback Carpenter 1979 communities coontail coot correlated crossing Wisconsin dabblers decreased distribution disturbance divers diving duck duck-use days early Eurasian watermilfoil eutrophication feeding floating-leaved fluctuations Flyway Harvest Index Flyway Winter Population gadwall Goldeneye habitat change Harvest Index MFK hooded merganser indices invertebrate Jahn and Hunt Lake Mendota large numbers late Lind and Cottam macrophytes mallard and black Manage migration Mississippi Flyway Harvest Mississippi River Refuge Myriophyllum spicatum native vegetation Nielsen Marsh North American winter nutrient occurred Picnic Point pondweeds population levels redhead reduced Refuge use UMR relative ring-necked duck scaup Second Bay shallow shoveler silt siltation species composition standardized Mississippi Flyway study area teal transect trend turbidity University Bay Upper Mississippi River urban Vallisneria americana vegetative decline waterfowl wetlands wild celery Wildl Wildlife Willow Creek Winter Population Index zone