Geology topics
D. A. Barnum
Publications and source records attributed to D. A. Barnum.
Food-chain transfer of trace elements to wildlife
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Use of agricultural drainwater impoundments by snowy plovers (Charadrius alexandrinus nivosus) in the southern San Joaquin valley, California
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Characteristics of snowy plover (Charadrius alexandrinus) nest sites on agricultural drainwater evaporation ponds in the San Joaquin valley, California
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Use of agricultural drainwater impoundments by snowy plovers in the southern San Joaquin Valley, California
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Selenium levels in biota from irrigation drainwater impoundments in the San Joaquin Valley, California
Waterfowl, fish, invertebrates, and plants were collected from impoundments used for evaporating subsurface irrigation drainwater in Kings and Kern counties, California. Specimens were analyzed for trace elements with emphasis on selenium. Dry weight concentrations of total selenium ranged from 2.5 to 17 μg/g in wigeongrass, Ruppia maritima ; 7.6 to 30 μg/g in water boatmen, Corixidae ; 12 to 40 μ/g in mosquitofish, Gambusia affinis ; 86 to 100 μg/g in eared grebe, Podiceps niqricollis , livers; 14 to 120 μg/g in ruddy duck, Oxyura jamaicensis , livers; and 6.8 to 48 μg/g in northern shoveler, Anas clypeata , livers. Concentrations of dissolved selenium ranged from less than 1 to 37 μg/L during a 12-month period for inflows to the drainwater evaporation ponds.