Geology topics
D. A. Barnum
Publications and source records attributed to D. A. Barnum.
Dietary ecology of breeding recurvirostrids in hypersaline environments
Abstract has not been submitted
Food-chain transfer of trace elements to wildlife
Explore the source record for details and available documents.
Use of agricultural drainwater impoundments by snowy plovers (Charadrius alexandrinus nivosus) in the southern San Joaquin valley, California
Explore the source record for details and available documents.
Characteristics of snowy plover (Charadrius alexandrinus) nest sites on agricultural drainwater evaporation ponds in the San Joaquin valley, California
Explore the source record for details and available documents.
Use of agricultural drainwater impoundments by snowy plovers in the southern San Joaquin Valley, California
No abstract available at this time
Preliminary analysis of impacts of agricultural drainage evaporation ponds on wintering waterfow
No abstract available at this time
Impacts of changing irrigation practices on waterfowl habitat use in the southern San Joaquin Valley, California
We used diurnal aerial census data to examine habitat use patterns of ducks wintering in the southern San Joaquin Valley, California from 1980-87. We calculated densities (birds/ha) for the northern pintail (Anas acuta), mallard (A. platyrhynchos), green-winged teal (A. crecca), cinnamon teal (A. cyanoptera), shoveler (A. clypeata), ruddy duck (Oxyura jamaicensis), and total ducks in each of 5 habitats. Densities of pintail and total ducks were greater in September than in other months. From October through January, density of teal and total ducks was greatest on Kern National Wildlife Refuge (NWR). Densities of ruddy duck and pintail were greatest on agricultural drainwater evaporation ponds and preirrigated cropland, respectively.
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.
Behavioral modification of reproduction in coyotes
No abstract available at this time