Contaminants in foods of aquatic birds at Kesterson Reservoir, California, 1985
R. L. Hothem, H. M. Ohlendorf
1989, Archives of Environmental Contamination and Toxicology (18) 773-786
Plants, aquatic insects, and mosquitofish (Gambusia affinis) were collected from Kesterson Reservoir, Merced County, California, and a nearby reference site (Volta Wildlife Area) to compare concentrations of three contaminants found in 1985 with those reported in 1983 and 1984. Mean selenium concentrations in food-chain organisms from sites at Kesterson in...
Breeding canvasbacks: a test of a habitat model
Douglas H. Johnson, M.C. Hammond, T. L. McDonald, C.L. Nustad
1989, Prairie Naturalist (21) 193-202
Schroeder (1984) proposed a habitat suitability model for breeding canvasbacks (Aythya valisineria) based on the size, water regime, and emergent vegetation of wetlands. We evaluated the model with data from surveys of canvasbacks on 2265 wetlands in North Dakota, South Dakota, and Minnesota. The model proved inadequate as a predictor...
Importance of individual species of predators on nesting success of ducks in the Canadian prairie pothole region
Douglas H. Johnson, Alan B. Sargeant, Raymond J. Greenwood
1989, Canadian Journal of Zoology (67) 291-297
We followed 3094 upland nests of several species of ducks. Clutches in most nests were lost to predation. We related daily nest predation rates to indices of activity of eight egg-eating predators, precipitation during the nesting season, and measures of wetland conditions. Activity indices of red fox (Vulpes vulpes), striped...
Carbonate deposition on tail feathers of ruddy ducks using evaporation ponds
N.H. Euliss Jr., R. L. Jarvis, D.S. Gilmer
1989, Condor (91) 803-806
Substantial carbonate deposits were observed on rectrices of Ruddy Ducks (Oxyura jamaicensis) collected during 1982-1984 on evaporation ponds in the San Joaquin Valley, California. Carbonate deposits were composed of about 75% aragonite and 25% calcite, both polymorphous forms of CaCO3. Significantly more carbonate deposits were observed on Ruddy Ducks as...
Atlantic salmon brood stock management and breeding handbook
Harold L. Kincaid, Jon G. Stanley
1989, Biological Report 89(12)
Anadromus runs of Atlantic salmon have been restored to the Connecticut, Merrimack, Pawcatuck, Penobscot, and St. Croix rivers in New England by the stocking of more than 8 million smolts since 1948. Fish-breeding methods have been developed that minimize inbreeding and domestication and enhance natural selection. Methods are...
Duck harvest on public hunting areas in California
D.S. Gilmer, J.M. Hicks, J. P. Fleskes, D.P. Connelly
1989, California Fish and Game (75) 155-168
We summarized hunter visits and success, and the magnitude and species composition of the duck harvest recorded on California public hunting areas (PHAs) during 1950-87. Hunter visits and harvest increased during 1950-74 as new PHAs were added, then declined concurrently with duck populations. Of six geographic regions, the Sacramento Valley,...
Rice available to waterfowl in harvested fields in the Sacramento Valley, California
M. R. Miller, D.E. Sharp, D.S. Gilmer, W.R. Mulvaney
1989, California Fish and Game (75) 113-123
The last watering holes on the prairie
Gary L. Krapu
1989, Natural History (1) 67-68
Abstract has not been submitted...
Wetland bird seasonal abundance and habitat use at Lake Earl and Lake Talawa, California
S.L. Funderburk, P. F. Springer
1989, California Fish and Game (75) 85-101
A study of wetland bird composition, seasonal abundance, and habitat use was conducted on Lake Earl and Lake Talawa in Del Norte County, California from July 1974 through February 1976. Ninety-five species were recorded. Most birds occurred from October to December and during March and April. Diving ducks occurred primarily...
Rice available to waterfowl in harvested fields in the Sacramento Valley, California
M. R. Miller, D.E. Sharp, D.S. Gilmer, W.R. Mulvaney
1989, California Fish and Game (75) 113-123
Rice fields in the Sacramento Valley, California were sampled in 1985 and 1986 to determine the weight of rice seed remaining in the fields immediately after harvest and again after the fields were burned. No significant differences were found between years (P>0.05). The pooled mean was 388 kg/ha in harvested...
Shed those feathers!
M. R. Miller
1989, California Waterfowl Association Magazine (15) 23
No abstract available at this time...
Accretion and canal impacts in a rapidly subsiding wetland II: Feldspar marker horizon technique
Donald R. Cahoon, R.E. Turner
1989, Estuaries (12) 260-268
Recent (6–12 month) marsh sediment accretion and accumulation rates were measured with feldspar marker horizons in the vicinity of natural waterways and man-made canals with spoil banks in the rapidly subsiding environment of coastal Louisiana. Annual accretion rates in aSpartina alterniflora salt marsh in the Mississippi deltaic plain averaged 6 mm...
Rising water levels and the future of southeastern Louisiana swamp forests
W.H. Conner, M. Brody
1989, Estuaries (12) 318-323
An important factor contributing to the deterioration of wetland forests in Louisiana is increasing water levels resulting from eustatic sea-level rise and subsidence. Analyses of long-term water level records from the Barataria and Verret watersheds in southeastern Louisiana indicate an apparent sea level rise of about 1-m per century, mainly...
Presumed drowning of Aleutian Canada geese on the Pacific coast of California and Oregon
Paul F. Springer, Roy W. Lowe, Richard K. Stroud, Patricia A. Gullett
1989, Journal of Wildlife Diseases (25) 276-279
Carcasses of 42 and 17 Aleutian Canada geese (Branta canadensis leucopareia), a federally listed endangered species, were found on ocean beaches near Crescent City, California, and near Pacific City, Oregon, respectively, following severe storms. Necropsies and other information suggest that the birds were flushed during the storms and somehow entered...
Prairie basin wetlands of the Dakotas: a community profile
H.A. Kantrud, Gary L. Krapu, G.A. Swanson
1989, Biological Report 85(7.28)
This description of prairie basin wetlands of the Dakotas is part of a series of community profiles on ecologically important wetlands of national significance. The shallow wetlands of the Dakotas form the bulk of the portion of the Prairie Pothole Region lying within the United States. This region is famous...
Sublethal effects of phenanthrene, nicotine, and pinane on Daphnia pulex
Jacqueline F. Savino, Lila L. Tanabe
1989, Bulletin of Environmental Contamination and Toxicology (42) 778-784
Chronic studies of Daphnia Pulex exposed to different concentrations of phenanthrene, nicotine, and pinane produced consistent sublethal effects among replicates and concentrations. The LOEC's for growth and fecundity with each chemical tested were 3 to 30% of the 48-hr EC50's. Growth decreased as concentration increased for each chemical tested, and...
Seasonal reproductive development of Lampsilis cardium, Amblema plicata plicata, and Potamilus alatus
L. E. Holland Bartels, T. W. Kammer
1989, Journal of Freshwater Ecology (5) 87-92
Adult specimens of three species of freshwater mussels common to the upper Mississippi River were examined histologically to determine seasonal patterns of development in gametogenesis and release of glochidia. Full maturation of gonadal materials in Lampsilis cardium (formerly L. ovata ventricosa), a long-term breeder, occurred when ambient river temperatures...
Assessment of lake trout spawning habitat quality in central Lake Huron by submarine
Bruce A. Manny, Thomas A. Edsall
1989, Journal of Great Lakes Research (15) 164-173
Interstitial water quality was measured using a submersible at seven locations on Six Fathom Bank. Historically, the bank was an important lake trout spawning ground. It is currently the focus of coordinated, interagency efforts to rehabilitate lake trout in Lake Huron. Water quality, evaluated from measurements of...
Reversed-phase thin-layer chromatography of homologs of Antimycin-A and related derivatives
Sharon L. Abidi
1989, Journal of Chromatography (464) 453-458
Using a reversed-phase high-performance liquid chromatographic (HPLC) technique, a mixture of antimycins A was separated into eight hitherto unreported subcomponents, Ala, Alb, A2a, A2b, A3a, A3b, A4a, and A4b. Although a base-line resolution of the known four major antimycins Al, A2, A3, and A4 was readily achieved with mobile phases...
Organochlorine contaminants in white-faced ibis eggs in southern Texas
T. W. Custer, C. A. Mitchell
1989, Colonial Waterbirds (12) 126-129
White-faced Ibis (Plegadis chihi) eggs collected from two colonies in southern Texas in 1985 had low mean concentrations of DDE (0.14-0.27 ppm wet weight). DDD, the only other organochlorine contaminant detected, was found in only 1 of 20 eggs. DDE concentrations in eggs were not significantly correlated with eggshell thickness....
A macrophyte submodel for aquatic ecosystems
Carol Desormeau Collins, Joseph H. Wlosinski
1989, Aquatic Botany (33) 191-206
A macrophyte submodel has been incorporated and tested in CE-QUAL-R1, a one-dimensional, vertically averaged model of reservoir water quality. A quasi two-dimensional scheme was necessary to represent the spatial relationship of macrophytes in reservoirs adequately. The macrophyte processes modeled were photosynthesis, dark respiration, excretion and nonpredatory mortality. Process equations for...
Metabolism of pentachlorophenol by fish
G. R. Stehly, W. L. Hayton
1989, Xenobiotica (19) 75-81
Interspecies variability in the metabolism of pentachlorophenol (PCP) was investigated by exposing rainbow trout, fathead minnows, sheepshead minnow, firemouth, and goldfish to water-borne super(14)C-PCP for 64 h. The amounts of metabolites in bile and exposure water were species-dependent; all of the metabolites excreted into the water...
Disposition of pentachlorophenol in rainbow trout (Salmo gairdneri): Effect of inhibition of metabolism
G. R. Stehly, W. L. Hayton
1989, Aquatic Toxicology (14) 131-148
The accumulation kinetics of pentachlorophenol (PCP) were investigated in rainbow trout (Salmo gairdneri) in the absence and presence of 25 mg/1 salicylamide, an inhibitor of PCP metabolism. After exposure to 5 μg/1 PCP over 1–96 h, the amount of PCP in the whole fish, its concentration in water and the...
Effect of rearing density on poststocking survival of lake trout in Lake Ontario
Joseph H. Elrod, David E. Ostergaard, Clifford P. Schneider
1989, Progressive Fish-Culturist (51) 189-193
Six paired lots of yearling lake trout (Salvelinus namaycush) reared at densities of 41,000 and 51,000 fish per raceway during their last 9 months in the hatchery were stocked in Lake Ontario. Poststocking survival of the high-density (HD) and low-density (LD) fish was not different for the 1982 year-class. However,...
Distribution of alewives in southeastern Lake Ontario in autumn and winter: a clue to winter mortalities
Roger A. Bergstedt, Robert O’Gorman
1989, Transactions of the American Fisheries Society (118) 687-692
Alewives Alosa pseudoharengus in the Great Lakes are thought to avoid extreme cold in winter by moving to deep water where the temperature is usually highest because of inverse thermal stratification. Information collected in Lake Ontario during autumn and winter 1981–1984 with an echo sounder and bottom and midwater trawls indicated that...
