flow cytometric dna analysis of ducks accumulating 137cs on a reactor reservoir.the objective of this study was to detect red blood cell (rbc) dna abnormalities in male, game-farm mallard ducks as they ranged freely and accumulated 137cs (radiocesium) from an abandoned nuclear reactor cooling reservoir. prior to release, the ducks were tamed to enable recapture at will. flow cytometric measurements conducted at intervals during the first year of exposure yielded cell cycle percentages of dna (g0/g1, s, g2 + m phases) of rbc, as well as coefficients of variation (cv) in the ...19911868790
the effects of heptachlor and lindane on birds, columbia basin, oregon and washington, 1976-1981.the effects of heptachlor seed treatments on birds in the vicinity of the umatilla national wildlife refuge, oregon and washington, were investigated from 1978 to 1981. an egg was collected from each of 60 nests representing six species. heptachlor epoxide (he) residues were detected in 35 eggs and were particularly high (8-13 micrograms g-1) in a few eggs of the black-billed magpie, mallard, and ring-necked pheasant. these residues were within the range that induced reproductive problems in oth ...19852417314
pasteurella anatipestifer as a cause of mortality in semiwild pen-raised mallard ducks in south carolina. 19734766569
evidence of exposure of waterfowl and other aquatic birds to the hemagglutinating duck adenovirus identical to eds-76 virus.serum and fecal samples from 12 species of aquatic birds were studied for evidence of exposure to a hemagglutinating duck adenovirus (dav). dav is serologically indistinguishable from egg-drop syndrome-76 virus. a total of 285 serum samples were tested by the hemagglutination-inhibition (hi) test. forty-two percent of the birds had hi antibodies, with titers ranging from 8 to 256. wild ducks showed the highest frequency of antibodies (56%) while in coots and grebes, antibody was less frequent, 3 ...19846325725
haemoproteus greineri in wood ducks from the atlantic flyway.thin smears of blood were examined from 157 wood ducks (aix sponsa) trapped at savannah national wildlife refuge (south carolina, usa) and harris neck national wildlife refuge (georgia, usa) during spring and summer, 1994 and 1995. thirteen wood ducks (8%) were infected with blood parasites. eleven of these birds were infected with haemoproteus nettionis, seven with leucocytozoon simondi, and five with unidentified microfilariae. additionally, eight wood ducks (5%) were infected with haemoproteu ...19979131576
mercury patterns in wood duck eggs from a contaminated reservoir in south carolina, usa.mercury contamination of wildlife populations has been documented widely in recent years as biomonitoring has become an important tool for assessing environmental contamination. avian eggs provide an ideal assay material for hg biomonitoring, particularly when the collection of eggs is simplified by using cavity-nesting species that nest in easily monitored nest boxes. however, studies are needed that address the dynamics of how hg is distributed within eggs, and how hg is deposited naturally wi ...200516050598
Embryonic developmental patterns and energy expenditure are affected by incubation temperature in wood ducks (Aix sponsa).Recent research in birds has demonstrated that incubation temperature influences a suite of traits important for hatchling development and survival. We explored a possible mechanism for the effects on hatchling quality by determining whether incubation temperature influences embryonic energy expenditure of wood ducks (Aix sponsa). Because avian embryos are ectothermic, we hypothesized that eggs incubated at higher temperatures would have greater energy expenditure at any given day of incubation. ...201121897082
survey for west nile virus antibodies in wild ducks, 2004-06, usa.detection of west nile virus (wnv) in ducks has been reported in north america in isolated cases of mortality in wild waterbirds and following outbreaks in farmed ducks. although the virus has been noted as an apparent incidental finding in several species of ducks, little is known about the prevalence of exposure or the outcome of infection with wnv in wild ducks in north america. from 2004-06, we collected sera from 1,406 wild-caught american wigeon ( anas americana ), mallard ( anas platyrhyn ...201626981693
a generalizable energetics-based model of avian migration to facilitate continental-scale waterbird conservation.conserving migratory birds is made especially difficult because of movement among spatially disparate locations across the annual cycle. in light of challenges presented by the scale and ecology of migratory birds, successful conservation requires integrating objectives, management, and monitoring across scales, from local management units to ecoregional and flyway administrative boundaries. we present an integrated approach using a spatially explicit energetic-based mechanistic bird migration m ...201627509754
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