Publications

organochlorine insecticide residues in ducklings and their dilution by growth.	residues of ddt, ddd, dde, and dieldrin in 7 species of ducklings from alberta, canada, were measured. levels of ddt and metabolites ranged from 0 to 36.48 ppm in fat of 96% of the birds and from 0 to 0.97 ppm im muscle from 67% of the birds. residue levels of dieldrin ranged from 0 to 2.62 ppm in fat and from 0 to 0.11 ppm in muscle of 43 and 19% of the birds, respectively. growth dilution was considered to be the most significant factor in reducing the insecticide residue levels in the ducklin ...	1976	963316
[structure and blood supply of the heart valves of several domestic and wild birds].	by means of a complex technique some structural and blood supply peculiarities of the valve apparatus have been studied in 118 hearts of 8 representatives of domestic (anser domesticus, anas domestica) and wild (cygnus olor, cygnus sygnus, chenopsis atrata, anser anser, anas platyrhynchos, anas strepera) waterfowls. the investigations have demonstrated that in all the waterfowl studied the right atrioventricular ostia have only one cusp consisting mainly of transversal-striated muscular fibers. ...	1978	718435
duck plague: a carrier state in waterfowl.	healthy waterfowl were found to be carriers of duck plague (dp) virus. black ducks (anas rubripes) and canada geese (branta canadensis) surviving a natural outbreak of dp at coloma, wisconsin, in 1973 yielded dp virus in cloacal swabs taken four years postinfection. experimental infection of previously unexposed mallard ducks (anas platyrhynochos) with the coloma strain of dp virus co-wi (73) also produced cloacal virus shedding for up to four years after infection. a second dp virus strain, la- ...	1979	232659
gastrointestinal helminths of the mexican duck, anas platyrhynchos diazi ridgway, from north central mexico and southwestern united states.	twenty-five species of helminths, recovered from the gastrointestinal tracts of 129 mexican ducks from mexico and the united states, were all new host records. the species included: echinoparyphium recurvatum, echinostoma revolutum, hypoderaeum conoideum, notocotylus attenuatus, prosthogonimus cuneatus, zygocotyle lunata, anomotaenia ciliata, cloacotaenia megalops, diorchis bulbodes, diorchis sp., drepanidotaenia lanceolata, echinocotyle rosseteri, fimbriaria fasciolaris, fimbriarioides sp., hym ...	1986	3951061
avian influenza viruses from migratory and resident ducks of coastal louisiana.	cloacal and tracheal swabs were collected from 1389 hunter-killed ducks in cameron parish, louisiana, during the 1986 and 1987 waterfowl seasons. twenty-eight avian influenza viruses (aivs) were isolated from 605 blue-winged teal (anas discors), 75 mottled ducks (a. fulvigula), 375 gadwalls (a. stepera) and 334 green-winged teal (a. crecca). prevalence estimates of aiv in ducks sampled during september, november, and december through january were 3.1%, 2.0%, and 0.4%, respectively. differences i ...	1990	2369380
avian paramyxoviruses from migrating and resident ducks in coastal louisiana.	cloacal and tracheal swabs were collected from 1,409 hunter-killed ducks in cameron parish, louisiana, during the 1986 and 1987 waterfowl seasons. thirty avian paramyxoviruses (pmv's) were isolated from 605 blue-winged teal (anas discors), 75 mottled ducks (a. fulvigula), 375 gadwalls (a. strepera), 334 green-winged teal (a. crecca), and 20 mallards (a. platyrhynchos). prevalence of pmv decreased (p = 0.042) from september (4%) through november (2%) to december and january (1%). juveniles had a ...	1991	2023311
avian influenza in wild waterfowl and shorebirds in the donana national park: serological survey using the enzyme-linked immunosorbent assay.	the indirect elisa was used to detect antibodies to influenzavirus a in the sera of wildfowl from the donana national park. of the 712 birds examined, 44 (6.2%) were seropositive. positive birds belonged to 10 of the 13 species studied. infection rates varied widely: spoonbill (platalea leucorodia, 32.2%), mallard (anas platyrhynchos, 9.9%), gadwall (anas strepera, 8.6%), red-crested pochard (netta rufina, 8.1%), pochard (aythya ferina, 6.4%), shoveler (anas clypeata, 5%), great crested grebe (p ...	1994	18671098
the occurrence of mycoplasmas in selected wild north american waterfowl.	we determined the prevalence of mycoplasma infection in breeding mallard (anas platyrhynchos) and canvasback (aythya valisineria) hens and their broods from the central united states (1988 to 1990); and wintering american black duck (anas rubripes) and mallard hens from the eastern united states (1990 to 1993). mycoplasmas were isolated by culturing tracheal swabs from 656 live birds and tissue samples from 112 dead waterfowl. nine (18%) of 51 mycoplasma isolates were identified as mycoplasma an ...	1995	8592358
virulence of six strains of duck plague virus in eight waterfowl species.	susceptibility of new world waterfowl to the lake andes strain of duck plague virus (dpv) was assessed by intramuscular inoculation of adult muscovies (cairina moschata), mallards (anas platyrhynchos), canada geese (branta canadensis), wood ducks (aix sponsa), redheads (aythya americana), gadwalls (anas strepera), blue-winged teal (anas discors), and pintails (anas acuta). the relative virulence of dpv strains isolated from five united states and one canadian location was established in muscovie ...	1996	8827671
[low genetic differentiation and close evolutionary connection between anas platyrhynchos and anas poecilorhyncha: data from rapd-pcr analysis].	using rapd-pcr, we examined genetic diversity and phylogenetic relationships in two groups of river ducks: anas platyrhynchos, a. poecilorhyncha, a. strepera and a. crecca, a. formosa, a. querquedula. molecular taxon-specific markers were found for teals (a. crecca, a. formosa, a. querquedula) and gadwall (a. strepera). each of the species examined was shown to exhibit high genetic diversity. the mean levels of intraspecific genetic polymorphism in the groups of mallards (p = 77%) and teals (p = ...	2003	14658340
organic pollutants in wild ducks from new york state: i. interspecies differences in concentrations and congener profiles of pcbs and pcdds/pcdfs.	wild ducks of three species, common mergansers (mergus merganser americanus), gadwalls (anas streptera), and mallards (anas platyrhynchos), were collected near industrial sites in the massena, ny area of the st. lawrence river (slr) in 1988/89 and 1994. additional samples were collected in 1994 near a former polychlorinated biphenyl (pcb) capacitor plant at fort edward, ny (a mallard and two wood ducks (aix sponsa)), and at control sites (common mergansers, mallards and wood ducks). on a lipid b ...	2006	16290188
nuclear loci and coalescent methods support ancient hybridization as cause of mitochondrial paraphyly between gadwall and falcated duck (anas spp.).	many species have mitochondrial dna lineages that are phylogenetically intermixed with other species, but studies have rarely tested the cause of such paraphyly. in this study, we tested two hypotheses that could explain mitochondrial paraphyly of holarctic gadwalls (anas strepera) with respect to asian falcated ducks (a. falcata). first, hybridization could have resulted in falcated duck mitochondrial dna (mtdna) introgressing into the gadwall gene pool. second, gadwalls and falcated ducks coul ...	2007	17683440
[complex environmental and virological monitoring in the primorye territory in 2003-2006].	the paper presents the results of monitoring of viruses of western nile (wn), japanese encephalitis (je), tick-borne encephalitis (tbe), geta, influenza a, as well as avian paramicroviruses type i (virus of newcastle disease (nd)) and type 6 (apmv-6) in the primorye territory in 2003-2006. totally throughout the period, specific antibodies to the viruses were detected by neutralization test in wild birds (7.3%, wn; 8.0%, geta; 0.7% batai; 2.8%, alpine hare (lepus timidus); by hemagglutination-in ...	2007	18041224
wild ducks as long-distance vectors of highly pathogenic avian influenza virus (h5n1).	wild birds have been implicated in the expansion of highly pathogenic avian influenza virus (h5n1) outbreaks across asia, the middle east, europe, and africa (in addition to traditional transmission by infected poultry, contaminated equipment, and people). such a role would require wild birds to excrete virus in the absence of debilitating disease. by experimentally infecting wild ducks, we found that tufted ducks, eurasian pochards, and mallards excreted significantly more virus than common tea ...	2008	18394278
taxonomic structure of digenea in wild ducks (anatinae) from west pomerania.	parasitic fauna of birds connected with water environment, including digeneans, is relatively well researched in poland. the exception, however, is west pomerania, where those birds were not frequent objects of parasitological research until recently. the purpose of this work is to determine the taxonomic structure of the digenea, parasitising wild ducks living in west pomerania. the research material was 124 individuals of wild anatinae (anseriformes) belonging to 8 species: anas strepera, a. c ...	2008	18702318
geographical gradients in the population dynamics of north american prairie ducks.	1. geographic gradients in population dynamics may occur because of spatial variation in resources that affect the deterministic components of the dynamics (i.e. carrying capacity, the specific growth rate at small densities or the strength of density regulation) or because of spatial variation in the effects of environmental stochasticity. to evaluate these, we used a hierarchical bayesian approach to estimate parameters characterizing deterministic components and stochastic influences on popul ...	2008	18631261
multilocus phylogeography of a holarctic duck: colonization of north america from eurasia by gadwall (anas strepera).	more than 100 species of birds have holarctic distributions extending across eurasia and north america, and many of them likely achieved these distributions by recently colonizing one continent from the other. mitochondrial dna (mtdna) and five nuclear introns were sequenced to test the direction and timing of colonization for a holarctic duck, the gadwall (anas strepera). three lines of evidence suggest gadwalls colonized north america from eurasia. first, new world (nw) gadwalls had fewer alle ...	2008	18346221
influenza a viruses in wild birds of the pacific flyway, 2005-2008.	avian influenza viruses (aivs) pose a significant threat to public health, and viral subtypes circulating in natural avian reservoirs can contribute to the emergence of pathogenic influenza viruses in humans. we investigated the prevalence and distribution of aivs in 8826 migratory and resident wild birds in north america along the pacific flyway, which is a major north-south migration pathway that overlaps with four other flyways in alaska providing opportunities for mixing of eurasian and amer ...	2010	20059316
heterogeneity in genetic diversity among non-coding loci fails to fit neutral coalescent models of population history.	inferring aspects of the population histories of species using coalescent analyses of non-coding nuclear dna has grown in popularity. these inferences, such as divergence, gene flow, and changes in population size, assume that genetic data reflect simple population histories and neutral evolutionary processes. however, violating model assumptions can result in a poor fit between empirical data and the models. we sampled 22 nuclear intron sequences from at least 19 different chromosomes (a genomi ...	2012	22384117
integrative taxonomy of central european parasitic flatworms of the family prosthogonimidae lühe, 1909 (trematoda: plagiorchiida).	species of the family prosthogonimidae are considered the most pathogenic poultry trematodes worldwide, affecting particularly low intensity farming in rural areas. adults of prosthogonimus occur mainly in the bursa of fabricius, oviduct and cloaca of ducks, geese, fowl and other birds feeding at least occasionally on dragonflies or damselflies (odonata). we analyzed the central european species of the prosthogonimidae, namely prosthogonimus cuneatus, prosthogonimus ovatus, prosthogonimus pelluc ...	2015	25724855
mercury concentration in the feathers of birds from various trophic levels in fereydunkenar international wetland (iran).	mercury (hg) is one of the main global pollutants that may biomagnify in food nets, especially in wetlands. birds may be useful in the biomonitoring of hg in such habitats and may even serve in vivo samples. this paper examined hg concentration in the feathers of seven bird species foraging on fereydunkenar international wetland (in 2013). mean hg concentrations found ranged from 0.005 ± 0.002 μg g(-1) d.w. (dry weight) (common hoopoe) to 0.38 ± 0.047 μg g(-1) d.w. (greylag goose). significant d ...	2016	27838877
winter waterbird community composition and use at created wetlands in west virginia, usa.	information on nonbreeding waterbirds using created wetlands in the central appalachian region of the united states is limited. we compared waterbird communities of two managed wetlands, created in 2013 and 2001, in west virginia. we observed 27 species of waterbirds. species richness and diversity were generally similar between the wetlands, but species composition and use differed. branta canadensis (canada geese), anas strepera (gadwall), bucephala albeola (buffleheads), aythya affinis (lesse ...	2017	28386513
detection of amphibian chytrid fungus on waterfowl integument in natural settings.	the chytrid fungus batrachochytrium dendrobatidis (bd), the causal agent of the amphibian disease chytridiomycosis, has spread at an alarming rate since its discovery. bd was initially thought to only infect keratinizing epithelial cells in amphibians, a core component of amphibian skin. however, recent studies have detected bd on the integument of non-amphibian hosts. we conducted a survey of 3 duck species (gadwalls, green-winged teals, and mallards) to determine whether bd dna could be found ...	2017	28930087
waterbird counts on large water bodies: comparing ground and aerial methods during different ice conditions.	the aerial and ground methods of counting birds in a coastal area during different ice conditions were compared. ice coverage of water was an important factor affecting the results of the two methods. when the water was ice-free, more birds were counted from the ground, whereas during ice conditions, higher numbers were obtained from the air. the first group of waterbirds with the smallest difference between the two methods (average 6%) contained seven species: mute swan cygnus olor, whooper swa ...	2018	30038859
metal concentrations in tissues of gadwall and common teal from miankaleh and gomishan international wetlands, iran.	miankaleh and gomishan international wetlands are important wintering areas for waterbirds in the caspian sea region. previous studies revealed increased exposure to metals in some species of waterbirds using these wetlands. in this study, we examined concentrations of cadmium (cd), chromium (cr), iron (fe), lead (pb), and zinc (zn) in kidneys, liver, and pectoral muscle of wintering gadwall (anas strepera) and common teal (anas crecca) collected in 2012. in addition, we measured concentrations ...	2018	29330823
trace elements in the feathers of waterfowl from nanhaizi wetland, baotou, china.	the trace element concentrations (cr, ni, pb, hg, cu, zn, mn, and fe) of feathers from ferruginous duck (aythya nyroca), gadwall (anas strepera), and green-winged teal (anas crecca) from nanhaizi wetland, china were measured. (1) there were significant differences in the concentrations of the cr, ni, and pb among the waterfowl species. the concentrations of cr and ni in gadwall feathers and pb in green-winged teal feathers were higher than the concentrations of cr, ni and pb in ferruginous duck. ...	2019	30918995
gps tracking data reveals daily spatio-temporal movement patterns of waterfowl.	spatio-temporal patterns of movement can characterize relationships between organisms and their surroundings, and address gaps in our understanding of species ecology, activity budgets, bioenergetics, and habitat resource management. highly mobile waterfowl, which can exploit resources over large spatial extents, are excellent models to understand relationships between movements and resource usage, landscape interactions and specific habitat needs.	2019	30834128
sitting ducklings: timing of hatch, nest departure, and predation risk for dabbling duck broods.	for ground-nesting waterfowl, the timing of egg hatch and duckling departure from the nest may be influenced by the risk of predation at the nest and en route to wetlands and constrained by the time required for ducklings to imprint on the hen and be physically able to leave the nest. we determined the timing of hatch, nest departure, and predation on dabbling duck broods using small video cameras placed at the nests of mallard (anas platyrhynchos; n = 26), gadwall (mareca strepera; n = 24), and ...	2019	31110697
petrology and geochemistry dataset of the precambrian granitoids from the part of gadwal schist belt, eastern dharwar craton india.	the data presented in this article related to the research article entitled "petrology and geochemistry of the precambrian granitoids from the part of gadwal schist belt, eastern dharwar craton india". the granitoids from the gadwal schist belt area of the telangana state are confined to precambrian gneissic complex part of eastern dharwar craton. the article described the petrology and whole rock geochemistry in the precambrian gneissic complex part of gadwall schist belt. the whole rock geoche ...	2019	31061852
timing, frequency, and duration of incubation recesses in dabbling ducks.	nest attendance is an important determinant of avian reproductive success, and identifying factors that influence the frequency and duration of incubation recesses furthers our understanding of how incubating birds balance their needs with those of their offspring. we characterized the frequency and timing (start time, end time, and duration) of incubation recesses for mallard (anas platyrhynchos) and gadwall (mareca strepera) hens breeding in suisun marsh, california, usa, and examined the infl ...	2020	32184998
gastrointestinal helminths of waterfowl (anatidae: anatinae) in the lerma marshes of central mexico: some pathological aspects.	gastrointestinal helminths of migratory waterfowl can cause several lesions that may affect the health and even the survival of their hosts. as part of an ongoing project that aims to inventory the helminth species that infect this group of birds, as well as the histopathologic lesion they cause, a total of 200 digestive tracts of nine species of anatid birds (spatula discors, s. cyanoptera, s. clypeata, mareca strepera, m. americana, anas crecca, a. acuta, a. platyrhynchos diazi, and oxyura jam ...	2020	32904306
wetland water-management may influence mercury bioaccumulation in songbirds and ducks at a mercury hotspot.	mercury is a persistent, biomagnifying contaminant that can cause negative behavioral, immunological, and reproductive effects in wildlife and human populations. we examined the role of wetland water-management on mercury bioaccumulation in songbirds and ducks at kellys slough national wildlife refuge complex, near grand forks, north dakota usa. we assessed mercury concentrations in blood of wetland-foraging songbirds (80 common yellowthroats [geothlypis trichas] and 14 nelson's sparrows [ammosp ...	2020	31902053