Publications

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high seroprevalence of antibodies to avian influenza viruses among wild waterfowl in alaska: implications for surveillance.we examined seroprevalence (presence of detectable antibodies in serum) for avian influenza viruses (aiv) among 4,485 birds, from 11 species of wild waterfowl in alaska (1998-2010), sampled during breeding/molting periods. seroprevalence varied among species (highest in eiders (somateria and polysticta species), and emperor geese (chen canagica)), ages (adults higher than juveniles), across geographic locations (highest in the arctic and alaska peninsula) and among years in tundra swans (cygnus ...201323472177
role of selenium toxicity and oxidative stress in aquatic birds.adverse effects of selenium (se) in wild aquatic birds have been documented as a consequence of pollution of the aquatic environment by subsurface agricultural drainwater and other sources. these effects include mortality, impaired reproduction with teratogenesis, reduced growth, histopathological lesions and alterations in hepatic glutathione metabolism. a review is provided, relating adverse biological effects of se in aquatic birds to altered glutathione metabolism and oxidative stress. labor ...200211879935
evidence that life history characteristics of wild birds influence infection and exposure to influenza a viruses.we report on life history characteristics, temporal, and age-related effects influencing the frequency of occurrence of avian influenza (ai) viruses in four species of migratory geese breeding on the yukon-kuskokwim delta, alaska. emperor geese (chen canagica), cackling geese (branta hutchinsii), greater white-fronted geese (anser albifrons), and black brant (branta bernicla), were all tested for active infection of ai viruses upon arrival in early may, during nesting in june, and while molting ...201323469210
blood selenium concentrations and enzyme activities related to glutathione metabolism in wild emperor geese.in 1998, we collected blood samples from 63 emperor geese (chen canagica) on their breeding grounds on the yukon-kuskokwim delta (ykd) in western alaska, usa. we studied the relationship between selenium concentrations in whole blood and the activities of glutathione peroxidase and glutathione reductase in plasma. experimental studies have shown that plasma activities of these enzymes are useful biomarkers of selenium-induced oxidative stress, but little information is available on their relatio ...200212371495
studies on the helminth fauna of alaska. vi. the parasites of the emperor goose (philacte canagica l.) with the description of hymenolepis philactes, n. sp. 195114841569
paramonostomum malerischi n. sp. (trematoda: digenea: notocotylidae) from the emperor goose (philacte canagica l.) in alaska. 195713476312
dispersal of h9n2 influenza a viruses between east asia and north america by wild birds.samples were collected from wild birds in western alaska to assess dispersal of influenza a viruses between east asia and north america. two isolates shared nearly identical nucleotide identity at eight genomic segments with h9n2 viruses isolated from china and south korea providing evidence for intercontinental dispersal by migratory birds.201525827532
plasma biochemistry values in emperor geese (chen canagica) in alaska: comparisons among age, sex, incubation, and molt.reduced populations of emperor geese (chen canagica), a bering sea endemic, provided the need to assess plasma biochemistry values as indicators of population health. a precursory step to such an investigation was to evaluate patterns of variability in plasma biochemistry values among age, sex, and reproductive period. plasma from 63 emperor geese was collected on their breeding grounds on the yukon-kuskokwim delta in western alaska, usa. the geese sampled included 18 incubating adult females ca ...200919569480
influenza a virus recovery, diversity, and intercontinental exchange: a multi-year assessment of wild bird sampling at izembek national wildlife refuge, alaska.western alaska is a potential point-of-entry for foreign-origin influenza a viruses (iavs) into north america via migratory birds. we sampled waterfowl and gulls for iavs at izembek national wildlife refuge (nwr) in western alaska, usa, during late summer and autumn months of 2011-2015, to evaluate the abundance and diversity of viruses at this site. we collected 4842 samples across five years from 25 species of wild birds resulting in the recovery, isolation, and sequencing of 172 iavs. with th ...201829621333
emperor geese (anser canagicus) are exposed to a diversity of influenza a viruses, are infected during the non-breeding period and contribute to intercontinental viral dispersal.emperor geese (anser canagicus) are endemic to coastal areas within beringia and have previously been found to have antibodies to or to be infected with influenza a viruses (iavs) in alaska. in this study, we use virological, serological and tracking data to further elucidate the role of emperor geese in the ecology of iavs in beringia during the non-breeding period. specifically, we assess evidence for: (a) active iav infection during spring staging, autumn staging and wintering periods; (b) in ...201931077545
coding-complete genome sequence of avian orthoavulavirus 16, isolated from emperor goose (anser canagicus) feces, alaska, usa.we sequenced the coding-complete genome of an avian orthoavulavirus serotype 16 (aoav-16) isolate recovered from emperor goose (anser canagicus) feces collected in alaska. the detection of aoav-16 in north america and genomic sequencing of the resultant isolate confirms that the geographic distribution of this virus extends beyond asia.202133414353
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