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a blood survey of elements, viral antibodies, and hemoparasites in wintering harlequin ducks (histrionicus histrionicus) and barrow's goldeneyes (bucephala islandica).twenty-eight harlequin ducks (histrionicus histrionicus) and 26 barrow's goldeneyes (bucephala islandica) were captured in prince william sound, alaska, between 1 and 15 march 2005. blood was collected for quantification of element concentrations, prevalence of antibodies to several viruses, and hemoparasite prevalence and identification. although we found selenium concentrations that have been associated with selenosis in some birds (>or=2.0 ppm ww), our findings contribute to a growing literat ...200818436685
exposure of sea otters and harlequin ducks in prince william sound, alaska, usa, to shoreline oil residues 20 years after the exxon valdez oil spill.we assessed whether sea otters and harlequin ducks in an area of western prince william sound, alaska, usa (pws), oiled by the 1989 exxon valdez oil spill (evos), are exposed to polycyclic aromatic hydrocarbons (pah) from oil residues 20 years after the spill. spilled oil has persisted in pws for two decades as surface oil residues (sor) and subsurface oil residues (ssor) on the shore. the rare sor are located primarily on the upper shore as inert, nonhazardous asphaltic deposits, and ssor are c ...201121298711
harlequin duck population injury and recovery dynamics following the 1989 exxon valdez oil spill.the 1989 exxon valdez oil spill caused significant injury to wildlife populations in prince william sound, alaska, usa. harlequin ducks (histrionicus histrionicus) were particularly vulnerable to the spill and have been studied extensively since, leading to one of the most thorough considerations of the consequences of a major oil spill ever undertaken. we compiled demographic and survey data collected since the spill to evaluate the timing and extent of mortality using a population model. durin ...201021049885
cytochrome p4501a biomarker indication of oil exposure in harlequin ducks up to 20 years after the exxon valdez oil spill.hydrocarbon-inducible cytochrome p4501a (cyp1a) expression was measured, as ethoxyresorufin-o-deethylase (erod) activity, in livers of wintering harlequin ducks (histrionicus histrionicus) captured in areas of prince william sound, alaska, usa, oiled by the 1989 exxon valdez spill and in birds from nearby unoiled areas, during 2005 to 2009 (up to 20 years following the spill). the present work repeated studies conducted in 1998 that demonstrated that in harlequin ducks using areas that received ...201020821550
pcb exposure in sea otters and harlequin ducks in relation to history of contamination by the exxon valdez oil spill.exposure to contaminants other than petroleum hydrocarbons could confound interpretation of exxon valdez oil spill effects on biota at prince william sound, alaska. hence, we investigated polychlorinated biphenyls (pcbs) in blood of sea otters and harlequin ducks sampled during 1998. pcb concentrations characterized by lower chlorinated congeners were highest in sea otters from the unoiled area, whereas concentrations were similar among harlequin ducks from the oiled and unoiled area. blood enzy ...201020132952
polycyclic aromatic hydrocarbon exposure in steller's eiders (polysticta stelleri) and harlequin ducks (histronicus histronicus) in the eastern aleutian islands, alaska, usa.seaducks may be affected by harmful levels of polycyclic aromatic hydrocarbons (pahs) at seaports near the arctic. as an indicator of exposure to pahs, we measured hepatic enzyme 7-ethoxyresorufin-o-deethylase activity (erod) to determine cytochrome p4501a induction in steller's eiders (polysticta stelleri) and harlequin ducks (histronicus histronicus) from unalaska, popof, and unga islands (ak, usa) in 2002 and 2003. we measured pahs and organic contaminants in seaduck prey samples and polychlo ...200718020694
an evaluation of marine bird population trends following the exxon valdez oil spill, prince william sound, alaska.we examined post-spill trends (1989-1998) of marine bird populations in prince william sound (pws) following the exxon valdez oil spill (evos) to evaluate recovery of injured taxa. two criteria were employed. first, we examined population trends of injured taxa only in the oiled area of pws using regression models. second, we examined population trends of injured taxa in the oiled area relative to the unoiled area using homogeneity of the slopes tests. we considered a population recovering if th ...200111381751
chronic hydrocarbon exposure of harlequin ducks in areas affected by the selendang ayu oil spill at unalaska island, alaska.we evaluated chronic exposure of harlequin ducks (histrionicus histrionicus) to hydrocarbons associated with the 2004 m/v selendang ayu oil spill at unalaska island, alaska. we measured levels of hepatic 7-ethoxyresorufin-o-deethylase activity (erod) in liver biopsy samples as an indicator of hydrocarbon exposure in three oiled bays and one reference bay in 2005, 2006, and 2008. median erod activity in ducks from oiled bays was significantly higher than in the reference bay in seven of nine pair ...201222933448
geographic and temporal patterns of variation in total mercury concentrations in blood of harlequin ducks and blue mussels from alaska.we compared total mercury (hg) concentrations in whole blood of harlequin ducks (histrionicus histrionicus) sampled within and among two geographically distinct locations and across three years in southwest alaska. blue mussels were collected to assess correlation between hg concentrations in locally available forage and birds. mercury concentrations in harlequin duck blood were significantly higher at unalaska island (0.31±0.19 mean±sd, μg/g blood) than kodiak island (0.04±0.02 mean±sd, μg/g bl ...201728162252
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