Mercury in breeding saltmarsh sparrows (Ammodramus caudacutus caudacutus)

  title={Mercury in breeding saltmarsh sparrows (Ammodramus caudacutus caudacutus)},
  author={Oksana P. Lane and Kathleen M. O’Brien and David C. Evers and Thomas P. Hodgman and Andrew Major and Nancy Pau and Mark J. Ducey and Robert J. Taylor and Deborah Perry},
Environmental mercury exposure of birds through atmospheric deposition and watershed point-source contamination is an issue of increasing concern globally. The saltmarsh sparrow (Ammodramus caudacutus) is of high conservation concern throughout its range and the potential threat of mercury exposure adds to other anthropogenic stressors, including sea level rise. To assess methylmercury exposure we sampled blood of the northern nominal subspecies of saltmarsh sparrows (A. c. caudacutus) nesting… 
Geographic variation of mercury in breeding tidal marsh sparrows of the northeastern United States
The results suggest considerable, unexplained variation in tidal marsh sparrow blood mercury (THg) concentrations over their co-occurring breeding ranges, and model averaging from a suite of linear mixed models showed that saltmarsh sparrows averaged 20.1% higher blood THg concentrations than seasideSparrows, potentially due to differences in diet or foraging behavior.
Characterization of Mercury and Its Risk in Nelson’s, Saltmarsh, and Seaside Sparrows
Evidence for net annual bioaccumulation is reported, indicating an increased risk in older individuals, and this study indicates that current Hg exposure places a considerable proportion of each population at risk.
Mercury in non-breeding sparrows of North Carolina salt marshes
The data provide a baseline for future Hg assessments in Nelson’s, Saltmarsh and Seaside Sparrows and indicate that Hg exposure on breeding sites may be increasing and that high levels of HG exposure during the breeding season may affect blood Hg concentrations year-round in Saltm Marsh Sparrows.
Mercury exposure of tidal marsh songbirds in the northeastern United States and its association with nest survival
Hg has the potential to impair songbird reproduction, potentially exacerbating known climate-change driven population declines from sea-level rise in saltmarsh and Acadian Nelson’s sparrows.
Mercury in Nelson's Sparrow Subspecies at Breeding Sites
Mercury was characterized in Nelson's Sparrows near Grand Forks, indicating that this area may represent a biological mercury hotspot and warrants further research to determine if wildlife populations of conservation or recreational interest in this area might be experiencing negative effects due to mercury exposure.
Songbirds as sentinels of mercury in terrestrial habitats of eastern North America
The results present the most comprehensive assessment of blood Hg concentrations in eastern songbirds to date, and thereby provide a valuable framework for designing and evaluating risk assessment schemes using sentinel songbird species in the time after implementation of the new atmospheric Hg standards.
Long-term monitoring of mercury in adult saltmarsh sparrows breeding in Maine, Massachusetts and New York, USA 2000–2017
It is found that mercury exposure differed by site and year but there was no consistent temporal trend across sites, and seasonal variation in blood mercury concentrations and a positive relationship between mercury concentrations of blood and innermost primary feather, but not between blood and tail feather.
Mercury Exposure Affects the Reproductive Success of a Free-Living Terrestrial Songbird, the Carolina Wren (Thryothorus ludovicianus)
This is the first field study to document the effect of specific adult songbird blood mercury concentrations on breeding performance; the results show that free-living songbirds can suffer negative reproductive effects at relatively low mercury concentrations.


Effects of mercury exposure on the reproductive success of tree swallows (Tachycineta bicolor)
An experimental tree swallow population was established in the headwaters of the Shenandoah River, Virginia, USA to assess the accumulation and effects of mercury contamination on birds that eat
Mercury Concentrations in Bicknell’s Thrush and Other Insectivorous Passerines in Montane Forests of Northeastern North America
The finding of a correlation between regional litterfall Hg flux patterns and Bicknell’s thrush blood Hg concentrations demonstrates on-site availability of MeHg, and is recommended to assess risk to insectivorous passerines, particularly the Bicarus bicknelli.
Mercury exposure and survival in free-living tree swallows (Tachycineta bicolor)
A small difference in survival between mercury-contaminated and reference sites is unlikely to impact population viability in this short-lived species; however, some songbirds accumulate mercury to a greater degree than tree swallows and do not possess the migratory behavior that removes swallows to less contaminated areas for the majority of the year.
Mercury in Sharp-Tailed Sparrows Breeding in Coastal Wetlands
Current levels of anthropogenic mercury (Hg) in the environment can cause harm to humans and wildlife. Well-documented negative effects on birds are described, but there is presently limited
Mercury in breeding and wintering Nelson’s Sparrows (Ammodramus nelsoni)
Blood, breast feathers and the first primary feather were sampled from Nelson’s Sparrows wintering in North Carolina coastal salt marshes and breeding in wetland systems in North Dakota and Ontario, Canada to provide significant insight on the timing of molt in this species and how Hg exposure varies regionally and seasonally.
Mercury concentrations in tidal marsh sparrows and their use as bioindicators in Delaware Bay, USA
It is proposed that Seaside Sparrows may be used as a tidal marsh Hg bioindicator species given their habitat specificity, relative abundance, widespread distribution in marsh habitats, ease of sampling, and limited variation in blood Hg estimates within a sampling area.
The role of weather in mediating the effect of mercury exposure on reproductive success in tree swallows
The results of this study provide insight into mechanisms underlying reproductive effects of mercury, and underscore the importance of considering variable environmental conditions when assessing effects of contaminants on free-living wildlife.
Mercury Exposure and Effects on Cavity-Nesting Birds from the Carson River, Nevada
Mercury (Hg) concentrations were 15–40 times higher in the eggs and livers of tree swallows and house wrens that nested along the Carson River at and below Dayton, Nevada than in the same species above the mining-impacted areas.
Reproduction and environmental contamination in tree swallows nesting in the Fox River drainage and Green Bay, Wisconsin, USA
Concentration, accumulation, and effects of polychlorinated biphenyls (PCBs) o nreproduction in tree swallows (Tachycineta bicolor) were studied at four sites in the Fox River drainage and in Green
Chlorinated hydrocarbons and mercury in sediments, red-winged blackbirds (Agelaius phoeniceus) and tree swallows (Tachycineta bicolor) from wetlands in the Great Lakes-St. Lawrence River basin
In 1991, we collected red-winged blackbird (Agelaius phoeniceus) eggs and tree swallow (Tachycineta bicolor) eggs and nestlings, and sediment samples from 12 wetland sites in the Great Lakes and St.