non-lethal sampling of avian indicators reveals reliable geographic signals of mercury despite highly dynamic patterns of exposure in a large wetland.mercury is a global contaminant with special relevance for aquatic food webs, where biomagnification can result in strong effects on apex predators. non-lethal sampling of tissues such as blood and feathers is often used to assess mercury risk and spatiotemporal variability of mercury exposure on avian populations. however, the assumption that samples from individuals within a population are representative of local mercury exposure underpins those approaches. while this assumption may be justifi ...201930708320
mercury concentration in nestling feathers better predicts individual reproductive success than egg or nestling blood in a piscivorous bird.piscivorous birds are at high risk of mercury exposure in aquatic food webs, and their reproductive success is sensitive to methylmercury exposure. although effects are convincingly shown in a handful of lab studies, sublethal effects at environmentally relevant concentrations in the field, where there is a range of other natural stressors, are not well delineated. part of that uncertainty arises because mercury concentration (hereafter, [hg]) in adult tissues used to assess hg risk can be influ ...201930626179
hematological indices of injury to lightly oiled birds from the deepwater horizon oil spill.avian mortality events are common following large-scale oil spills. however, the sublethal effects of oil on birds exposed to light external oiling are not clearly understood. we found that american oystercatchers (area of potential impact n = 42, reference n = 21), black skimmers (area of potential impact n = 121, reference n = 88), brown pelicans (area of potential impact n = 91, reference n = 48), and great egrets (area of potential impact n = 57, reference n = 47) captured between 20 june 20 ...201829024020
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