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Status of natural and human environment
This report present the results of the 2017 AMAP Assessment of Adaptation Actions for a changing Arctic (AACA): Perspectives form the Bering-Chukchi-Beaufort Region. This is one of three pilot study regions included in the AACA project. AACA is the first AMAP assessment dealing with adaptation actions and how to meet possible Arctic futures in these times of rapid chance. Information contained in this report is fully referenced and based first and foremost on peer-reviewed and published results of research and monitoring undertaken within the past decade. Care has been taken to ensure that no critical probability statements are based on non-peer-reviewed materials Access to reliable and up-to-date information is essential for the development of science-based decision-making regarding ongoing changes in the Arctic and their global implications.
Bacterial respiration of arsenate and its significance in the environment
No abstract available.
Biogeochemical transformations of selenium in anoxic environments
No abstract available.
Responsibilities and activities of the U.S. Geological Survey related to mining and the environment
No abstract available.
Introduction: Contaminants of emerging concern in the environment
No abstract available.
Contaminants of emerging concern in the environment: Where we have been and what does the future hold?
In 1962, Rachel Carson’s book Silent Spring alerted the nation to the dangers of manmade chemicals and indiscriminate use of pesticides. DDT was the culprit and its use threatened a variety of wildlife, including the national bird, bald eagles. In 1969, pressured by scientists and the public, the United States banned almost all uses of DDT; however, DDT was just the tip of the chemical iceberg. In 1996, Theo Colborn’s book, Our Stolen Future, again alerted the public to the dangers of chemical exposure. Endocrine-disrupting chemicals were identified as concerns because exposure to extremely small concentrations can have adverse effects on people and wildlife by interfering with chemical messaging systems, affecting things like sexual development and reproduction.
Manganese-iron accumulations in the shallow marine environment
No abstract available.
Distribution of niclosamide following granular Bayer applications in lentic environments
Temporal and spatial distribution of niclosamide in the water column and sediment were evaluated after the application of granular Bayluscide in six lentic sea lamprey ( Petromyzon marinus ) larval assessment plots. Water and sediment were collected 0.25, 1, 3, 5, and 7 hours after application and were analyzed for niclosamide, the active ingredient in granular Bayluscide. Water samples were collected from five heights in the water column (1 cm, 13 cm, 26 cm, 1/2 water column, and water surface) at five locations inside and four locations 10 m outside of each assessment plot. Sediment was collected from 18 locations within each plot. Niclosamide water concentrations inside and outside of the plots did not vary by depth but did vary between plots and by time. Niclosamide water concentrations also varied by sampler location outside of the plots. Following granular Bayluscide applications the mean niclosamide concentration in water for all levels, within the plots, decreased from 0.12 mgL -1 (SD = 0.12 mgL -1 ) at 15 minutes to 0.061 mgL -1 (SD = 0.040 mgL -1 ) at hour 1. The mean niclosamide concentration in the top 4 cm of sediment was 2.9 mgkg -1 (SD = 2.4 mgkg -1 ) 15 minutes after application and was 1.3 mgkg -1 (SD = 1.8 mgkg -1 ) at hour 7. Concentrations in all sediment samples ranged from < 0.001 to 30.730 mgkg -1 and varied between the six plots. Niclosamide concentrations measured in sediment samples were more than 1 order of magnitude greater than in the water and varied spatially by over 4 orders of magnitude.
Mars orbiter for resources, ices, and environments (MORIE)
The MORIE mission concept study examined the science and technical trade space to address high priority questions related to ice reservoirs and environmental transitions. The study team converged on a medium-class SEP-enabled orbiter with seven instruments to unlock the extent and volume of subsurface ice and geologic sequence stratigraphy through time. Observations would include the first radar imaging from orbit, the first radar sounding directly over the poles, and surface mineral mapping at unprecedented spatial scales.