New research will help islands prepare for future coastal hazards
Sometime before Columbus sailed into the Caribbean, a massive ocean upheaval tossed giant coral boulders far inland on tiny island — a sign that there may have a tsunami, or perhaps an extra-powerful hurricane in the region.
The new findings, published in the journal Geosphere, will help coastal planners prepare for unexpected hazards, according to researchers with the U.S. Geological Survey. The boulders were found in the British Virgin Islands at Anegada—a low-lying island named by Columbus in 1493 and located behind a coral reef that faces the Puerto Rico Trench. Continue reading “Mega-waves swept Caribbean corals far inland”→
Well density seen as key factor in decline of birds in Wyoming
Limiting the density of new oil and gas drilling rigs in Wyoming may not be enough to stem the decline of greater sage-grouse, according to scientists tracking populations of the imperiled bird.
Berween 1984 and 2008, populations declined by 2.5 percent annually, and the drop is clearly linked with oil and gas development, the new study from the USGS and Colorado State University found. The researchers used annual counts of males at breeding sites for their estimates, comparing those tallies to the the density of oil and gas wells and the area of disturbance associated with these wells. Continue reading “Sage grouse and drilling just don’t mix”→
‘Without them, groundwater resources become depleted’
Extreme precipitation events that cause severe flooding, loss of life and property damage aren’t exactly at the top of the weather wish list for most people. But it turns out they play a key role in replenishing underground aquifers in the western U.S.
The importance of groundwater will continue to grow in the years ahead — an era of population growth and climate disruption, so understanding the connection between big storms and groundwater recharge is critical, according to U.S. Geological Survey and Bureau of Reclamation scientists who have released a new study analyzing large, multi-year, quasi-decadal groundwater recharge events in the northern Utah portion of the Great Basin from 1960 to 2013.
Alaska makes up about 18 percent of the total U.S. land area but accounts for about 35 percent of the total carbon stock. The future of that carbon has big implications for global climate. If it’s released quickly, it could drive up global temperatures more than expected. And the carbon stored in high latitude ecosystems is considered to be vulnerable to climate change because of global warming. Continue reading “Climate: USGS measures Alaska land carbon stock”→
And for now, there is no smoking gun pointing to a single reason for the decline. That means there’s no easy answer, either, the scientists said, explaining that, across the U.S. there are multiple and geographically diverse factors that play role.
The research focused on native bees because there is limited information on their exposure to pesticides. In fact, little is known about how toxic these pesticides are to native bee species at the levels detected in the environment.
“We found that the presence and proximity of nearby agricultural fields was an important factor resulting in the exposure of native bees to pesticides,” said USGS scientist Michelle Hladik, the report’s lead author. “Pesticides were detected in the bees caught in grasslands with no known direct pesticide applications.” Continue reading “Neonicotinoid pesticide impacts extend to wild bees”→
Alaska study helps quantify climate impacts of melting permafrost
Much of the carbon stored in ancient Alaska soils could be released to the atmosphere shortly upon melting, according to a new study that aimed to help quantify how fast permafrost decomposes and how much carbon dioxide is produced in the process.