Most consumers' exposure to toxic methylmercury occurs when they eat fish. But research just published in the ACS journal Environmental Science & Technology could help clarify why methylmercury concentrations in tuna vary geographically.
The study is the first to track the timing of 12 geographically distinct breeding populations of tree swallows across the continent. Researchers measured how long birds spent at breeding grounds to raise their young, when they began migration and stopped to refuel, and when they arrived at wintering grounds. Understanding when birds move between breeding and wintering sites, and how different populations move, can help identify the greatest threats to survival.
Climate change causes an increase in the number of freshwaters that run dry, at least temporarily. Around 90,000 square kilometres of water surface have already vanished in the last 30 years. This trend is not only a threat to drinking water reserves and major ecosystems - dried freshwaters also play an important role in the global carbon cycle. Two recently published studies reveal that the importance of this phenomenon has so far been underrated.
Permafrost, is an element of the cryosphere which has not been as much studied as other soils like glaciers or marine ice. Now, for the first time, a review of the state of permafrost on Earth has been carried out thanks to the data analysis of more than 120 drillings distributed around the Arctic and the Antarctica, as well as in mountains and high plains worldwide.
Global warming is leaving more and more apparent scars in the world's permafrost regions. As the new global comparative study conducted by the international permafrost network GTN-P shows, in all regions with permafrost soils the temperature of the frozen ground at a depth of more than 10 meters rose by an average of 0.3 degrees Celsius between 2007 and 2016 -- in the Arctic and Antarctic, as well as the high mountain ranges of Europe and Central Asia.
The growth of forest trees all over the world is becoming more water-limited as the climate warms. The effect is most evident in northern climates and at high altitudes where the primary limitation on tree growth had been cold temperatures. The research, to be published in Science Advances this week, is the first time that changes in tree growth in response to current climate changes have been mapped at a near-global scale.
With the increased availability of remote sensing technologies, scientists now have access to high-resolution datasets on Earth's surface properties at the global scale. As a result, an international team of scientists, including ASU professor and hydrologist Enrique Vivoni of the School of Earth and Space Exploration, has published the first comprehensive high resolution map of Earth's floodplains in the Nature journal Scientific Data.
Researchers from Friedrich-Alexander-Universität Erlangen-Nürnberg have now investigated all glacial areas in South America in more detail than ever before, from the tropical areas to the subpolar regions. Their two major findings are that the highest rate of mass loss is in the Patagonian ice sheet, and that the glaciers in the tropics have lost considerably less mass than previously projected, although this is not the good news which it might appear at first sight.
A team of Nottingham scientists is using drones to survey woody climbing plants and better understand how they may affect the carbon balance of tropical rainforests.
Mega-dams should not be built in lowland tropical forest regions due to the threat they pose to biodiversity and ecosystems, according to experts at the University of Stirling.