Because of the very low nitrate levels found in arctic tundra soil, scientists had assumed that plants in this biome do not use nitrate. But a new study co-authored by four Marine Biological Laboratory (MBL) Ecosystems Center scientists challenges this notion. The study has important implications for predicting which arctic plant species will dominate as the climate warms, as well as how much carbon tundra ecosystems can store.
Tropical Cyclone Marcus continues to parallel Western Australia and remain far from the coast, while weakening. NASA's Aqua satellite analyzed the storm in infrared light and saw a comma-shaped Marcus.
NASA satellite imagery showed that Tropical Cyclone Nora developed an eye as it strengthened into a hurricane north of Australia. NASA-NOAA's Suomi NPP satellite provided forecasters with a visible image of the storm, formerly named Tropical Cyclone 16P.
Climate change and other environmental factors are more threatening to fish diversity than predators, according to new research from the University of Guelph. It is a surprising and important finding, as humans rely upon freshwater lakes for more than one-fifth of their protein needs worldwide, says lead author Prof. Andrew MacDougall in U of G's Department of Integrative Biology.
Researchers of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, have obtained new chronological data for the timing of the Elsterian and Saalian glacial cycles in central Germany. They found that the first Quaternary glaciation, which covered huge parts of Europe in ice, occurred as early as 450,000 years ago and not - as previously thought - around 350,000 years ago. The researcher further showed that once these glaciers had retreated, the first people appeared in central Germany around 400,000 years ago.
After three years of work by more than 550 leading experts from over 100 countries, the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) today published assessments of biodiversity and ecosystem services worldwide (except the poles and open oceans), divided into four major regions. IPBES, with 129 State Members, says biodiversity continues to decline in every region of the world, endangering economies, livelihoods, food security and the quality of life of people everywhere.
Soil salinity poses a major threat to food security, greatly reducing the yield of agricultural crops. Rising global temperatures are expected to accelerate the buildup of salt in soil, placing an increasing burden on agricultural production. In a new study published in The Plant Cell, a team of researchers identified a gene that limits yield losses in rice plants exposed to salt stress and deciphered the underlying mechanism.
Exposures of pregnant women and children to common thyroid-hormone-disrupting toxins may be linked to the increased incidence of brain development disorders, according to a review published in Endocrine Connections. The review describes how numerous, common chemicals can interfere with normal thyroid hormone actions, which are essential for normal brain development in fetuses and young children, and suggests a need for greater public health intervention.
While a Category 4 hurricane on the Saffir-Simpson hurricane wind scale, NASA-NOAA's Suomi NPP satellite passed over Tropical Cyclone Marcus in the Southern Indian Ocean.
Salts left over from ancient seawater reveal new information about the oxygenation of the Earth's atmosphere more than 2 billion years ago.