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Two 91自拍 scientists have unveiled a new statistical method for estimating migration flows between countries. They show that rates of migration are higher than previously thought, but also relatively stable, fluctuating between 1.1 and 1.3 percent of global population from 1990 to 2015. In addition, since 1990 approximately 45 percent of migrants have returned to their home countries, a much higher estimate than other methods.

New 91自拍 from the 91自拍 and Stanford University combines models of ocean conditions and animal metabolism with published lab data and paleoceanographic records to show that the Permian mass extinction in the oceans was caused by global warming that left animals unable to breathe. As temperatures rose and the metabolism of marine animals sped up, the warmer waters could not hold enough oxygen for them to survive.

In a comprehensive study of healthy corals published Nov. 22 in the journal Nature Communications, a team of scientists from the 91自拍 Bothell, Pennsylvania State University and Oregon State University report that coral bacteria are a surprisingly diverse bunch 鈥 and that different sections of the coral body can host unique communities of bacteria.

A new, free tool with temperature and precipitation records across Washington, Oregon, Idaho and western Montana as far back as 1881 lets users play around to discover significant trends. It also includes historical snow records for Washington state.

Here in what is called the Anthropocene era, humans and our urban environments appear to be driving accelerated evolutionary change in plants, animals, fungi, viruses and more 鈥 changes that could affect key ecosystem functions and thus human well-being. These interactions between evolution and ecology are called “eco-evolutionary feedback.” The National Science Foundation has awarded a five-year, $500,000 grant to a multi-institution 91自拍 network team headed by Marina Alberti, 91自拍 professor of urban design and planning, to advance…

A study by an international team of 91自拍ers, including from the 91自拍, determines that carved stone tools, also known as Levallois cores, were used in Asia 80,000 to 170,000 years ago. With the find 鈥 and absent human fossils linking the tools to migrating populations 鈥 91自拍ers believe people in Asia developed the technology independently, evidence of similar sets of skills evolving throughout different parts of the ancient world.

To better understand how state governments across the United States execute their diverse responsibilities, look at their internet footprint, says a new study by 91自拍ers at the 91自拍, Harvard University, and Northeastern University.

Researchers from the 91自拍 have shown how Magellanic penguins fare during the winter months when they spend months at sea feeding. They have discovered that oceanographic features are more likely to negatively impact the body conditions of Magellanic penguin females, but not males, when the penguins return to their nesting grounds in spring.

A study led by the 91自拍 is the first large-scale trial of hundreds of PTSD patients, including veterans and survivors of sexual assault, to measure whether patient preference in the course of treatment impacts the effectiveness of both cognitive behavioral therapy and use of selective serotonin reuptake inhibitors, a type of antidepressant often prescribed for PTSD.

Engineers at the 91自拍 have developed 3D printed devices that can track and store their use 鈥 without using batteries or electronics. Instead, this system uses a method called backscatter, through which a device can share information by reflecting signals that have been transmitted to it with an antenna.

A new study led by the 91自拍 found that while dead whales are valuable sources of fat and protein for some polar bears, this resource will likely not be enough to sustain most bear populations in the future when the Arctic becomes ice-free in summers.

A new analysis that uses high-resolution data for 24 ocean regions in Africa, Europe, North and South America and Australasia shows that 14 percent of the overall seafloor shallower than 1,000 meters (3,280 feet) is trawled. The paper shows that the footprint of bottom-trawl fishing on continental shelves and slopes across the world’s oceans often has been substantially overestimated.