Subantarctic seabed creatures shed new light on past climate
September 1, 2016 04:59 PM - British Antarctic Survey via EurekAlert!
A new marine biodiversity study in one of the largest Marine Protected Areas in the world reveals the impact of environmental change on subantarctic seabed animals and answers big questions about the extent of South Georgia's ice sheet during the Last Glacial Maximum around 20,000 years ago.
Reporting this week in the Journal of Biogeography researchers at British Antarctic Survey (BAS) describe how colonies of seabed creatures, such as sea sponges - that play an important role in absorbing and storing carbon from the atmosphere - can take thousands of years to recover from major glaciation events.
Meet a Surprising Plastic Alternative: Milk
September 1, 2016 07:07 AM - s.e. smith, Care2
What if you could have your packaging and eat it too? We’ve seen rice paper packaging on Japanese candies, but edible plastic? Thanks to researchers at the USDA, it’s not too far in the future.
And it’s not just an edible and environmentally-friendly plastic alternative; it’s actually better at keeping food fresh than petroleum-based plastics. It’ll be a few years before you see the material on shelves — don’t start chomping down just yet — but it represents a big revolution in the way we view food packaging.
Sediments control methane release to the ocean
August 31, 2016 04:12 PM - University of Tromso via ScienceDaily
Methane is stored under the sea floor, concentrated in form of hydrates, crystalline ice structures that stay stable under high pressure and in low temperatures. Several studies suggest that as the ocean warms, the hydrates might melt and potentially release methane into the ocean waters and atmosphere.
Several studies suggest that as the ocean warms, the hydrates might melt and potentially release methane into the ocean waters and atmosphere. This potent climate gas is profusely leaking from the seafloor in an area offshore western Svalbard, which is close to the gas hydrate stability zone.
There, scientists have discovered over 250 methane flares in water depths from 90 to 240 meters.
“Previous studies indicate that these seeps could be linked to gas hydrate dissociations. We suspected that dissociation of gas hydrate is not the primary control on seafloor methane seepage. We suggest that there is a strong lithological control on methane seepage.” says Dr. Giuliana Panieri, scientist at CAGE.
Climate change has less impact on drought than previously expected
August 31, 2016 03:47 PM - University of California – Irvine via ScienceDaily
As a multiyear drought grinds on in the Southwestern United States, many wonder about the impact of global climate change on more frequent and longer dry spells. As humans emit more carbon dioxide into the atmosphere, how will water supply for people, farms, and forests be affected?
A new study from the University of California, Irvine and the University of Washington shows that water conserved by plants under high CO2 conditions compensates for much of the effect of warmer temperatures, retaining more water on land than predicted in commonly used drought assessments.
According to the study published this week in the Proceedings of the National Academy of Sciences, the implications of plants needing less water with more CO2 in the environment changes assumptions of climate change impacts on agriculture, water resources, wildfire risk, and plant growth.
Obama Creates the World's Largest Marine Reserve
August 30, 2016 07:12 AM - Steve Williams, Care2
The Papahānaumokuākea Marine National Monument, first named a national monument by President George W. Bush in 2006, is a massively important marine nature reserve.
Designated a World Heritage site, the region surrounding the Northwestern Hawaiian Islands teems with more than 7,000 marine and land species — some of which are unique to the area, including endangered whales and sea turtles. As a result, the region has been deemed irreplaceable by scientists.
Study finds shark fins & meat contain high levels of neurotoxins linked to Alzheimer's disease
August 29, 2016 04:45 PM - University of Miami Rosenstiel School via EurekAlert!
In a new study, University of Miami (UM) scientists found high concentrations of toxins linked to neurodegenerative diseases in the fins and muscles of 10 species of sharks. The research team suggests that restricting consumption of sharks can have positive health benefits for consumers and for shark conservation, since several of the sharks analyzed in the study are threatened with extinction due to overfishing.
Fins and muscle tissue samples were collected from 10 shark species found in the Atlantic and Pacific Oceans for concentrations of two toxins--mercury and β-N-methylamino-L-alanine (BMAA). "Recent studies have linked BMAA to neurodegenerative diseases such as Alzheimer's disease and amyotrophic lateral sclerosis (ALS)," said Deborah Mash, Professor of Neurology and senior author of the study.
The Sound of a Healthy Reef
August 29, 2016 03:18 PM - Woods Hole Oceanographic Institution
A new study from the Woods Hole Oceanographic Institution (WHOI) will help researchers understand the ways that marine animal larvae use sound as a cue to settle on coral reefs. The study, published on August 23rd in the online journal Scientific Reports, has determined that sounds created by adult fish and invertebrates may not travel far enough for larvae —which hatch in open ocean—to hear them, meaning that the larvae might rely on other means to home in on a reef system.
Blending wastewater may help California cope with drought
August 26, 2016 11:56 AM - University of California – Riverside via EurekAlert!
Recycled wastewater is increasingly touted as part of the solution to California's water woes, particularly for agricultural use, as the state's historic drought continues. The cost of treating wastewater to meet state health standards for reuse and to reduce salt levels that damage crops presents a new set of challenges, however.
Researchers at the University of California, Riverside have developed an economic model that demonstrates how flexible wastewater treatment processes which blend varying levels of treated effluent can be optimized to produce a water supply that is affordable, and meets and surpasses a variety of water quality requirements.
Ecological consequences of amphetamine pollution in urban streams
August 25, 2016 03:32 PM - Cary Institute of Ecosystem Studies via EurekAlert!
Pharmaceutical and illicit drugs are present in streams in Baltimore, Maryland. At some sites, amphetamine concentrations are high enough to alter the base of the aquatic food web. So reports a new study released today in the journal Environmental Science & Technology, which is one of the first to explore the ecological consequences of stimulant pollution in urban streams.
Lead author Sylvia S. Lee conducted the work as a postdoctoral researcher at the Cary Institute of Ecosystem Studies. Lee, now with the Environmental Protection Agency, comments, "Around the world, treated and untreated wastewater entering surface waters contains pharmaceuticals and illicit drugs that originate from human consumption and excretion, manufacturing processes, or improper disposal. We were interested in revealing how amphetamine exposure influences the small plants and animals that play a large role in regulating the health of streams."
Perfluorinated compounds found in African crocodiles, American alligators
August 25, 2016 11:12 AM - National Institute of Standards and Technology (NIST) via EurekAlert!
American alligators and South African crocodiles populate waterways a third of the globe apart, and yet both have detectable levels of long-lived industrial and household compounds for nonstick coatings in their blood, according to two studies from researchers at the Hollings Marine Laboratory in Charleston, South Carolina, and its affiliated institutions, which include the National Institute of Standards and Technology.
Production of some compounds in this family of environmentally persistent chemicals--associated with liver toxicity, reduced fertility and a variety of other health problems in studies of people and animals--has been phased out in the United States and many other nations. Yet all blood plasma samples drawn from 125 American alligators across 12 sites in Florida and South Carolina contained at least six of the 15 perfluorinated alkyl acids (PFAAs) that were tracked in the alligator study.