Earth

Agriculture

Frogs: Clues to how weed killer may feminize males

Atrazine, a widely used agricultural herbicide, not only can alter hormone levels in the developing frogs, but also perturb their physical development — and lead to an excess number of females, researchers report. Their new findings may help explain observations reported by a number of other research groups that at least in frogs, fairly low concentrations of atrazine can induce a feminization — or demasculinization.

Paleontology

Ancient DNA suggests polar bears evolved recently

A study of a rare Norwegian fossil narrows down when polar bears evolved and finds they are closely related to modern-day brown bears in Alaska.

Earth

Frogs: Weed killer creates real Mr. Moms

Several months back, a Berkeley undergraduate began witnessing distinctly odd behavior in frogs she was caring for in the lab. At about 18-months old, some frisky guys began regularly mounting tank mates, as if to copulate. Except that their chosen partner was invariably male. He had to be. Because genetically, every animal in the tank was male.

Climate

IPCC looks to vet, report climate-science better

Major U.S. science organizations aren’t the only ones to realize that the climate-science community has bungled – and badly – its portrayals of research on global change in recent months, if not years, and its responses to criticisms. Yesterday, the Intergovernmental Panel on Climate Change (a group established by the United Nations and World Meteorological Organization) said: “we recognize the criticism that has been leveled at us and the need to respond.” So will be convening an “independent review” panel to investigate what the organization’s procedures should be to vet not only the data it uses and how to synthesize conclusions based on those data, but also how it should convey those conclusions (and any necessary caveats) in reports to the public and policymakers.

Health & Medicine

Germs in tobacco are potential source of respiratory infections blamed on smoking

Tests find hundreds of bacterial species in major cigarette brands.

Life

Hydrothermal vents sometimes colonized from afar

Deep-sea currents can waft larvae hundreds of kilometers.

Ecosystems

Sea of plastics

Oceanographers are finding more patches of floating polymers, some up to 20 meters deep.

Animals

Whale hunts: Discussions on lifting the ‘ban’

The International Whaling Commission will formally address its future, next week, at a meeting in St. Petersburg, Fla. Once comprised of whaling nations, the IWC now includes member states just as likely to condemn any hunting of cetaceans. That internal tension is guiding the meeting’s agenda. On it’s plate: whether to overturn the organization’s long-standing moratorium on commercial whaling.

Science & Society

Placement of marine reserves is key

A study finds that focusing on the heaviest-fished areas can help meet conservation goals.

Climate

Climate science: Credibility at risk, scientists say

Publication of hacked emails exchanged by climate scientists. News accounts of problems in vetting data used in climate-assessment reports. Charges by critics that scientists won’t release their raw data so that others might independently vet published analyses of climate trends. Taken together, these events have marred the reputations of climate scientists, the Intergovernmental Panel on Climate Change and perhaps science generally. Or so concluded a distinguished panel of science luminaries.

Tech

Leasing car batteries to the power company

Most people, on average, drive their cars only an hour or two a day. The rest of the time, those pricey vehicles sit parked on the street or in some garage. But if those cars had a big bank of batteries – typical of today’s gasoline hybrids or soon-to-hit-the-road plug-in hybrids – they could be earning their owners money while sitting parked. Maybe $5 to $10 a day, just by serving as a back-up energy-storage system for the electric-utility grid.

Earth

Sea levels erratic during latest ice age

Mineral crusts deposited 81,000 years ago in a Mediterranean island’s caves suggest an abrupt jump in sea level.