Tag: "spring" at biology news

Collapse of simple life forms linked to mass extinction 200 million years ago

...ple of productivity, Ward explained, occurs in the spring when fertilizer washes into waterways and triggers large algae blooms. The processes at work in that scenario were reversed 200 million years ago, he said. There is no definitive evidence yet on what caused the demise of so many species, Ward said. H...

URI professor investigates the muscle behind blue mussels

...nergy and resources trying to reproduce during the spring and summer. It isnt easy. Their offspring are hardly conceived in a conventional fashion. Both male and female mussel continually secrete eggs and sperm (called gamete) hoping the two will meet in the water column and become one larva. The larva spen...

Gulp! URI professor studies how sharks eat

...st sharks give birth in warm water during the late spring and early summer. If you go swimming in their "nursery," you might get bitten by an overprotective mom, according to the researcher who grew up on Kodiak Island....

New satellite study shows vegetation increases in North America

...logys James Randerson were presented at the annual spring meeting of the American Geophysical Union held May 29 to June 2 in Boston. Other study co-authors included Chris Field of the Carnegie Institute of Washington at Palo Alto, Calif. and Compton J. Tucker and Sietse Los of NASAs Goddard Space Flight ...

Remote sensing study defines "edgy" cities

... press briefing at the American Geophysical Union spring meeting in Boston on at 1 p.m. on May 29. "We're going to collect data over each of 100 cities twice a year, both day and night," explains Stefanov, a researcher at in ASU's Department of Geological Sciences and the Center for Environmental Studies...

Ill winds carry toxic dust

...l present the first results of this project at the spring meeting of the American Geophysical Union in Boston on May 30, 2001. Stefanov uses images taken by Landsat 7, a satellite operated jointly by NASA and the United States Geological Survey, to identify the areas where winds are most likely to pick up...

Scientists monitor global air pollution from space

...ased Wednesday at the American Geophysical Union's spring meeting in Boston, Massachusetts. Launched in De...b of Harvard University, who used MOPITT data this spring in a major field campaign to study air pollution from Asia. The first set of MOPITT global observa...

Reducing primary chemical emissions does not always reduce pollution

...osols," Stein told attendees today (May 31) at the spring meeting of the American Geophysical Union in Boston. "Simply controlling sulfur dioxide does not always reduce sulfate." The researchers found that the reactions involved are not linear and that reducing one component does not always reduce the ta...

Ancient oceans experienced a global surge in biological productivity

... Oceans. Hermoyian reported their findings at the spring meeting of the American Geophysical Union. The waxing and waning of biological productivity in ancient oceans offers insights into climate change, Owen explains. Biological productivity is a measure of the amount of biomass (total living matter) pro...

Shift from forest to crops lowers temperatures

...e cooling was mostprominent in the Midwest in late spring and summer, just when cropsreached their full growth. The temperature difference diminished inthe fall after the time of harvest. In 1850 croplands were on their way to being the dominant land coverin the Northeast, but forests and grasslands still d...

Tropical glaciers formed while earth was giant snowball

...es' Environmental Institute, told attendees at the spring meeting of the American Geophysical Union today (May 29) in Boston. "We wanted to determine how low-level tropical glaciers could have formed." Ice can accumulate in the tropics only if temperatures are below freezing or around freezing with lar...

Montana drought sends paleontologists to field early for largest project in state's history

... from the same rains, but the weather earlier this spring was "abnormally windy and dry--very dry. ... The wind has been fierce day after day after day," according to Ed Ryan, co-owner of Ryan's Grocery and Processing at Jordan. Lightning also started a fire that burned about 150 acres northwest of Brusett....

Rensselaer effort to pull mussels at Lake George looks promising

...-intensive effort appears to be paying off. In the spring of last year, shortly after the first adult zebra mussels were discovered in the popular recreational lake, divers collected more than 19,000 of them. Last falls harvest netted 1,800. Since April of this year, however, divers have pulled only 352 mus...

Lake tributaries in Yellowstone National Park allow unique study of whirling disease

...r in temperature, with some warming quickly in the spring and early summer while others warm more slowly. Still others may stay too cool year around for the parasite to complete its cycle and cause disease, MacConnell said. "Thermally we have a lot of variety there, so its a good outdoor laboratory," Ma...

Muddy waters: letting the Gulf of Mexico breathe again

...nearly all dissolved oxygen, turning the Gulf each spring into what's been termed a "dead zone." Dissolved oxygen levels dip below 2 parts per million, and most aquatic species can't live in waters containing less than 2 ppm of oxygen. Dissolved ox...

From July 21-Aug. 20, Smith College and collaborators to retrace historic Harriman Expedition to Alaska

...lly distributed PBS film, scheduled for release in spring 2002, as well as a companion book of essays, photographs and illustrations that Litwin will edit. Emmy Award-winners Lawrence Hott and Diane Garey of Florentine Films/Hott Productions will direct the film, for which Juneau public television station ...

Study shows top predator makes prey population vulnerable in catastrophe

... islands and hope to restart the experiment in the spring of 2003. The intent is to study how the anole lizards adapt to the new habitats they must occupy in the presence of curly-tails....

An epidemic may have gone unnoticed--DDT use in US linked to premature births in the 1960's

...istent pesticides used atthat time could produce a spring where there were no birds left to sing. Infact, bald eagle and the brown pelican were nearly driven to extinctionbefore the banning of DDT in the U.S. in 1972 brought their numbers back. Studies since then on human reproductive effects have been sug...

Researchers' mathematical model provides chagas disease insights

...eals the bugs take from chickens, which during the spring are kept indoors to brood protected from theft or predation. Chickens cannot be infected with T. cruzi whereas dogs and humans can be. But the infected dogs are much more infectious to the bugs than the infected humans, and therefore fuel population ...

New technology treats dairy wastes, odors

...er the winter months are pumped onto fields in the spring where crops utilize the manures nutrients. However, more nutrients, such as nitrogen and phosphorous, may be applied to crops than can be used effectively. InStreem is designed to use a dairys existing infrastructure to convert lagoons from waste s...

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