Doubt cast on theory of tropical forest diversity
...r latitudes. "Even though there have been climatic fluctuations in the tropics, there isn't a situation where the biological slate is essentially wiped clean," he said. "Also, it is probably difficult for plants to adapt to seasonal climates, particularly long winters, so species might just evolve slower at highe...Extreme climate variance sped extinction of local butterfly populations, researchers say
...ves that can wash out their numbers. Environmental fluctuations loom large, and when fluctuations cause an extinction, isolation prevents recolonization. Human population growth can bring urban spra...Lake mud holds secrets to forecasting future salmon abundances, Queen's researchers say
... past 2000 years have found that surprisingly wide fluctuations occurred long before humans began fishing, or conc...that climatic change is the primary cause for past fluctuations in salmon populations. The synchronous response of fish populations (including salmon, sardines and ...Imagine no restrictions on fossil-fuel usage and no global warming
...a nominal cost when one considers the recent price fluctuations at gasoline pumps across the nation, Dubey said. A typical extraction facility that could extract all current carbon dioxide emissions would require only an area of one square yard per person in the developed world. A facility of sufficient size c...Dartmouth biologists say algae might be missing mercury link in aquatic food chain
...nd that in animals in the field, there were indeed fluctuations in metals that change with the amount of algae. She points out that more research needs to be done, however, to understand the intricacies of how metals move through the food chain. "Just because low algae systems appear related to greater transfer o...NSF grant to grow methane-producing microbes in lab
...ng to temperature, carbon dioxide levels and other fluctuations during global climate change. That's why one of the observatory sites chosen for the Cornell study is McLean Bog, a few miles northeast of Cornell's Ithaca campus, where sphagnum moss and other plant materials have been accumulating for some 13,000 y...Counterintuitively, after extreme droughts, wading birds flourish
...sh. Biologists have long been puzzled by large fluctuations in nesting wading birds from year to year, with one year experiencing thousands or tens of thousands more birds than the next, Frederick said. After the 1992 upsurge, he and Ogden decided to probe the mystery using Everglades climate and nesting reco...January media highlights: GEOLOGY and GSA TODAY
...otally frozen snowball Earth. Nile River sediment fluctuations over the past 7000 years and their key role in sap...s LS2 9JT, UK. Pages 7174. An understanding of the fluctuations in climate over the Holocene and late Quaternary and their effect on the environment is essential fo...Prizes awarded in the 2002 Gottfried Wilhelm Leibniz Programme
... allows accurate conclusions to be drawn regarding fluctuations in sea levels and climatic changes on a world-wide scale. In all, Wolf-Christian Dullos work represents a crucial contribution to the understanding of the climate-ocean system. Prof. Dr. Bruno Eckhardt (41), non-linear dynamics, Marburg University ...Researchers zero in on date of early hominids
...e of magnetic reversals, but also at the degree of fluctuations of the horizontal and vertical components of the magnetic field. In a "normal" period, such as now, the magnetic field is approximated by a dipole at the center of the Earth, and the compass needle points generally north, Levi explained. During "rev......duces random motion known as stochastic dynamic fluctuations -- among the microscopic constituents of matter: ions, atoms and molecules. In a 1999 paper published in Proceedings of the National Academy of Sciences , Schuster and his colleagues suggested that electrical charge moves through DNA in a ...'Beetle Team' works out the bugs in population studies
... improve the modeling tools widely used to explain fluctuations in animal numbers. That should help the people who... habitat size can change the pattern of population fluctuations in dramatic and non-intuitive ways," King said. "We had known that, on average over time, if habitat...UF researchers: beach mice face high probability of extinction
... mice or fewer for all the sites. Large population fluctuations are typical of small mammals, but the pattern is dangerous for beach mice because their already low numbers mean a dip in the population can prove a fatal blow, the scientists said. I think if you take a particular population, almost any of them has ......opulation. Traditional notions have assumed that fluctuations in marine populations can be explained mainly by physical processes. That is, if you understand ocean circulation and other physical functions affecting marine life, then you can understand how and why populations fluctuate. Other theories of marine ...Banning animals from the bedroom could reduce Chagas Disease risk, say Science researchers
...n northwest Argentina. The model looks at seasonal fluctuations in household bug and parasite populations, and their relationship to the numbers of humans, chickens, and dogs living within a household. Data collected by the field research team show that humans, chickens, and dogs in the study villages all sleep i...Somatostatin in sexually dimorphic gene expression
...as in rats, wild-type male mice have more dramatic fluctuations in GH levels than do females. The absence of SST does not seem to alter the frequency of the fluctuation, but it raises the GH level at the low point in the cycle so the liver in males is presumably exposed to at least a moderate level of the hormon...Science study shows age, sex, weather, factors in fluctuating Soay Sheep population
...ls can accurately determine the factors that cause fluctuations in population numbers. Tim Coulson and his Cambridge University research team were up to the challenge. The results of their 11-year study of wild Soay sheep will be published in the 25 May issue of the international journal, Science . ...Study finds wind, currents play key role where young fish settle
...st that variations in currents and winds may cause fluctuations in the size of fish populations along the entire Gulf coast. Using a computer model to simulate the exchange of water and fish larvae through Aransas Pass, researchers found that many of the "fish larvae" settled in an area of sea grasses just inside...Penn researchers find proteins more dynamic than previously known
...tatic structures -- they fluctuate, and that these fluctuations are also critical for protein activity." In their research, Wand and Lee found the calmodulin protein has three distinct bands (or preferred magnitudes) of motion on a subnanosecond time scale, a richness of variation that was not previously known. ...Deregulation will cause significant fluctuations in electricity prices, new study reveals
...nvestment in new plants but also cause significant fluctuations in the price Americans pay for electricity in the next decade, according to a study released this week by Stanford`s Energy Modeling Forum (EMF). The new study follows an EMF report published three years ago that foreshadowed the current California e...