News articles tagged with 'tree' (Page 18)
Presence of wolves allows aspen recovery in Yellowstone
— 27 Jul 2007 00:01 | EnvironmentThe wolves are back, and for the first time in more than 50 years, young aspen trees are growing again in the northern range of Yellowstone National Park. The findings of a new study,…
Northern forests less effective than tropical ones in reducing global warming
— 22 Jun 2007 00:01 | EnvironmentForests in the United States and other northern mid- and upper-latitude regions are playing a smaller role in offsetting global warming than previously thought, according to a study…
Ocean currents carried kapok seeds from South America to Africa
— 17 Jun 2007 00:01 | EnvironmentCelebrated in Buddhist temples and cultivated for its wood and cottony fibers, the kapok tree now is upsetting an idea that biologists have clung to for decades: the notion that African…
Some forest birds can survive in agricultural countryside with limited habitat conservation
— 24 May 2007 19:45 | EnvironmentSome tropical forest birds can survive alongside humans if given a helping hand, according to a recent study by Cagan H. Sekercioglu, senior scientist at the Stanford University Centre…
Fossilised trees mystery solved
— 18 Apr 2007 19:25 | Geology and palaeontologyAn international research team from the Cardiff University, Binghamton University, New York and from New York State Museum has found evidence of the Earths earliest forest trees, dating…
Tundra disappears
— 7 Mar 2007 00:22 | EnvironmentForests of spruce trees and shrubs in parts of northern Canada are taking over what were once tundra landscapes - forcing out the species that lived there. This shift can happen at…
Lessons in wood formation from Arabidopsis
— 5 Mar 2007 07:00 | BiologyWood is formed from secondary xylem tissue consisting of cells with a heavily thickened secondary cell wall that is enriched in lignin and cellulose. In contrast, primary cell walls…