Tent caterpillars and their parasites
...n stands ranging in six sizes from as small as .28 hectares to 289 hectares. "What we determined," said Roland, "is that for the parasites and the viruses to be most effective, the size of the forest stand should be a minimum of about 100 hectares. Smaller forest stands served as a caterpillar refuge becaus...Agri-tech innovations promise better food security
... the no-till system has expanded from a mere 3,000 hectares in the late 1970's to around 13 million hectares in Argentina, now accounting for about 50 percent of the lands in agricultural production, said Robe...Preserving pine's genetic heritage
...ld wide plantation area totalling around 4 million hectares radiata pine is a very versatile species and is used widely in Australia for building and construction, for paper making, in composite wood products and in hygiene products. Natural stands of radiata pine are now very limited with three on the Calif...Smithsonian researchers show Amazonian deforestation accelerating
...tion from 1995 to 2000 averaged almost two million hectares a year, said Laurance. Thats equivalent to seven football field a minute, and its comparable to the bad old days in the 1970s and 1980s, when forest loss in the Amazon was catastrophic. The research teams findings are important because the Brazilian...Battle to save last stronghold of the red squirrel
... squirrel viability. Kidland Forest, which is 2050 hectares and within Northumberland's Cheviot Hills, is considered to be an ideal conservation area for the threatened red squirrel due to its isolation and inaccessibility for grey squirrels currently colonising Northumberland. The joint project assessed the ...Established ecological relationship is flawed says new study
...tively slowly. It was at intermediate scales (from hectares to 10 km2) that species richness accumulated most rapidly as the size of the area sampled was increased. Professor Mick Crawley comments: What our work shows is that you can not predict species richness at a large scale from survey work carried out (...Tax top of the food chain to aid environmental sustainability
...d waterlogging of irrigated soils), and 10 million hectares of productive land are severely degraded and abandoned each year. Replacing agricultural land accounts for 60 percent of deforestation now occurring worldwide. The new book, with 23 co-authors and three co-editors, represents the synthesis and fi...Carbon sequestration: seeing the forest for its trees
...es. In 1980 it was estimated that some 21 million hectares of tropical land were being used for tree plantations globally; by 1999 estimates stood at 60 million. In addition, nitrogen deposition has become an increasing concern worldwide, and so any information indicating that nitrogen deposition may aid i...Carbon cycling and species composition: seeing the forest for its trees
...es. In 1980 it was estimated that some 21 million hectares of tropical land were being used for tree plantations globally; by 1999 estimates stood at 60 million. In addition, nitrogen deposition has become an increasing concern worldwide, and so information indicating that nitrogen deposition may aid in...2000 FALL MEETING: updated press conferences, press registration, and other information
...has increased dramatically, from about 1.2 million hectares per year in the 1960s to 3 million hectares per year in the 1990s. Boreal forest fires are an important source of atmospheric trace gases. Smoke...Tailoring new cotton genes for industry
...thern Queensland. In the 1998-1999 season, 553,000 hectares were planted to cotton, with 15% of the crop being genetically modified (transgenic). Ingard, Australia's transgenic cotton, has a natural resistance to a major pest, the cotton bollworm. Growth of Ingard cotton has resulted in a drop of 40-50% in ...Tropical tree distribution could have implications for forest management, conservation
...landscape. A census of six large plots of 25 to 52 hectares (60 to 130 acres) in five South American and Asian countries is described in this week's Science and shows most tropical trees are aggregated, or clumped. The size of the data set should help end decades of debate on this subject, according to Patri...GM seed may be more widespread than we think
...mercial planting in Europe. In Britain alone, 9000 hectares were sown with the adulterated seed in 1999, followed by 4700 hectares this spring. In other European countries, including France and Sweden, ministers have considered ...New science resources available from the ESA
... a South American tree that has taken over 280,000 hectares of south Florida. The Ecological Society's fifth edition of Issues in Ecology describes how some foreign plants and animals, like the Brazilian pepper, crossed oceans, mountain ranges, rivers, and inhospitable climate zones to invade and colonize ne...Could fish clean up sewage works?
...ulation of about 100 000, would require almost 100 hectares of tanks of fish, Drenner says. To improve on this, he will try out a new system this summer that uses taller tanks, about 3 metres deep. The idea is to reduce the land area needed by increasing the number of fish in each tank. "It's analogous to sav...USGS studies wildfire ecology in the western United States
...climate -- is disappearing. Of the roughly 100,000 hectares of shrubland present in the National Conservation Area in 1979, only 46,000 hectares remain. To put it simply, Knick says, the shrubland is burning up. Wildfire incidence has incre...University Of Toronto team discovers salt tolerance gene in plants
... century due to salinity. Approximately 10 million hectares are lostannually because of saline conditions. Irrigation water usually containsdissolved salts, and traditional solutions to this problem-- such ashigh-quality irrigation water and the installation of drainage systems-- areexpensive and inaccessible...Protocol For Sustainable Exploitation Of Non-Timber Tropical Forest Resources Is Gaining Ground
An estimated 200 million hectares of forest were lost between 1980and 1995, three times thestate of Texas, and the yearly global deforestation rate is evaluated at about16 million hectares. Thenews is not all grim, however. Forests are destroyed all over the world to makeroom for e...Duke Studies Show That Environmental Effects Of Dams Extend To Insect Life
..." she said. "Each armadillo requires three or four hectares in order tosurvive, and the average size of the smaller islands is much less." She bolstered this observation with experiments using cages to protectant colonies from armadillo predation, and found this significantly increasedtheir survival r...... Wood Program. Precious Woods Ltd. manages 81,000 hectares (ha) of "terra firma" in Amazonas,Brazil for sustainable forest production. They have used advanced planning forlong-term management with innovative inclusion of ecological principles. Theforest management project began in 1992 and, since 1994, Prec...