trees 2 5

Tag: "trees" at biology news

Scientists must offer solutions for conserving tropical forests in a rapidly changing world

...cord suggests that reproductive activity by forest trees is increasing; and at La Selva, Costa Rica, diameter-growth rates decreased among surviving individuals for cohorts of nine species measured annually for 17 years. These mysterious changes may be caused by large-scale drivers, such as increasing car...

Logging doubles threat to the Amazon, rivaling clear-cutting, study suggests

... detecting clear-cut swaths of land, where all the trees are removed to clear space for farming or grazing....cale, allowing researchers to identify areas where trees have been thinned, due mostly to "selective logging." In this type of deforestation, only certain ma...

Wolves' top-down effect

...ly because beavers could no longer find sufficient trees with which to build their dams," says Hebblewhite. In addition, songbirds, such as the American Redstart, which is strongly dependent on willow, also vanished from the wolf-excluded area. Although the presence of people in the Bow Valley area also ...

Seeing the forest and the trees

...t of the simulations, they found that the types of trees remaining after each scenario played out had a lar...e forest's carbon-storage capacity--so long as the trees are not harvested. By contrast, selectively logging trees with high wood density was found to reduce...

Plant wounds trigger bacteria

...ing winter and a wound forms in spring. Such fruit trees as cherries and peaches, raspberries and high-quality vine grapes like chardonnay and cabernet sauvignon tend to be susceptible to the disease, which can stunt or kill a plant. Grafting can also lead to infections. "There are really no chemicals, no...

Protein behind autumn color splendor identified

...s there is no autumn, but in our climate deciduous trees and other perennials lose their chlorophyll in the fall. The reason for this is that the proteins in the leaves contain amino acids that the plant needs to recycle. The leaves' proteins are therefore degraded and the amino acids are stored in the tru...

Shade trees getting 'scorched' by plant disease

...rial leaf scorch is severely affecting urban shade trees grown not only to provide shade, but to help clear...ent loss of value plus replacement costs for older trees affected by this disease is estimated at $8,000 per tree. Landowners and tree care professionals in ...

NC State researchers redesign life for Mars and beyond

...Arctic Circle shouldn't be rushing out to buy palm trees just yet. It'll take years and much more study before plants will be able to survive outside of their usual habitats. Moreover, there could be deleterious side effects to this type of genetic manipulation. What's important, the researchers say, is th...

Emerald Spectre haunts Ontario's ash forests

...first detected following an unusual dieback of ash trees in southeastern Michigan and southwestern Ontario ...y eggs under tree bark and the feeding larvae kill trees by disrupting the flow of nutrients in the soft tissues under the bark. The new study funded by the...

Birds and bats sow tropical seeds

Restoring the rich diversity of trees that once characterized expansive tracts of tropic...e. "We'll test the proposition that immigration of trees into this tropical landscape, the remnants and forest fragments that still exist in it is dispersal-...

Quick identification needed to save Florida's citrus industry from devastating disease

...greening (huanglongbing) in samples collected from trees in South Florida poses a definite threat to Florid...hloem system of citrus plants causing the infected trees to yellow, decline, and possibly die within a few years. The bacterium is spread by an insect, the c...

High carbon dioxide levels spur Southern pines to grow more needles

...than untreated pines. Higher needle percentages in trees receiving the gas were recorded even during years ...ils were driest -- when both treated and untreated trees suffered dryness-related needle losses and less leaf growth. "This would imply that, even under dro...

Toxic flood lifts lid on common urban pollution problem

...e contaminants. Planting vegetation and especially trees also creates aesthetically pleasing buffer zones, providing storm water flooding control and other benefits. Finally, cities can use high-tech street sweeping equipment that is very effective at capturing pavement contaminants. "If you pick up this...

Ants, not evil spirits, create devil's gardens in the Amazon rainforest, study finds

... rainforest. "Devil's gardens are large stands of trees in the Amazonian rainforest that consist almost en...s gardens occur. One hypothesis is that D. hirsuta trees release toxic secretions that kill competing plants--a process botanists call allelopathy. Others ar...

Lands surface change on Alaska tundra creating longer, warmer summers in Arctic

.... The longer growing season is allowing shrubs and trees to slowly migrate northward. The increasing woody vegetation is further warming the near-surface atmosphere by absorbing rather than reflecting incoming solar radiation. "The vegetation change is pretty dramatic," Epstein said. "The tundra is gettin...

Past droughts geographically widespread in the West, according to tree-ring data

...hen scientists from the tree-ring lab will re-core trees in the Salt and Verde watersheds to gather new data from the last 40 years, a period when the watersheds have experienced both record wet and record dry episodes. The findings of the second phase will likely be available in the summer of 2007. Key p...

President Bush's cut to AIDS prevention in Africa would be devastating

...hat has overwhelmed much of the forest floor where trees were removed, Gilllespie said. Because elephants love to eat the shrub, they trample through the clearings, adding yet another obstacle for the growth of new trees, he said. "Knowledge of how particular species are affected by various forms of ecolo...

Affymetrix and ParAllele Launch Industry's Most Comprehensive Product Line for Targeted Genotyping

...hat has overwhelmed much of the forest floor where trees were removed, Gilllespie said. Because elephants love to eat the shrub, they trample through the clearings, adding yet another obstacle for the growth of new trees, he said. "Knowledge of how particular species are affected by various forms of ecolo...

Logging changed ecological balance for monkeys, damaged health

...hat has overwhelmed much of the forest floor where trees were removed, Gilllespie said. Because elephants love to eat the shrub, they trample through the clearings, adding yet another obstacle for the growth of new trees, he said. "Knowledge of how particular species are affected by various forms of ecolo...

Ants win a waxy race

...each their nests and food supplies. Some Macaranga trees in South East Asia have waxy stems to protect themselves from ants and other insects. Only one specific ant is capable of running up and down the stem, in order to access its nest and food supply inside the stem. Tanja Bruening and Holger Bohn from ...

1 2 3 4 5 6 7