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Sunday, 10 February 2013

Trees Are Dying


World's Big Trees Are Dying:
Alarming Increase in Death Rates Among Trees 100-300 Years Old

The largest living organisms on the planet, the big, old trees that harbour and sustain countless birds and other wildlife, are dying.
A report by three of the world's leading ecologists in the journal Science warns of an alarming increase in deathrates among trees 100-300 years old in many of the world's forests, woodlands, savannahs, farming areas and even in cities.
"It's a worldwide problem and appears to be happening in most types of forest," says lead author Professor David Lindenmayer of the ARC Centre of Excellence for Environmental Decisions (CEED) and Australian National University.
"Large old trees are critical in many natural and human-dominated environments. Studies of ecosystems around the world suggest populations of these trees are declining rapidly," he and colleagues Professor Bill Laurance of James Cook University, Australia, and Professor Jerry Franklin of the University of Washington, USA, say in their Science report.
"Research is urgently needed to identify the causes of rapid losses of large old trees and strategies for improved management. Without… policy changes, large old trees will diminish or disappear in many ecosystems, leading to losses of their associated biota and ecosystem functions."
Prof. Lindenmayer says they were first tipped off to the loss of big old trees while examining Swedish forestry records going back to the 1860s. Then a 30-year study of Mountain Ash (Eucalyptus regnans) forest in Australia confirmed not only that big old trees were dying en masse in forest fires, but also perishing at ten times the normal rate in non-fire years -- apparently due to drought, high temperatures, logging and other causes.
Looking round the world, the scientists found similar trends at all latitudes, in California's Yosemite National Park, on the African savannahs, in the rainforests of Brazil, the temperate forests of Europe and the boreal forests of the far north. Losses of large trees were also pronounced in agricultural landscapes and even cities, where people make efforts to preserve them.
"It is a very, very disturbing trend. We are talking about the loss of the biggest living organisms on the planet, of the largest flowering plants on the planet, of organisms that play a key role in regulating and enriching our world," says Professor Bill Laurance of James Cook University.
"Large old trees play critical ecological roles. They provide nesting or sheltering cavities for up to 30% of all birds and animals in some ecosystems. They store huge amounts of carbon. They recycle soil nutrients, create rich patches for other life to thrive in, and influence the flow of water within landscapes and the local climate.
"Big trees supply abundant food for numerous animals in the form of fruits, flowers, foliage and nectar. Their hollows offer nests and shelter for birds and animals like Australia's endangered Leadbeater's Possum (Gymnobelideus leadbeateri) -- and their loss could mean extinction for such creatures.
"In agricultural landscapes, large old trees can be focal points for vegetation restoration; they help connect the landscape by acting as stepping stones for many animals that disperse seeds and pollen," he says.
The alarming decline in old trees in so many types of forest appears to be driven by a combination of forces, including land clearing, agricultural practices, man-made changes in fire regimes, logging and timber gathering, insect attack and rapid climatic changes, says Prof. Jerry Franklin.
"For example, populations of large old pines in the dry forests of western North America declined dramatically over the last century because of selective logging, uncharacteristically severe wildfires, and other causes," he adds.
The researchers liken the global loss of big trees to the tragedy that has already befallen the world's largest mammals, such as elephants, rhinos, tigers and whales, cautioning that almost nowhere do conservation programs have the time-frames lasting centuries, which are needed to assure the survival of old trees.
"Just as large-bodied animals such as elephants, tigers and cetaceans have declined drastically in many parts of the world, a growing body of evidence suggests that large old trees could be equally imperilled," they warn.
They call for an urgent world-wide investigation to assess the extent of big tree loss, and to identify areas where big trees have a better chance of survival.
Their paper "Rapid Worldwide Declines of Large Old Trees, by David B. Lindenmayer, William F. Laurance and Jerry F. Franklin appears in a recent issue of the journal Science.
Old trees must be protected to save the homes of more than 1,000 different bird and mammal species who nest, says a study from the University of British Columbia. Most animals can't carve out their own tree holes and rely on holes already formed. The study found that outside of North America, most animals nest in tree holes formed by damage and decay, a process that can take several centuries.
The study, published in the journal Frontiers in Ecology and the Environment, examined the holes birds and mammals were using for nesting around the world. The research team, led by Kathy Martin, a professor in the Faculty of Forestry at UBC, wanted to find out how the holes were created and which species were using them.
In forests, tree holes are created either quickly by woodpeckers or more slowly as trees age and begin to decay. Birds like owls, songbirds and parrots, and mammals like flying squirrels and opossums, make homes in the holes of trees because they offer safe environments for sleeping, reproduction and raising young. Insects, snakes and amphibians will also make use of tree cavities.
Martin and her research team found that on most continents -- South America, Europe, Asia and Australia -- more than 75 per cent of the holes used by birds and mammals were created by damage and decay.
"When wildlife depends on decay-formed cavities, they are relying on large living trees," says Martin, also a senior research scientist with Environment Canada. "Most trees have to be more than 100 years old before decay cavities begin to form and often several centuries old before large cavities or many cavities develop in one tree."
In North America, the team found very different results -- woodpeckers make up to 99 per cent of the cavities used by birds and mammals.
Worldwide, tree holes are in short supply and many efforts to protect the animals living in these holes have been focused on protecting woodpeckers because it was presumed that they make most of the holes.
"Most forest policies help protect younger trees but promote the harvest of older, larger, living trees -- the very trees needed by cavity-nesting animals," says Martin.
The researchers monitored 2,805 tree holes in Canada, Poland and Argentina between 1995 and 2010. They identified how the holes were formed and every year checked to see if they were still usable.
"Some of the tree cavities in Canada were used 17 times in 13 years by up to five different species," says Martin. "One tree cavity can sustain a lot of wildlife over its lifetime."
Martin and her research team found that although woodpeckers live in Argentina and Poland and make good quality holes, holes formed from decay were used more extensively outside of North America because they last much longer.
In Argentina, woodpecker holes would last only about two years, while those made by decay could be used as homes for 25 years. In Poland, the differences were less dramatic: the woodpecker-formed holes survived for six years and decay-formed holes for 13 years. In Canada, where animals nest in woodpecker holes, all holes last the same length of time, about 14 years after they are created.
"The value of these large living trees needs to be recognized and we need to ensure that a supply of these trees is retained especially in tropical forest systems where decay-formed tree holes last for many years and support a lot of wildlife."
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