Navigation Links
The world's big trees are dying
Date:12/7/2012

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 today's issue of 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 Washington University, 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.


'/>"/>
Contact: David Lindenmayer
david.lindenmayer@anu.edu.au
61-427-770-593
Julian Cribb & Associates
Source:Eurekalert

Related biology news :

1. Researchers test solution to fungal disease of ash trees
2. Western aspen trees commonly carry extra set of chromosomes
3. Do Australias giant fire-dependent trees belong in the rainforest?
4. Old deeds, witness trees offer glimpse of pre-settlement forest in West Virginia
5. Droughts are pushing trees to the limit
6. EARTH: Antarctic trees surprise scientists
7. Panda preferences influence trees used for scent marking
8. Diseased trees new source of climate gas
9. Thieving rodents: Did they save tropical trees?
10. Have thieving rodents saved tropical trees?
11. Rodent robbers good for tropical trees
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/6/2017)... 6, 2017 Forecasts by Product ... Readers, by End-Use (Transportation & Logistics, Government & Public ... & Fossil Generation Facility, Nuclear Power), Industrial, Retail, Business ... Are you looking for a definitive report on ... ...
(Date:4/4/2017)... , April 4, 2017   EyeLock LLC , ... that the United States Patent and Trademark Office (USPTO) ... covers the linking of an iris image with a ... and represents the company,s 45 th issued patent. ... is very timely given the multi-modal biometric capabilities that ...
(Date:3/30/2017)... March 30, 2017 Trends, opportunities and forecast ... behavioral), by technology (fingerprint, AFIS, iris recognition, facial recognition, ... others), by end use industry (government and law enforcement, ... and banking, and others), and by region ( ... Asia Pacific , and the Rest ...
Breaking Biology News(10 mins):
(Date:4/27/2017)... ... April 27, 2017 , ... Mitotech S.A, a Luxembourg based clinical stage biotechnology ... patients. LHON is a rare devastating genetic disease that leads to a sudden and ... group of 20 patients carrying 11778, 14484 and 3460 mutations and having experienced the ...
(Date:4/27/2017)... ... April 27, 2017 , ... Sierra Instruments ... based on capillary thermal mass flow technology provide exponentially more accurate mass flow ... Over 80% of all industrial processes—such as those involving chemical reactions, combustion, respiration, ...
(Date:4/27/2017)... -- Pendant Biosciences, Inc. (formerly Nanoferix, Inc.), a privately-held advanced ... technologies, today announced that it has been accepted into ... . Shawn Glinter , Founder ... are excited to become part of the JLABS @ ... to be the first Tennessee -based ...
(Date:4/26/2017)... ... April 26, 2017 , ... Led by ex-FDA official Peggy ... comes to Tampa, San Francisco and Boston in 2017. The 2016 sold-out ... such as Pfizer Inc., Teva Pharmaceuticals, Advaxis, Inc., Ocular Therapeutix Inc., Cell Culture ...
Breaking Biology Technology: