May 31, 2009
Yale researchers analyzed 240 independent studies that explored the recovery of degraded ecosystems due both to human-caused disturbances and natural disasters. In the meta-analysi,s published in PLoS ONE the researchers, found that on average forests recover in 42 years, while ocean bottoms recover in less than a decade. Ecosystems that suffered from a variety of disturbances took on average 56 years, while those recovering from mining, invasive species, oil spill, and trawling recovered on average in only 5 years.
Deforestation in Borneo. A new meta-analysis estimates that it takes on average 56 years for forests to recover. Photo by: Rhett A. Butler.
The study found that ecosystems largely recovered quicker from natural disasters than from human ones. In addition, aquatic ecosystems recovered quicker than terrestrial ones.
"Restoration could become a more important tool in the management portfolio of conservation organizations that are entrusted to protect habitats on landscapes," added Schmitz.
The meta-analysis reported that 67 of the 240 ecosystems studied showed no recovery, however over half of these ecosystems were probably studied before recovery could occur. The study estimated that 15 percent of the ecosystems studied were beyond recovery.
The researchers pointed out that the study focused on an ecosystems’ recovery to its state before the identified disturbance. However, they note that these recoveries may not mean the ecosystem returned to a truly natural state. In fact they believe that many of the ecosystems had likely already experienced large-scale changes due to human activities, such as loss in biodiversity, loss in water and air quality, and climatic changes.
"We recognize that humankind has and will continue to actively domesticate nature to meet its own needs. The message of our paper is that recovery is possible and can be rapid for many ecosystems, giving much hope for a transition to sustainable management of global ecosystems,” concluded co-author Holly Jones, and Yale Ph.D. student.
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Recovery from worst mass extinction took 30 million years
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