Streams need trees to withstand climate change

February 10, 2012

( -- More than twenty years of biological monitoring have confirmed the importance of vegetation for protecting Australia's freshwater streams and rivers against the ravages of drought and climate change.

Researchers from Monash University, the Environment Protection Authority and the Arthur Rylah Institute for Environmental Research studied the effects of drought on Australia's fragile freshwater ecosystems using data collected in Victoria before, during and after the severe drought that lasted from 1997 until 2009. 

The sustained monitoring allowed researchers to compare how sites with differing levels of vegetation responded to sustained drought.

The research, published in Global Change Biology, showed streams with extensive surrounding vegetation, whether natural or re-planted, were healthier, both in terms of water quality and biodiversity. These sites were much more robust in the face of drought than sparsely vegetated areas.

Dr. Ross Thompson, of the Australian Centre for Biodiversity at Monash University's School of Biological Sciences, said the results provided clues as to how Australia's waterways and surrounding areas would respond to .

"Changing climate is a reality, and even with current efforts to manage carbon emissions it will take decades to reverse the patterns of warming which we are already seeing. It's incredibly important to understand how we can better manage the environment in the face of this challenge," Dr. Thompson said. 

Climate change is expected to cause reduced river flows through decreased or more variable rainfall. Extreme weather events, such as drought are expected to become more frequent and severe. This would be exacerbated by increasing agricultural demands for water.

Dr Thompson said reduced river flow would impact water quality, aquatic habitat, and the ability of organisms to move around in an ecosystem. These effects would likely be aggravated by human activity, and together with rising water temperatures would have a negative impact on biodiversity.

"This study shows that replanting vegetation around streams not only acts to absorb carbon from the atmosphere, helping us arrest climate change in the future, but may also work now to protect biodiversity through providing cool refuges and protecting habitat in warming landscapes," Dr. Thompson said. 

The research was supported by an Australian Research Council Linkage grant, with Monash University working in partnership with state and regional policy and management agencies.

Explore further: Australia getting hotter and drier

Related Stories

Australia getting hotter and drier

October 2, 2007

A new climate change study in Australia predicted the country will be 5 degree Celsius hotter and 40-80 percent drier by the year 2070.

Study indicates changing climate in the Australian South-East

October 25, 2010

Despite recent rainfall in parts of eastern Australia, a recently released scientific report indicates an increasing risk of below-average rainfall and runoff into streams, and drier conditions into the future in south-eastern ...

Future fire -- still a wide open climate question

July 7, 2011

How the frequency and intensity of wildfires and intentional biomass burning will change in a future climate requires closer scientific attention, according to CSIRO's Dr Melita Keywood.

Plants protect from climate impacts

August 2, 2011

Native vegetation must be restored to protect Australia’s unique ecosystems from the impacts of climate change, according to scientists from the Australian National University.

Recommended for you

Climate scientist hits out at IPCC projections

October 13, 2015

As a new chairman is appointed to the Intergovernmental Panel on climate Change (IPCC) a University of Manchester climate expert has said headline projections from the organisation about future warming are 'wildly over optimistic.'

'Bridge' fuel may escalate atmospheric greenhouse gas

October 13, 2015

While the U.S. Environmental Protection Agency (EPA) suggests there has been a decline in measurable atmospheric greenhouse gas emissions from fossil fuel use in the U.S. for the past seven years, a Cornell scientist says ...

Study sees powerful winds carving away Antarctic snow

October 13, 2015

A new study has found that powerful winds are removing massive amounts of snow from parts of Antarctica, potentially boosting estimates of how much the continent might contribute to sea level. Up to now, scientists had thought ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.