The climate in southwestern Australia has been drying for more than 40 years. Residents there are bracing for a continuing drier and warmer trend, according to scientists at the Curtin University Institute for Biodiversity and Climate in Australia. Scientists at that institute have been working on a method to identify potential refugia – that is, areas in which a population of organisms can survive through a period of unfavorable conditions – as rainfall continues to decline in southwestern Australia. They say their newest results – which involved the use of Light Detection And Ranging (LiDAR) instruments – are encouraging. The journal PLOS One published the work in early January 2014.
Grant Wardell-Johnson and Gunnar Keppel, along with former Curtin scientist Tom Schut (now at Wageningen University in the Netherlands) were able to translate a traditional plot observation to an entire landscape. The key, the team said, was finding a strong relationship between three things: vegetation types in southwestern Australa, soil depth and rainfall.
They say their finding means they can now compare current climate and future climates under a continuing trend of reduced rainfall in the region.
In turn, Wardell-Johnson said, this comparison will let them apply expected future changes in rainfall to landscape-scale vegetation and, thereby, find potential sites where populations of organisms could survive.
They say these findings are “essential for conservation efforts.” Wardell-Johnson added:
Global warming is a particular issue in Mediterranean-climate regions. It is especially so in the flat landscapes of south-western Australia – home to a global biodiversity hotspot.
Understanding where refugia will be is of particular importance in light of human-caused global warming, to offer the best chances for our precious flora and fauna in times of transformative change.
Bottom line: Australian scientists are making headway in learning how to predict future safe havens for biodiversity, as climate changes. In particular, they are looking at a technique that will let them apply expected future expected changes in rainfall to landscape-scale vegetation and, thereby, find potential sites where populations of organisms can survive.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.