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Updated 15 December 2006

OUR CHANGING PLANET
The U.S. Climate Change Science Program
for Fiscal Year 2007

A Report by the Climate Change Science Program and
The Subcommittee on Global Change Research
A Supplement to the President's Fiscal Year 2007 Budget

Figure 38.  Summer Maximum Temperature and the Abundance of Collema.

OCP07-Fig-37

A negative correlation existed between summer maximum temperature (mean daily maximum temperature during June) and subsequent abundance of the lichen Collema, which dominates the biological soil crust in many semi-arid western ecosystems. Even after 2 cooler years, the lichen had not recovered from the warm period of 1997 to 2003. Credit: J. Belnap, S.L. Phillips, and T.T. Troxler, U.S. Geological Survey.

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