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species."</title></head><body>
<div><font face="Geneva" color="#000000">"</font><font
face="Geneva" color="#141413">Here, we examine the physiological basis
of a recent multiyear widespread die-off of trembling aspen (Populus
tremuloides) across much of western North America. Using observations
from both native trees while they are dying and a rainfall exclusion
experiment on mature trees, we measure hydraulic performance over
multiple seasons and years and assess pathways of accumulated
hydraulic damage</font><font face="Geneva"
color="#000000">."</font></div>
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<div><font face="Geneva" color="#000000">"Contrary to the
expectation that surviving trees have weathered severe drought, the
hydraulic deterioration demonstrated here reveals that surviving
regions of these forests are actually more vulnerable to future
droughts due to accumulated xylem damage. As the most widespread tree
species in North America, increasing vulnerability to drought in these
forests has important ramifications ....
"</font></div>
<div><font face="Geneva" color="#000000"><br></font></div>
<div><font face="Geneva" color="#000000">William L. R. Anderegg et al.
Drought's legacy: multiyear hydraulic deterioration underlies
widespread aspen forest die-off and portends increased future
risk. </font></div>
<div><font face="Geneva" color="#000000"><i>Global Change Biology</i>
(2013) 19, 1188-1196, doi: 10.1111/gcb.12100</font></div>
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