Isoprene emission structures tropical tree biogeography and community assembly responses to climate

. 2018 Oct ; 220 (2) : 435-446. [epub] 20180704

Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic

Typ dokumentu časopisecké články, práce podpořená grantem, Research Support, U.S. Gov't, Non-P.H.S.

Perzistentní odkaz   https://www.medvik.cz/link/pmid29974469

Grantová podpora
OISE-0730305 NSF-PIRE - International
3002937712 USDOE - International
NNX17AF65G National Aeronautics and Space Administration - United States
NNX14AK95H National Aeronautics and Space Administration - United States
University of AZ Agnes Nelms Haury Program in Environment and Social Justice - International
StG-2014-639706-CONSTRAINTS ERC - International CEP - Centrální evidence projektů
16-26369S Grant Agency of the Czech Republic - International
N006852/1 NERC - International
DP170104091 Ames Research Center NASA - United States

The prediction of vegetation responses to climate requires a knowledge of how climate-sensitive plant traits mediate not only the responses of individual plants, but also shifts in the species and functional compositions of whole communities. The emission of isoprene gas - a trait shared by one-third of tree species - is known to protect leaf biochemistry under climatic stress. Here, we test the hypothesis that isoprene emission shapes tree species compositions in tropical forests by enhancing the tolerance of emitting trees to heat and drought. Using forest inventory data, we estimated the proportional abundance of isoprene-emitting trees (pIE) at 103 lowland tropical sites. We also quantified the temporal composition shifts in three tropical forests - two natural and one artificial - subjected to either anomalous warming or drought. Across the landscape, pIE increased with site mean annual temperature, but decreased with dry season length. Through time, pIE strongly increased under high temperatures, and moderately increased following drought. Our analysis shows that isoprene emission is a key plant trait determining species responses to climate. For species adapted to seasonal dry periods, isoprene emission may tradeoff with alternative strategies, such as leaf deciduousness. Community selection for isoprene-emitting species is a potential mechanism for enhanced forest resilience to climatic change.

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