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Leaf turgor loss point shapes local and regional distributions of evergreen but not deciduous tropical trees

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.17187· OSTI ID:1765387
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [4];  [4];  [2];  [6];  [7]
  1. Conservation Ecology Center Smithsonian Conservation Biology Institute Front Royal VA 22630 USA, Forest Global Earth Observatory Smithsonian Tropical Research Institute Panama Republic of Panama, Department of Integrative Biology and Biodiversity Research Institute of Botany University of Natural Resources and Life Sciences Gregor‐Mendel Str. 33 Vienna A‐1190 Austria
  2. Department of Ecology and Evolution University of California Los Angeles 621 Charles E. Young Drive South Los Angeles CA 90095 USA
  3. Conservation Ecology Center Smithsonian Conservation Biology Institute Front Royal VA 22630 USA
  4. Smithsonian Tropical Research Institute PO Box 084303092 Balboa, Ancón Republic of Panama
  5. Forest Global Earth Observatory Smithsonian Tropical Research Institute Panama Republic of Panama, Smithsonian Environmental Research Center Edgewater MD 21307 USA
  6. Forest Global Earth Observatory Smithsonian Tropical Research Institute PO Box 37012 Washington DC 20013 USA
  7. Conservation Ecology Center Smithsonian Conservation Biology Institute Front Royal VA 22630 USA, Forest Global Earth Observatory Smithsonian Tropical Research Institute Panama Republic of Panama
Summary

The effects of climate change on tropical forests will depend on how diverse tropical tree species respond to drought. Current distributions of evergreen and deciduous tree species across local and regional moisture gradients reflect their ability to tolerate drought stress, and might be explained by functional traits.

We measured leaf water potential at turgor loss (i.e. ‘wilting point’; π tlp ), wood density (WD) and leaf mass per area (LMA) on 50 of the most abundant tree species in central Panama. We then tested their ability to explain distributions of evergreen and deciduous species within a 50 ha plot on Barro Colorado Island and across a 70 km rainfall gradient spanning the Isthmus of Panama.

Among evergreen trees, species with lower π tlp were associated with drier habitats, with π tlp explaining 28% and 32% of habitat association on local and regional scales, respectively, greatly exceeding the predictive power of WD and LMA. In contrast, π tlp did not predict habitat associations among deciduous species.

Across spatial scales, π tlp is a useful indicator of habitat preference for tropical tree species that retain their leaves during periods of water stress, and holds the potential to predict vegetation responses to climate change.

Research Organization:
Next Generation Ecosystem Experiments-Tropics (Puerto Rico) (Brazil) (Malaysia) (Australia) (French Guiana)
Sponsoring Organization:
Smithsonian Forest Global Earth Observatory (ForestGEO); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI ID:
1765387
Alternate ID(s):
OSTI ID: 1817041
OSTI ID: 1778429
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 2 Vol. 230; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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