Convergent evolution of tree hydraulic traits in Amazonian habitats: implications for community assemblage and vulnerability to drought
Abstract
Amazonian droughts are increasing in frequency and severity. However, little is known about how this may influence species-specific vulnerability to drought across different ecosystem types. We measured 16 functional traits for 16 congeneric species from six families and eight genera restricted to floodplain, swamp, white-sand or plateau forests of Central Amazonia. We investigated whether habitat distributions can be explained by species hydraulic strategies, and if habitat specialists differ in their vulnerability to embolism that would make water transport difficult during drought periods. We found strong functional differences among species. Nonflooded species had higher wood specific gravity and lower stomatal density, whereas flooded species had wider vessels, and higher leaf and xylem hydraulic conductivity. The P50 values (water potential at 50% loss of hydraulic conductivity) of nonflooded species were significantly more negative than flooded species. However, we found no differences in hydraulic safety margin among species, suggesting that all trees may be equally likely to experience hydraulic failure during severe droughts. Water availability imposes a strong selection leading to differentiation of plant hydraulic strategies among species and may underlie patterns of adaptive radiation in many tropical tree genera. Our results have important implications for modeling species distribution and resilience under futuremore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States); Univ. of Minnesota, St. Paul, MN (United States)
- Univ. of California, Berkeley, CA (United States)
- Karlsruhe Inst. of Technology (KIT) (Germany); Max Planck Society, Mainz (Germany). Max Planck Inst. for Chemistry
- Univ. of Exeter, Devon (United Kingdom)
- National Institute of Amazonian Research, Manaus (Brazil)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); Science Without Boarders Program
- OSTI Identifier:
- 1844920
- Grant/Contract Number:
- AC02-05CH11231; 99999.001262/2013-00
- Resource Type:
- Accepted Manuscript
- Journal Name:
- New Phytologist
- Additional Journal Information:
- Journal Volume: 228; Journal Issue: 1; Journal ID: ISSN 0028-646X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Fontes, Clarissa G., Fine, Paul A., Wittmann, Florian, Bittencourt, Paulo L., Piedade, Maria Fernandez, Higuchi, Niro, Chambers, Jeffrey Q., and Dawson, Todd E. Convergent evolution of tree hydraulic traits in Amazonian habitats: implications for community assemblage and vulnerability to drought. United States: N. p., 2020.
Web. doi:10.1111/nph.16675.
Fontes, Clarissa G., Fine, Paul A., Wittmann, Florian, Bittencourt, Paulo L., Piedade, Maria Fernandez, Higuchi, Niro, Chambers, Jeffrey Q., & Dawson, Todd E. Convergent evolution of tree hydraulic traits in Amazonian habitats: implications for community assemblage and vulnerability to drought. United States. https://doi.org/10.1111/nph.16675
Fontes, Clarissa G., Fine, Paul A., Wittmann, Florian, Bittencourt, Paulo L., Piedade, Maria Fernandez, Higuchi, Niro, Chambers, Jeffrey Q., and Dawson, Todd E. Tue .
"Convergent evolution of tree hydraulic traits in Amazonian habitats: implications for community assemblage and vulnerability to drought". United States. https://doi.org/10.1111/nph.16675. https://www.osti.gov/servlets/purl/1844920.
@article{osti_1844920,
title = {Convergent evolution of tree hydraulic traits in Amazonian habitats: implications for community assemblage and vulnerability to drought},
author = {Fontes, Clarissa G. and Fine, Paul A. and Wittmann, Florian and Bittencourt, Paulo L. and Piedade, Maria Fernandez and Higuchi, Niro and Chambers, Jeffrey Q. and Dawson, Todd E.},
abstractNote = {Amazonian droughts are increasing in frequency and severity. However, little is known about how this may influence species-specific vulnerability to drought across different ecosystem types. We measured 16 functional traits for 16 congeneric species from six families and eight genera restricted to floodplain, swamp, white-sand or plateau forests of Central Amazonia. We investigated whether habitat distributions can be explained by species hydraulic strategies, and if habitat specialists differ in their vulnerability to embolism that would make water transport difficult during drought periods. We found strong functional differences among species. Nonflooded species had higher wood specific gravity and lower stomatal density, whereas flooded species had wider vessels, and higher leaf and xylem hydraulic conductivity. The P50 values (water potential at 50% loss of hydraulic conductivity) of nonflooded species were significantly more negative than flooded species. However, we found no differences in hydraulic safety margin among species, suggesting that all trees may be equally likely to experience hydraulic failure during severe droughts. Water availability imposes a strong selection leading to differentiation of plant hydraulic strategies among species and may underlie patterns of adaptive radiation in many tropical tree genera. Our results have important implications for modeling species distribution and resilience under future climate scenarios.},
doi = {10.1111/nph.16675},
journal = {New Phytologist},
number = 1,
volume = 228,
place = {United States},
year = {Tue May 26 00:00:00 EDT 2020},
month = {Tue May 26 00:00:00 EDT 2020}
}
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