# Drought Vulnerability of Neotropical Canopy Trees and Lianas

Louis Santiago, Aleyda Acosta-Rangel, Christopher Baraloto, Damien Bonal

► To cite this version:

Louis Santiago, Aleyda Acosta-Rangel, Christopher Baraloto, Damien Bonal. Drought Vulnerability of Neotropical Canopy Trees and Lianas. 54. Annual Meeting of the Association of Tropical Biology and Conversation. ATBC 2017, Jul 2017, Merida, Mexico. 471 p. hal-02735824

HAL Id: hal-02735824

https://hal.inrae.fr/hal-02735824v1

Submitted on 2 Jun 2020

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# Drought Vulnerability of Neotropical Canopy Trees and Lianas

Louis Santiago, Mark De Guzman, Aleyda Acosta-Rangel, Christopher Baraloto Damien Bonal

University of California, Riverside
Smithsonian Tropical Research Institute
Florida International University
UMR EEF - INRA

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Functional diversity and responses to drought in tropical forests (DROUGHT)

Damien Bonal, Nicolas Angeli, Pascale Maillard, Christian Hossann, Sabrina Coste, Jean-Yves Goret, Benoit Burban, Jocelyn Cazal, Heidy Schimann, Elaine Louisanna, Maricar Aguilos, Patrick Heuret, Bruno Herault, Camille Ziegler, Maguy Dulormne, Celine Leroy, Nathalie Sejalon-Delman, Marc Buee, Cyrille Bach, Melanie Roy, Sophie Manzi, Isabelle Marechaux, Jerome Chave, Elodie Courtois, Clement Stahl, Erik Verbruggen, Ivan Janssens, Hans Verbeeck, Elizabeth Kearsley, Hannes De Deurwaerder, Louis Santiago, Mark De Guzman, Chris Baraloto, Ken Feeley, Oscar Valverde, Lucy Rowland, Patrick Meir, Herve Cochard, Corinne Vacher, Celine LaLanne, Patrick Leger, Sylvain Delzon, Regis Burlett, Gaelle CapDeVille, Laurant Lamarque, Jose Torres, Nathan Mcdowell, Charlotte Grossiord, Lawren Sack, Megan Bartlett

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# Panama Canopy Cranes

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Question 1:

> Does the magnitude of hydraulic trait differences in trees and lianas vary with precipitation?
Lianas appear to lose their advantage as annual precipitation increases

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Cai, Schnitzer & Bongers (2009)
1550 mm yr-1 precipitation

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Santiago & Wright (2007)
3100 mm yr-1 precipitation
Vulnerability to drought-induced xylem cavitation
"vulnerability curve"

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Differences in *Ks* are greater in drier forests

<figure><img src="image_14.png" /><figcaption>Parque Metropolitano Crane
1800 mm yr-1</figcaption></figure>

De Guzman, Santiago, Schnitzer, Álvarez-Cansino
(2016) Tree Physiology

<figure><img src="image_15.png" /><figcaption>San Lorenzo Crane
3100 mm yr-1</figcaption></figure>

De Guzman, Acosta-Rangel, Winter,
Bonal, Santiago (unpublished)
Differences in P50 are greater in drier forests

<figure><img src="image_16.png" /><figcaption>Parque Metropolitano Crane
1800 mm yr-1</figcaption></figure>

De Guzman, Santiago, Schnitzer, Álvarez-Cansino
(2016) Tree Physiology

<figure><img src="image_17.png" /><figcaption>San Lorenzo Crane
3100 mm yr-1</figcaption></figure>

De Guzman, Acosta-Rangel, Winter,
Bonal, Santiago (unpublished)
Question 2:

> Does the hydraulic safety versus efficiency trade-off apply to lianas?
# The hydraulic safety versus efficiency trade-off

More efficient
water transport

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Efficiency: maximal xylem-specific conductivity ($K_s$, kg m⁻¹ s⁻¹ MPa⁻¹)

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Feature 1: embolism resistance and high efficiency. All species should evolve to fill this space, if it were possible.

Feature 3: tradeoff created by linkage between efficiency and safety. All species are predicted to occupy this zone.

Feature 2: low efficiency and low safety – these species would be non-competitive and should be selected against.

Safety: embolism resistance ($P_{50}$, -MPa)

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Safer xylem;
more resistant
# The hydraulic safety versus efficiency trade-off

More efficient
water transport

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Lianas show stronger safety-efficiency trade-off than trees

Trees

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Lianas

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De Guzman, Santiago, Schnitzer, Álvarez-Cansino, Acosta-Rangel, Winter, Bonal, Baraloto, et al.
*(Tree Physiology (2016) and unpublished data)*
Question 3:

> Coordination with drought avoidance traits?
Stem pressure-volume curve: Drought avoidance traits

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Expected linkages among hydraulic traits

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Evidence of safety-avoidance coordination in lianas – trees no
No evidence of efficiency-avoidance trade-off

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De Guzman, Santiago, Acosta-Rangel, Winter, Bonal, (unpublished data)
Evidence of safety-avoidance coordination in lianas – trees no
No evidence of efficiency-avoidance trade-off

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De Guzman, Santiago, Acosta-Rangel, Winter, Bonal, (unpublished data)
Evidence of safety-avoidance coordination in lianas – trees no
No evidence of efficiency-avoidance trade-off

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De Guzman, Santiago, Acosta-Rangel, Winter, Bonal, (unpublished data)
Expected linkages among hydraulic traits

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Expected linkages among hydraulic traits

<figure><img src="image_33.png" /></figure>
Expected linkages among hydraulic traits

<figure><img src="image_34.png" /></figure>
Expected linkages among hydraulic traits

<figure><img src="image_35.png" /></figure>
Questions:

> Does the magnitude of hydraulic trait differences in trees and lianas vary with precipitation?

> Does the hydraulic safety versus efficiency trade-off apply to lianas?

> Coordination with drought avoidance traits?
Questions:

> Does the magnitude of hydraulic trait differences in trees and lianas vary with precipitation?

<figure><img src="image_36.png" /></figure>

> Does the hydraulic safety versus efficiency trade-off apply to lianas?

> Coordination with drought avoidance traits?
Questions:

> Does the magnitude of hydraulic trait differences in trees and lianas vary with precipitation?

<figure><img src="image_37.png" /></figure>

> Does the hydraulic safety versus efficiency trade-off apply to lianas?

<figure><img src="image_38.png" /></figure>

> Coordination with drought avoidance traits?
Questions:

> Does the magnitude of hydraulic trait differences in trees and lianas vary with precipitation? ✓

> Does the hydraulic safety versus efficiency trade-off apply to lianas? ✓

> Coordination with drought avoidance traits? ✗
Thank you!

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