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Abstract:

1. Leaf structural and physiological traits are associated with growth form and habitat, but little is known of the specific traits associated with hemiepiphytes, which are an important component of many tropical forests. Given their life history that includes a drought prone epiphytic stage, hemiepiphytes should be expected to have more drought tolerance-related traits than co-occurring terrestrial species. 2. The genus Ficus includes woody hemiepiphytes distributed in tropical areas throughout the world. Traits related to the flux of water through the leaf and to drought adaptations were studied in five hemiephiphytic (H) and five non-hemiepiphytic (NH) Ficus tree species grown in a common garden to determine genetically based differences. 3. Leaves of H and NH species differed substantially in structure and physiology; on average, H species had smaller leaves with higher leaf mass per unit area, thicker epidermis, smaller vessel lumen diameters in petioles and lower petiole hydraulic conductivity. Leaf traits also indicated stronger drought tolerance in H species, including lower epidermal conductance and turgor loss point and earlier stomatal closure with desiccation than NH species. Across H and NH species, traits related to water flux capacity were negatively correlated with traits related to drought tolerance. 4. The divergences in hydraulics and water relations between growth forms for these closely related species reflected specialization according to contrasting habitat and life form. Conservative water use and increased ability of leaves to persist under severe drought would provide an advantage for H species, especially during the epiphytic phase, while the higher potential water use of NH species would be associated with higher assimilation rates and competitiveness under high water supply. 5. The results indicate a trade-off between leaf water flux capacity and leaf drought tolerance across these hemiephiphytic and non-hemiepiphytic species. Species adaptation to habitats with contrasting demands on leaf function may lead to divergence along a leaf water-flux-drought-tolerance spectrum. © 2010 The Authors. Journal compilation © 2010 British Ecological Society.

Registro:

Documento: Artículo
Título:Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
Autor:Hao, G.-Y.; Sack, L.; Wang, A.-Y.; Cao, K.-F.; Goldstein, G.
Filiación:Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan Province 666303, China
Department of Biology, University of Miami, Coral Gables, FL 33124, United States
Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA 90095, United States
Department of Biology, Simao Teachers' College, Pu'er, Yunnan Province 665000, China
Laboratorio de Ecología Funcional, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Nuñez, Buenos Aires, Argentina
Palabras clave:Leaf hydraulics; Rainforest; Stomatal control; Water relations; desiccation; dicotyledon; divergence; drought resistance; ecophysiology; epiphyte; growth form; leaf; life history; stomatal conductance; tropical forest; water flow; water relations; water use
Año:2010
Volumen:24
Número:4
Página de inicio:731
Página de fin:740
DOI: http://dx.doi.org/10.1111/j.1365-2435.2010.01724.x
Título revista:Functional Ecology
Título revista abreviado:Funct. Ecol.
ISSN:02698463
CODEN:FECOE
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_02698463_v24_n4_p731_Hao.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02698463_v24_n4_p731_Hao

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Citas:

---------- APA ----------
Hao, G.-Y., Sack, L., Wang, A.-Y., Cao, K.-F. & Goldstein, G. (2010) . Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species. Functional Ecology, 24(4), 731-740.
http://dx.doi.org/10.1111/j.1365-2435.2010.01724.x
---------- CHICAGO ----------
Hao, G.-Y., Sack, L., Wang, A.-Y., Cao, K.-F., Goldstein, G. "Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species" . Functional Ecology 24, no. 4 (2010) : 731-740.
http://dx.doi.org/10.1111/j.1365-2435.2010.01724.x
---------- MLA ----------
Hao, G.-Y., Sack, L., Wang, A.-Y., Cao, K.-F., Goldstein, G. "Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species" . Functional Ecology, vol. 24, no. 4, 2010, pp. 731-740.
http://dx.doi.org/10.1111/j.1365-2435.2010.01724.x
---------- VANCOUVER ----------
Hao, G.-Y., Sack, L., Wang, A.-Y., Cao, K.-F., Goldstein, G. Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species. Funct. Ecol. 2010;24(4):731-740.
http://dx.doi.org/10.1111/j.1365-2435.2010.01724.x