EllisHubbellPotvin2000

Référence

Ellis, A.R., Hubbell, S.P., Potvin, C. (2000) In situ field measurements of photosynthetic rates of tropical tree species: A test of the functional group hypothesis. Canadian Journal of Botany, 78(10):1336-1347.

Résumé

We examined photosynthetic characteristics of 21 tree species from a Panamanian forest differing in successional status. We hypothesized that functional guilds of species, grouped by successional status, would differ in photosynthetic performance and that pioneers would be more sensitive to seasonality and more variable in response to light than intermediate or shade tolerants. Steady-state leaf-level photosynthesis (A) was measured in situ on eight trees per species. Light response curves were generated by fitting a hyperbolic model to these data. Average light saturated photosynthetic rates (Amax) were then calculated for each species. Variability of light, photosynthesis, and leaf characteristics were quantified using coefficients of variation (CV). Significant differences were detected among species and functional groups for A. Amax and leaf N concentration. Functional group explained 46% of the observed variation in A. Pioneers exhibited higher light-saturated photosynthetic rates than intermediates: both were higher than shade tolerants. Intermediates were the most seasonally plastic group and had the highest leaf N concentration. Shade tolerants were found in lower, more variable light environments than pioneers. A strong positive correlation between diameter growth rate and photosynthetic rate (r2 = 0.55, p = 0.004) was observed across species. Our results tend to confirm the hypothesis that physiological traits can be used to differentiate among functional groups of plants. However, no evidence was found for higher plasticity of pioneer compared with shade-tolerant species.

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@ARTICLE { EllisHubbellPotvin2000,
    AUTHOR = { Ellis, A.R. and Hubbell, S.P. and Potvin, C. },
    TITLE = { In situ field measurements of photosynthetic rates of tropical tree species: A test of the functional group hypothesis },
    JOURNAL = { Canadian Journal of Botany },
    YEAR = { 2000 },
    VOLUME = { 78 },
    PAGES = { 1336-1347 },
    NUMBER = { 10 },
    NOTE = { 00084026 (ISSN) Cited By (since 1996): 10 Export Date: 26 April 2007 Source: Scopus CODEN: CJBOA doi: 10.1139/cjb-78-10-1336 Language of Original Document: English Correspondence Address: Ellis, A.R.; Department of Biology; McGill University; 1205 Docteur Penfield Avenue Montre?al, Que. H3A 1B1, Canada; email: czcp@musica.mcgill.ca References: (1994) StatView, version 4.5, , Abacus Concepts, Inc., Berkeley, Calif; Abrams, M.D., Mostoller, S.A., Gas exchange, leaf structure and nitrogen in contrasting successional tree species growing in open and understory sites during a drought (1995) Tree Physiol., 15, pp. 361-370; Bawa, K.S., Markham, A., Climate change and tropical forests (1995) Trends Ecol. Evol., 10, pp. 348-349; Bazzaz, F.A., Pickett, S.T.A., Physiological ecology of tropical succession: A comparative review (1980) Annu. Rev. Ecol. 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    ABSTRACT = { We examined photosynthetic characteristics of 21 tree species from a Panamanian forest differing in successional status. We hypothesized that functional guilds of species, grouped by successional status, would differ in photosynthetic performance and that pioneers would be more sensitive to seasonality and more variable in response to light than intermediate or shade tolerants. Steady-state leaf-level photosynthesis (A) was measured in situ on eight trees per species. Light response curves were generated by fitting a hyperbolic model to these data. Average light saturated photosynthetic rates (Amax) were then calculated for each species. Variability of light, photosynthesis, and leaf characteristics were quantified using coefficients of variation (CV). Significant differences were detected among species and functional groups for A. Amax and leaf N concentration. Functional group explained 46% of the observed variation in A. Pioneers exhibited higher light-saturated photosynthetic rates than intermediates: both were higher than shade tolerants. Intermediates were the most seasonally plastic group and had the highest leaf N concentration. Shade tolerants were found in lower, more variable light environments than pioneers. A strong positive correlation between diameter growth rate and photosynthetic rate (r2 = 0.55, p = 0.004) was observed across species. Our results tend to confirm the hypothesis that physiological traits can be used to differentiate among functional groups of plants. However, no evidence was found for higher plasticity of pioneer compared with shade-tolerant species. },
    KEYWORDS = { Growth Nitrogen Photosynthesis Physiological plasticity Tropical succession Tropical trees photosynthesis functional group in situ measurement light intensity photosynthesis seasonality tropical forest Panama },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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