VileShipleyGarnier2006

Référence

Vile, D., Shipley, B. and Garnier, E. (2006) A structural equation model to integrate changes in functional strategies during old-field succession. Ecology, 87(2):504-517.

Résumé

From a functional perspective, changes in abundance, and ultimately species replacement, during succession are a consequence of integrated suites of traits conferring different relative ecological advantages as the environment changes over time. Here we use structural equations to model the interspecific relationships between these integrated functional traits using 34 herbaceous species from a Mediterranean old-field succession and thus quantify the notion of a plant strategy. We measured plant traits related to plant vegetative and reproductive size, leaf functioning, reproductive phenology, seed mass, and production on 15 individuals per species monitored during one growing season. The resulting structural equation model successfully accounts for the pattern of trait covariation during the first 45 years post-abandonment using just two forcing variables: time since site abandonment and seed mass; no association between time since field abandonment and seed mass was observed over these herbaceous stages of secondary succession. All other predicted traits values are determined by these two variables and the cause-effect linkage between them. Adding pre-reproductive vegetative mass as a third forcing variable noticeably increased the predictive power of the model. Increasing the time after abandonment favors species with increasing life span and pre-reproductive biomass and decreasing specific leaf area. Allometric coefficients relating vegetative and reproductive components of plant size were in accordance with allometry theory. The model confirmed the trade-off between seed mass and seed number. Maximum plant height and seed mass were major determinants of reproductive phenology. Our results show that beyond verbal conceptualization, plant ecological strategies can be quantified and modeled. © 2006 by the Ecological Society of America.

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@ARTICLE { VileShipleyGarnier2006,
    AUTHOR = { Vile, D. and Shipley, B. and Garnier, E. },
    TITLE = { A structural equation model to integrate changes in functional strategies during old-field succession },
    JOURNAL = { Ecology },
    YEAR = { 2006 },
    VOLUME = { 87 },
    PAGES = { 504-517 },
    NUMBER = { 2 },
    NOTE = { 00129658 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus CODEN: ECOLA Language of Original Document: English Correspondence Address: Vile, D.; Centre d'Ecologie Fonctionnelle et Evolutive (U.M.R. 5175); Centre National de la Recherche Scientifique; 1919, Route de Mende 34293 Montpellier Cedex 5, France; email: denis.vile@cefe.cnrs.fr References: Aarssen, L.W., Jordan, C.Y., Between-species patterns of covariation in plant size, seed size and fecundity in monocarpic herbs (2001) Ecoscience, 8, pp. 471-477; Aarssen, L.W., Taylor, D.R., Fecundity allocation in herbaceous plants (1992) Oikos, 65, pp. 225-232; Abrahamson, W.G., Patterns of resource allocation in wildflower populations of field and woods (1979) American Journal of Botany, 66, pp. 71-79; Ackerly, D., Functional strategies of chaparral shrubs in relation to seasonal water deficit and disturbance (2004) Ecological Monographs, 74, pp. 25-44; Aerts, R., Chapin, F.S., The mineral nutrition of wild plants revisited: A re-evaluation of processes and patterns (2000) Advances in Ecological Research, 30, pp. 1-67; Baker, H.G., Seed weight in relation to environmental conditions in California (1972) Ecology, 53, pp. 997-1010; Bazzaz, F.A., Physiological ecology of plant succession (1979) Annual Reviews of Ecology and Systematics, 10, pp. 351-371; Bazzaz, F.A., (1996) Plants in Changing Environment: Linking Physiological, Population, and Community Ecology, , Cambridge University Press, Cambridge, UK; Bazzaz, F.A., Ackerly, D.D., Reekie, E.G., Reproductive allocation in plants (2000) Seeds: The Ecology of Regeneration in Plant Communities, pp. 1-29. , M. 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    ABSTRACT = { From a functional perspective, changes in abundance, and ultimately species replacement, during succession are a consequence of integrated suites of traits conferring different relative ecological advantages as the environment changes over time. Here we use structural equations to model the interspecific relationships between these integrated functional traits using 34 herbaceous species from a Mediterranean old-field succession and thus quantify the notion of a plant strategy. We measured plant traits related to plant vegetative and reproductive size, leaf functioning, reproductive phenology, seed mass, and production on 15 individuals per species monitored during one growing season. The resulting structural equation model successfully accounts for the pattern of trait covariation during the first 45 years post-abandonment using just two forcing variables: time since site abandonment and seed mass; no association between time since field abandonment and seed mass was observed over these herbaceous stages of secondary succession. All other predicted traits values are determined by these two variables and the cause-effect linkage between them. Adding pre-reproductive vegetative mass as a third forcing variable noticeably increased the predictive power of the model. Increasing the time after abandonment favors species with increasing life span and pre-reproductive biomass and decreasing specific leaf area. Allometric coefficients relating vegetative and reproductive components of plant size were in accordance with allometry theory. The model confirmed the trade-off between seed mass and seed number. Maximum plant height and seed mass were major determinants of reproductive phenology. Our results show that beyond verbal conceptualization, plant ecological strategies can be quantified and modeled. © 2006 by the Ecological Society of America. },
    KEYWORDS = { Allometry Path analysis Phenology Plant size Reproductive allocation Secondary succession Seed mass Seed production Structural equation modeling },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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