Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/47465
Title: Disentangling the formation of contrasting tree line physiognomies combining model selection and Bayesian parameterization for simulation models.
Author: Martínez-Cano, I.
Wiegand, T.
Camarero Martínez, Jesús Julio
Batllori Presas, Enric
Gutiérrez Merino, Emilia
Keywords: Boscos
Pins
Pirineus
Forests
Pine
Pyrenees
Issue Date: May-2011
Publisher: University of Chicago Press
Abstract: Alpine tree-line ecotones are characterized by marked changes at small spatial scales that may result in a variety of physiognomies. A set of alternative individual-based models was tested with data from four contrasting Pinus uncinata ecotones in the central Spanish Pyrenees to reveal the minimal subset of processes required for tree-line formation. A Bayesian approach combined with Markov chain Monte Carlo methods was employed to obtain the posterior distribution of model parameters, allowing the use of model selection procedures. The main features of real tree lines emerged only in models considering nonlinear responses in individual rates of growth or mortality with respect to the altitudinal gradient. Variation in tree-line physiognomy reflected mainly changes in the relative importance of these nonlinear responses, while other processes, such as dispersal limitation and facilitation, played a secondary role. Different nonlinear responses also determined the presence or absence of krummholz, in agreement with recent findings highlighting a different response of diffuse and abrupt or krummholz tree lines to climate change. The method presented here can be widely applied in individual-based simulation models and will turn model selection and evaluation in this type of models into a more transparent, effective, and efficient exercise.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1086/659623
It is part of: American Naturalist, 2011, vol. 177, num. 5, p. 136-152
Related resource: http://dx.doi.org/10.1086/659623
URI: http://hdl.handle.net/2445/47465
ISSN: 0003-0147
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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