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Acclimation of seedlings of three Mexican tropical rain forest tree species to a change in light availability

Published online by Cambridge University Press:  10 July 2009

J. Popma  and
F. Bongers
J. Popma*
Affiliation:
Department of Plant Ecology, University of Utrecht, Lange Nieuwslraat 106, 3512 PN Utrecht, The Netherlands Laboratorio de Ecología, Facultad de Ciencias, Universidad National Autónoma de México, 04510 México DF, México
F. Bongers
Affiliation:
Department of Plant Ecology, University of Utrecht, Lange Nieuwslraat 106, 3512 PN Utrecht, The Netherlands Laboratorio de Ecología, Facultad de Ciencias, Universidad National Autónoma de México, 04510 México DF, México
*
*Correspondence should be sent to J. Popma, Nijmegen.
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Abstract

A comparison is made of the light acclimation potential of seedlings of three canopy species of the tropical rain forest of Los Tuxtlas, Mexico: Cordia megalantha, Lonchocarpus guatemalensis, and Omphalea oleifera. These species showed similar growth rates in a range of microhabitats. Gap dynamics were simulated by transferring plants between three environments: beneath a closed canopy, a small gap, and a large gap. Plants of all three species were able to adjust their morphology and growth rates in response to changes in light availability. Growth rates increased when plants were moved to a (larger) gap, and decreased when plants were moved to a more shaded environment. Shade-grown plants were able to acclimate faster to increasing light availability than sun-grown plants to decreasing light availability. Also, plants moved from shady to sunny conditions showed higher relative growth rates than sun control plants, whereas sun-grown plants when moved to the shade showed lower relative growth rates than shade control plants. Species differed in their response to gap dynamics. Omphalea could not acclimate morphologically to shading, but reacted faster than the other species in response to the occurrence of a large gap. Acclimation potential seemed to be related to plasticity in physiological rather than in morphological traits. Suppressed seedlings of all three species performed well in the shade, and were able to acclimate rapidly to gap-conditions.

Keywords

acclimationbiomass allocationCordia megalanlhagrowthLonchocarpus guatemalensisLos TuxtlasMexicomorphologyOmphalea oleiferatreefall gapstree seedlingstropical rain forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 7 , Issue 1 , February 1991 , pp. 85 - 97
Copyright
Copyright © Cambridge University Press 1991

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