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Title of article :
Variation in performance of the tree fern Cyathea caracasana (Cyatheaceae) across a successional mosaic in an Andean cloud forest
Author/Authors :
Arens، Nan Crystal نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2001
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Abstract :
In Andean forests, Cyathea caracasana grows across a range of successional habitats. This study documents variation in several measures of plant performance (stem growth, leaf production, leaf longevity, and spore production) in C. caracasana growing in open habitat, low-canopy secondary forest, and high-canopy secondary forest, based on 33 mo of observation. In open habitat, C. caracasana displayed significantly higher growth rates, leaf production rates, and leaf turnover than in either of the forested habitats. The highest rates of spore production were also observed in openhabitat individuals, with only one plant in the forest understory producing spores during the study. Despite low growth and no reproduction, I observed no mortality among ferns in the forest understory. These data show that C. caracasana performs best under conditions of full sun but can persist under the closed canopy. This suggests a life history in which periods of rapid growth, spore production, and recruitment in forest gaps alternate with low growth rate and persistence in the understory. A phylogenetic perspective suggests that the habitat flexibility, which might conventionally mark C. caracasana as a habitat generalist, is better interpreted as specialization for the dynamic forest in which it grows.
Keywords :
drought stress , Epilobium angustifolium , flower size , leaf water potential , nectar production , nectar sugar concentration , Onagraceae , Phenotypic plasticity , pollinator-mediated selection
Journal title :
American Journal of Botany
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