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Specialization for canopy position by hemiepiphytic Ficus species in a Bornean rain forest

Published online by Cambridge University Press:  10 July 2009

Timothy G. Laman
Timothy G. Laman
Affiliation:
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138
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Abstract

The growth habits of five species of hemiepiphytic fig trees (Ficus subgenus Urostigma) were compared to see if any species occupied distinct canopy positions or showed unique host preferences in lowland rain forest in Gunung Palung National Park, Indonesian Borneo. Highly significant differences among species were found in the height of establishment on hosts, the level at which fig crowns were deployed, and the size and taxa of host trees. Ficus stupenda, F. dubia, and F. subtecta all had mean establishment heights between 29 and 31m above the ground, had their crowns in the upper canopy, and predominantly occupied large trees in the Dipterocarpaceae. F. consociata and F. xylophylla established at significantly lower mean heights of 24 and 18 m respectively, had their crowns predominantly in lower canopy layers, and disproportionately occupied smaller non-dipterocarp trees. These patterns were consistent both within lowland forest on alluvial terraces, which was most intensively sampled, and when data were combined from three other contiguous lowland forest habitats. Ficus species appear to be specialized to some extent for distinct microhabitats within the canopy.

Keywords

BorneocanopyFicusfighemiepiphyteIndonesiarain forest

Information

Type
Research Article
Information
Journal of Tropical Ecology , Volume 12 , Issue 6 , November 1996 , pp. 789 - 803
Copyright
Copyright © Cambridge University Press 1996

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