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Canopy closure and the distribution of tropical forest tree species at La Selva, Costa Rica

Published online by Cambridge University Press:  10 July 2009

Milton Lieberman ,
Diana Lieberman ,
Rodolfo Peralta  and
Gary S. Hartshorn
Milton Lieberman
Affiliation:
Department of Biology, University of North Dakota, Grand Forks, ND 58202-9019, USA, and Apartado 35, Santa Elena de Monteverde, Puntarenas, Costa Rica
Diana Lieberman
Affiliation:
Department of Biology, University of North Dakota, Grand Forks, ND 58202-9019, USA, and Apartado 35, Santa Elena de Monteverde, Puntarenas, Costa Rica
Rodolfo Peralta
Affiliation:
Centro Cientifico Tropical, Apartado 8-3870, and Portico, S.A., San Jose, Costa Rica
Gary S. Hartshorn
Affiliation:
World Wildlife Fund, 1250 24th St., NW, Washington, DC 20037, USA
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Abstract

An index of canopy closure was used to estimate closure above the crowns of all trees ≥ 10 cm dbh in 11.11 ha of undisturbed lowland tropical forest at La Selva, Costa Rica. To correct for the efFects of tree size on canopy closure, we used the residual of the regression of the canopy closure index on tree size. Analyses were carried out for the 104 species which had ≥ individuals; a total of 3224 trees were included. Nine species were found to have their crowns in significantly more open conditions than expected by chance and five species were found to have their crowns in significantly more closed conditions than expected by chance (P < 0.05). The remaining 90 species (86.5% of the assemblage) were distributed at random with respect to canopy closure, occupying the available light conditions indiscriminately. Species occurring under higher light levels did not show a narrower range of tolerance than did other species. Most species were found to occur over a substantial proportion of the canopy closure continuum present in the stand; overlap among the great majority of species in the assemblage is extensive. The results support the view that tropical forests comprise assemblages of generalist tree species, and raise questions about the classic notions of gap-phase dynamics.

Keywords

canopy closureCosta Ricaforest structuregapshabitat preferenceLa Selvalightniche breadthshade tolerancetropical forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 11 , Issue 2 , May 1995 , pp. 161 - 177
Copyright
Copyright © Cambridge University Press 1995

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