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Sapling Diversity in Canopy Gaps in an Ecuadorian Rain Forest

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Abstract:



In a “terra firme” rain forest (Amazonian Ecuador) we quantified the species abundance distribution, gap size, gap isolation, sapling diversity, and gap community similarity for 24 initial gap communities. The pooled community distributions showed a log-series distribution, mainly because 2-D space was partitioned during the forest cycle's first stages, and randomness is accepted as influencing both species arrival and gap formation. Gap size interacted with species richness and evenness due to the low species abundances. The species composition in each gap was an almost unique set: on average, a gap shared <20% of its species with any other gap. A cluster analysis confirmed this observation: the first fusion occurred at a similarity level of 0.42, which related to <27% of common species. Despite this high intergap dissimilarity, association analysis showed that 33.7% of all pairwise gap comparisons represented a significant association, indicating that more species were in common than expected with random assumptions. A principal components analysis revealed three dimensions in the data; sapling diversity, community similarity, and gap size were found to be independent of gap isolation. The uniqueness of the communities in terms of sapling composition highlights the value of gaps for conservation. FOR. SCI. 49(6):909–917.

Keywords: Forest cycle; Gini evenness index; Sørensen similarity index; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; gap isolation; log-series model; natural resource management; natural resources

Document Type: Miscellaneous

Affiliations: 1: Department of Biology, University of Antwerp, Universiteitsplein 1, Wilrijk, Belgium, B-2610, david.salvador@ua.ac.be 2: École Interfacultaire de Bioingénieurs, Université Libre de Bruxelles, 50 Avenue F.D. Roosevelt, Bruxelles, Belgique, B-1050, Phone: +32 2 650 29 03; Fax: +32 2 650 35 38 jan.bogaert@ulb.ac.be 3: School of Environmental Sciences, Círculo de Cumbayá, Universidad San Francisco de Quito, P.O. Box 17-12-841 Quito, Ecuador, vlastimilz@mail.usfq.edu.ec 4: Department of Biology, University of Antwerp, Universiteitsplein 1, Wilrijk, Belgium, B-2610, reinhart.ceulemans@ua.ac.be

Publication date: December 1, 2003

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