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A protocol for sampling vascular epiphyte richness and abundance

Published online by Cambridge University Press:  01 March 2009

Jan H. D. Wolf ,
S. Robbert Gradstein  and
Nalini M. Nadkarni
Jan H. D. Wolf*
Affiliation:
Institute for Biodiversity and Ecosystem Dynamics (IBED), Universiteit van Amsterdam, Kruislaan 318, NL-1098 SM Amsterdam, the Netherlands
S. Robbert Gradstein
Affiliation:
Institute of Plant Sciences, University of Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany
Nalini M. Nadkarni
Affiliation:
The Evergreen State College, Olympia, Washington 98505, USA
*
1Corresponding author. Email: [email protected]
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Abstract:

The sampling of epiphytes is fraught with methodological difficulties. We present a protocol to sample and analyse vascular epiphyte richness and abundance in forests of different structure (SVERA). Epiphyte abundance is estimated as biomass by recording the number of plant components in a range of size cohorts. Epiphyte species biomass is estimated on 35 sample-trees, evenly distributed over six trunk diameter-size cohorts (10 trees with dbh > 30 cm). Tree height, dbh and number of forks (diameter > 5 cm) yield a dimensionless estimate of the size of the tree. Epiphyte dry weight and species richness between forests is compared with ANCOVA that controls for tree size. SChao1 is used as an estimate of the total number of species at the sites. The relative dependence of the distribution of the epiphyte communities on environmental and spatial variables may be assessed using multivariate analysis and Mantel test. In a case study, we compared epiphyte vegetation of six Mexican oak forests and one Colombian oak forest at similar elevation. We found a strongly significant positive correlation between tree size and epiphyte richness or biomass at all sites. In forests with a higher diversity of host trees, more trees must be sampled. Epiphyte biomass at the Colombian site was lower than in any of the Mexican sites; without correction for tree size no significant differences in terms of epiphyte biomass could be detected. The occurrence of spatial dependence, at both the landscape level and at the tree level, shows that the inclusion of spatial descriptors in SVERA is justified.

Keywords

autocorrelationbromeliadsColombiacommunity ecologyMexicomultivariate analysisoak forestspecies diversity
Type
Research Article
Information
Journal of Tropical Ecology , Volume 25 , Issue 2 , March 2009 , pp. 107 - 121
Copyright
Copyright © Cambridge University Press 2009

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