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Epiphyte diversity and biomass in the canopy of lowland and montane forests in Ecuador

Published online by Cambridge University Press:  16 November 2000

Martin Freiberg
Affiliation:
Abteilung Systematische Botanik und Ökologie, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
Elke Freiberg
Affiliation:
Abteilung Systematische Botanik und Ökologie, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

Abstract

Epiphyte diversity as well as distribution and composition of epiphytic biomass was investigated in two lowland and two montane rain forests in Ecuador. Species numbers of epiphytes per tree were slightly higher in the montane (22–41 in Los Cedros, 33–54 in Otonga) than in the lowland forests (9–43 in Yasuni, 19–32 in Tiputini), however differences were not significant. In contrast, some epiphyte families did show significant altitudinal differences. The total epiphytic biomass per branch surface decreased from the centre of the crown to the periphery, and was generally higher in the montane (6.0 kg m−2 on central branches in Los Cedros, 1.8 kg m−2 in Otonga) than in the lowland forests (1.3 kg m−2 in Yasuni and 1.8 kg m−2 in Tiputini). Especially, dry weight of bryophytes and dead organic matter was higher in the mountains. In contrast, the biomass of green parts of vascular epiphytes on central branches was about the same in all four forests (0.4–0.6 kg m−2). A comparison with literature data from other study sites of tropical moist forests supports the observation that biomass of vascular epiphytes does not significantly change with altitude. It is discussed, that the high bryophytic biomass in montane compared to lowland forests is a major reason for differences in humus biomass between these forest types.

Type
Research Article
Copyright
2000 Cambridge University Press

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