Oecologia

, Volume 149, Issue 2, pp 301–311

Vertical stratification of the termite assemblage in a neotropical rainforest

Authors

    • Behavioural and Evolutionary Ecology, CP 160/12Université Libre de Bruxelles
  • Alain Dejean
    • Laboratoire d’Evolution et Diversité Biologique, UMR-CNRS 5174, Bât. 4R3Université Toulouse III
  • Bruno Corbara
    • Opération Canopée & LAPSCO, UMR-CNRS 6024Université Blaise Pascal
  • Jerôme Orivel
    • Laboratoire d’Evolution et Diversité Biologique, UMR-CNRS 5174, Bât. 4R3Université Toulouse III
  • Mirna Samaniego
    • Smithsonian Tropical Research Institute
  • Maurice Leponce
    • Section of Conservation BiologyRoyal Belgian Institute of Natural Sciences
Community Ecology

DOI: 10.1007/s00442-006-0449-5

Cite this article as:
Roisin, Y., Dejean, A., Corbara, B. et al. Oecologia (2006) 149: 301. doi:10.1007/s00442-006-0449-5

Abstract

The importance of termites as decomposers in tropical forests has long been recognized. Studies on the richness and diversity of termite species and their ecological function have flourished in more recent times, but these have been mostly conducted in a thin stratum within a standing man’s reach. Our aims were to evaluate the specific richness and composition of the termite assemblage in the canopy of a tropical rainforest and to determine its originality with respect to the sympatric ground-level fauna. We conducted systematic searches for canopy termites, together with conventional sampling of the sympatric ground-level fauna, in the San Lorenzo forest, Panama. We hypothesized that (1) the canopy accommodates two categories of wood-feeding termites (long-distance foragers and small-colony “one-piece” species) and possibly soil-feeders in suspended soil-like habitats; (2) due to the abundance of soil-feeders, the overall diversity of the ground fauna is higher than that of the canopy; (3) differences in microclimate and resource accessibility favour vertical stratification among wood-feeders. Sixty-three canopy samples yielded ten species of termites, all wood-feeders. Five of these were not found at ground level, although a total of 243 ground samples were collected, representing 29 species. In addition to long-distance foragers (Microcerotermes and Nasutitermes spp.) and small-colony termites (mostly Kalotermitidae), the canopy fauna included Termes hispaniolae, a wood-feeding Termitidae from an allegedly soil-feeding genus, living in large dead branches. Soil-feeders were absent from the canopy, probably because large epiphytes were scarce. As predicted, the ground fauna was much richer than that of the canopy, but the species richness of both habitats was similar when only wood-feeders were considered. Vertical stratification was strongly marked among wood-feeders, as all common species, apart from the arboreal-nesting Microcerotermes arboreus, could unequivocally be assigned to either a ground or a canopy group. The canopy, therefore, contributes significantly to the total species richness of the termite assemblage, and the diversity, abundance and ecological importance of canopy termites in tropical rainforests may be higher than previously recognized.

Keywords

CanopyIsopteraPanamaSpecies richnessVertical distribution

Supplementary material

Copyright information

© Springer-Verlag 2006