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Changes in the Arthropod Community along an Elevational Transect in the Venezuelan Andes
D. H. Janzen, M. Ataroff, M. Fariñas, S. Reyes, N. Rincon, A. Soler, P. Soriano and M. Vera
Vol. 8, No. 3 (Sep., 1976), pp. 193-203
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2989685
Page Count: 11
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Sweep samples of insects at 200, 1600, 3550, and 3600 m elevation in secondary vegetation in the Venezuelan Andes near Mérida show that the greatest number of insect species and dry weight occurs at the intermediate elevation, that the species richness of Diptera and parasitic Hymenoptera is not as proportionately reduced by elevation as is the species richness of other insect groups, that at higher elevations there are a reduced number of species and an increasingly unequal distribution of the individuals among the species, and that large insects are much less abundant at high than low elevations. These results confirm trends first indicated in an earlier elevational transect of Costa Rican insects.
Biotropica © 1976 Association for Tropical Biology and Conservation