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Communication at the NABS Annual meeting, Keystone, 2000
(101) VARIATION AND COVARIATION IN THE STRUCTURE OF BENTHIC MACROINVERTEBRATE COMMUNITIES AND THEIR ENVIRONMENTS AT TWO SPATIAL SCALES IN A TROPICAL STREAM.
L. Boyero1, A. García-Valdecasas1, and R.C. Bailey2. 1Departamento de Biodiversidad y Biologia Evolutiva, Museo Nacional de Ciencias Naturales, Madrid, Spain, 2Department of Zoology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
The variability and covariability of benthic macroinvertebrate communities and their environments at two spatial scales was examined in Juncal stream (Coiba Island, Panama). Surber samples, together with basic habitat descriptors (current velocity, water depth and stream width), were taken at 3 random points within each of 3 sites within each of 3 stream orders in Juncal Stream. Variability and covariability of benthic macroinvertebrate density, taxon richness, Shannon's diversity and the 3 abiotic variables was assessed at the scales of within sites, within stream orders, and among stream orders using nested ANOVA. The variation in community composition was described using a semi-strong, hybrid multidimensional scaling of the benthic macroinvertebrate communities. Biotic variables showed greater variation among stream orders and among sampling points at a site, rather than among sites within a stream order. Abiotic variables showed a different and less consistent pattern of variation across scales. Our results for a tropical stream are comparable to those of other studies for temperate streams.
Presented at 10:15 AM on Tuesday, May 30, 2000 in Food Webs and Communities II
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