Altitudinal replacement of Ephemeroptera in a subtropical river |
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Authors: | E. Dominguez J. M. Ballesteros Valdez |
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Affiliation: | (1) CONICET, Facultad de Ciencias Naturales, Universidad Nacional de Tucumán, Miguel Lillo 251, 4.000 S. M. de Tucumán, Argentina;(2) Facultad de Ciencias Naturales, Universidad Nacional de Tucumán, Miguel Lillo 251, 4.000 Tucumán, Argentina |
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Abstract: | An altitudinal sampling transect was established in a subtropical mountain river to determine if replacement between two mayfly faunal components (oligostenothermal and polystenothermal) occurred. We detected three main groups: Group A, species with high abundance at higher stations, declining abruptly downstream; Group B, species with maximum abundance at lower elevations; either declining abruptly upstream or absent from higher elevations; and Group C, species with little elevational change. The physical and chemical variables did not change abruptly with altitude during our winter sampling, although the distribution of groups A and B species did. The observed distributional patterns of groups A and B do not appear to be correlated with variations in the physical and chemical variables surveyed. |
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Keywords: | South America Neotropical rivers limnology altitudinal zonation Ephemeroptera |
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