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A Comparison of Longitudinal Patterns in Hyporheic and Benthic Oligochaete Assemblages in a Glacial River
Florian Malard, Michel Lafont, Peter Burgherr and J. V. Ward
Arctic, Antarctic, and Alpine Research
Vol. 33, No. 4, Symposium: High-Mountain Lakes and Streams: Indicators of a Changing World (Nov., 2001), pp. 457-466
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1552556
Page Count: 10
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This paper examines the longitudinal pattern of oligochaetes in the hyporheic and benthic layers of a glacial river (Val Roseg, Switzerland). We hypothesized that the spatial distribution of oligochaete communities would reflect changes in surface water/groundwater interactions along the river continuum. From June to November 1997 (4 dates), three hyporheic and three benthic samples were collected at 11 and 9 sites, respectively, located over a distance of 11 km from the glacier terminus. A two-ended member mixing model based on concentrations of sodium was used to determine changes in the relative proportions of glacial water and groundwater along the river. The longitudinal increase in the diversity and abundance of hyporheic assemblages of oligochaetes was closely linked to the convergence of groundwater and surface glacial water. The differential distribution of hyporheic and benthic assemblages suggested that the hyporheic corridor acted as the main upstream migration pathway for oligochaetes. In this glacial river, the hyporheic zone appeared as a source area from which benthic habitats presenting suitable environmental conditions could be colonized.
Arctic, Antarctic, and Alpine Research © 2001 Regents of the University of Colorado, a body corporate, contracting on behalf of the University of Colorado at Boulder for the benefit of INSTAAR