Abstract
We examined the composition and distribution of oligochaete communities in the hyporheic zone of the Roseg River, a glacial river in southeastern Switzerland. Ten oligochaete species were collected from 11 sites distributed along an 11-km reach of the river, downstream of the Tschierva Glacier. The most frequently encountered species were Dorydrilus michaelseni, Propappus volki, Cernosvitoviella atrata and Cernosvitoviella carpatica. Six other species were relatively scarce and exhibited a discontinuous distribution pattern only in the downstream sites. At the most downstream site, a population of eyeless Nais communis was discovered with anatomical traits apparently related to a subterranean life-adaptation of this surface-living species. The species richness and abundance of oligochaete communities were relatively constant over time, but increased at sites where groundwater entered the stream. The spatial distribution of several oligochaete species was linked to the longitudinal arrangement of groundwater upwelling areas. This observation suggested that groundwater was an important upstream migration pathway for oligochaetes during the glacial retreat.
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Lafont, M., Malard, F. Oligochaete communities in the hyporheic zone of a glacial river, the Roseg River, Switzerland. Hydrobiologia 463, 75–81 (2001). https://doi.org/10.1023/A:1013135120545
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DOI: https://doi.org/10.1023/A:1013135120545