Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams
1. A study on glacial stream ecosystems was carried out in six regions across Europe, from Svalbard to the French Pyrenees. The main aim was to test the validity of the conceptual model of Milner & Petts (1994) with regard to the zonation of chironomids of glacier-fed rivers along altitudinal an...
Published in: | Freshwater Biology |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2001
|
Subjects: | |
Online Access: | https://archive-ouverte.unige.ch/unige:72899 |
id |
ftunivgeneve:oai:unige.ch:aou:unige:72899 |
---|---|
record_format |
openpolar |
spelling |
ftunivgeneve:oai:unige.ch:aou:unige:72899 2023-10-01T03:54:21+02:00 Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams Lods-Crozet, Brigitte Lencioni, V. Olafsson, J. S. Snook, D. L. Velle, G. Brittain, J. E. Castella, Emmanuel Rossaro, B. 2001 https://archive-ouverte.unige.ch/unige:72899 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-2427.2001.00859.x https://archive-ouverte.unige.ch/unige:72899 unige:72899 info:eu-repo/semantics/restrictedAccess ISSN: 0046-5070 Freshwater biology, vol. 46, no. 12 (2001) p. 1791-1809 info:eu-repo/classification/ddc/333.7-333.9 info:eu-repo/classification/ddc/550 Alpine Arctic Glacial stream Chironomidae Latitudinal distribution info:eu-repo/semantics/article Text Article scientifique info:eu-repo/semantics/publishedVersion 2001 ftunivgeneve https://doi.org/10.1046/j.1365-2427.2001.00859.x 2023-09-07T07:25:31Z 1. A study on glacial stream ecosystems was carried out in six regions across Europe, from Svalbard to the French Pyrenees. The main aim was to test the validity of the conceptual model of Milner & Petts (1994) with regard to the zonation of chironomids of glacier-fed rivers along altitudinal and latitudinal gradient. 2. Channel stability varied considerably, both on the latitudinal and altitudinal scale, being lowest in the northern regions (Svalbard, Iceland and Norway) and the Swiss Alps. Water temperature at the upstream sites was always <2 °C. 3. There was a prominent difference in taxonomic richness between the Alpine and the northern European regions, with a higher number of taxa in the south. In all regions, the chironomid community was characterized by the genus Diamesa and the subfamily Orthocladiinae. Of a total of 63 taxa recorded, two (Diamesa bertrami and Orthocladius frigidus) were common in all the regions except Svalbard. 4. On the basis of cluster analysis, seven distinct groups of sites were evident amongst glacial-fed systems of the ®ve regions (Pyrenees excluded). This classi®cation separated the glacier-fed streams on geographical, latitudinal and downstream gradients. 5. Canonical Correspondence Analysis (CCA) of environmental variables was carried out using 41 taxa at 105 sites. Slope, water depth, distance from source, water temperature and the Pfankuch channel stability index were found to be the major explanatory environmental variables. The analysis separated Diamesinae and typical upstream orthoclads from the other chironomids by low temperature and high channel instability. 6. In all six regions, Diamesa was present closest to the glacier. Within 200 m of the glacier snout, other genera of Diamesinae were found together with Orthocladiinae. Pioneer taxa like Diamesa species coexisted with later colonizers like Eukiefferiella minor/®ttkaui in relatively unstable channels. 7. The longitudinal succession of chironomid assemblages across altitudinal and latitudinal gradients in ... Article in Journal/Newspaper Arctic glacier glacier glacier Iceland Svalbard Université de Genève: Archive ouverte UNIGE Arctic Svalbard Norway Freshwater Biology 46 12 1791 1809 |
institution |
Open Polar |
collection |
Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/333.7-333.9 info:eu-repo/classification/ddc/550 Alpine Arctic Glacial stream Chironomidae Latitudinal distribution |
spellingShingle |
info:eu-repo/classification/ddc/333.7-333.9 info:eu-repo/classification/ddc/550 Alpine Arctic Glacial stream Chironomidae Latitudinal distribution Lods-Crozet, Brigitte Lencioni, V. Olafsson, J. S. Snook, D. L. Velle, G. Brittain, J. E. Castella, Emmanuel Rossaro, B. Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
topic_facet |
info:eu-repo/classification/ddc/333.7-333.9 info:eu-repo/classification/ddc/550 Alpine Arctic Glacial stream Chironomidae Latitudinal distribution |
description |
1. A study on glacial stream ecosystems was carried out in six regions across Europe, from Svalbard to the French Pyrenees. The main aim was to test the validity of the conceptual model of Milner & Petts (1994) with regard to the zonation of chironomids of glacier-fed rivers along altitudinal and latitudinal gradient. 2. Channel stability varied considerably, both on the latitudinal and altitudinal scale, being lowest in the northern regions (Svalbard, Iceland and Norway) and the Swiss Alps. Water temperature at the upstream sites was always <2 °C. 3. There was a prominent difference in taxonomic richness between the Alpine and the northern European regions, with a higher number of taxa in the south. In all regions, the chironomid community was characterized by the genus Diamesa and the subfamily Orthocladiinae. Of a total of 63 taxa recorded, two (Diamesa bertrami and Orthocladius frigidus) were common in all the regions except Svalbard. 4. On the basis of cluster analysis, seven distinct groups of sites were evident amongst glacial-fed systems of the ®ve regions (Pyrenees excluded). This classi®cation separated the glacier-fed streams on geographical, latitudinal and downstream gradients. 5. Canonical Correspondence Analysis (CCA) of environmental variables was carried out using 41 taxa at 105 sites. Slope, water depth, distance from source, water temperature and the Pfankuch channel stability index were found to be the major explanatory environmental variables. The analysis separated Diamesinae and typical upstream orthoclads from the other chironomids by low temperature and high channel instability. 6. In all six regions, Diamesa was present closest to the glacier. Within 200 m of the glacier snout, other genera of Diamesinae were found together with Orthocladiinae. Pioneer taxa like Diamesa species coexisted with later colonizers like Eukiefferiella minor/®ttkaui in relatively unstable channels. 7. The longitudinal succession of chironomid assemblages across altitudinal and latitudinal gradients in ... |
format |
Article in Journal/Newspaper |
author |
Lods-Crozet, Brigitte Lencioni, V. Olafsson, J. S. Snook, D. L. Velle, G. Brittain, J. E. Castella, Emmanuel Rossaro, B. |
author_facet |
Lods-Crozet, Brigitte Lencioni, V. Olafsson, J. S. Snook, D. L. Velle, G. Brittain, J. E. Castella, Emmanuel Rossaro, B. |
author_sort |
Lods-Crozet, Brigitte |
title |
Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
title_short |
Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
title_full |
Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
title_fullStr |
Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
title_full_unstemmed |
Chironomid (Diptera: Chironomidae) communities in six European glacier-fed streams |
title_sort |
chironomid (diptera: chironomidae) communities in six european glacier-fed streams |
publishDate |
2001 |
url |
https://archive-ouverte.unige.ch/unige:72899 |
geographic |
Arctic Svalbard Norway |
geographic_facet |
Arctic Svalbard Norway |
genre |
Arctic glacier glacier glacier Iceland Svalbard |
genre_facet |
Arctic glacier glacier glacier Iceland Svalbard |
op_source |
ISSN: 0046-5070 Freshwater biology, vol. 46, no. 12 (2001) p. 1791-1809 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-2427.2001.00859.x https://archive-ouverte.unige.ch/unige:72899 unige:72899 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1046/j.1365-2427.2001.00859.x |
container_title |
Freshwater Biology |
container_volume |
46 |
container_issue |
12 |
container_start_page |
1791 |
op_container_end_page |
1809 |
_version_ |
1778521867097735168 |