| Titre | Les communautés d'invertébrés d'anciens bras secondaires de la basse Salzach soumise à incision (Allemagne) / Macro-invertebrate communities in the abandoned channels of a river in the process of entrenchment : the lower Salzach, Bavaria, Germany | |
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| Auteur | Francis Foeckler | |
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Revue |
Géocarrefour Titre à cette date : Revue de géographie de Lyon |
| Numéro | volume 69, no 1, 1994 Enfoncement des lits fluviaux : processus naturels et impacts des activités humaines | |
| Page | 31-40 | |
| Résumé anglais |
The floodplains of the Lower Salzach are gradually drying out due to the rarefaction of floods and and the lowering of the groundwater table. This latter feature has been caused by incision of the river's bed as a consequence of channel rectification, bed load removal, and upstream impoundment. In 1991 a selection of 45 water environements was characterized by the analysis of 11 different macro-invertebrate groups leading to the bio- indication of 5 types of former channels and backwaters ; this analysis was more accurate than an earlier study (1989) identifying 3 water environment- types using only aquatic molluscs. The result demonstrates that, other than the absence of floods, the groundwater influx becomes the most dominant factor for aquatic life in the remaining water environments. Their water supply depends on their depth, meaning that if their base level lies above the groundwater table's amplitude, they become desiccated permanently. Source : Éditeur (via Persée) |
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| Article en ligne | http://www.persee.fr/web/revues/home/prescript/article/geoca_0035-113x_1994_num_69_1_4235 |
