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A gradient of interstitial Niphargus rhenorhodanensis populations in two karst/floodplain transition zones of the French Jura |
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| Authors: | Jacques Mathieu Khadija Essafi-Chergui Fabrice Jeannerod |
| Affiliation: | (1) Laboratoire de Biologie Animale et Ecologie, Equipe d'Hydrobiologie et Ecologie Souterraines, Université Claude Bernard Lyon I, U.R.A. C.N.R.S. 1451, 43 Bd du 1 novembre 1918, F-69622 Villeurbanne cedex, France;(2) Laboratoire d'Hydrobiologie et Ecologie Générale, Université Mohammed Ier, Faculté des Sciences, B.P. 524 Oujda, Morocco |
| Abstract: | The Bou-Rouch technique was used to sample two small alluvial plains in two different karst areas. One was mainly supplied by karst water (Verna), the other by both karst and surface water (Pissoir).Physical and chemical characteristics varied with time (seasons) and location of sampling sites at both stations.The distribution of Niphargus rhenorhodanensis populations was influenced by the geographical characteristics of the outlets. Only a small number of individuals was found near the outlet and none in the floodplain when the outlet was located at a base-level (Verna). Individuals were more numerous and their presence constant at all sites and dates when the outlet was located at the overflow level of the massif (Pissoir). |
| Keywords: | Niphargus rhenorhodanensis population dynamics karst alluvial floodplain interstitial environment environmental parameters space and time changes |
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