Spatial and temporal variation of benthic macroinvertebrates in the Nam Gnom Basin receiving discharged waters from the Nam Theun 2 Reservoir (Lao PDR)
| Autor: | P. Favriou, S.S. Phabmixay, S. Clavier, M. Cottet, P. Guédant |
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| Rok vydání: | 2015 |
| Předmět: |
Hydrology
geography education.field_of_study geography.geographical_feature_category Ecology Population Biota Aquatic Science Structural basin Southeast asian Altitude Benthic zone Tributary Environmental science education Ecology Evolution Behavior and Systematics Water Science and Technology Invertebrate |
| Zdroj: | Hydroécologie Appliquée. 19:217-243 |
| ISSN: | 1958-556X 1147-9213 |
| DOI: | 10.1051/hydro/2015008 |
| Popis: | In order to assess the impact of water release in the downstream area of the Nam Theun 2 Reservoir (Lao PDR), the spatial and temporal variation of benthic macroinvertebrates was explored. Between 2010 and 2012, five sites were monitored in the Nam Gnom Basin, a tributary of the Xe Bangfai River, receiving the turbinated waters. Repeated-time collections revealed the presence of 109 taxa mainly identified to the family level, attesting to a rich biota. Preliminary results did not show shifts in diversity, population composition, and feeding metrics. Redundancy Analysis indicated that the altitudinal gradient ( i.e . altitude and altitude-related variables) remained the major environmental factor influencing the macroinvertebrates distribution before water discharge. The presence of a tributary downstream of the release point, and the respect of the natural river inflow can explain the preservation of natural conditions. More samples and a strengthened ecological knowledge of Southeast Asian macroinvertebrates are still required to confirm these preliminary results. |
| Databáze: | OpenAIRE |
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