5 years of monitoring of zooplankton community dynamics in a newly impounded sub-tropical reservoir in Southeast Asia (Nam Theun 2, Lao PDR)
| Autor: | M. Cottet, S. Descloux |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Ecology 010604 marine biology & hydrobiology Subtropics 010501 environmental sciences Aquatic Science 01 natural sciences Zooplankton Spatial heterogeneity Fishery Food chain Geography Productivity (ecology) Phytoplankton Period (geology) Water quality Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydroécologie Appliquée. 19:197-216 |
| ISSN: | 1958-556X 1147-9213 |
| Popis: | The zooplanktonic community of the Nam Theun 2 Reservoir, newly impounded, located in Lao PDR was monitored from 2009 to 2013. Five sampling stations distributed on the surface of the reservoir were sampled on a monthly basis. Results were interpreted to assess the spatial and temporal variability of the communities and to identify environmental factors such as physical or water chemical parameters influencing communities. The zooplanktonic community was dominated by Copepods over the study period and was characterized by low densities and biomasses reflecting low productivity conditions. The spatial heterogeneity of the zooplanktonic community observed along a longitudinal gradient disappeared rapidly after the beginning of the operational phase in 2010 and tended to stabilize. The results also highlighted a seasonal variability explained by a phytoplankton-based food chain. Zooplankton communities were significantly and negatively driven by hydraulic factors, such as the mixing period, or water quality factors, such as water temperature or the depth of the oxycline. This zooplankton community must be evaluated in order to anticipate the food availability for zooplanktivorous fish before developing a fish management plan. |
| Databáze: | OpenAIRE |
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