Primary production estimated for large lakes and reservoirs in the Mekong River Basin
| Autor: | Michio Fukushima, Tuantong Jutagate, Mikiya Hiroki, Akio Imai, Noriko Tomioka, Piyathap Avakul, Tomoyoshi Murata, Pisit Phomikong, Chatchai Preecha |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Wet season
Environmental Engineering 010504 meteorology & atmospheric sciences Fish farming Drainage basin 010501 environmental sciences Structural basin 01 natural sciences Rivers Dissolved organic carbon Dry season medicine Animals Environmental Chemistry Waste Management and Disposal Ecosystem 0105 earth and related environmental sciences Hydrology geography Habitat fragmentation geography.geographical_feature_category Fishes Seasonality medicine.disease Pollution Carbon Lakes Environmental science |
| Zdroj: | Science of The Total Environment. 747:141133 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2020.141133 |
| Popis: | Understanding the proximate factors and mechanisms driving primary production in manmade reservoirs is crucial because such production can translate into added fish yields that provide people with food and livelihoods. Furthermore, reservoir fish production could potentially compensate for the loss of fish yields due to habitat fragmentation and alterations caused by damming and impoundment. We monitored primary production, identified environmental factors responsible for its variability, and examined the relationship between primary production and fish production in nine large water bodies of the Lower Mekong Basin for 2 years. The estimated primary production ranged from 40 to 302 g C/m2/y and was generally greater in the wet season than in the dry season. Linear mixed-effects modelling identified the concentration of dissolved inorganic carbon as a significant fixed-effect variable regulating primary production, after variability due to random and fixed effects of water body and seasonality, respectively, were taken into account. Fish yields marginally increased with increasing primary production across the water bodies, with the estimated energy transfer efficiency ranging from 0.004 to 0.009. Dissolved inorganic carbon was partly determined by the lithological composition of the water body catchment, suggesting that the geographic locations of proposed dams determine the magnitude of primary production and hence future fish production. |
| Databáze: | OpenAIRE |
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