Publication: Primary production estimated for large lakes and reservoirs in the Mekong River Basin
Issued Date
2020-12-10
Resource Type
ISSN
18791026
00489697
00489697
Other identifier(s)
2-s2.0-85088914099
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Mahidol University
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SCOPUS
Bibliographic Citation
Science of the Total Environment. Vol.747, (2020)
Suggested Citation
Mikiya Hiroki, Noriko Tomioka, Tomoyoshi Murata, Akio Imai, Tuantong Jutagate, Chatchai Preecha, Piyathap Avakul, Pisit Phomikong, Michio Fukushima Primary production estimated for large lakes and reservoirs in the Mekong River Basin. Science of the Total Environment. Vol.747, (2020). doi:10.1016/j.scitotenv.2020.141133 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/57903
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Title
Primary production estimated for large lakes and reservoirs in the Mekong River Basin
Abstract
© 2020 The Authors 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.