Toward an ecological understanding of a flood-pulse system lake in a tropical ecosystem: Food web structure and ecosystem health

Chea, Ratha; Guo, Chuanbo; Grenouillet, Gaël; Lek, Sovan

doi:10.1016/j.ecolmodel.2015.11.014

Cited by 36 publications

(15 citation statements)

References 52 publications

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“…The hydropeaking flows decline fish populations, including the reduction of macro-invertebrate species [55]. When the invertebrate communities are destroyed, the fish assemblages will also be strongly affected as they assemble the nutritional basis for rich fish species [56]. Hydro peaking has been found to destroy the aquatic biota by slashing the species number, biomass, and diversity, and altering the composition of fish communities [53][54][55][56].…”

Section: Hydro Peaking Impacts On Fish Capture Yieldsmentioning

confidence: 99%

Impacts of Mainstream Hydropower Dams on Fisheries and Agriculture in Lower Mekong Basin

et al. 2020

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The riverine ecosystems of the Mekong River Basin possess the world’s most productive inland fishery and provide highly productive food crops for millions of people annually. The development of hydropower potential in the Mekong River has long been of interest to governments in the region. Among the existing 64 dams, 46 dams have been built in the Lower Mekong Basin (LMB) to produce up to 8650 MW of electricity. Additionally, of the 123 proposed built hydropower dams, eleven hydropower plants have been nominated for the river mainstream and are expected to install a total of 13,000 MW in the LMB countries. However, serious concerns have intensified over the potential negative economic consequences, especially on fisheries and agriculture in Cambodia and Vietnam. To date, most of the concerns have concentrated on the impacts on hydrology, environment, livelihood, and diversity in the LMB attributed to hydropower development. This paper, however, discusses the fishery and agricultural sectors of the LMB and focuses on the downstream floodplains of Cambodia and Vietnam. The dam construction has caused greater losses of biodiversity and fisheries than climate change in the LMB. The reduction of 276,847 and 178,169 t of fish, 3.7% and 2.3% of rice, 21.0% and 10.0% of maize will contribute to a decrease of 3.7% and 0.3% of the GDP of Cambodia and Vietnam, respectively. Lao PDR may benefit the most revenue from electricity generation than the other country in the LMB, as most of the proposed dams are projected in the country. Cambodia burdens 3/4 of the reduction of total capture fishery destruction, whilst Lao PDR, Thailand, and Vietnam endure the remaining 1/3 losses. The tradeoff analyses reveal that losses of capture fisheries, sediment or nutrients, and social mitigation costs are greater than the benefits from electricity generation, improved irrigation, and flood control of the LMB region. The socioeconomic and environmental damage caused by hydropower dams in developing countries, including the Mekong, is greater than the early costs in North America and Europe. It is proposed that dam construction for hydropower in the Mekong River, as well as other rivers in developing countries, should be gradually removed and shifted toward solar, wind, and other renewable resources.

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Section: Hydro Peaking Impacts On Fish Capture Yieldsmentioning

confidence: 99%

Impacts of Mainstream Hydropower Dams on Fisheries and Agriculture in Lower Mekong Basin

et al. 2020

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“…The Tonle Sap Lake (TSL) is a major natural reservoir in the Mekong River, and it is the largest natural inland lake in Southeast Asia (Chea et al, 2016) and a biodiversity hotspot and a World Heritage Biosphere Reserve (Lamberts, 2006). After the African Great Lakes, the TSL has the second highest freshwater fish biodiversity in the world (Baran et al, 2013), and it is one of the world's most productive fisheries and fish species-rich lakes .…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal changes in fish yields and fish communities in the largest tropical floodplain lake in Asia

Chan¹,

Ngor²,

So³

et al. 2017

Ann. Limnol. - Int. J. Lim.

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-Although the Tonle Sap Lake is the largest natural inland lake in Southeast Asia, little is known about the spatio-temporal patterns of its composition and yields. The present paper aimed to investigate the temporal change of yields of the most dominant fish species and to evaluate the spatio-temporal changes in the fish community and the indicator species of assemblages. Fish catch data were collected from thirtythree fishing lots around the lake during the open season from October to May each year between 1994 and 2000. The fish yields were dominated by few commercial fishes: Channa micropeltes, Pangasianodon hypophthalmus, Channa striata, Cyclocheilichthys enoplos, Henicorhynchus spp., Barbonymus gonionotus, Micronema spp. and Trichopodus microlepis. The standard linear regression coefficients of the fish yields versus year were negative for all these commercial species except T. microlepis. Moreover, the total fish yields of the lake were temporally declined (standard coefficient = À2.410, adjusted r 2 = 0.272). Nonmetric multidimensional scaling of the fish assemblage data showed a clear opposition between northern assemblage and southern assemblage along the first axis, and the temporal pattern of the samples from 1994 to 1999 was explained by the second axis. The fish species assemblage from earlier years (1994 and 1995) was characterised by the abundance of all functional groups of black-white-grey fish species, but more recent years (1996)(1997)(1998)(1999) were linked to white and grey functional groups, which was explained by a decrease in many black fishes.

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“…The recent researches suggest that the ecosystem of TSL had achieved a certain stage of maturity until at least 2010 and its food web is being a vulnerable, albeit with the relatively healthy ecosystem [6,7]. Furthermore, the future of TSL is uncertain.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of a GPGPU-Acceleration to Inundation Flow Simulation in Tonle Sap Lake in Cambodia

Nakamura¹,

Murakami²,

Lun³

et al. 2019

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A new two-dimensional numerical model is developed for a rapid computation of the seasonal inundation phenomena in Tonle Sap Lake in Cambodia. In order to overcome a huge computational cost for a prolonged analysis over an extensive area, the General-Purpose computing on Graphics Processing Units (GPGPU) technology is applied to the model. The developed model is applied to a solution of seasonal inundation process for the 154 days in 2002. Calculated result is compared with observational data and satellite remote sensing. It is found that the developed model seems to successfully reproduce reasonable progress/regress of inundation. A breakdown of the total elapsed time for the numerical analysis is considered in a detail. It is found that the GPGPU technology can accelerate the solution more than one hundred times faster by employing a simple rectangular mesh and coding to reduce a memory access overhead.

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Toward an ecological understanding of a flood-pulse system lake in a tropical ecosystem: Food web structure and ecosystem health

Cited by 36 publications

References 52 publications

Impacts of Mainstream Hydropower Dams on Fisheries and Agriculture in Lower Mekong Basin

Impacts of Mainstream Hydropower Dams on Fisheries and Agriculture in Lower Mekong Basin

Spatial and temporal changes in fish yields and fish communities in the largest tropical floodplain lake in Asia

Efficacy of a GPGPU-Acceleration to Inundation Flow Simulation in Tonle Sap Lake in Cambodia

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