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Sihanoukville, Cambodia

Chea R.,CNRS Biological Evolution and Diversity Laboratory | Chea R.,University of Battambang | Guo C.,CNRS Biological Evolution and Diversity Laboratory | Guo C.,CAS Wuhan Institute of Hydrobiology | And 2 more authors.
Ecological Modelling | Year: 2016

Tonle Sap Great Lake (TSL) is the largest freshwater lake ecosystem in Southeast Asia and receptacle of impressive biodiversity. However, there is surprisingly little knowledge of its ecosystem structure and functioning. The main objective of the current work was to quantify the food web structure and assess the ecosystem health status of the TSL system by constructing the first holistic food web model using Ecopath with Ecosim (EwE). The results indicate that the ecotrophic efficiency (EE) values were very high for most of functional groups (EE. >. 0.5) except molluscs (0.146) and macrophytes (0.102). The high EE values together with the MTI (Mixed Trophic Impact) analysis indicated the overexploitation and degradation of fishery resources in the TSL system. The discrete trophic levels varied from 1 (phytoplankton, macrophytes and detritus) to 3.17 (snakehead). The energy transfer in the TSL food web was based mostly on the detrital food chain (77.9%) rather than the grazing food chain (22.1%), with an average transfer efficiency of 8.27%. The ratios of total primary production to respiration (TPP/TR) and to biomass (TPP/TB) were 1.23 and 2.04, respectively, while the Ascendency and Finn cycling index (FCI) of the system were estimated at 27.4% and 23.62%. Nevertheless, the connectance index (CI: 0.253) and system omnivory index (SOI: 0.075) were in-between compared to other lake ecosystems, which indicated that the food web structure was characterized by linear, rather than web-like features. Systematic analysis and indicators suggested that the ecosystem was a relatively healthy ecosystem achieving a certain stage of maturity, albeit with a vulnerable food web structure. Accordingly, some ecosystem-based strategies are presented for the improvement of fishery management and ecosystem conservation in TSL. © 2015 Elsevier B.V.

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Founder The University Of Battambang (UBB) was founded by SAMDACH KROLA HOM SAR KHENG, Deputy Prime Minister, Minister Of Interior, in 2007 with the vision of providing opportunities to students living in rural areas, especially in north-western Cambodia. These opportunities include access to higher education and services that contribute towards the development of their individual careers as well as to that of local communities while at the same time reducing the knowledge gap between the rural and urban population

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