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Article

Fish Community Responses to Human-Induced Stresses in the Lower Mekong Basin

by 1,2,*, 3,4, 4,5, 1,4 and 3,6
1
Mekong River Commission Secretariat, P.O. Box 6101, 184 Fa Ngoum Road, Unit 18, Vientiane 01000, Laos
2
Cambodia National Mekong Committee, No. 576, National Road No. 2, Sangkat Chak Angre Krom, Khan Meanchey, Phnom Penh 12300, Cambodia
3
Laboratoire Evolution et Diversité Biologique, UMR5174, Université de Toulouse III Paul Sabatier, CNRS, IRD, 31062 Toulouse, France
4
Inland Fisheries Research and Development Institute, Fisheries Administration, No. 186, Preah Norodom Blvd., P.O. Box 582, Phnom Penh 12300, Cambodia
5
Wonders of the Mekong Project, c/o Inland Fisheries Research and Development Institute, Fisheries Administration, No. 186, Preah Norodom Blvd., P.O. Box 582, Phnom Penh 12300, Cambodia
6
Institut Universitaire de France, 75231 Paris, France
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3522; https://doi.org/10.3390/w12123522
Received: 8 October 2020 / Revised: 7 December 2020 / Accepted: 11 December 2020 / Published: 15 December 2020
The Mekong River is one of the world’s largest rivers and has an annual captured fish production of about 2.3 million tonnes, equivalent to around 11 billion USD. Although the Mekong provides important ecological and socioeconomic benefits to millions of people, it is facing intensive change due to anthropogenic stressors. Therefore, it is necessary to understand the changes to the spatiotemporal fish communities to inform sustainable fisheries management. Here, we aimed to characterize patterns of the fish communities and identify the ecological status of each fish community using daily catch data from 2007 to 2018 at 25 monitoring sites in the Lower Mekong Basin (LMB). The collected data were classified by a self-organizing map into four main groups. Group 4 represented the lower Vietnam Mekong Delta (VMD), while groups 1, 2, and 3 were subdivided into subgroups 1a (upper LMB), 1b (upper and middle LMB), 2a (Mekong River below the Khone Falls and Sesan River), 2b (Mekong River below the Khone Falls and Sekong, Sesan and Srepok (3S) Rivers), 3a (Floodplain-Tonle Sap and Songkhram) and 3b (upper VMD). Among the 571 species recorded, 119 were identified as indicator species. Based on the abundance and biomass comparison curves, the fish community of 2b was in a healthier condition with a positive W-statistic value while the rest had a negative W-statistic value. The highest species richness and diversity were observed in 3a and 2b, so these subgroups deserve high management and conservation priority. Likewise, 1a should also be considered as a high priority area since it harbors several endangered and long-distant migratory fishes. It was also noticed that the fish communities of groups 3 and 4, located far from the hydropower dams, remained mostly unchanged compared to those of groups 1 and 2, close to the mainstream and tributary dams in the upper LMB and 3S Rivers. View Full-Text
Keywords: self-organizing map; species diversity; indicator species; fish community structure; rarefaction curve; ABC curve; fish community health self-organizing map; species diversity; indicator species; fish community structure; rarefaction curve; ABC curve; fish community health
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MDPI and ACS Style

Nuon, V.; Lek, S.; Ngor, P.B.; So, N.; Grenouillet, G. Fish Community Responses to Human-Induced Stresses in the Lower Mekong Basin. Water 2020, 12, 3522. https://doi.org/10.3390/w12123522

AMA Style

Nuon V, Lek S, Ngor PB, So N, Grenouillet G. Fish Community Responses to Human-Induced Stresses in the Lower Mekong Basin. Water. 2020; 12(12):3522. https://doi.org/10.3390/w12123522

Chicago/Turabian Style

Nuon, Vanna, Sovan Lek, Peng B. Ngor, Nam So, and Gaël Grenouillet. 2020. "Fish Community Responses to Human-Induced Stresses in the Lower Mekong Basin" Water 12, no. 12: 3522. https://doi.org/10.3390/w12123522

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