Diversity of Monogononta rotifer species among standing waterbodies in northern Cambodia

Sor, Ratha; Meas, Seanghun; Wong, Ken K. Y.; Min, Malay; Segers, Hendrik

doi:10.4081/jlimnol.2014.995

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…This species is known from India exclusively from Assam state of NEI (Sharma 2004, 2014, Sharma & Sharma 2008, 2014d, 2015b, Sharma et al 2015. Nevertheless, these two Australasian elements affirmed affinity of Rotifera assemblage of Assam state as well as of NEI with the faunas of Southeast Asia and Australia, and thus supported remarks of Sharma (2005) and Sharma and Sharma (2005, 2008, 2014a, 2014c, 2014d (Meas & Sanoamuang 2010, Sor et al 2015. L. blachei, described from Cambodia is also known from Thailand, while its Indian reports are restricted till date to Assam (NEI) and West Bengal (Sharma & Sharma 2014b).…”

Section: Discussionmentioning

confidence: 59%

Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

Sharma¹,

Khan²

2016

Opusc Zool

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Abstract. The plankton and semi-plankton samples collected from four floodplain lakes (beels) of Barpeta district of lower Brahmaputra river basin, Assam state, northeastern India (NEI) revealed eighteen rotifer species of biodiversity and biogeographic interest belonging to five families and six genera. One species is new to the Indian Rotifera and one species is new to Assam. Our collections are characterized by two Australasian elements, five Oriental endemics, seven paleotropical species, and one cosmo (sub) tropical species. Nine species, restricted to date to NEI, are examples of regional distribution importance in India while six species depicted disjunct distribution in the country. Interestingly, seven species are categorized as Eastern hemisphere elements. All the taxa are illustrated to warrant validation as an increasing magnitude of 'unverifiable records' is a serious impediment for the progress of rotifer biodiversity in India.

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Section: Discussionmentioning

confidence: 59%

Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

Sharma¹,

Khan²

2016

Opusc Zool

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“…It supports ~ 1200 fish species 1 , most of which live in the Lower Mekong Basin (LMB). The LMB is also home to a rich diversity of other aquatic fauna such as over 400 species of micro-invertebrates 2 , and at least 300 macroinvertebrate species such as molluscs 3 , crustaceans, annelids and aquatic insects 4 – 6 . In the LMB, fish are instrumental to the economy and provide food security for local people 7 , 8 .…”

Section: Introductionmentioning

confidence: 99%

Fish biodiversity declines with dam development in the Lower Mekong Basin

Sor

Ngor

Lek

et al. 2023

Sci Rep

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Hydropower dams are a source of renewable energy, but dam development and hydropower generation negatively affect freshwater ecosystems, biodiversity, and food security. We assess the effects of hydropower dam development on spatial–temporal changes in fish biodiversity from 2007 to 2014 in the Sekong, Sesan, and Srepok Basins—major tributaries to the Mekong River. By analyzing a 7-year fish monitoring dataset, and regressing fish abundance and biodiversity trends against cumulative number of upstream dams, we found that hydropower dams reduced fish biodiversity, including migratory, IUCN threatened and indicator species in the Sesan and Srepok Basins where most dams have been constructed. Meanwhile, fish biodiversity increased in the Sekong, the basin with the fewest dams. Fish fauna in the Sesan and Srepok Basins decreased from 60 and 29 species in 2007 to 42 and 25 species in 2014, respectively; while they increased from 33 in 2007 to 56 species in 2014 in the Sekong Basin. This is one of the first empirical studies to show reduced diversity following dam construction and fragmentation, and increased diversity in less regulated rivers in the Mekong River. Our results underscore the importance of the Sekong Basin to fish biodiversity and highlight the likely significance of all remaining free-flowing sections of the Lower Mekong Basin, including the Sekong, Cambodian Mekong, and Tonle Sap Rivers to migratory and threatened fish species. To preserve biodiversity, developing alternative renewable sources of energy or re-operating existing dams to increase power generation are recommended over constructing new hydropower dams.

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“…The Mekong River supports tremendous aquatic biodiversity, including ~1,200 fish species [21] and is home to aquatic invertebrates such as rotifers [22], aquatic insects [23,24], annelids, crustacean, and molluscs [25,26]. Fish from the Lower Mekong Basin (LMB) are a primary food source for local 2 people [27,28], and fisheries provided an estimated ~US$11 billion per year to the economy in 2015 [29].…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Dams on Streamflow in Tributaries to the Lower Mekong Basin

Khoeun,

Sor,

Chann

et al. 2024

Preprint

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The Lower Mekong Basin has had extensive hydropower dam development, which changes hydrologic conditions and threatens the exceptional aquatic biodiver-sity. This study quantifies the degree of hydrologic change between pre-impact (1965-1968) and post-impact (2018-2021) peak hydropower development in two major tributaries of the Lower Mekong Basin, the Sekong River with the fewest dams and the Sesan River with the most dams. Both rivers historically supported migratory fishes. We use daily pre- and post-impact data and the Indicators of Hydrologic Alteration framework to evaluate streamflow changes from dam development. We found signifi-cant changes in low and high magnitude flows in the pre- and post-impact periods of dam development. For the Sekong River, minimum flow had large fluctuations that ranged 290% to 412% more than the pre-impact period, while the Sesan River ranged 120% to 160% more than pre-impact. Dry season flows increased by 200±63% on av-erage in the Sekong River, which is caused by releases from upstream dams. Mean-while, Sesan River dry season flows increased by 100±55% on average. This study in-dicates that seasonal flow changes and extreme flow events occurred more frequently in the two basins following dam construction, which may threaten the ecosystem func-tions.

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Diversity of Monogononta rotifer species among standing waterbodies in northern Cambodia

Abstract: The

Cited by 5 publications

References 29 publications

Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

Fish biodiversity declines with dam development in the Lower Mekong Basin

The Impacts of Dams on Streamflow in Tributaries to the Lower Mekong Basin

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