Macrozoobenthos of the Mekong River Delta under Conditions of Extremely Low Water

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY Inland Water Biology Pub Date : 2024-06-29 DOI:10.1134/s1995082924700238
A. A. Prokin, D. G. Seleznev, Cu Nguyen Dinh, Tran Van Tien, A. I. Tsvetkov
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Abstract

In 2019, due to changes in the hydrograph caused by the construction of dams upstream, the Mekong River Basin experienced a decline in delta water level. In this year, macrozoobenthos communities of the Bassac (Hau) and Mekong (Tien) Rivers in Vietnam were studied in April and December. The total species richness, abundance, and biomass of studied macrozoobenthos assemblages did not depend on any environmental factors. The β-diversity estimation for species abundance shows the existence of three groups of species assemblages, related mostly to salinity. Most assemblages were characterized by low species richness (3.2 on average) and similarity (general mean Bray-Curtis = 8%), a large number of species, which were dominants in certain assemblages (31–42% of the total list), with the absence of a relationship with hydrological zones or seasons. This allowed us to consider these groupings as “pseudocommunities”, randomly formed in the extreme conditions of a sharp change in the hydrological regime of the Mekong River Delta in 2019.

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极度缺水条件下湄公河三角洲的大型底栖生物
摘要2019年,由于上游修建水坝导致水文变化,湄公河流域出现了三角洲水位下降的现象。在这一年的 4 月和 12 月,对越南巴萨克河(河口河)和湄公河(田河)的大型底栖生物群落进行了研究。所研究的大型底栖生物群落的物种丰富度、丰度和生物量与任何环境因素无关。物种丰度的 β-多样性估算表明,存在三组物种群,主要与盐度有关。大多数物种群的特点是物种丰富度(平均 3.2)和相似度(Bray-Curtis 总平均值 = 8%)较低,物种数量较多,在某些物种群中占主导地位(占总数的 31-42%),与水文区域或季节没有关系。因此,我们可以将这些群落视为 "伪群落",是在 2019 年湄公河三角洲水文系统急剧变化的极端条件下随机形成的。
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来源期刊
Inland Water Biology
Inland Water Biology 生物-海洋与淡水生物学
CiteScore
1.30
自引率
55.60%
发文量
87
审稿时长
6-12 weeks
期刊介绍: Inland Water Biology publishes thematic reviews and original papers devoted to flora and fauna in waterbodies, biodiversity of hydrobionts, biology, morphology, systematics, ecology, ethology, ecological physiology and biochemistry of aquatic organisms, patterns of biological cycle, structure and functioning of aquatic ecosystems, anthropogenic and uncontrolled natural impacts on aquatic organisms and ecosystems, invasion of nonindigenous species into ecosystems and their ecology, methods of hydrobiological and ichthyological studies.
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