Threats and protection policies of the aquatic biodiversity in the Yangtze River

Chen, Tinggui; Yan, Wang; Gardner, Caleb; Wu, Feng

doi:10.1016/j.jnc.2020.125931

Cited by 69 publications

(36 citation statements)

References 32 publications

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“…It flows through mountains, plateaus, basins (tributaries), hills, and plains, as well as the Qinghai Tibet Plateau, Hengduan Mountains, Yunnan Guizhou Plateau, Sichuan Basin, Jiangnan Hills, and the plains of the middle and lower reaches of the Yangtze River. The YRB can be divided into three geographical climate regions: the Qinghai Tibet high cold region in the west, the tropical monsoon climate region in the southwest, and the subtropical monsoon climate region [33]. The main stream length of the Yangtze River is 6397 km, with a total basin area of about 1.8 million km 2 , accounting for 18.8% of China's land area.…”

Section: Study Areamentioning

confidence: 99%

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Zeng

et al. 2021

Remote Sensing

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The spatiotemporal characteristics of river water quality are the key indicators for ecosystem health evaluation in basins. Land use patterns, as one of the main driving forces of water quality change, affect stream water quality differently with the variations in the spatiotemporal scales. Thus, quantitative analysis of the relationship between different land cover types and river water quality contributes to a better understanding of the effects of land cover on water quality, the landscape planning of water quality protection, and integrated water resources management. Based on water quality data of 2006–2018 at 18 typical water quality stations in the Yangtze River basin, this study analyzed the spatial and temporal variation characteristics of water quality by using the single-factor water quality identification index through statistical analysis. Furthermore, the Spearman correlation analysis method was adopted to quantify the spatial-scale and temporal-scale effects of various land uses, including agricultural land (AL), forest land (FL), grassland (GL), water area (WA), and construction land (CL), on the stream water quality of dissolved oxygen (DO), chemical oxygen demand (CODMn), and ammonia (NH3-N). The results showed that (1) in terms of temporal variation, the water quality of the river has improved significantly and the tributaries have improved more than the main rivers; (2) in the spatial variation respect, the water quality pollutants in the tributaries are significantly higher than those in the main stream, and the concentration of pollutants increases with the decrease of the distance from the estuary; and (3) the correlation between DO and land use is low, while that between NH3-N, CODMn, and land use is high. CL and AL have a negative effect on water quality, while FL and GL have a purifying effect on water quality. In particular, AL and CL have a significant positive correlation with pollutants in water. Compared with NH3-N, CODMn has a higher correlation with land use at a larger scale. The results highlight the spatial scale and seasonal dependence of land use on water quality, which can provide a scientific basis for land management and seasonal pollution control.

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Section: Study Areamentioning

confidence: 99%

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Zeng

et al. 2021

Remote Sensing

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“…Overfishing, water pollution and habitat fragmentation were also proven to be the vital threat to this species [ 51 ]. Consequently, most of the small lakes nearly disappeared and the mid-large lakes shrank considerably resulting in unsuitable habitat for this species [ 52 , 53 ]. At the moment, no specific protection action has been taken for N. taihuensis , so it is urgent to make an effective plan to protect this economically and ecological important species.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Genetic Diversity of the Salangid, Neosalanx taihuensis, Based on the Mitochondrial COI Gene in Different Chinese River Basins

Fang

Ren

et al. 2022

Biology

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The salangid Neosalanx taihuensis (Salangidae) is a commercially important economical fish endemic to China and restricted to large freshwater systems with a wide-ranging distribution. This fish species has continuous distribution ranges and a long-introduced aquaculture history in Chinese basins. However, the research on its population genetic differentiation within and between basins is very limited. In this regard, 197 individuals were sampled from 11 populations in the Nenjiang River Basin (A1–A4), Songhua River Basin (B1), Yellow River Basin (C1–C2), Yangtze River Basin (D1), Lanchang River Basin (E1–E2) and Huaihe River Basin (F1). Based on the COI sequence, the N. taihuensis population’s genetic difference within and between river basins was investigated. The haplotypes and their frequency distributions were strongly skewed, with most haplotypes (n = 13) represented only in single samples each and thus restricted to a single population. The most common haplotype (H4, 67/197) was found in all individuals. The analysis of molecular variance (AMOVA) revealed a random pattern in the distribution of genetic diversity, which is inconsistent with contemporary hydrological structure. The mismatch between the distribution and neutrality tests supported the evidence of a population expansion, which occurred during the late Pleistocene (0.041–0.051 million years ago). Significant levels of genetic subdivision were detected among populations within basins rather than between the six basins. Population history dynamics showed that N. taihuensis experienced an expansion during the glacial period in the late Pleistocene. Therefore, different populations should be considered as different management units to achieve effective conservation and management purposes. These results have great significance for the evaluation and exploitation of the germplasm resources of N. taihuensis.

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“…The Yangtze River in China ranks fifth in the world in terms of water discharge and fourth in sediment runoff, and its watershed is the third largest river basin in the world (Li et al, 2020). Its main stream and vast tributaries yield diverse natural conditions and abundant biodiversity, including more than 400 species of fish as determined from historical records (Chen et al, 2020). However, under the combined influence of high‐intensity human activities, especially the construction of dams and overfishing, sensitivity of fisheries in the Yangtze River ranks third in the world, behind the Mekong and Ganges (Zhang et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Potential spawning grounds of phytophilic fish under a shifting hydrological regime in Poyang Lake, China

Dai

Liu

et al. 2022

Fisheries Management Eco

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The quality and effectiveness of fish spawning grounds are of great significance to the conservation of freshwater systems, and the distribution of spawning grounds is critical to clearly identify. This study combines a hydrodynamic model and satellite imagery to determine potential spawning grounds in the largest freshwater lake in China. Results revealed that the increase in vegetation in Poyang Lake led to an expansion of potential spawning grounds towards the centre of the lake due to a water level decrease since 2000. The mean spawning grounds area in Poyang Lake declined from 482.51 to 814.40 km2 after 2005 and average bathymetry decreased from 12.29 to 10.49 m. The current nature reserve holds 18.26% of the total spawning grounds, while sub‐lakes hold 34.02% of the total. The constant area of spawning grounds under typical scenarios should be the baseline for future conservation.

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Threats and protection policies of the aquatic biodiversity in the Yangtze River

Cited by 69 publications

References 32 publications

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Spatiotemporal Characteristics of the Water Quality and Its Multiscale Relationship with Land Use in the Yangtze River Basin

Assessment of Genetic Diversity of the Salangid, Neosalanx taihuensis, Based on the Mitochondrial COI Gene in Different Chinese River Basins

Potential spawning grounds of phytophilic fish under a shifting hydrological regime in Poyang Lake, China

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