scholarly journals Resource contribution rate assessment of stock enhancement of silver carp, Hypophthalmichthy smolitrix in Jiangsu section of the Yangtze River based on microsatellite markers

2020 ◽  
Vol 32 (4) ◽  
pp. 1154-1164
Author(s):  
YANG Xiwen ◽  
◽  
LIU Yi ◽  
XUE Xiangping ◽  
WANG Xingyan ◽  
...  
Keyword(s):  
Microsatellite Markers ◽  
Yangtze River ◽  
Silver Carp ◽  
Stock Enhancement ◽  
The Yangtze River ◽  
Contribution Rate ◽  
Resource Contribution

Fishery Resources, Environment, and Conservation in the Mississippi and Yangtze (Changjiang) River Basins

2016 ◽  
Keyword(s):  
Water Quality ◽  
Mississippi River ◽  
Yangtze River ◽  
Silver Carp ◽  
River Basins ◽  
Bighead Carp ◽  
The Yangtze River ◽  
Changjiang River ◽  
Hypophthalmichthys Nobilis ◽  
Anthropogenic Modifications

<em>Abstract</em>.—Bighead Carp <em>Hypophthalmichthys nobilis </em>and Silver Carp <em>H. molitrix </em>are native in the Yangtze River and extremely important economically and culturally as food fishes; however, the two species have declined due to overfishing and anthropogenic modifications to hydrology and water quality. Bighead Carp and Silver Carp were imported to North America in the early 1970s, escaped confinement, and have now become undesirable and problematic invasive species. The two carps have become the most abundant fish species in many portions of their invaded range, which continues to expand. We compare the biology, status, and management of these species between their natal range in the Yangtze River and their invaded habitats of the Mississippi River basin.

Evaluation of genetic diversity and population structure of five yellow catfish Pelteobagrus fulvidraco populations by microsatellite markers

2018 ◽  
Vol 47 (2) ◽  
pp. 99-106 ◽  
Author(s):  
Liqiang Zhong ◽  
Minghua Wang ◽  
Jianlin Pan ◽  
Daming Li ◽  
Shengkai Tang ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Microsatellite Markers ◽  
Yangtze River ◽  
Geographic Distance ◽  
Pelteobagrus Fulvidraco ◽  
Freshwater Species ◽  
The Yangtze River ◽  
Stock Management ◽  
Yellow Catfish ◽  
Wild Stock

Abstract Yellow catfish, Pelteobagrus fulvidraco, is an important commercial freshwater species in China. Knowledge about the genetic diversity of the yellow catfish is important to support the management and conservation programs, which would subsequently support the sustainable production of this species. To investigate the genetic diversity and the structure of yellow catfish in the middle and lower reaches of the Yangtze River, 125 individuals from five lakes were genotyped using 13 microsatellite markers. Moderate genetic diversity was determined in all populations, with the observed heterozygosity (HO) ranging from 0.42 to 0.49 and the expected heterozygosity (HE) ranging from 0.51 to 0.61. Low to moderate genetic differentiation among the populations was revealed from pairwise FST values (p < 0.05), as well as from analysis of molecular variance (AMOVA). The UPGMA dendrogram and Bayesian clustering analysis indicated a correlation between genetic differences and geographic distance – four populations from the lower reaches clustered together, whereas the Poyang Lake (PY) population formed a separate cluster. The present study would be helpful in the wild stock management and artificial propagation programs for yellow catfish in the middle and lower reaches of the Yangtze River.

Mitochondrial DNA diversity, population structure, and conservation genetics of four native carps within the Yangtze River, China

1997 ◽  
Vol 54 (1) ◽  
pp. 47-58 ◽  
Author(s):  
G Lu ◽  
S Li ◽  
L Bernatchez
Keyword(s):  
Mitochondrial Dna ◽  
Population Structure ◽  
Grass Carp ◽  
Yangtze River ◽  
Juvenile Fish ◽  
Silver Carp ◽  
Bighead Carp ◽  
The Yangtze River ◽  
Black Carp ◽  
Dna Diversity

Silver carp (Hypophthalmichthys molitrix), grass carp (Ctenopharyngodon piceus), bighead carp (Aristichthys nobilis), and black carp(Mylopharyngodon piceus) rank first, second, fourth, and seventh in world fish production. In China, the Yangtze River harbours the most important natural populations of these species. We performed a polymerase chain reaction - restriction fragment length poymorphism analysis on 365 juvenile fish representing three nursery grounds to provide a first assessment of the mitochondrial DNA diversity in these species and test the hypothesis that they are composed of more than one genetic stock. The mitochondrial DNA diversity was high in silver, bighead, and black carp, and much less in grass carp. Analysis of heterogeneity of genotype frequency, fixation indices, intersite molecular variance, and localization indices indicated that juvenile silver, bighead, and black carp from different nursery areas belong to genetically distinct populations. These results suggest that their population structure may be determined by the number of environmental settings that permit closure of their life cycle. They also imply that carp from the Yangtze River cannot be managed as a single unit and that human disturbance through exploitation and habitat modifications, in particular the construction of the Three Gorges Dam, will have differential impacts on fish abundance for different parts of the river.

scholarly journals Distinguishing the Relative Contribution of Environmental Factors to Runoff Change in the Headwaters of the Yangtze River

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1432 ◽  
Author(s):  
Mengjing Guo ◽  
Jing Li ◽  
Yongsheng Wang ◽  
Peng Bai ◽  
Jiawei Wang
Keyword(s):  
Environmental Factors ◽  
Yangtze River ◽  
Water Resource Management ◽  
Water Yield ◽  
The Yangtze River ◽  
Contribution Rate ◽  
The Past ◽  
Relative Contribution ◽  
Runoff Change ◽  
Basin Scale

The change in river flows at the basin scale reflects the combined influences of changes in various environmental factors associated with climatic and underlying surface properties. Distinguishing the relative contribution of each of these factors to runoff change is critical for sustainable water resource management, but it is also challenging. The headstream region of the Yangtze River, known as “China’s Water Tower”, has undergone a significant runoff change over the past decades. However, the relative contribution of environmental factors to runoff change is still unclear. Here, we designed a series of detrending experiments based on a grid-based hydrological model to quantify the combined influences of multiple environmental factors on runoff change and the relative contribution of an individual factor to runoff change. The results indicate that changes in climate and vegetation significantly increased water yield in the study basin over the past three decades, and the increase in water yield primarily came from the contribution from the upstream of the basin. On the basin scale, the change in precipitation dominated the runoff change that contributed up to 113.2% of the runoff change, followed by the wind speed change with a contribution rate of −15.1%. Other factors, including changes in temperature, relative humidity, sunshine duration (as a surrogate for net radiation), and albedo (as a surrogate for vegetation) had limited effects on runoff change, and the contribution rate of these factors to runoff change ranged from −5% to 5%. On spatial patterns, the influences of changes in some environmental factors on runoff changes were affected by elevation, particularly for temperature. The rising temperature had mixed effects on runoff change, which generally increased water yield at high altitudes of the basin but decreased water yield at low altitudes of the basin.

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