scholarly journals Mangrove Soil-Borne Trace Elements in Qi’ao Island: Implications for Understanding Terrestrial Input of Trace Elements into Part of the Pearl River Estuary

2020 ◽  
Vol 10 (7) ◽  
pp. 2439 ◽  
Author(s):  
Anyi Niu ◽  
Jiaojiao Ma ◽  
Yifei Gao ◽  
Songjun Xu ◽  
Chuxia Lin
Keyword(s):  
Trace Elements ◽  
Ecological Risk ◽  
Risk Index ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
Sampling Locations ◽  
Qi’Ao Island ◽  
The Pearl River

An investigation was conducted to characterize the trace element status of mangrove soils of Qi’ao Island in the Pearl River estuary. The results show that the spatial variation in the soil-borne trace elements in the investigated area was minor and most of the trace elements were at a level higher than those in other mangrove wetlands around the world, suggesting the mangrove soils of Qi’ao Island were heavily contaminated by trace elements transported from the Pearl River in the past two decades. Zn was closely related to Pb, Cu, Cd, and As, while some trace elements were not closely related to each other, indicating that they were derived from different sources. An integrated Nemerow pollution index of the surface soils at the 17 sampling locations ranged from 7.53 to 48.42, values which all fall within the highest pollution category. Among the 17 sampling locations, six locations had an ecological risk index (ERI) greater than 300, and 12 locations had an Ecological Risk Index (ERI) greater than 600, indicating that most of the investigated locations were at high or very high ecological risk. The findings obtained from this study have implications for understanding the terrestrial inputs of trace elements into part of the Pearl River estuary. This understanding can be used to guide the development of management strategies for controlling the discharges of trace elements from the catchment area and managing the aquatic ecosystems in the Pearl River Estuary.

Preliminary evaluation of ecological risk for the city area from the Pearl River Estuary

2014 ◽  
Vol 70 (10) ◽  
pp. 1648-1655 ◽  
Author(s):  
Qiuying Chen ◽  
KinChung Ho ◽  
Jingling Liu
Keyword(s):  
Relative Risk ◽  
Ecological Risk ◽  
Water Environment ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Risk Scores ◽  
Pearl River ◽  
Total Risk ◽  
The Pearl River Estuary ◽  
The Pearl River

It is essential to evaluate the ecological risk for the estuary cities area for the environmental restoration of the estuary. The ecological risk of six city areas from the Pearl River Estuary were evaluated by using the relative risk model. The relative risk assessment method was developed by considering the river network density in the sub-region. The results indicated that Dongguan had the largest ecological risk pressure with total risk scores as high as 10,846.3, and Hong Kong had the lowest ecological risk pressure with total risk scores up to 4,104.6. The greatest source was domestic sewage with total risk scores as high as 1,798.6, followed by urbanization and industry. Oxygen-consuming organic pollutants, organic toxic pollutants and nutrients were the major stressors of the water environment. In terms of habitats, the water environment was enduring the greatest pressure. For the endpoints, water deterioration faced the largest risk pressure.

Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi’ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella

Zootaxa ◽  
2011 ◽  
Vol 3051 (1) ◽  
pp. 41 ◽  
Author(s):  
NAN WEI ◽  
WILLEM H. DE SMET ◽  
RUNLIN XU1
Keyword(s):  
Brackish Water ◽  
Southern China ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Tidal River ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
Qi’Ao Island ◽  
The Pearl River ◽  
Brackish Water Species

Two new species of the rotifer genus Testudinella (Rotifera, Monogononta, Testudinellidae), T. pseudobscura sp. nov. and T. quadrilobata sp. nov., are described from the intertidal zone of a brackish-water tidal river and a mangrove swamp on Qi’ao Island in the Pearl River estuary, Guangdong province, southern China. Both species belong to T. clypeata (Müller, 1786)—T. obscura Althaus, 1957 group on account of possessing a proximal fulcrum opening, a slit-like foot opening and living in thalassic waters. The trophi of Testudinella zhujiangensis Wei, De Smet & Xu, 2010 are redescribed, and a key to the marine and brackish-water Testudinella species know to date is presented.

Description of Lecane yatseni sp. n. (Rotifera: Monogononta: Lecanidae) from China

Biologia ◽  
2010 ◽  
Vol 65 (3) ◽  
Author(s):  
Nan Wei ◽  
Runlin Xu
Keyword(s):  
River Estuary ◽  
Guangdong Province ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Artificial Lake ◽  
The Pearl River Estuary ◽  
Qi’Ao Island ◽  
The Pearl River

AbstractLecane yatseni sp. n., collected from the littoral of an artificial lake on Qi’ao island of the Pearl River estuary, Guangdong province, south of China, is described and figured. It is closely related to one of the commonest species of the genus, Lecane luna, resembling Lecane papuana, but distinguished by the presence of inwardly curved aculeated anterolateral spines and broad-based spine-formed projections close to the middle of the ventral head aperture margin.

Effects of climate change and fishing on the Pearl River Estuary ecosystem and fisheries

2019 ◽  
Vol 29 (4) ◽  
pp. 861-875
Author(s):  
Zeyu Zeng ◽  
William W. L. Cheung ◽  
Shiyu Li ◽  
Jiatang Hu ◽  
Ying Wang
Keyword(s):  
Climate Change ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
The Pearl River

scholarly journals The Role of Environmental Factors on the Fishery Catch of the Squid Uroteuthis chinensis in the Pearl River Estuary, China

2021 ◽  
Vol 9 (2) ◽  
pp. 131
Author(s):  
Dongliang Wang ◽  
Lijun Yao ◽  
Jing Yu ◽  
Pimao Chen
Keyword(s):  
River Estuary ◽  
Pearl River Estuary ◽  
Sea Surface ◽  
Spatiotemporal Variability ◽  
Pearl River ◽  
Coastal Current ◽  
Catch Per Unit Effort ◽  
Chl A ◽  
The Pearl River Estuary ◽  
The Pearl River

The Pearl River Estuary (PRE) is one of the major fishing grounds for the squid Uroteuthis chinensis. Taking that into consideration, this study analyzes the environmental effects on the spatiotemporal variability of U. chinensis in the PRE, on the basis of the Generalized Additive Model (GAM) and Clustering Fishing Tactics (CFT), using satellite and in situ observations. Results show that 63.1% of the total variation in U. chinensis Catch Per Unit Effort (CPUE) in the PRE could be explained by looking into outside factors. The most important one was the interaction of sea surface temperature (SST) and month, with a contribution of 26.7%, followed by the interaction effect of depth and month, fishermen’s fishing tactics, sea surface salinity (SSS), chlorophyll a concentration (Chl a), and year, with contributions of 12.8%, 8.5%, 7.7%, 4.0%, and 3.1%, respectively. In summary, U. chinensis in the PRE was mainly distributed over areas with an SST of 22–29 °C, SSS of 32.5–34‰, Chl a of 0–0.3 mg × m−3, and water depth of 40–140 m. The distribution of U. chinensis in the PRE was affected by the western Guangdong coastal current, distribution of marine primary productivity, and variation of habitat conditions. Lower stock of U. chinensis in the PRE was connected with La Niña in 2008.

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