scholarly journals Impact of coastal environmental factors on quinolone distribution in intertidal surface sediments of the Bohai Sea and Yellow Sea, China

2018 ◽  
Vol 19 (2) ◽  
pp. 482-491
Author(s):  
Hang Lang ◽  
Liang Chen ◽  
Guohua Hou ◽  
Wenjuan Wang ◽  
Shengzhang Zou ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Yellow Sea ◽  
Surface Sediments ◽  
Oxolinic Acid ◽  
Intertidal Sediment ◽  
Organic Carbon Content ◽  
Intertidal Sediments ◽  
Intertidal Zones ◽  
Sediment Types ◽  
Intertidal Surface

Abstract Freshwater contaminants tend to precipitate into intertidal surface sediments, particularly in the estuary and intertidal zones during freshwater–seawater mixing. Quinolone-type antibiotics are such contaminants, and their concentrations in the intertidal sediments are important indicators for the whole spectrum of antibiotics used in the estuary and adjacent areas. The impacts of sediment types and environmental factors on the distribution of 16 quinolones were probed based on nine Bohai and 42 Yellow Sea intertidal sediment samples. The samples were collected from locations along the coastal areas in China. Quinolones were detected in all samples, while moxifloxacin, ciprofloxacin, and ofloxacin were detected at a frequency >50%. Sediment types, pH, organic carbon content, K, Na and Fe concentrations had little correlation with quinolone distributions in intertidal sediments. However, combined concentrations of Ca + Mg (46.7 g/kg in Bohai and 13.7 g/kg in Yellow Sea samples) appeared to correlate with oxolinic acid detecting frequencies (88.9% and 4.8%, respectively) and concentrations (2.0–10.1 μg/g and up to 3.09 μg/g, respectively). Different detection frequencies of the quinolones could be attributed to the formation of cation bridges between oxolinic acid and Ca + Mg, which results in dominant sorption of oxolinic acid at different locations and sediment matrices.

DISTRIBUTION PATTERN OF CLAY MINERALS IN SURFACE SEDIMENTS OF SOUTH YELLOW SEA AND THEIR PROVENANCE

2011 ◽  
Vol 31 (3) ◽  
pp. 11-16 ◽  
Author(s):  
Xianhong LAN ◽  
Xianjun ZHANG ◽  
Xinbo LIU ◽  
Rihui LI ◽  
Zhixun ZHANG
Keyword(s):  
Distribution Pattern ◽  
Clay Minerals ◽  
Yellow Sea ◽  
Surface Sediments ◽  
South Yellow Sea

Multi-residues of organic pollutants in surface sediments from littoral areas of the Yellow Sea, China

2008 ◽  
Vol 56 (6) ◽  
pp. 1091-1103 ◽  
Author(s):  
WenXin Liu ◽  
JiangLin Chen ◽  
Jing Hu ◽  
Xi Ling ◽  
Shu Tao
Keyword(s):  
Organic Pollutants ◽  
Yellow Sea ◽  
Surface Sediments ◽  
The Yellow Sea

scholarly journals Speciation Variation and Comprehensive Risk Assessment of Metal(loid)s in Surface Sediments of Intertidal Zones

2018 ◽  
Vol 15 (10) ◽  
pp. 2125 ◽  
Author(s):  
Baocui Liang ◽  
Xiao Qian ◽  
Shitao Peng ◽  
Xinhui Liu ◽  
Lili Bai ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Surface Sediments ◽  
Yellow River ◽  
Biological Effects ◽  
Risk Index ◽  
Sediment Quality ◽  
Residual Fraction ◽  
Intertidal Zones ◽  
Probable Effect Level ◽  
Effect Level

Speciation variation and comprehensive risk assessment of metal(loid)s (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were investigated in surface sediments from the intertidal zones of the Yellow River Delta, China. Results showed that only the concentrations of As, Cd and Pb were significantly different between April and September (p < 0.01). In April, the residual fraction (F4) was predominant for As, Cr, Cu, Ni and Zn. However, the exchangeable and carbonate-associated fraction (F1) was dominant for Cd averaging 49.14% indicating a high environmental risk. In September, the F4 fraction was predominant and the F1 fraction was very low for most metal(loid)s except Cd and Mn. The geo-accumulation index (Igeo), the F1 fraction and potential ecological risk index (PERI) of most metal(loid)s were relatively low in surface sediments for both seasons. But Pb, As and Ni were between the threshold effect level (TEL)and the probable effect level (PEL) for 66.67%, 83.33% and 91.67% in April and As and Ni were between TEL and PEL for 41.67% and 91.67%, which indicated that the concentration of them was likely to occasionally exhibit adverse effects on the ecosystem. Although the Igeo, the F1 fraction or PERI of Cd in both seasons was higher at some sites, the results of sediment quality guidelines (SQGs) indicated that the biological effects of Cd were rarely observed in the studied area.

scholarly journals Summer and winter living coccolithophores in the Yellow Sea and the East China Sea

2014 ◽  
Vol 11 (3) ◽  
pp. 779-806 ◽  
Author(s):  
J. Sun ◽  
X. Y. Gu ◽  
Y. Y. Feng ◽  
S. F. Jin ◽  
W. S. Jiang ◽  
...  
Keyword(s):  
Surface Layer ◽  
Environmental Factors ◽  
East China Sea ◽  
Correspondence Analysis ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Living Coccolithophores

Abstract. This paper describes the distribution of living coccolithophores (LCs) in the Yellow Sea and the East China Sea in summer and winter, and its relationship with environmental factors by canonical correspondence analysis (CCA). We carried out a series of investigations on LCs distribution in the Yellow Sea and the East China Sea in July and December 2011. 210 samples from different depths were collected from 44 stations in summer and 217 samples were collected from 45 stations in winter. Totally 20 taxa belonging to coccolithophyceae were identified using a polarized microscope at the 1000 × magnification. The dominant species of the two seasons were Gephyrocapsa oceanica, Emiliania huxleyi, Helicosphaera carteri, and Algirosphaera robusta. In summer the abundance of coccolithophore cells and coccoliths ranged 0–176.40 cells mL−1, and 0–2144.98 coccoliths mL−1, with the average values of 8.45 cells mL−1, and 265.42 coccoliths mL−1, respectively. And in winter the abundance of cells and coccoliths ranged 0–71.66 cells mL−1, and 0–4698.99 coccoliths mL−1, with the average values of 13.91 cells mL−1 and 872.56 coccoliths mL−1, respectively. In summer, the LCs in surface layer were mainly observed on the coastal belt and southern part of the survey area. In winter, the LCs in surface layer had high value in the continental shelf area of section P. The comparison among section A, section F, section P and section E indicated lower species diversity and less abundance in the Yellow Sea than those in the East China Sea in both seasons. Temperature and the nitrate concentration may be the major environmental factors controlling the distribution and species composition of LCs in the studying area based on CCA. Abbreviations: LCs: Living Coccolithophores; CCA: canonical correspondence analysis; DCM: Deep Chlorophyll Maximum

scholarly journals Response of stream ecosystem function and structure to sediment metal: Context-dependency and variation among endpoints

Elem Sci Anth ◽  
2014 ◽  
Vol 2 ◽  
Author(s):  
David M. Costello ◽  
G. Allen Burton
Keyword(s):  
Dose Response ◽  
Environmental Context ◽  
Context Dependency ◽  
Acid Volatile Sulfide ◽  
Sediment Type ◽  
Organic Carbon Content ◽  
Ecological Context ◽  
Sediment Types ◽  
Sediment Metals ◽  
Sediment Metal

Abstract Physicochemical and ecological attributes of ecosystems (i.e., environmental context) can modify the exposure and effects of metals, which presents a challenge for ecosystem management. Furthermore, the functional and structural attributes of an ecosystem may not respond equally to metals or be uniformly responsive to environmental context. We explored how physicochemical and ecological context modified sediment metal dose-response for a suite of functional and structural measures. Two sediments with high (HB) and low (LB) acid volatile sulfide and organic carbon content (i.e., physicochemical context) were amended with copper and nickel to establish a gradient of treatments from non-toxic to potentially toxic. Sediments were deployed in each of two streams (i.e., ecological context), incubated for four weeks, and measured for sediment microbe, biofilm, and macroinvertebrate dose-response to metal. The dose-response of microbial function was affected by physicochemical context, with cotton decomposition negatively related to sediment metal only on LB sediments. The abundance of invertebrates from the orders Ephemeroptera, Plecoptera, and Trichoptera (EPT) responded negatively to sediment metal only on LB sediments; however, this dose-response was only observed in one stream, likely because of greater abundance of sensitive EPT taxa (i.e., Baetidae and Ephemerellidae). Biofilm structure was negatively affected by sediment metal in only one stream and there was no difference in dose-response between the two sediment types. Biofilm function was affected by sediment type and stream; production by biofilms exposed to HB sediment was negatively related to sediment metal in only one stream. In all, the majority of our endpoints exhibited responses that were modified by environmental context; however, each component of the ecosystem exhibited unique context dependency. For management of sediment metals, an understanding of context dependency is useful for informed decision-making, but the application of simple contextual filters are unlikely to protect all elements of an ecosystem.

scholarly journals Microplastic pollution in the surface sediments collected from Sishili Bay, North Yellow Sea, China

2019 ◽  
Vol 141 ◽  
pp. 9-15 ◽  
Author(s):  
Bin Zhang ◽  
Di Wu ◽  
Xin Yang ◽  
Jia Teng ◽  
Yongliang Liu ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Surface Sediments ◽  
North Yellow Sea

Characterization of the development stages and roles of nutrients and other environmental factors in green tides in the Southern Yellow Sea, China

Harmful Algae ◽  
2020 ◽  
Vol 98 ◽  
pp. 101893
Author(s):  
Haibo Zhang ◽  
Guoshan Wang ◽  
Chuansong Zhang ◽  
Rongguo Su ◽  
Xiaoyong Shi ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Yellow Sea ◽  
Southern Yellow Sea ◽  
Green Tides ◽  
Development Stages ◽  
The Southern Yellow Sea
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