Seasonal variation of microplastics in seawater and zooplankton in Jiaozhou Bay, the Yellow Sea

2020 ◽  
Author(s):  
Xiaoxia Sun
Keyword(s):  
Seasonal Variation ◽  
Chemical Composition ◽  
Surface Water ◽  
Yellow Sea ◽  
Jiaozhou Bay ◽  
Coastal Areas ◽  
Average Concentration ◽  
The Yellow Sea ◽  
Plastic Pollution ◽  
Four Seasons

<p>Plastic pollution is a globally concerning issue in marine environments. There is currently little research about the seasonal changes in microplastics in coastal areas. Here, we report a seasonal study on the concentrations and characteristics of microplastics in the surface seawater and zooplankton of Jiaozhou Bay, a typical bay in the west Yellow Sea. The concentrations of microplastics in the surface water of Jiaozhou Bay were 0.063, 0.174, 0.094, and 0.050 pieces/m<sup>3 </sup>in February, May, August and November, respectively, with an annual average concentration of 0.095 pieces/m<sup>3</sup>, a low value compared with the plastic concentrations of other coastal areas. The size of the collected microplastics ranged from 346 to 155200 μm, with an average of 5093 μm. The overall percentages of fibers, fragments and plastic foams were 29%, 55% and 16%, respectively. Fragments were the most dominant shape in four seasons. Nine plastic polymers were detected from the surface water of Jiaozhou Bay. The dominant chemical composition was polypropylene (PP), accounting for 51.04% of polymers, followed by polyethylene (PE), accounting for 26.04% of polymers. The seasonal variation of plastic characteristics in Jiaozhou Bay, including the shape, color and chemical composition, was significant. The highest concentration of plastics occurred in May and the lowest concentration of plastics occurred in November. Strong rainfall resulted in an increase in the plastic concentration in May, and winds and eddies affected the spatial distribution of plastics in Jiaozhou Bay. Focused on the dominant zooplankton groups in Jiaozhou Bay, the morphology, color, size, chemical composition and quantity of MPs in zooplankton were investigated in Jiaozhou Bay. The results showed that the MPs in zooplankton of the Jiaozhou Bay were dominated by fibers. The proportions of fiber in February, May, August and November were 91%, 88%, 89% and 88%, respectively. The average size of MPs in zooplankton was 441±2, 468±2, 576±2, and 379±4μm in the four seasons. For the 2 common zooplankton groups in the 4 seasons, the MP/zooplankton was 0.3, 0.26, 0.17, 0.19 for copepod, and 0.22, 0.19, 0.17, 0.45 for chaetognath, respectively.</p>

Seasonal variation of micro- and meso-plastics in the seawater of Jiaozhou Bay, the Yellow Sea

2020 ◽  
Vol 152 ◽  
pp. 110922 ◽  
Author(s):  
Tao Liu ◽  
Yongfang Zhao ◽  
Mingliang Zhu ◽  
Junhua Liang ◽  
Shan Zheng ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Yellow Sea ◽  
Jiaozhou Bay ◽  
The Yellow Sea

Seasonal variation of microplastics ingested by copepods in Jiaozhou Bay, the Yellow Sea

2021 ◽  
Author(s):  
Shan Zheng ◽  
Xiaoxia Sun
Keyword(s):  
Risk Assessment ◽  
Chemical Composition ◽  
Environmental Factors ◽  
Seawater Temperature ◽  
Jiaozhou Bay ◽  
The Yellow Sea ◽  
Marine Biota ◽  
Four Seasons ◽  
Increased Risk ◽  
The Impact

<p>Microplastic (MP) contamination is a growing threat to marine biota and ecosystems. As the dominant functional group of zooplankton, copepods are at an increased risk of MP ingestion. The seasonal change in MPs in copepods and the key environmental factors influencing the retention of MPs in copepods are largely unknown. For the first time, the characteristics of MPs in copepods across four seasons were studied in Jiaozhou Bay. The abundance, shape, size, and chemical composition of MPs in copepods were investigated, and the relationships between MP/copepod and key environmental factors were analyzed. The results reveal a significant seasonal difference in the MP/copepod in Jiaozhou Bay. The MP/copepod was 0.26, 0.23, 0.14 and 0.16 in February, May, August and November, respectively. The MP/copepod was significantly higher in winter and spring than in summer, which was possibly correlated with the lower temperature in winter and spring seasons. Seawater temperature was negatively correlated with the MP/copepod value. The MP/copepod in the area near the estuary was significantly higher than inside the bay. No significant seasonal differences were detected in the characteristics of MPs in copepods in Jiaozhou Bay. The size of MPs in copepods ranged from 90 to 2485 μm, with an average of 454±376 μm. Fibers are the most risky MPs in copepods, accounting for 92% of the total. In terms of the chemical composition, a total of 20 polymers were detected from copepods in Jiaozhou Bay in four seasons. The main components were polyester and cellophane. The percentages of polyester were 29.4%, 45.5%, 41.2%, and 57.1%, and those of cellophane were 52.9%, 18.2%, 11.8%, and 28.6% in February, May, August and November, respectively. By revealing the seasonal characteristics of copepods in Jiaozhou Bay, this study provided key parameters of MPs in copepods in Jiaozhou Bay and formed an important basis for further ecological risk assessment of MPs. The chronic effects of low MP retention on copepods, the impact of fibers on copepods, and the risk assessments of MPs under different environmental conditions were recommended as the research topic for the next step to achieve an environmentally relevant risk assessment.</p>

Seasonal characteristics of microplastics ingested by copepods in Jiaozhou Bay, the Yellow Sea

2021 ◽  
Vol 776 ◽  
pp. 145936
Author(s):  
Shan Zheng ◽  
Yongfang Zhao ◽  
Tao Liu ◽  
Junhua Liang ◽  
Mingliang Zhu ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Jiaozhou Bay ◽  
The Yellow Sea ◽  
Seasonal Characteristics

Steady increase in water clarity in Jiaozhou Bay in the Yellow Sea from 2000 to 2018: Observations from MODIS

2021 ◽  
Author(s):  
Ziyao Yin ◽  
Junsheng Li ◽  
Jue Huang ◽  
Shenglei Wang ◽  
Fangfang Zhang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Jiaozhou Bay ◽  
Water Clarity ◽  
The Yellow Sea ◽  
Steady Increase

Matrix bound phosphine in sediments of the yellow sea and its coastal areas

2010 ◽  
Vol 30 (7) ◽  
pp. 743-751 ◽  
Author(s):  
Jian-Bing Li ◽  
Gui-Ling Zhang ◽  
Jing Zhang ◽  
Su-Mei Liu ◽  
Jing-Ling Ren
Keyword(s):  
Yellow Sea ◽  
Coastal Areas ◽  
The Yellow Sea ◽  
Matrix Bound

Seasonal Variation of Lipid Profile of Oyster Crassostrea talienwhanensis from the Yellow Sea Area

2020 ◽  
Vol 29 (4) ◽  
pp. 360-372
Author(s):  
Yan-Fei Liu ◽  
Zi-Xuan Wu ◽  
Jing Zhang ◽  
Yu-Xin Liu ◽  
Zhong-Yuan Liu ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Lipid Profile ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
Sea Area

scholarly journals Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics at the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

2013 ◽  
Vol 10 (6) ◽  
pp. 10143-10188 ◽  
Author(s):  
Y. Umezawa ◽  
A. Yamaguchi ◽  
J. Ishizaka ◽  
T. Hasegawa ◽  
C. Yoshimizu ◽  
...  
Keyword(s):  
Surface Water ◽  
East China Sea ◽  
Yellow Sea ◽  
Cold Water ◽  
The Yellow Sea ◽  
Subsurface Water ◽  
East China ◽  
Nursery Ground ◽  
Shelf Water ◽  
China Sea

Abstract. The northern East China Sea (ECS) serves as a spawning and nursery ground for many species of fish and squid. To clarify the basis of the food web in the northern ECS, we examined the nitrate (NO3) dynamics along four latitudinal transects based on stable nitrogen and oxygen isotopes of NO3 (δ15NNO3 and δ18ONO3) and temperature-salinity dynamics in both winter (February 2009) and summer (July 2009 and July 2011). The δ15NNO3 and δ18ONO3, which were distinctly different among the potential NO3 sources, were useful for clarifying NO3 sources and its actual usage by phytoplankton. In winter, Kuroshio Subsurface Water (KSSW) and the Yellow Sea Mixed Water (YSMW) predominantly contributed to NO3 distributed in the shelf water. In the surface water of the Okinawa Trough, NO3 from the KSSW, along with a temperature increase caused by an intrusion of Kuroshio Surface Water (KSW), seemed to stimulate phytoplankton growth. In summer, Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and KSSW affected the distribution and abundance of NO3 in the northern ECS, depending on precipitation in the Changjiang drainage basin and the development of the YSCWM in the shelf bottom water. Isotopic fractionation during NO3 uptake by phytoplankton seemed to drastically change δ15NNO3 and δ18ONO3, which may indirectly indicate the amount of primary production. And δ15NNO3-ln([NO3]) dynamics and relatively lighter δ15NNO3 suggested that atmospheric nitrogen and nitrification may have contributed to NO3 dynamics, too, in surface and subsurface layers, respectively, during summer, suggesting a tightly coupled nitrogen cycle in the shelf water of the northern ECS.

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