scholarly journals Seasonal Population Structure of the Copepod Temora turbinata (Dana, 1849) in the Kuroshio Current Edge, Southeastern East China Sea

2021 ◽  
Vol 11 (16) ◽  
pp. 7545
Author(s):  
Yan-Guo Wang ◽  
Li-Chun Tseng ◽  
Bing-Peng Xing ◽  
Rou-Xin Sun ◽  
Xiao-Yin Chen ◽  
...  
Keyword(s):  
Sex Ratio ◽  
East China Sea ◽  
Sea Water ◽  
Seawater Temperature ◽  
East China ◽  
Northwest Pacific ◽  
Coastal Current ◽  
Northwest Pacific Ocean ◽  
China Sea ◽  
Average Abundance

The abundance of adult males, females, and copepodites, and sex ratio of a Temora turbinata population and seawater hydrology were studied from 2018 to 2019 in waters off northeast Taiwan, northwest Pacific Ocean. The hydrological parameters showed significant differences between sampling months caused by interactions of Kuroshio, East China Sea water, and the China Coastal Current. The highest average abundance was recorded from the June 2018 cruise with 2903.92 ± 3499.47 (inds. m−3), followed by a cruise in June 2019 with an average abundance of 1990.64 ± 1401.55 (inds. m−3). The sex ratio ranged between 0.25 and 2.33; the records were significantly higher in samples of June 2018 than during other sampling cruises (one-way ANOVA). The spatiotemporal distribution of T. turbinata showed a clear pattern of seasonal changes among sampling stations and distribution zones. Abundance of females and copepodites correlated significantly positive (r = 0.755, p < 0.001), whereas sex ratio (r = 0.247, p = 0.119) did not correlate significantly. The present study revealed that the abundance of T. turbinate was highest in June and was positively correlated with seawater temperature; furthermore, this is the first time the in situ sex ratio of T. turbinata in western Pacific waters has been reported.

The Annual Variations of Major Nutrients and Assessments about Environmental Impacts of Xiangshan Bay East China Sea

2013 ◽  
Vol 316-317 ◽  
pp. 395-399
Author(s):  
Gen Hai Zhu ◽  
Jian Qian ◽  
Li Hong Chen ◽  
Mao Jin ◽  
Jing Jing Liu ◽  
...  
Keyword(s):  
East China Sea ◽  
Sea Water ◽  
Inorganic Nitrogen ◽  
Inorganic Phosphorus ◽  
East China ◽  
Nitrogen And Phosphorus ◽  
China Sea ◽  
Annual Variations ◽  
Xiangshan Bay ◽  
Major Nutrients

The 30 years’ annual variations of major nutrients dissolved inorganic nitrogen(DIN) and dissolved inorganic phosphorus(DIP) in Xiangshan Bay East China Sea between 1982 and 2011 were reported. The results showed that the concentrations of nitrogen and phosphorus nutrients increased year by year, consistent with the trend of nitrogen and phosphorus consumption in our country. Inorganic nitrogen was the main pollutant, then was inorganic phosphorus in Xiangshan harbor. The annual average change of DIN ranged from 0.21 to 0.76 mg∙dm-3 while DIP ranged from 0.018 to 0.054 mg∙dm-3. And the change trend of DIN and DIP was as following: winter > autumn > summer > spring. The DIN and DIP in Xiangshan horbor exceeded the standard limits greatly, the water quality in culture areas exceeded national criteria for sea water Level IV and most water qualities were inferior Level IV.

Indicator species and seasonal succession of planktonic copepod assemblages driven by the interplay of subtropical and temperate waters in the southern East China Sea

Crustaceana ◽  
2015 ◽  
Vol 88 (1) ◽  
pp. 96-112 ◽  
Author(s):  
Li-Chun Tseng ◽  
Jia-Jang Hung ◽  
Juan Carlos Molinero ◽  
Qing-Chao Chen ◽  
Jiang-Shiou Hwang
Keyword(s):  
East China Sea ◽  
Sea Water ◽  
Seasonal Succession ◽  
Kuroshio Current ◽  
East China ◽  
China Sea ◽  
Marine Diversity ◽  
Southern East China Sea ◽  
Northern Taiwan ◽  
Taiwan Region

The northeastern region off Taiwan exhibits a high marine diversity favoured by the influence of northern and subtropical water masses driven by the East China Sea Water and the Kuroshio current (KC), respectively. A total of 87 species of copepods representing 36 genera were identified in present study. Calanoida was the most dominant order, while Temora turbinata (Dana, 1849), Paracalanus parvus (Claus, 1863) and Ditrichocorycaeus affinis (McMurrich, 1916) appeared as most dominant species. However, we noticed the unusual presence of the copepod Calanoides philippinensis Kitou & Tanaka, 1969 in concurrence with the dominant influence of KC, which suggests a larger intrusion of South China Sea (SCS) waters into the northeast Taiwan region. C. philippinensis is an exclusive species of the warm subtropical Pacific waters. Its presence in the northern Taiwan region may reflect a larger intrusion of warm SCS waters. We therefore suggest its potential use as a bioindicator of southern, tropical waters in the northern Taiwan area.

scholarly journals Influence of hydrodynamic mixing on the distribution of dissolved organic carbon in the East China Sea and the northwest Pacific

2018 ◽  
Author(s):  
Ling Ding ◽  
Tiantian Ge ◽  
Xuchen Wang
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
East China Sea ◽  
Kuroshio Extension ◽  
Water Masses ◽  
East China ◽  
Northwest Pacific ◽  
Western Boundary ◽  
Oxygen Utilization ◽  
China Sea

Abstract. Oceanic dissolved organic carbon (DOC) is one of the largest carbon reservoirs on Earth, and its distribution and behavior play important roles in carbon cycling and biogeochemical processes in the ocean. Here, we report distribution and concentrations of DOC for water samples collected from the shelf-edge and slope regions in East China Sea (ECS) and the Kuroshio Extension (KE) in the northwestern North Pacific (NP) during two cruises in 2014–2015. Concentrations of DOC were 45–88 µM in the ECS and 35–65 µM in the KE. In addition to biological processes, the distribution of DOC is largely controlled by hydrodynamic mixing of different water masses. The intrusion of Kuroshio Current could dilute DOC concentrations at stations in the outer shelf and slope ranges of the ECS. The inverse correlation of DOC with apparent oxygen utilization (AOU) suggests that DOC oxidation only contributes 18 % of the oxygen consumption in the ECS slope waters. In contrast, concentrations of DOC in the KE were significantly lower in surface waters, and a relatively low and stable DOC level (~ 40 µM) was found in deep waters. The observed spatial variations of DOC in the upper 700 m among the stations in the KE were largely influenced by the mixing of the two water masses carried by the two major western boundary currents: Kuroshio and Oyashio that mix and form the KE. The hydrodynamic processes play important roles not only in the distribution of DOC but nutrients as well, thus could have major impact to primary production and ecosystems in the KE region.

Methane in the East China Sea water

1996 ◽  
Vol 52 (2) ◽  
pp. 221-233 ◽  
Author(s):  
Nobuo Tsurushima ◽  
Shuichi Watanabe ◽  
Shizuo Tsunogai
Keyword(s):  
East China Sea ◽  
Sea Water ◽  
East China ◽  
The East China Sea ◽  
China Sea

Coccolithophore responses to the Pacific Decadal Oscillation in the East China Sea region of the Northwest Pacific from ad 1901 to 2013

2019 ◽  
Vol 34 (4-5) ◽  
pp. 333-341 ◽  
Author(s):  
Shu Yang ◽  
Mingli Yuan ◽  
Qian Yang ◽  
Jiansheng Huang ◽  
Mengran Sun ◽  
...  
Keyword(s):  
East China Sea ◽  
Pacific Decadal Oscillation ◽  
East China ◽  
Northwest Pacific ◽  
The East China Sea ◽  
China Sea ◽  
The Pacific

Influence of the Changjiang diluted waters on the nanophytoplankton distribution in the northern East China Sea

2017 ◽  
Vol 98 (7) ◽  
pp. 1535-1545 ◽  
Author(s):  
Youngju Lee ◽  
Eun-Jin Yang ◽  
Seokhyun Youn ◽  
Joong Ki Choi
Keyword(s):  
Surface Layer ◽  
East China Sea ◽  
Nitrate Concentration ◽  
Seawater Temperature ◽  
East China ◽  
China Sea ◽  
Annual Variations ◽  
Low Salinity ◽  
Phytoplankton Distribution ◽  
Orange Fluorescence

We investigated the influence of the Changjiang diluted waters (CDW) on the distribution of nanophytoplankton (<20 µm) abundance and biomass in the northern East China Sea (ECS) during two research cruises conducted in the summers of 2010 and 2012, using flow cytometry. Each group of nanophytoplankton responded differently to the distribution of the CDW. In the surface layer,Synechococcus1 which has low orange fluorescence, a major component of summer nanophytoplankton, were more abundant under the large extension of CDW to the northern ECS in August 2010, whereas the abundance of other groups includingSynechococcus2 which has high orange fluorescence, and pico- and nano-eukaryotes (0.2–2 and 2–20 µm in diameter, respectively), dramatically increased under the small extension of CDW in August 2012. The subsurface chl-amaximum layer became more developed under the small extension of CDW, and was dominated by nano-eukaryotes. During two study periods, environmental characteristics in the CDW also showed annual variations, with higher seawater temperature, lower salinity, and higher nitrate concentration in the surface layer of the CDW in August 2010. The summer distributions ofSynechococcusand nano-eukaryotes were likely to be limited by low salinity and high temperature, respectively, indicating that phytoplankton distribution could be influenced not only by the extension level of the CDW but also by the change of the environmental characters of the CDW.

scholarly journals Inter-shelf nutrient transport from the East China Sea as a major nutrient source supporting winter primary production on the northeast South China Sea shelf

2013 ◽  
Vol 10 (12) ◽  
pp. 8159-8170 ◽  
Author(s):  
A. Q. Han ◽  
M. H. Dai ◽  
J. P. Gan ◽  
S.-J. Kao ◽  
X. Z. Zhao ◽  
...  
Keyword(s):  
South China Sea ◽  
Primary Production ◽  
East China Sea ◽  
South China ◽  
East China ◽  
Lower Latitude ◽  
Coastal Current ◽  
Northeast Monsoon ◽  
The East China Sea ◽  
China Sea

Abstract. The East China Sea (ECS) and the South China Sea (SCS) are two major marginal seas of the North Pacific with distinct seasonal variations of primary productivity. Based upon field observations covering both the ECS and the northern SCS (NSCS) during December 2008–January 2009, we examined southward long-range transport of nutrients from the ECS to the northeastern SCS (NESCS) carried by the China Coastal Current (CCC) driven by the prevailing northeast monsoon in wintertime. These escaped nutrients from the ECS shelf, where primary production (PP) was limited in winter, might however refuel the PP on the NESCS shelf at lower latitude, where the water temperature remained favorable, but river-sourced nutrients were limited. By combining the field observation of nitrate+nitrite (NO3+NO2, DIN) with our best estimate of volume transport of the CCC, we derived a first-order estimate for DIN flux of 1430 ± 1024 mol s−1. Under the assumption that DIN was the limiting nutrient, such southward DIN transport would have stimulated 8.84 ± 6.33 × 1011 gC of new production (NP), accounting for 33–74% of the NP or 14–22% of PP in winter on the NESCS shelf shallower than 100 m.

Features in REE and Methane Anomalies Distribution in the East China Sea Water Column: a Comparison with the South China Sea

2019 ◽  
Vol 46 (5) ◽  
pp. 807-816
Author(s):  
Le Duc Luong ◽  
Renat B. Shakirov ◽  
Nguyen Hoang ◽  
Ryuichi Shinjo ◽  
Anatoly Obzhirov ◽  
...  
Keyword(s):  
South China Sea ◽  
Water Column ◽  
East China Sea ◽  
South China ◽  
Sea Water ◽  
The South China Sea ◽  
East China ◽  
The East China Sea ◽  
The South ◽  
China Sea
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