scholarly journals Seasonal Shift of a Phytoplankton (>5 µm) Community in Bohai Sea and the Adjacent Yellow Sea

Diversity ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 65
Author(s):  
Xiaoting Fu ◽  
Jun Sun ◽  
Yuqiu Wei ◽  
Zishi Liu ◽  
Yehong Xin ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Bohai Sea ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Prorocentrum Minimum ◽  
Phytoplankton Diversity ◽  
The North ◽  
Scaling Analyses ◽  
Coscinodiscus Granii ◽  
Phytoplankton Group

In order to better understand the seasonal variations in the phytoplankton community structure in the Bohai Sea (BS) and the North Yellow Sea (NYS), we carried out three cruises during 12 to 24 April 2019, 8 to 18 June 2019, and 12 to 22 October 2019. A total of 212 taxa (75 genera and three phyla) were identified, among which 83 taxa in 40 genera, 96 taxa in 43 genera, and 151 taxa in 62 genera were found in spring, summer, and autumn, respectively. Diatoms including Paralia sulcata and Coscinodiscus granii were the most dominant phytoplankton group during the three seasons, while several species of dinoflagellates, e.g., Scrippsiella troichoidea, Tripos massiliensis f. armatus, Gyrodinium spirale, and Prorocentrum minimum were found in warmer, saltier, and nutrient-poor waters. The diversity index of phytoplankton community was highest in autumn and lowest in summer. Based on cluster and multidimensional scaling analyses, the phytoplankton community of the BS and the NYS was divided into three ecological provinces: the BS, the coastal area, and the NYS. These three ecological provinces differed in physicochemical properties induced by the complicated water masses and circulations. Due to the influence of nutrient concentration, the phytoplankton diversity had the highest value in autumn, followed by spring, and the smallest in summer.

scholarly journals Comparative Study on Phytoplankton Community in Two Newly Dug Ponds in Institut Teknologi Sumatera

2020 ◽  
Vol 5 (1) ◽  
pp. 63-69
Author(s):  
Hendry Wijayanti ◽  
Andy Darmawan
Keyword(s):  
Phytoplankton Community ◽  
Diversity Index ◽  
Species Abundance ◽  
Mean Value ◽  
Linear Mixed Effect Model ◽  
Reservoir Water ◽  
Mixed Effect ◽  
Algae Biomass ◽  
Phytoplankton Diversity ◽  
Wiener Diversity Index

Phytoplankton community plays an important ecological role in the aquatic ecosystems as the primary producers and forms the fundament of the aquatic food chain for supporting the water community. Thus, the phytoplankton community structure is a good indicator of water quality due to its sensitiveness to environmental stresses. Two newly dug ponds in Institut Teknologi Sumatera may give an opportunity to study the early colonizing stages of various freshwater communities including phytoplankton. The study attempted to determine the composition and abundance of phytoplankton. Samples were collected from two ponds (A and C) in the reservoir water of Institut Teknologi Sumatera. The content of Phosphorus (P), Nitrogen (N), and Chlorophyll-a (algae biomass) were determined. Phytoplankton had higher diversity in Pond C than Pond A in the study period, in which a total of seven taxa were found, namely Bacillariophycea, Cyanophyceae, Chlorophyceae, Conjugatophyceae, Dinophyceae, Euglenophyceae, Gymnodiniaceae. The most species abundance of both ponds was Peridinium sp. and Trachelomonas sp. The Pond C had the highest mean value of the Shannon-Wiener diversity index. The Linear mixed-effect model showed that low turbidity will result in high phytoplankton diversity. The finding of this study suggests that higher phytoplankton diversity would achieve a natural carrying capacity, and thus would serves as an indicator of ecosystem health.

scholarly journals Phytoplankton Diversity as Bioindicator of Pandanduri Dam Waters, East Lombok Regency

2020 ◽  
Vol 20 (3) ◽  
pp. 355
Author(s):  
Lalu Hasan Nasirudin Zohri ◽  
Agil Al Idrus ◽  
Lalu Japa
Keyword(s):  
Water Quality ◽  
Sampling Method ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Quality Change ◽  
Species Diversity Index ◽  
Phytoplankton Diversity ◽  
Essential Function ◽  
Index Value

Pandanduri Dam waters has an essential function for the community made the activities of the surrounding community inseparable from the Pandanduri Dam that made potentially quality change of the Pandanduri Dam waters. Good water quality is an important requirement for humans that made water quality research is essential to be done. Human activities will affect environmental factors such as biological parameters, especially phytoplankton, which are indicators of water quality. The aim of this study was to analyzed water quality of Pandanduri Dam through study of phytoplankton community and diversity. Sample sites were determined based on haphazard sampling method and phytoplankton data were analyzed based on the shannon-weiner diversity index. The results showed that the phytoplankton community identified in Pandanduri Dam consisted of 5 classes, 13 orders, and 31 species with  species diversity index of 2,659. Based on fitoplankton diversity index value the water of  Pandanduri Dam was in lightly polluted category. It is suggested to more detailed studies should be undertaken especially on species that produce toxins over a longer time scale.

Impact of acidification on structural organization of phytoplankton community in the forest lakes of the north-western Russia

1996 ◽  
Vol 33 (4-5) ◽  
pp. 291-296 ◽  
Author(s):  
L. G. Korneva
Keyword(s):  
Phytoplankton Community ◽  
Diversity Index ◽  
Structural Characteristics ◽  
Total Biomass ◽  
North Shore ◽  
The North ◽  
Forest Lakes ◽  
Ph Range ◽  
North Western ◽  
The Rybinsk Reservoir

The response of the phytoplankton to different degree of pH was studied by the example of 7 shallow weakly mineralized forest lakes located in the Darwin National reserve on the north shore of the Rybinsk reservoir (north-western Russia). With a decrease of pH the number of phytoplankton species decreased especially among centric diatoms,blue-greens and Euglenophyta, total biomass of phytoplankton and its seasonal dispersion declined. Green algae, chrysomonades and cryptomonades biomass correlated negatively with pH but diatoms and blue-greens biomass were related positively to pH. The drop in pH produced a decrease of Shannon-Weaver diversity index, obtained from biomass and cell volume of algae, increase of Simpson index and algae size. The growth of phytoplankton did not correspond the total phosphorus. The necessary modifications to the structural characteristics of phytoplankton by the acidification came about in the pH range from 6 to 5.

scholarly journals Variations of chlorophyll-a and particulate organic carbon in the Yellow-Bohai Sea: in response to the Typhoon Lekima event

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiaowen Wang ◽  
Xiujun Wang ◽  
Zai-Jin You
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Chlorophyll A ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Sediment Resuspension ◽  
Chl A ◽  
Marginal Seas ◽  
Terrigenous Input ◽  
The North

AbstractTyphoon events have large impacts on marginal seas’ environmental conditions with implications for biological processes and carbon cycling. However, little is known about the responses of phytoplankton and particulate organic carbon (POC) to typhoon events in the Yellow-Bohai Sea (YBS). In this study, we utilized satellite-derived datasets of chlorophyll-a (Chl-a) and POC, together with key physical parameters, to analyze their responses to the Typhoon Lekima event induced heavy rainfall and strong winds. Overall, there were enhanced upwelling, strengthened currents, and increased terrestrial runoff during weakened Typhoon Lekima in the YBS. The basin-scale response of Chl-a showed large differences post the Typhoon Lekima event, with a decrease in the Bohai Sea (BS, 0.34 ± 3.0 mg m−3) but an increase in Yellow Sea (YS, 0.23 ± 1.7 mg m−3 in the south YS and 0.54 ± 0.8 mg m−3 in the north YS). The increase of Chl-a in the YS was attributed to increased nutrients, whereas the reduction of Chl-a in the BS was caused by dilution and water exchange with the North Yellow Sea. However, there was an overall increase in POC post-Typhoon Lekima in both BS and YS. The increase of POC in the majority of BS resulted largely from enhanced sediment resuspension and terrigenous input. The increase of POC in the nearshore waters of YS was attributable to enhanced biological production, sediment resuspension, and terrigenous input of POC, whereas the increase of POC in the central YS was partly due to transportation of high-POC waters from nearshore to offshore via strengthened current. Our study highlights the complex impacts of typhoon events on the carbon cycle in marginal seas.

scholarly journals Struktur Komunitas Plankton sebagai Indikator Kualitas Perairan Budidaya di Tambak Lorok Semarang

2019 ◽  
Vol 20 (2) ◽  
pp. 145
Author(s):  
Dzunnuroini Khanif Makhfudhoh ◽  
Jafron Wasiq Hidayat ◽  
Fuad Muhammad
Keyword(s):  
Water Quality ◽  
Diversity Index ◽  
Common Species ◽  
Water Stability ◽  
Community Stability ◽  
Phytoplankton Diversity ◽  
Quality Regulation ◽  
Content Identification ◽  
Equity Index ◽  
Coscinodiscus Granii

Plankton is organisms that had an important role in water as natural feed of fishes and as an indicator. This study aimed to identify water quality which was suitable for fish cultivation reviewed from physics-chemicals parameters of water and its saprobic status in Tambak Lorok Tanjung Mas Kota Semarang. Sampling were take based on 5 stations that could represented from plankton variety of condition water stability . Plankton samples were by using net plankton number 25, then preserved with alcohol 70% and formalin 4%. Variables of ponds water quality measured were temperature, salinity, dissolved oxygen, pH, turbidity, N concentration, and Pb content. Identification of planktons used SRC method under microscop. The result of plankton analysis in Tambak Lorok water showed 42 phytoplankton species, the commonly species found are Coscinodiscus centralis, Coscinodiscus granii, Gyrosigma sp., Navicula radiosa, Pandorina sp., and Melosira sp. Meanwhile, zooplankton found was 22 species with common species are Cyclops, Harpaticoida, Tricodesmium evythraeum, Brachinus plicatilis, and Lensia subtilis. Phytoplankton diversity index are 0.057-0.367 and equity index are 0.025-0.176. Zooplankton diversity index are 0.247-0.360 and equity index are 0.157-0.201. This indices showed that there were low level of species diversity and community stability, dominance since the species occurred. Measurement of water quality variables indicated that Tambak Lorok had been contaminated and needed a preliminary management before d be used as fish cultivation ponds, because the analysis result was not appropriate with Government water quality  regulation. Based on the measurement, soprobic index categories on α/β-Mesosaprobic to Oligosaprobic phase and the degree of pollution is very mild to moderate. Keywords :  Community Structure, plankton, Tambak Lorok, Tanjung Mas, Semarang   

scholarly journals Subsurface low pH and carbonate saturation state of aragonite on China side of the North Yellow Sea: combined effects of global atmospheric CO<sub>2</sub> increase, regional environmental changes, and local biogeochemical processes

2013 ◽  
Vol 10 (2) ◽  
pp. 3079-3120 ◽  
Author(s):  
W.-D. Zhai ◽  
N. Zheng ◽  
C. Huo ◽  
Y. Xu ◽  
H.-D. Zhao ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Bottom Water ◽  
Bohai Sea ◽  
Environmental Changes ◽  
Water Mass ◽  
Salinity Range ◽  
Saturation State ◽  
North Yellow Sea ◽  
The North ◽  
Subsurface Waters

Abstract. Based upon seven field surveys conducted between May 2011 and January 2012, we investigated pH, carbonate saturation state of aragonite (Ωarag), and ancillary parameters on the Chinese side of the North Yellow Sea, a western North Pacific continental margin of major economic importance. Subsurface waters were nearly in equilibrium with air in May and June. From July to October, the fugacity of CO2 (fCO2) of bottom water gradually increased to 697 ± 103 μatm and pH decreased to 7.83 ± 0.07 due to respiration/remineralization processes of primary production induced biogenic particles. In November and January, bottom water fCO2 decreased and pH gradually returned to an air-equilibrated level due to cooling enhanced vertical mixing. The corresponding bottom water Ωarag was 1.74 ± 0.17 (May), 1.77 ± 0.26 (June), 1.70 ± 0.26 (July), 1.72 ± 0.33 (August), 1.32 ± 0.31 (October), 1.50 ± 0.28 (November), and 1.41 ± 0.12 (January). Critically low Ωarag values of 1.0 to 1.2 were mainly observed in subsurface waters in a salinity range of 31.5–32.5 psu in October and November, accounting for ~ 10% of the North Yellow Sea area. Water mass derived from the adjacent Bohai Sea had a typical water salinity of 30.5–31.5 psu, and bottom water Ωarag values ranged mostly between 1.6 and 2.4. This study showed that the carbonate system in the North Yellow Sea was substantially influenced by global atmospheric CO2 increase. The community respiration/remineralization rates in typical North Yellow Sea bottom water mass were estimated at 0.55–1.0 μmol O2 kg−1 d−1 in warm seasons, leading to seasonal drops in subsurface pH and Ωarag. Outflow of the Bohai Sea water mass counteracted the subsurface Ωarag reduction in the North Yellow Sea.

RESERVOIR CHARACTERISTICS AND INFLUENTIAL FACTORS IN THE EASTERN DEPRESSION OF THE NORTH YELLOW SEA BASIN

2014 ◽  
Vol 33 (2) ◽  
pp. 111-120
Author(s):  
Jie LIANG ◽  
Zhenhe WEN ◽  
Guolin XIAO ◽  
Yinguo ZHANG ◽  
Heping DONG
Keyword(s):  
Yellow Sea ◽  
Influential Factors ◽  
North Yellow Sea ◽  
Reservoir Characteristics ◽  
The North
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