Studies on the Community Structure of Phytoplankton in the Sea near Sanmen Bay

2012 ◽  
Vol 518-523 ◽  
pp. 502-508 ◽  
Author(s):  
Gen Hai Zhu ◽  
Jian Qian ◽  
Li Hong Chen
Keyword(s):  
Community Structure ◽  
Dominant Species ◽  
Red Tide ◽  
Skeletonema Costatum ◽  
Continuous Observation ◽  
Dominant Group ◽  
Average Cell ◽  
Cell Abundance ◽  
Sanmen Bay ◽  
Sea Area

This paper reports the phytoplankton investigation results which were collected in 15 observation stations and a day-night continuous observation station in the sea area near Sanmen Bay (29° 00'00 "~ 29° 10'26 "N, 121° 34'43" ~ 121° 47'06 "E) in spring(April), summer (July), autumn (October) of 2007 and winter (January) of 2008. After microscopic observation and identification, a total of 6 phyla, 56 genera, 146 species were identified in the sea near Sanmen Bay. The seasonal species change was spring (101)> autumn (96)> summer (96)> winter (85). The cell abundance of phytoplankton in the sea near Sanmen Bay was 0.72103～1.3106 cells /dm3, and the average cell abundance was 5.13104 cells /dm3. The mean cell abundance in winter was 1.27105cells/dm3 >4.72104cells/dm3 in autumn > 1.63104 cells/dm3 in spring > 2.51103cells/dm3 in summer. During the 24-hour continuous observation, in the day time, particularly in the afternoon, the photosynthesis was strong, and the cell abundance of phytoplankton was high; at night, especially in the latter half of the night or wee hours, the photosynthesis was weak, and the cell abundance of phytoplankton was low. The dominant species of phytoplankton in the Sanmen Bay was Skeletonema costatum. Ecological types of phytoplankton can be divided into three groups: (1) inner bay and coastal temperate group; (2) eurythermal and euryhaline group; (3) warm water off-shore group. Inner bay and coastal eurythermal and euryhaline group was the dominant group. The amounts of other groups were less. Totally 64 red-tide species were observed in the sea area near Sanmen Bay, of which, diatoms was predominant, 40 species; dinoflagellates was 19 species; Cyanophyta was 2 species; Euglena、Chrysophyceae and Protozoa was 1 specie respectively. The average cell abundance of the main red-tide organisms in the sea area near Sanmen Bay was 5.6102 cells/dm3～1.2105 cells/dm3. The dominant species composition and community structure of phytoplankton were mainly composed of diatoms, such as Skeletonema costatum, Ditylum brightwelli, Coscinodiscus jonesianus, Thalassiosira eccentrica, Leptocylindrus danicus, Chaetoceros lorenzianus; pyrrophyta, such as Ceratium fusus, Ceratium tripos, Ceratium furca etc.

scholarly journals Characteristics of Benthos communities in Laoting area of Hebei Province

2020 ◽  
Vol 206 ◽  
pp. 02024
Author(s):  
Li Guanglou ◽  
Cao Hongmei ◽  
Ye wei
Keyword(s):  
Community Structure ◽  
Benthic Community ◽  
Dominant Species ◽  
Diversity Index ◽  
Hebei Province ◽  
Benthic Community Structure ◽  
Number Of Species ◽  
Evenness Index ◽  
Sea Area ◽  
Richness Index

According to a survey of benthos in the Laoting sea area of Hebei Province on May 24th 2019, a total of 40 benthos species were obtained, of which mollusks have the largest number, followed by annelids and arthropods. The dominant species are Sternaspis sculata and Ringicula doliaris. The number of species obtained in this survey is much lower than the historical average. The diversity index is significantly lower than that in the April 2008 survey, and the evenness index and richness index have declined slightly, indicating that the benthic community structure in this sea area tends to be simplistic, stability tends to deteriorate.

The Distribution of Microphytoplankton and Heavy Metal Content of Xiangshan Bay in Spring

2013 ◽  
Vol 864-867 ◽  
pp. 428-433 ◽  
Author(s):  
Gen Hai Zhu ◽  
Wei Hua Feng ◽  
Mao Jin ◽  
Li Hong Chen
Keyword(s):  
Heavy Metal ◽  
Human Activities ◽  
Metal Content ◽  
Dominant Species ◽  
Heavy Metal Content ◽  
Class I ◽  
Surface Seawater ◽  
Average Cell ◽  
Cell Abundance ◽  
Xiangshan Bay

The abundance of microphytoplankton and distribution of soluble heavy metal content of Xiangshan Bay were investigated in 2012. And the results showed that the abundance of microphytoplankton was 22×104~502×104 cells/m3 and the average cell abundance was 117×104 cells/m3. The dominant species of microplankton were Coscinodiscus jonesianus. The abundance of microplankton cells reduced from middle port to the mouth of the port. The concentrations of Hg, As, Cu, Pb, Zn, Cd and total Cr of surface seawater in the whole areas studied were satisfied the class I water standard. Due to human activities, the concentrations of some areas in the bottom and middle of the port were relatively high and approximately satisfied class II water standard. The concentrations reduced from bottom to the mouth, however, most sea areas were still satisfied class I water standard

Effects of resuspension of eastern oyster Crassostrea virginica biodeposits on phytoplankton community structure

2020 ◽  
Vol 640 ◽  
pp. 79-105
Author(s):  
ET Porter ◽  
E Robins ◽  
S Davis ◽  
R Lacouture ◽  
JC Cornwell
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Crassostrea Virginica ◽  
Skeletonema Costatum ◽  
Eastern Oyster ◽  
Energy Dissipation Rate ◽  
Negative Effects ◽  
Cell Densities ◽  
Sediment Bottom ◽  
Nitrite Nitrate

Anthropogenic disturbances in the Chesapeake Bay (USA) have depleted eastern oyster Crassostrea virginica abundance and altered the estuary’s environment and water quality. Efforts to rehabilitate oyster populations are underway; however, the effect of oyster biodeposits on water quality and plankton community structure are not clear. In July 2017, we used 6 shear turbulence resuspension mesocosms (STURMs) to determine differences in plankton composition with and without the daily addition of oyster biodeposits to a muddy sediment bottom. STURM systems had a volume-weighted root mean square turbulent velocity of 1.08 cm s-1, energy dissipation rate of ~0.08 cm2 s-3, and bottom shear stress of ~0.36-0.51 Pa during mixing-on periods during 4 wk of tidal resuspension. Phytoplankton increased their chlorophyll a content in their cells in response to low light in tanks with biodeposits. The diatom Skeletonema costatum bloomed and had significantly longer chains in tanks without biodeposits. These tanks also had significantly lower concentrations of total suspended solids, zooplankton carbon, and nitrite +nitrate, and higher phytoplankton carbon concentrations. Results suggest that the absence of biodeposit resuspension initiates nitrogen uptake for diatom reproduction, increasing the cell densities of S. costatum. The low abundance of the zooplankton population in non-biodeposit tanks suggests an inability of zooplankton to graze on S. costatum and negative effects of S. costatum on zooplankton. A high abundance of the copepod Acartia tonsa in biodeposit tanks may have reduced S. costatum chain length. Oyster biodeposit addition and resuspension efficiently transferred phytoplankton carbon to zooplankton carbon, thus supporting the food web in the estuary.

A Study on the Distribution and Correlation of Small Phytoplankton and Nutrients (N, P) in Spring in the Xiangshan Harbor

2013 ◽  
Vol 864-867 ◽  
pp. 313-318 ◽  
Author(s):  
Li Hong Chen ◽  
Gen Hai Zhu ◽  
Jian Qian ◽  
Wei Hua Feng ◽  
Mao Jin
Keyword(s):  
Surface Water ◽  
Bottom Water ◽  
Significant Positive Correlation ◽  
Nutrient Content ◽  
Positive Correlation ◽  
Cell Abundance ◽  
Phytoplankton Cell ◽  
Small Phytoplankton ◽  
Sea Area ◽  
Distribution Trends

The distribution and correlation of small phytoplankton and nutrients in spring of 2012 in Xiangshan Harbor were studied. The results showed that in spring, the higher values of small phytoplankton cell abundance and nutrient content were distributed in the station from S01 to S06 which were located in the sea area of Tie port and Huangdun port. Meanwhile, the lower values were mainly distributed in the station from S17 to S31 which were located in the sea area of the outer Xiangshan Bay and the sea area around Liuheng Island. From the bottom to the middle to the entrance, the values reduced in turn. The content of N, P in the surface water was higher than that in the bottom water, but the distribution trends were the same no matter in the surface water or in the bottom water. There was significant positive correlation between small phytoplankton cell abundance and nutrient content in the water of Xiangshan Harbor.

Diversity and community structure of Ephemeroptera in freshwater stream of Megamalai hills, Tamil Nadu, India

ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 279-284
Author(s):  
S. Barathy ◽  
T. Sivaruban ◽  
Srinivasan Pandiarajan ◽  
Isack Rajasekaran ◽  
M. Bernath Rosi
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Air Temperature ◽  
Tamil Nadu ◽  
Dominant Species ◽  
Diversity Indices ◽  
Low Diversity ◽  
Freshwater Stream ◽  
Species Diversity Indices ◽  
High Diversity

In the study on the diversity and community structure of Ephemeroptera in the freshwater stream of Chinnasuruli falls on Megamalai hills, a total of 523 specimens belonging to thirteen genera and five families were collected in six month periods. Of the five families, Teloganodidae and Leptophlebiidae exhibited high diversity and Caenidae showed low diversity. Choroterpes alagarensis (Leptophlebiidae) is the most dominant species. Diversity indices such as Shannon and Simpson indices showed that diversity was maximum in November and December and it was minimum in August and January. Canonical Correspondence Analysis revealed that rainfall, water flow, turbidity, and air temperature were the major stressors in affecting the Ephemeropteran community structure.

The benthos of the deeper sediments of the Firth of Clyde, with particular reference to organic enrichment

1986 ◽  
Vol 90 ◽  
pp. 329-350
Author(s):  
T. H. Pearson ◽  
A. D. Ansell ◽  
L. Robb
Keyword(s):  
Sewage Sludge ◽  
Urban Areas ◽  
Dominant Species ◽  
Organic Enrichment ◽  
General Survey ◽  
Sludge Disposal ◽  
Benthic Infauna ◽  
Clyde Sea ◽  
Sea Area

SynopisA general survey of the biomass of the benthic infauna of the Clyde Sea Area and the distribution and abundance of the dominant species throughout the area, based on data from surveys undertaken in 1972 and 1974, is described. Recent surveys of the distribution of species along a well-defined gradient of organic enrichment on the Garroch Head sewage sludge disposal grounds in the central Firth of Clyde are used comparatively to suggest that benthic populations in the inner sea lochs, Kilbrannan Sound and in areas along the Ayrshire coast are markedly enriched. It is suggested that this enrichment may be caused by a general eutrophication of the Clyde Sea Area enhancing the effects of localised carbon inputs from urban areas.

The community structure of larval fish populations in an area of the Celtic Sea in 1998

2002 ◽  
Vol 82 (4) ◽  
pp. 641-648 ◽  
Author(s):  
S. Acevedo ◽  
O. Dwane ◽  
J.M. Fives
Keyword(s):  
Community Structure ◽  
Fish Species ◽  
Larval Fish ◽  
Single Species ◽  
Coastal Fish ◽  
Larval Stages ◽  
Celtic Sea ◽  
Sea Area ◽  
Insight Into ◽  
Fish Distributions

Ichthyoplankton from an area in the Celtic Sea was studied to provide an insight into the fish larval community structure in March, May and June 1998. Three station groups were defined each month, Neritic, Transition and Oceanic. The Neritic assemblages included larval stages of coastal fish species and the Oceanic assemblages included mesopelagic and high-oceanic fish species which were not recorded from any of the Neritic stations. The Transition stations usually contained species characteristic of both the Neritic and Oceanic assemblages. It is suggested that these broad patterns of larval fish distributions are constant features of the Celtic Sea area, probably related to the spawning location of the adults. The area is, in general, species poor, with the Oceanic stations usually dominated by a single species, indicating the presence of a large spawning school of fish.

Epiphyton of oligotrophic lakes of Leningrad region

2021 ◽  
pp. 71-79
Author(s):  
Elena V. Stanislavskaya
Keyword(s):  
Community Structure ◽  
Dominant Species ◽  
Taxonomic Composition ◽  
Species Level ◽  
Taxonomic Structure ◽  
Leningrad Region ◽  
Oligotrophic Lakes ◽  
Epiphytic Algae ◽  
Lake Ecosystems ◽  
Epiphytic Communities

Here are results of investigation of taxonomic composition, community structure and dominant species of epiphytic algae in 12 oligotrophic lakes located in different geomorphic regions of Leningrad region. In summer epiphytic communities there were 385 algal taxa, they belonged to 6 taxonomic divisions: Cyanophyta (Cyanoprokaryota) – 50 (13%), Bacillaryophyta – 175 (45%), Chlorophyta – 37 (10%), Charophyta – 118 (30%), Xanthophyta – 4 (1,55%), Rhodophyta – 1 (0,45%). The taxonomic structure of each lake was predominant diatoms and desmids, but the biomass was dominated by zygnems and green algae. In total, the taxonomic composition of the epiphyton in the studied lakes is similar, the differences are revealed at the species level. The structure of dominanting epiphyton complex was rather constant and composed by a small number of species. The greatest contribution to the epiphyton was made by Tabellaria flocculosa and species of the genus Bulbochaete. The structure of the epiphyton reflects the undisturbed nature of lake ecosystems, as well as their northern location.

Shark longline fishery of Papua New Guinea: size and species composition and spatial variation of the catches

2020 ◽  
Vol 71 (6) ◽  
pp. 627
Author(s):  
William T. White ◽  
Leontine Baje ◽  
Sharon A. Appleyard ◽  
Andrew Chin ◽  
Jonathan J. Smart ◽  
...  
Keyword(s):  
Papua New Guinea ◽  
Dominant Species ◽  
New Guinea ◽  
Species Level ◽  
Longline Fishery ◽  
Specific Identification ◽  
Level Information ◽  
Sea Area ◽  
Number Of Individuals ◽  
Species Being

This study provides the first detailed investigation of the catches of the shark longline fishery in Papua New Guinea. Fisheries observers collected data on shark catches from a total of 318 longline sets between May and June 2014, before its closure in July 2014. In all, 14694 sharks were recorded with a total estimated biomass of 439 tonnes (Mg). Eighteen species of sharks were recorded in the observer data, with the most dominant species being Carcharhinus falciformis, which constituted more than 90% of the total catches by both weight and number of individuals. The level of observer misidentification was low (<10%), which reflected the use of region-specific identification guides by well-trained fisheries observers. The most diverse catches were in the Solomon Sea area, whereas catches in most other areas, particularly the Bismarck Sea areas, were less diverse and more strongly dominated by C. falciformis. Size and sex ratios varied by species, highlighting the importance of obtaining species-level information from the fishery being investigated. Any consideration by fisheries managers to reopen this fishery needs to consider the effect this will have on the species targeted and the livelihoods of coastal fishers who also rely on the same resources.

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