scholarly journals PHYTOPLANKTON IN THE PORT OF NOVOROSSIYSK AND OPEN PART OF THE BAY IN 2018

2021 ◽  
Vol 1 (6) ◽  
pp. 201-205
Author(s):  
O.N. Yasakova ◽  
Keyword(s):  
Phytoplankton Biomass ◽  
Emiliania Huxleyi ◽  
Taxonomic Composition ◽  
Total Abundance ◽  
Open Area ◽  
Open Part ◽  
Research Results ◽  
Quantitative Development ◽  
Novorossiysk Bay

The article presents research results of taxonomic composition and quantitative development of the phytoplankton in area of Novorossiysk port and in the open part of the bay for the period of May-September 2018. In total 52 species of the phytoplankton were found. Coefficient of flora similarity in 2017 and 2018 was 62%. Average values of abundance and biomass in the port were 190 thousands cell/L and 250 mg/m3 , in the open areas of the Novorossiysk bay – 266 thousands cell/L и 303 mg/m3 . Dominated in the study area was Bacillariophyta – 70–58 % of the total abundance and 78–75% of the phytoplankton biomass. The small mesosaprobic species diatoms (Thalassionema nitzschioides, Leptocylindrus minimus, Chaetoceros compressus), Euglenophyta (Euglena sp.), Cryptophyta (Plagioselmis punctata) developed significantly in the port. The Chrysophyta (Emiliania huxleyi) and diatoms Proboscia alata и Pseudosolenia calcar-avis prevailed in the open area of the bay

scholarly journals PHYTOPLANKTON OF THE OPEN NORTH-EASTERN PART OF THE BLACK SEA IN THE WINTER PERIOD 2017

2020 ◽  
Vol 1 (5) ◽  
pp. 232-236
Author(s):  
O.N. Yasakova ◽  
Keyword(s):  
Black Sea ◽  
Taxonomic Composition ◽  
The Black Sea ◽  
Winter Period ◽  
Taxonomic Structure ◽  
Open Area ◽  
Planktonic Algae ◽  
North Eastern ◽  
Quantitative Development ◽  
Northeastern Shelf

The seasonal dynamics of phytoplankton development in winter is less studied than in other seasons, therefore it is of certain interest. The article presents the results of the study of taxonomic structure and the level of quantitative development of phytoplankton in the open area of the Black Sea northeastern shelf in December 2017. 34 Species belonging to 5 divisions of Bacillariophyta, Dinophyta, Chrysophyta, Cryptophyta and Chlorophyta were found in phytoplankton. The maximum species diversity was recorded among Dinophyta (21 species) and Bacillariophyta (8 species), other divisions were represented by 1–2 species. Previous studies have shown that the taxonomic composition of phytoplankton in the open area of the Black Sea northeastern part includes a large number of dinophytic species, while the diversity of diatoms is significantly inferior to them. The abundance and biomass of planktonic algae were extremely low during the study period (on average, 2706 cells / liter 11.49 mg / m3 ). The maximum abundance of species (26) and the highest values of quantitative development (5399 cells / l and 32.27 mg / m3 ) were observed in the area of the Taman Peninsula. These values were 2–4 times higher than the values of abundance and biomass found in the rest of the study area. The abundant development of planktonic algae was probably facilitated due to the ingress of waters of the Azov Sea, richer in nutrients, into the Kerch region of the Black Sea. Bacillariophyta (Pseudo-nitzschia pseudodelicatissima, P. seriata, Thalassionema nitzschioides, Pseudosolenia calcar-avis, Ditylum brightwellii), and Dinophyta (Prorocentrum cordatum, Prorocentrum micans and Ceratium species) formed the basis of the abundance (55 and 23 %, respectively) and biomass (24 and 68 %) of phytoplankton. Cryptophyta (Plagioselmis prolonga and P. punctata) accounted for 16 % of the phytoplankton population during the study period. Among the Chrysophyta and Chlorophyta, the species Octactis octonaria and Pterosperma undulatum, common for the open part of the Black Sea, were observed in small quantities. The favorable ecological situation in this region of the sea is proved by the complete absence of Cyanophyta and Euglenophyta, which are indicative of polluted and desalinated sea areas.

Spatial and temporal variation in the abundance and taxonomic composition of estuarine and terrestrial macrofauna associated with mangrove logs

2013 ◽  
Vol 94 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Jennifer T.M. Andrade ◽  
Natália Barros Palhano ◽  
Claudia Helena Tagliaro ◽  
Colin Robert Beasley
Keyword(s):  
Dominant Species ◽  
Multivariate Analyses ◽  
Taxonomic Composition ◽  
Economic Importance ◽  
Spatial And Temporal Variation ◽  
Mangrove Forests ◽  
Tidal Channel ◽  
Total Abundance ◽  
Significant Difference ◽  
Northern Brazil

Brazilian mangroves have ecological and economic importance, with molluscs, crustaceans and polychaetes being diverse and common faunal groups. The present study characterizes the macrofauna associated with logs from two mangrove forests in Pará State, northern Brazil, sampled in September, January and April, between 2008 and 2010, at three different distances from a tidal channel (2, 10, 20 m). In each forest, five logs (diameter/length: 10/40 cm) were randomly selected at each distance, totalling 15 logs per sampling date. The macrofauna was removed, counted and identified. Three-way analysis of variance was used to compare mean numbers of individuals, numbers of taxa and Berger–Parker dominance per log, between forests and among sampling dates and distances from the tidal channel. Non-metric multidimensional scaling and permutational multivariate analyses of variance were used to investigate macrofaunal structure in relation to the three factors. A total of 5437 individuals from both estuarine and terrestrial faunas was found in both forests, with 85 taxa distributed among Mollusca, Annelida, Arthropoda and Nemertea. Abundance increased from September through January to April in both mangrove forests. The most dominant species was Neoteredo reynei, representing 48% of total abundance. No significant difference in any variable was found among the two forests and between the three distances. Logs may represent a stable microhabitat for the macrofauna, with little variation in humidity, salinity or temperature, despite different distances from the tidal channel. However, macrofaunal structure varied significantly between forests and among sampling dates, probably due to seasonal differences in precipitation and salinity between both locations.

The Prediction of Lacustrine Phytoplankton Diversity

1981 ◽  
Vol 38 (5) ◽  
pp. 524-534 ◽  
Author(s):  
Bruce D. LaZerte ◽  
Susan Watson
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Good Predictor ◽  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
Taxonomic Composition ◽  
Phytoplankton Community Structure ◽  
Trophic Gradient ◽  
Phytoplankton Diversity ◽  
Total Phytoplankton

We tested the hypothesis that total phytoplankton biomass can predict phytoplankton community structure independent of its taxonomic composition. From a 2-yr study on Lake Memphremagog, Quebec, which exhibits a marked axial trophic gradient, 133 samples were rarefied to uniform count sizes and a range of diversity numbers, based on proportional biomass, was calculated for each. Biomass is a good predictor of evenness (0.7 < R < 0.9), but not species richness (0.1 < R < 0.3), and this prediction is independent of changes in taxonomic composition. Species richness is more directly related to season and changes in taxonomic composition.Key words: diversity, evenness, species richness, phytoplankton

scholarly journals Seasonal Dynamic of CDOM in a Shelf Site of the South-Eastern Ligurian Sea (Western Mediterranean)

2020 ◽  
Vol 8 (9) ◽  
pp. 703
Author(s):  
Luca Massi ◽  
Laura Frittitta ◽  
Chiara Melillo ◽  
Francesca Polonelli ◽  
Veronica Bianchi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Organic Carbon ◽  
Phytoplankton Biomass ◽  
Light Availability ◽  
Western Mediterranean ◽  
Taxonomic Composition ◽  
Seasonal Dynamic ◽  
Ligurian Sea ◽  
Positive Correlations ◽  
High Level

Chromophoric dissolved organic matter (CDOM) is the fraction of the Dissolved Organic Carbon (DOC) mainly absorbing UV and blue radiation, influencing water optical properties, light availability for primary production, and water-leaving radiance. In open seas, phytoplankton is the main source of organic carbon and CDOM. Despite this, the direct or indirect phytoplankton role in CDOM production is not yet fully clarified. From studies about the relationship between CDOM and phytoplankton biomass as Chlorophyll a (Chl) in the epipelagic layer, positive correlations have been highlighted with regional differences and high levels of variability. Seven years of seasonal dynamic and vertical distribution of CDOM in the Ligurian Sea continental shelf waters have been analyzed in order to evidence the main environmental and/or biological factors determining CDOM dynamic, focusing on the CDOM/Chl relationship. CDOM optical properties (absorption at 440 nm, aCDOM (440), and spectral slope, S) allowed to distinguish different pools and to debate their origin. Four different pools were characterized and two of them were directly or indirectly related to phytoplankton biomass and taxonomic composition. Nevertheless, CDOM/Chl confirm a high level of variability These findings suggest some inputs to improve Mediterranean satellite estimates of Chl and CDOM, such as the seasonal differentiation of optical properties, especially S and CDOM/Chl relationships.

Influence of ultraviolet-B radiation, stratospheric ozone variability, and thermal stratification on the phytoplankton biomass dynamics in a mesohumic lake

2000 ◽  
Vol 57 (3) ◽  
pp. 600-609 ◽  
Author(s):  
Marguerite A Xenopoulos ◽  
Yves T Prairie ◽  
David F Bird
Keyword(s):  
Phytoplankton Biomass ◽  
Thermal Stratification ◽  
Stratospheric Ozone ◽  
Negative Relationship ◽  
Taxonomic Composition ◽  
Ultraviolet B ◽  
Temporary Increase ◽  
Ultraviolet B Radiation ◽  
Major Shift ◽  
The Impact

Terrestrial ultraviolet radiation (UVR) is highly variable in both space and time, and phytoplankton in the mixed layer may be exposed at irregular intervals to significant daily doses. The influence of the natural UVR on phytoplankton dynamics was investigated in a small mesohumic lake, Lac Cromwell, in the Laurentian Hills by means of a time-intensive (about 60 days) daily study of the relationship between UVR flux and phytoplankton biomass. Following the onset of lake stratification, at which time the epilimnion became shallower than 2.5 m, the study revealed a strong negative relationship between ultraviolet-B radiation (UVB) and algal biomass at the surface (r 2 = 0.61) and at 1 m (r 2 = 0.38). Although this relationship held throughout the stratified period, chlorophyll a concentration declined particularly rapidly (-65%) during a short-lived ozone-thinning period. There was a major shift in the community taxonomic composition during the same period from a typical diatom-chrysophyte spring bloom towards a dinoflagellate-dominated community that was followed by cyanobacteria. Here, we present evidence that the impact of the temporary increase in UVB was intensified by a concurrent lack of mixing, indicating that turbulence and thermal stratification are key components modulating UVB effects in lakes.

scholarly journals Improved estimates of phytoplankton community composition based on in situ spectral fluorescence: use of ordination and field-derived norm spectra for the bbe FluoroProbe

2016 ◽  
Vol 73 (10) ◽  
pp. 1472-1482 ◽  
Author(s):  
Joel W. Harrison ◽  
E. Todd Howell ◽  
Susan B. Watson ◽  
Ralph E.H. Smith
Keyword(s):  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
Taxonomic Composition ◽  
Lake Huron ◽  
Aquatic Environments ◽  
Mean Square ◽  
Ordination Analysis ◽  
And Cluster Analysis ◽  
Phytoplankton Taxonomy

The use of spectral fluorometers for assessing phytoplankton concentrations and taxonomic composition in aquatic environments is increasingly common. However, the accuracy of such assessments suffers because the necessary norm spectra (spectral fingerprints) are derived using selected taxa and laboratory conditions that may not adequately represent the taxa and environmental conditions in the study area. Ordination analysis of raw fluorescence data has been proposed as a better means of interpreting spectral fluorescence data. We applied nonmetric multidimensional scaling and cluster analysis to raw in situ fluorescence data from Sturgeon Bay, a small, mesotrophic embayment of Georgian Bay (Lake Huron) to obtain system-specific norm spectra for the bbe FluoroProbe. The revised spectra gave improved estimates of phytoplankton taxonomy (root mean square error of 10% versus 14%) and of dissolved organic carbon and chlorophyll a concentrations. While promising, this method should be further explored in other systems with different and (or) weaker gradients in phytoplankton biomass and taxonomic composition.

scholarly journals Peculiarities of transformation of phytoplankton of Zhytomir reserve

2020 ◽  
pp. 49-57
Author(s):  
Yu. Shelyuk ◽  
Keyword(s):  
Phytoplankton Biomass ◽  
High Speed ◽  
Trophic Status ◽  
Water Cycle ◽  
Taxonomic Composition ◽  
Water Levels ◽  
Phytoplankton Production ◽  
Taxonomic Structure ◽  
Blue Green Algae ◽  
Class Level

Stable functioning of the ecosystem of the Zhytomir reservoir, which is indicated by the absence of directed changes in the primary production over a long period, is pro­bably supported by the alterations of the algae groups at the level of their structure, by the high speed of incorporation of organic matter into the bio-water cycle, and by large areas of water levels. Over the last 10 years, the role of blue-green algae has decreased in the taxonomic composition of the phytoplankton of the Zhytomir reservoir, while the species richness of green, euglenic and golden ones has increased; there were minor alterations to the phytoplankton structure at the class level and more noticeable changes at the order, family, and birth levels. Over a period of almost ten years the species saturation of the genus Chlamydomonas Ehrenb., Euglena Ehrenb., Cyclotella Kützing., Peridinium Ehrenb. Generally, the generic coefficients and the saturation of species with intraspecific taxa increased (which was also observed for the small Denyshivske reservoir), whereas for large reservoirs of the Dnipro and Volga there is a tendency to simplify the taxonomic structure of phytoplankton with their age. Phytoplankton biomass indicators remained unchanged for almost ten years, however, there was a shift in biomass peaks from summer to autumn. The number of algae cells decreased. Phytoplankton alignment decreased. Inadequacy has been established in the trophic status of the Zhytomir Reservoir, determined by biomass and primary phytoplankton production. The higher trophic level, determined by the intensity of photosynthesis, is probably due to the predominance in the dominant complexes of small-cell highly productive species that support the high trophic status of aquatic ecosystems with relatively low phytoplankton biomass. At the present stage, there is a tendency to improve the water quality of the reservoir according to the saprobiological indicators of phytoplankton development in comparison with 2003–2007.

Diatoms in the phytoplankton of the Vetluga River

2019 ◽  
pp. 120-122
Author(s):  
Pavel V. Kulizin ◽  
Ekaterina L. Vodeneeva ◽  
Alexander G. Okhapkin
Keyword(s):  
Alien Species ◽  
Phytoplankton Biomass ◽  
Taxonomic Composition ◽  
Leading Role ◽  
Cheboksary Reservoir

Data on the taxonomic composition and significance of diatoms in the phytoplankton of one of the major tributaries of the Cheboksary reservoir (Vetluga River) are given. The leading role of diatoms in phytoplankton biomass is shown. The emergence and vegetation of alien species are revealed.

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