The influence of environmental parameters on the phytoplankton community of two tropical reservoirs

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Jessica Chappell ◽  
Stefanie Whitmire ◽  
David Sotomayor‐Ramírez ◽  
Gustavo Martínez
Keyword(s):  
Phytoplankton Community ◽  
Environmental Parameters ◽  
Tropical Reservoirs

Variation in climate determines differences in the effects of abiotic variables on the phytoplankton community in tropical ecosystems

2018 ◽  
Vol 69 (3) ◽  
pp. 357
Author(s):  
F. H. Portella Corrêa de Oliveira ◽  
A. N. Moura ◽  
Ê. W. Dantas
Keyword(s):  
Phytoplankton Community ◽  
Synergistic Effects ◽  
Climatic Conditions ◽  
Cylindrospermopsis Raciborskii ◽  
Tropical Reservoirs ◽  
Physicochemical Variables ◽  
Abiotic Variables ◽  
Tropical Climates ◽  
Semi Arid ◽  
Canonical Analyses

The present study demonstrates the effects of abiotic variables on phytoplankton in two different tropical climates. Samples were taken from tropical reservoirs, including six from a tropical climate (As) and five from a semi-arid climate (BSh). Phytoplankton samples were identified, biomass was quantified and climatic and physicochemical variables were evaluated. Canonical analyses were performed in order to observe the effects of abiotic variables on phytoplankton. In both As and BSh ecosystems, the effects of the physicochemical variables were significant, but the synergistic effects between variables and climatic conditions were more pronounced in BSh. Micronutrients had a significant role in structuring the phytoplankton community in both As and BSh. In As, Cylindrospermopsis raciborskii occurred in the presence of lower concentrations of zinc and copper, whereas in BSh this species was present in the presence of higher concentrations of zinc. In the As climate, Geitlerinema amphibium, Cyclotella meneghiniana, Planktothrix agardhii and Microcystis aeruginosa were associated with higher sodium concentrations in the water, whereas in the BSh climate these species experienced lower rainfall. The findings of the present study show that climate determines the effects of abiotic variables on the phytoplankton community in both an independent and synergistic manner. In the present study, phytoplankton in tropical and semi-arid reservoirs is mostly regulated by nutrients, the effects of which vary according to climate.

scholarly journals Phytoplankton Dynamics in the Middle Adriatic Estuary, with a Focus on the Potentially Toxic Genus Pseudo-nitzschia

2020 ◽  
Vol 8 (8) ◽  
pp. 608
Author(s):  
Jasna Arapov ◽  
Mia Bužančić ◽  
Sanda Skejić ◽  
Jelena Mandić ◽  
Ana Bakrač ◽  
...  
Keyword(s):  
Domoic Acid ◽  
Phytoplankton Community ◽  
River Estuary ◽  
Environmental Parameters ◽  
Late Summer ◽  
Diatom Genus ◽  
Human Intoxication ◽  
Stratified Estuary ◽  
Special Environment ◽  
Variable Layer

The Krka River estuary is a karstic, permanently stratified estuary due to the strong freshwater inflow. It is a special environment in which to study the phytoplankton community, especially because this area is an important aquaculture site. Among other potentially toxic phytoplankton species, the diatom genus Pseudo-nitzschia occurs frequently and is a potential source of domoic acid (DA), causing shellfish toxicity and human intoxication. The main objective was to examine the dynamics of the phytoplankton community and, in particular, the genus Pseudo-nitzschia in the upper part of the Krka estuary, through monthly sampling over two years. The phytoplankton community was analysed using light microscopy and scanning electron microscopy to determine the diversity of Pseudo-nitzschia species and characterise the environmental parameters associated with a high abundance of Pseudo-nitzschia species. Seven Pseudo-nitzschia species were identified in the investigation, with higher frequencies and abundances in the less variable layer, at a 7 m depth. Blooms of Pseudo-nitzschia were noted in the late summer/early autumn, dominated by P. delicatissima/arenysensis. Winter assemblages were characterised by P. pseudodelicatissima/cuspidata, P. calliantha, and P. subfraudulenta, and were associated with domoic acid occurrence in shellfish.

scholarly journals Analysis of phytoplankton community in the vicinity of domestic sewage outflow during stratified conditions

2014 ◽  
Vol 15 (3) ◽  
pp. 574 ◽  
Author(s):  
S. SKEJIĆ ◽  
N. BOJANIĆ ◽  
S. MATIJEVIĆ ◽  
O. VIDJAK ◽  
B. GRBEC ◽  
...  
Keyword(s):  
Phytoplankton Community ◽  
Phytoplankton Bloom ◽  
Oxygen Deficiency ◽  
Environmental Parameters ◽  
Taxonomic Diversity ◽  
Water Dynamics ◽  
Multiple Comparison Test ◽  
Before And After ◽  
The Difference ◽  
Research Period

The response of phytoplankton community structure to anthropogenically-derived nutrient from the submarine sewage outflow was analysed in a shallow coastal area of the middle Adriatic Sea. The study was conducted during the eight-year period (2002-2010) at six stations in the Brač Channel, aiming to assess the potential change in the state of biological and environmental parameters before and after the sewage commissioning. The research was particularly focused on phytoplankton producers during the summer which is considered to be critical due to water stratification and low water dynamics. The results show an increase in phytoplankton biomass in the deep layer after the discharge activation that was significant (M-W test; U=584.5, p<0.01), but not related to any intense phytoplankton bloom or oxygen deficiency. Temporal variability of total phytoplankton abundances throughout the research period indicated a significant increase in 2005, the year following the sewage outflow activation. Pairwise Dunn's multiple comparison test emphasised the difference in the years before the sewage activation (2002, 2003) compared to 2005 (2002 vs. 2005, R=-60.92 p<0.001; 2003 vs. 2005, R=-63.92 p<0.001). This situation was soon followed by the rapid equalization in phytoplankton abundances. Considering the entire research period, there were no changes in contributions of major phytoplankton groups, but the increase in overall species diversity was recorded, supporting the view that moderate inputs may stimulate plankton taxonomic diversity in coastal ecosystems. Increased ciliate and copepod nauplii abundance was also observed but was considered to be caused by natural variability.

scholarly journals Diagnosis of ecological quality of Dohou Lake on the basis of environmental parameters and phytoplankton community, Western Côte d’Ivoire

2021 ◽  
Vol 9 (2) ◽  
pp. 073-082
Author(s):  
Martin Kouamé Kouamé ◽  
Séverin Kouakou Attoungbre ◽  
Julie Estelle Niamien Ebrottié ◽  
Charles Koffi Boussou ◽  
Nicole Ahou Yoboué ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Phytoplankton Community ◽  
Environmental Parameters ◽  
Ecological Condition ◽  
Ecological Quality ◽  
Mean Values ◽  
Physico Chemical ◽  
Monthly Variations ◽  
Clear Predominance

The ecological quality of Dohou Lake in Duékoué was determined from the phytoplankton community and physico-chemical parameters. All of the stations in Dohou Lake are dominated by Cyanobacteria and Bacillariophyta individuals, with high monthly proportions observed during the study period. Ecological indicators such as total phosphorus, transparency and chlorophyll made it possible to assess the physico-chemical quality of the environment. Thus, mean total phosphorus values ranged from 970 to 1150 µg/L from station D7 to station D6. Minimum transparency values ranged from 0.1 to 0.5 m from station D7 to D3, and mean values ranged from 0.3 m (station D7) to 0.69 m (station D1). For chlorophyll a, mean values ranged from 3.52 µg/L to 12.98 µg/L from station D7 to station D2, with maximum values for this parameter ranging from 13.4 µg/L (station D7) to 46.73 µg/L (station D2). All of the stations on Dohou lake are therefore in an eutrophic state. The monthly variations in the different proportions of phytoplankton groups observed indicate a clear predominance of Cyanobacteria followed by Bacillariophyta. The values of the Planktonic Index (PI) indicate that the stations are in average ecological condition, except for station D7, which is in poor ecological condition. These ecological qualities are reflected by the spatial and temporal dominance of 4 functional groups which are C, LM, K, and S1.

scholarly journals Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

2017 ◽  
Vol 65 (3) ◽  
pp. 356-372 ◽  
Author(s):  
Ana Karoline Duarte dos Santos ◽  
Amanda Lorena Lima Oliveira ◽  
Jordana Adorno Furtado ◽  
Francinara Santos Ferreira ◽  
Bethânia de Oliveira Araújo ◽  
...  
Keyword(s):  
Phytoplankton Community ◽  
Skeletonema Costatum ◽  
Tidal Flow ◽  
River Estuary ◽  
Environmental Parameters ◽  
Spatial And Temporal Variation ◽  
Statistical Correlations ◽  
Spatial And Seasonal Variation ◽  
Salinity Water ◽  
Highly Correlated

Abstract The Bacanga River Estuary has a hydrodynamic behavior and its tidal flow is limited by a dam. It is considered as a hypertrophic environment that receives daily high loads of domestic sewage without treatment. This study aimed to evaluate the spatial and temporal variation of phytoplankton community and its relationship with environmental parameters. Bi-monthly sampling campaigns were carried out at six fixed sites between 2012 and 2013. Physical-chemical and biological parameters were collected (chlorophyll a, phytoplankton composition and abundance) to perform the statistical correlations. The results indicate that phytoplankton community is mostly represented by diatoms, with Skeletonema costatum being the dominant species responsible for bloom in April and June of 2012. The dominance of this species is related to the high silicate concentrations, pH and turbidity. Other blooms events as well as the Euglena gracilis and Chlamydomonas sp. were recorded in February 2013, when the total phosphorus concentrations were high and the dissolved oxygen concentrations were higher. Dinoflagellates, cyanobacteria and diatom Thallassiosira sp. were widely distributed in the dry period and highly correlated with salinity, water transparency and nutrients. Hence, the distribution of phytoplankton community is more defined seasonally, rather than spatially.

scholarly journals Cyanobacterial Blooms in Lake Varese: Analysis and Characterization over Ten Years of Observations

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 675 ◽  
Author(s):  
Nicola Chirico ◽  
Diana C. António ◽  
Luca Pozzoli ◽  
Dimitar Marinov ◽  
Anna Malagó ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Phytoplankton Community ◽  
Microscopic Analysis ◽  
Environmental Parameters ◽  
Eutrophic Lake ◽  
Cyanobacterial Blooms ◽  
Weather Forecasts ◽  
Management Actions ◽  
Cyanobacteria Blooms ◽  
Microscopy Analysis

Cyanobacteria blooms are a worldwide concern for water bodies and may be promoted by eutrophication and climate change. The prediction of cyanobacterial blooms and identification of the main triggering factors are of paramount importance for water management. In this study, we analyzed a comprehensive dataset including ten-years measurements collected at Lake Varese, an eutrophic lake in Northern Italy. Microscopic analysis of the water samples was performed to characterize the community distribution and dynamics along the years. We observed that cyanobacteria represented a significant fraction of the phytoplankton community, up to 60% as biovolume, and a shift in the phytoplankton community distribution towards cyanobacteria dominance onwards 2010 was detected. The relationships between cyanobacteria biovolume, nutrients, and environmental parameters were investigated through simple and multiple linear regressions. We found that 14-days average air temperature together with total phosphorus may only partly explain the cyanobacteria biovolume variance at Lake Varese. However, weather forecasts can be used to predict an algal outbreak two weeks in advance and, eventually, to adopt management actions. The prediction of cyanobacteria algal blooms remains challenging and more frequent samplings, combined with the microscopy analysis and the metagenomics technique, would allow a more conclusive analysis.

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