Trophic state and seasonal dynamics of phytoplankton communities in two sand-pit lakes at different successional stages

Phytoplankton groups are one of the major quality element to be used in the evaluation of the trophic and ecological state of freshwater ecosystems according to the EU Water Framework Directive. This research was made to assess the trophic and ecological status of Lake Bafa in Turkey, on the basis of phytoplankton communities. Büyük Menderes River is one of the most important factor that carries pollutants to Lake Bafa. The eight sampling station were assigned to evaluate the ecological and trophic state of the lake. Phytoplankton species were collected monthly for 2 years study period. Most commonly used phtoplankton indices Q index and Carlson’s Trophic State Index (TSI), and different versions of diversity indices were used to estimate trophic and ecological state of the lake. Similarities between the sampling stations were clustured by using the unweighted pair group method using arithmetic average (UPGMA), based on phytoplankton communities. Correlations between the applied indices were determined by using Pearson Correlation. After the identification of collected phytoplanktons, total of 63 taxa which belong to classis of Cyanophyceae (11.2%), Bacillariophyceae (49.2%), Chlorophyceae (23.8%), Xanthophyceae (1.5%), Euglenophyceae (11.2%) and Dinophyceae (3.1%) were detected. The 1st and 2nd stations were the most similar stations to each other (88%) according to phytoplankton communities. Secchi disc depth (SD) and TP played an important role in the distribution of phytoplankton species in Lake Bafa. The highest significant positive correlation was determined between Q and TSI (r = 0.987, p˂0.01). Considering the TDI values in the phytoplankton composition of the lake, it can be said that although the productivity status of the studied lake is still “mesotrophic”, it has a tendency towards “eutrophic” state. According to the Q values, the first five stations reflect the moderate ecological state, while the 6th, 7th and 8th stations represent the poor ecological state.

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Comparing microscopic counts and pigment analyses in 46 phytoplankton communities from lakes of different trophic state

Freshwater Biology ◽

10.1111/fwb.12803 ◽

2016 ◽

Vol 61 (10) ◽

pp. 1627-1639 ◽

Cited By ~ 13

Author(s):

Louise Schlüter ◽

Stephan Behl ◽

Maren Striebel ◽

Herwig Stibor

Keyword(s):

Trophic State ◽

Phytoplankton Communities

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Warming and Eutrophication Effects on Phytoplankton Community of Two Tropical Systems with Different Trophic States—An Experimental Approach

10.20944/preprints201705.0030.v1 ◽

2017 ◽

Author(s):

Andreia Maria Da Anunciação Gomes ◽

Marcelo Manzi Marinho ◽

Marcella Coelho Berjante Mesquita ◽

Ana Carolina Coelho Prestes ◽

Miquel Lürling ◽

...

Keyword(s):

Global Warming ◽

Temperature Variation ◽

Trophic State ◽

Cyanobacterial Blooms ◽

Effect Of Temperature ◽

Temperature Changes ◽

Relative Contribution ◽

Eutrophic Water ◽

Phytoplankton Communities ◽

State Water

Global warming, as well as europhication are predicted to promote cyanobacterial blooms, but how tropical phytoplankton communities from different trophic state systems respond to temperature variation is less known. To further explore the effect of temperature changes and nutrient addition on phytoplankton communities and to get insight in possible resistance to these effects, we tested the hypothesis that temperature variation will have a stronger effect on cyanobacteria dominance in eutrophic water than in oligo-mesotrophic. Hereto, we conducted an experiment with phytoplankton communities from two aquatic ecosystems differing in trophic state. Water samples from a eutrophic and an oligo-mesotrophic system were collected and incubated in 25 and 30ºC. Also, treatments that received additional surplus N and P were included that served as eutrophication treatments. Temperature variation itself did not promote cyanobacteria in either water from the oligo-mesotrophic or the eutrophic system. However, nutrient enrichment of water from the eutrophic system significantly boosted cyanobacteria, and biomass increased 10 times in both 25ºC and 30ºC treatments. In contrast, eutrophication of water from the oligo-mesotrophic system did not change the relative contribution of phytoplankton groups and response ratios were much lower than those for water from the eutrophic system. Although using a very simple experimental design, the results suggest that in eutrophic systems cyanobacteria dominance can be favoured by further addition of nutrients, independently of a direct temperature effect and that more pristine environments possess some resistance against eutrophication. Since global warming is assumed to intensify eutrophication symptoms indirectly, our study underscores the importance of nutrient control.

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Seasonal succession of functional traits in phytoplankton communities and their interaction with trophic state

Journal of Ecology ◽

10.1111/1365-2745.13395 ◽

2020 ◽

Vol 108 (4) ◽

pp. 1649-1663

Author(s):

Valerie Carolin Wentzky ◽

Jörg Tittel ◽

Christoph Gerald Jäger ◽

Jorn Bruggeman ◽

Karsten Rinke

Keyword(s):

Functional Traits ◽

Trophic State ◽

Seasonal Succession ◽

Phytoplankton Communities

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The state of hydrobionts in the Tyub‐Karagan Bay structure, Kazakhstan

South of Russia ecology development ◽

10.18470/1992-1098-2021-1-138-150 ◽

2021 ◽

Vol 16 (1) ◽

pp. 138-150

Author(s):

A. Kenzhegaliev ◽

A. Sh. Kanbetov ◽

A. A. Abilgazieva ◽

A. К. Sakhmanova ◽

D К. Kulbatyrov

Keyword(s):

Species Richness ◽

Species Diversity ◽

Species Composition ◽

Seasonal Dynamics ◽

Growing Season ◽

The State ◽

Average Weight ◽

Research Station ◽

Phytoplankton Communities ◽

Quantitative Indicators

Aim. The purpose of the research was to study the state of hydrobionts in the Tyub‐Karagan Bay structure by season for a comparative analysis of their state with previous studies by the authors.Material and Methods. The conditions of hydrobionts (phyto, zoo‐plankton and macrozoobenthos) of the Tyub‐Karagan Bay structure have been studied for three seasons. Studies were carried out by traditional methodology.Results. The species composition of phytoplankton communities in spring was found to be less constant than in autumn; this is associated with heterogeneity in external conditions at the beginning of the growing season. The seasonal dynamics of zooplankton conformed to certain patterns. As a rule, from the beginning to the end of the growing season there was an enrichment of species composition and an increase in the quantitative indicators of zooplankton communities. The highest biomass was formed by bottom cenoses, where large mollusks play a leading role.Conclusion. During the 2018 research period, species richness and species diversity of phytoplankton were at a high level. Representatives of two categories were observed most often. Blue‐green dominated in number, while diatoms formed the basis of biomass. Species richness and species diversity of zooplankton was at a low or moderate level and most often constant. The seasonal dynamics of macrozoobenthos had common and specific features, depending on the research station location. Disproportionate changes in the quantitative indicators of bentonites are associated with a decrease in the average weight of individuals by autumn. This happened both through the strengthening of the role of small species and by an increase in the proportion of younger age stages in populations of bottom invertebrates.

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