Seasonal dynamics in water quality and phytoplankton of four tropical rivers in Ebonyi State, southeastern Nigeria

Analysis of 4 sampling surveys on Jiangsu Shilianghe reservoir in May, July and October of 2011 and January of 2012, 109 species of algae belonging to 7 divisions were totally identified. The green algae and diatoms were the main species while Euglena and Cryptomonas were rare. The algal cell density in each season was compared as follows: summer (63.77 × 1000000 / L) > autumn (61.87 ×1000000 / L) > spring (43.31 ×1000000 / L) > winter (37.922 ×1000000 / L). Algae Shannon-Wiener index and Pielou indexes of each season were compared and described as follows: summer (2.71, 0.41) > winter (2.09, 0.32) > autumn (2.05, 0.31) > spring (1.85, 0.28). The Margalef indexes of each season were compared as follows: summer (1.51) > spring (1.38) > autumn (1.19) > winter (0.86). The water quality was assessed as α-medium pollution according to biological indicators. Sand mining, cages and obstruction between rivers and lakes may be the main reasons that lead to high algal cell density and low index of species diversity.

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Morphological abnormalities in caddisfly larvae (Hydropsyche doctersi) as indicator of water quality in tropical rivers

Journal of Entomological Research ◽

10.5958/0974-4576.2020.00047.x ◽

2020 ◽

Vol 44 (2) ◽

pp. 267

Author(s):

Suhaila Ab Hamid ◽

Mohd Fakhrullah Salafusalam Mohd Afandi ◽

Veera Singham A/L K. Ganesan ◽

Nur Aida Hashim ◽

Salman Abdoo Al-Shami

Keyword(s):

Water Quality ◽

Tropical Rivers ◽

Morphological Abnormalities ◽

Caddisfly Larvae

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SEASONAL DYNAMICS OF ZOOBENTHOS STRUCTURE IN THE LOW REACHES OF THE DUKCHA RIVER (MAGADAN REGION) AND ASSESSMENT OF WATER QUALITY BY GROUP COMPOSITION

Vladimir Ya. Levanidov’s Biennial Memorial Meetings ◽

10.25221/levanidov.09.21 ◽

2021 ◽

Vol 9 ◽

Author(s):

E.V. Khamenkova ◽

◽

D.A. Kondakova ◽

A.B. Krasheninnikov ◽

◽

...

Keyword(s):

Water Quality ◽

Seasonal Dynamics ◽

Group Composition ◽

Magadan Region

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The seasonal dynamics of phytoplankton and water quality in the Prut River lower sector

10.53937/icz10.2021.07 ◽

2021 ◽

Author(s):

Laurenţia Ungureanu ◽

◽

Daria Tumanova ◽

Grigore Ungureanu ◽

◽

...

Keyword(s):

Water Quality ◽

Seasonal Dynamics ◽

Phytoplankton Composition ◽

Republic Of Moldova ◽

Qualitative And Quantitative ◽

The Republic ◽

Quantitative Indicators ◽

Prut River

The article presents the results on qualitative and quantitative indicators of phytoplankton of the Prut River lower sector within the Republic of Moldova in 2018-2020. In phytoplankton compositions 72 species were identified. Seasonal and long-term patterns of phytoplankton development have been established in Prut River lower sector. The numbers of phytoplankton changed within the limits 1,06 to 20,32 mln. cell/l, with biomass 1,23-21,64 g/m3. The values of saprobic indexes, estimated on the basis of species-indicators (52 species) from phytoplankton composition, which are in proportion of 58% typically β-mezosaprobic, confirm the following: the water quality of lower Prut River sector in the period 2018-2020 was satisfactory for the development of phytoplankton and was attributed mainly to II-III (good-moderately polluted) quality classes.

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