Bacillariophyceae as Indictors of Ecological Status in Kabini River

Deepa Prabhakar Maishale; Savitha Ulavi

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25-Mar-23

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Bacillariophyceae as Indictors of Ecological Status in Kabini River

Author(s):

Deepa Prabhakar Maishale , Sri jayachamrajendra engineering college; Savitha Ulavi, Sri jayachamrajendra engineering college

Keywords:

Bacillariophyceae, Biomonitoring, Ecological Indicators, Pollution

Abstract:

Bacillariophyceae are widely used for the bioassessment of lakes and river due to their broad distribution and their ability to integrate changes occurring in water composition and quality. The objective of current research is to evaluate the Kabini river ecology using diatoms communities as indicators. Water and diatoms samples were collected from Kabini river, Mysuru (India). Louis Laclercq IDSE/5 index is derived from the OMINIDIA 5.3 software. In the currents study total 11 species of diatoms are identified. Variations and abundance in the number of species is observed throughout the study period. The present study states that Kabini river water is Circumneutral throughout the period of study with high levels of chloride. According to the salinity values the water is considered as fresh brackish with chloride levels always less than 500 mg-1 and the salinity values are less than 0.9. The river water supports nitrogen autotrophic diatoms that tolerate elevated levels of organically bound nitrogen. Oxygen requirements of diatoms quite often vary from season to season. Alpha–meso-saprabous conditions prevail, where the water class becomes III, oxygen saturation reaches 25-85% and BOD levels become 4-13 mg/L. All diatom species occurring in the river are strictly moisture tolerant. Although organic pollution in the river ranges between nonexistent to moderate, the indicator species of organic pollution are Gomphonema Paravalum, Amphora Ovalis, Synedra Acus and Synedra Ulna and the percentage of organic pollution ranges between a minimum of 9.14 % during summer and 28.57 % during monsoon. Synedra Acus, Synedra Ulna, Amphora Ovalis are the prime indicators of anthropogenic eutrophication. The number of diatom species is high during summer and least during winter; evenness of species with small variations is predominant.