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    The present study assessed the trophic status of a medium-sized microtidal estuary, Rushikulya, India using a combination of mutimetric trophic indices (TRIX, TRBIX) and a machine learning approach (Random Forest). A total of 108 samples were considered to build a predictive model for chlorophyll a (Chl a) and 17 response water variables by observing two annual periods (2021-2023) at six sampling sites. Mean values of TRIX (5.04 ± 0.72) and TRBIX (0.17 ± 0.08) reflected that the estuary has a moderate degree of eutrophication with 'good' water quality and 'biomass saturated'. However, the threshold of TRIX represents a transition state from 'moderate' to 'high' eutrophic. Random Forest model reflected that no apparent association between Chl a and water turbidity above 30 NTU and eutrophication in the estuary fluctuated mainly due to PO43--P along with electrical conductivity. Linear statistical correlations showed high correlation between Chl a and conductivity and a negative correlation between Chl a and dissolved oxygen, unlike PO43--P. Copyright © 2024 Elsevier Ltd. All rights reserved.


    Pranab Gogoi, Sanjoy Kumar Das, Chayna Jana, Basanta Kumar Das, Ajoy Saha, Karankumar Ramteke, A K Jaiswar, S Samanta, C M Roshith. Assessing the trophic status of a tropical microtidal estuary applying TRIX and Random Forest - A combined approach. Marine pollution bulletin. 2024 Mar;200:116126

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    PMID: 38330813

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