JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
About Journal
    Home
    Obituary: Dr. R. C. Dalela
    Editorial Board
    Reviewer Panel
    Publication Policies
    Guidelines for Editors
    Guidelines for Reviewers
    Abstracting and Indexing
    Subscription and Payments
    Contact Journal
    About Triveni Enterprises
 
Read Journal
    Current Issue
    Journal Archives
 
For Authors
    Guidelines for Authors
    Terms and Conditions
    Author Resources
    Fees and Payments
    Track Paper Status
 

Google Search the Journal web-site:


    Abstract - Issue Mar 2021, 42 (2)                                     Back


nstantaneous and historical temperature effects on a-pinene

Environmental factors influencing methanogenic activity in two contrasting tropical lake sediments

 

S.G.T. Vincent1*, J.H. Salahudeen1, P.S. Godson1, S.R. Abhijith1, A.V. Nath1, K.A. Krishnan2, N.S. Magesh3, S.K. Kumar4 and S.A. Moses5 

1Department of Environmental Sciences, University of Kerala, Kariavattom Campus, Thiruvananthapuram-695 581, India

2National Centre for Earth Science Studies, Thiruvananthapuram-695 011, India

3National Centre for Polar and Ocean Research, Goa-403 804, India

4Institute for Ocean Management, Anna University, Chennai-600 025, India

5Kerala State Pollution Control Board, Thiruvananthapuram-695 004, India

*Corresponding Author Email : salom@keralauniversity.ac.in

 

Received: 03.02.2020                                                                      Revised: 21.06.2020                                                   Accepted: 24.11.2020

 

 

Abstract

Aim: To investigate the influence of environmental variables on the abundance and activity of methanogenic archaea (MA) in Akkulam-Veli and Vellayani Lake sediments.

Methodology: Sediment and overlying water samples (n=5 each) were collected from Veli and Vellayani lakes of Thiruvananthapuram, Kerala. Samples were analysed for environmental variables using standard protocols. Multivariate analysis was done to study the influence of environmental variables on abundance and activity of MA.

Results: Environmental variables of overlying water and sediment showed significant variation between the two lakes. Salinity and sulphate were more in Akkulam-Veli than Vellayani, as Akkulam-Veli is a brackish lake and temporarily connected with Arabian Sea. Highly reduced sediments of Akkulam-Veli favoured more population of methylotrophic and acetoclastic MA than Vellayani. A distributional difference of MA with depth was observed in both lakes, which is attributed to availability of more labile organic matter. The methylotrophic MA activity was not significantly different between the two lakes; however, their abundance was significantly different. Nevertheless, methane production was higher in Vellayani than in Akkulam-Veli Lake.  PCA revealed that Corg and labile organic matter (LOM) were the important environmental variables influencing methane production potential.               

Interpretation: Anthropogenic activities like sewage and waste disposal results in increased input of organic matter in lake sediments. The labile organic matter fraction in the sediments favours methanogenic activity thereby resulting in methane production and release from the lakes.      

Key words: Labile organic matter, Methanogenic archaea, Methane production, Sulphate reduction, Tropical lakes

 

 

 

Copyright © 2021 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).