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Molecular tracers for characterization and distribution of organic matter in a freshwater lake system from the Lesser Himalaya

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Abstract

The knowledge of distribution and sources of organic matter (OM) in aquatic systems is important to understand the biogeochemical cycling of carbon in terrestrial environments. In this study, we have evaluated quantitative contributions of OM sources and their distribution using bulk geochemical parameters (TOC and δ13Corg), n-alkane indices and source specific biomarkers (C20 highly branched isoprenoid (HBI)) in Renuka Lake in Lesser Himalaya. The principal sources of OM in the sediments were aquatic productivity with minor input from terrestrial plants, which varied from littoral to central part of the lake. The microbial community in Renuka Lake were established using short chain n-alkanes and C20 HBI, whereas pristane/phytane (Pr/Ph) depicts depositional condition of the lake system. The land use/land cover changes and grain size analysis were used to investigate the multiple reasons and processes that govern the spatial heterogeneity of the distribution of sedimentary OM. The results show that human activities and alterations of the aquatic landscape can significantly affect the composition and distribution of OM in aquatic systems. The present study shows that elucidating the sources and distribution of OM in an aquatic system is crucial for constraining the ecological status and aiding conservation measures.

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Acknowledgements

AA and SB gratefully acknowledge the National Mission for Himalayan Studies (NMHS), Ministry of Environment, Forest & Climate Change (MoEF&CC), Government of India for the financial support provided under the grant NMHS/2018-19/SG49/49. We are grateful to PRISM group members for their assistance in the field work. We thank Dr. P.K Mishra, Dr. Deepak Jha, Dr. Yadav Ankit and Mehta Bulbul for useful discussions. We are also thankful to the Forest Department, Himachal Pradesh for providing necessary permission to conduct the field work and surveys.

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Funding was provided by NMHS (NMHS/2018-19/SG49/49).

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Correspondence to Ambili Anoop.

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Responsible Editor: Feng Zhou.

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10533_2022_984_MOESM1_ESM.pdf

Supplementary file1 (PDF 212 kb). Fig. S1: Mass spectra of n-C17 and C20 HBI. Fig. S2: Representative chromatogram of n-alkanes of modern vegetal samples. Fig. S3: Representative chromatogram of n-alkanes of microbial mats, Fig S4: Correlation analyses of a) Total n-alkane content and TOC; b) grain size composition withTOC and c) mid-chain n-alkanes and C20 HBI of Renuka lake surface sediments

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Behera, D., Bhattacharya, S., Rahman, A. et al. Molecular tracers for characterization and distribution of organic matter in a freshwater lake system from the Lesser Himalaya. Biogeochemistry 161, 315–334 (2022). https://doi.org/10.1007/s10533-022-00984-y

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  • DOI: https://doi.org/10.1007/s10533-022-00984-y

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