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<p>This study employs an integrated biogeochemical approach to assess labile and refractory carbon fractions in surface sediments of the Beypore Estuary, Southwest India, across contrasting seasons to comprehend the organic matter quality and trophic status. Biochemical analysis revealed the conspicuous dominance of carbohydrates (79.3%) in the labile organic matter pool, over proteins and lipids (9.4% and 11.3%, respectively). Stable carbon isotope signatures (δ<sup>13</sup>C values, − 28.023 to − 19.857‰) confirmed substantial terrestrial organic matter inputs, particularly during the wet periods. The benthic environment exhibited a meso-oligotrophic state, while the water column parameters indicated a delicate balance near the meso-eutrophic threshold, reflecting increased nutrient enrichment during the wet season. This study demonstrates the complex seasonal interplay between hydrological variability, terrestrial organic matter loading, and biogeochemical processes on the estuarine productivity, making it indispensable to develop a sustainable management strategy.</p>

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Biogeochemistry and trophic state assessment of a tropical estuary during contrasting seasons and associated management challenges

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Cindrella Joy Joseph,
  • Rose Santhosh,
  • Digila Rani M.,
  • Ihjas K.,
  • Naveena K.,
  • Renjith K R

摘要

This study employs an integrated biogeochemical approach to assess labile and refractory carbon fractions in surface sediments of the Beypore Estuary, Southwest India, across contrasting seasons to comprehend the organic matter quality and trophic status. Biochemical analysis revealed the conspicuous dominance of carbohydrates (79.3%) in the labile organic matter pool, over proteins and lipids (9.4% and 11.3%, respectively). Stable carbon isotope signatures (δ13C values, − 28.023 to − 19.857‰) confirmed substantial terrestrial organic matter inputs, particularly during the wet periods. The benthic environment exhibited a meso-oligotrophic state, while the water column parameters indicated a delicate balance near the meso-eutrophic threshold, reflecting increased nutrient enrichment during the wet season. This study demonstrates the complex seasonal interplay between hydrological variability, terrestrial organic matter loading, and biogeochemical processes on the estuarine productivity, making it indispensable to develop a sustainable management strategy.