Environmental changes and their effects on carbon isotope distribution in Lake Plateliai over the past 130 years: insights from sediment organic fractions and diatom assemblages.

C/N values showed a decreasing trend from 10.4 to 8.2 throughout the study period, which could be an indication of decreasing allochthonous matter content in the sediments, an increase in primary producers, shifts in their community composition, or all three ( S4 Fig .).

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This increase coincided with a significant shift in the diatom community, suggesting a possible trend of nutrient enrichment in the lake ecosystem.

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Organic matter (OM) accumulation rate values ( Fig 2C ) ranged from 0.0032 g/cm 2 /y to 0.0113 g/cm 2 /y exhibiting an increasing trend with maximum values of 0.0084 g/cm 2 /y, 0.0132 g/cm 2 /y, 0.0115 g/cm 2 /y at the depth of 33–25 cm (1904–1945), at 16–10 cm (1973–1992), and 6–0 cm (2002–2013), respectively.

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