Determinants of Microbial-Derived Dissolved Organic Matter Diversity in Antarctic Lakes.

ABSTRACT: Identifying drivers of the molecular composition of dissolved organic matter (DOM) is essential to understand the global carbon cycle, but an unambiguous interpretation of observed patterns is challenging due to the presence of confounding factors that affect the DOM composition. Here, we show, by combining ultrahigh-resolution mass spectrometry and nuclear magnetic resonance spectroscopy, that the DOM molecular composition varies considerably among 43 lakes in East Antarctica that are isolated from terrestrial inputs and human influence. The DOM composition in these lakes is primarily driven by differences in the degree of photodegradation, sulfurization, and pH. Remarkable molecular beta-diversity of DOM was found that rivals the dissimilarity between DOM of rivers and the deep ocean, wh

SUBMITTER: Kida M 

PROVIDER: S-EPMC10077579 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature