Predominance of terrestrial organic matter in sediments from a cyanobacteria- blooming hypereutrophic lake

Asymmetric response of sedimentary pool to surface water in organics from a shallow hypereutrophic lake: The role of animal consumption and microbial utilization

“…Compared with cyanobacteria, terrestrial plants displayed a relatively lower concentration level, although they spatially fluctuated within the range of other eutrophic lakes (Bechtel and Schubert, 2009). In the sediments, the relatively low level of cyanobacteria was found to be spatiotemporally consistent together with the previous findings (Xu et al, 2015). Generally, there is a loss for organics during sinking, as it is easily subjected the strong influence by aquatic animal consumption and microbial degradation (Meyers and Ishiwatari, 1993;Sarnelle, 1999;Yoshimizu et al, 2001).…”

“…Spatial patterns of bacterial abundance (g g −1 ) in the sediments from Lake Taihu, China. asymmetric phenomena between SPOM and SOM for cyanobacteria and terrestrial plants, which were proposed as the major organics due to the faint contributions of other sources such as diatoms and dinoflagellates to both surface water and sediments (Qin, 2008;Xu et al, 2015). In surface water, not surprisingly, cyanobacteria showed a considerably higher prevalence.…”

“…The fatty acids of 18:36 and 18:43 are introduced as a biomarker of cyanobacteria in Lake Taihu according to the previous findings (Xu et al, 2015). The fatty acids of terrestrial plants include long chain fatty acid (LCFA), i.e.…”

“…In numerous studies, carbon isotope ratios have been applied to evaluate the relative contributions of terrestrial and marine sources to sedimentary organic pool with their obvious discrepancies of isotope ratios in estuarine, coastal and marine environments (Cook et al, 2004;Dunn et al, 2008;Volkman et al, 2008). When assessing various organic matter sources with similar isotope ratios in freshwater lakes, fatty acids have been proven to be more suitable due to their structural diversity, source specificity and relative stability (Bechtel and Schubert, 2009;Xu et al, 2014Xu et al, , 2015. Fatty acid profiles and stable isotope ratios ( 13 C/ 12 C and 15 N/ 14 N) have also been employed to identify food web relationships and the strength of interactions among dominant taxa in aquatic systems (Alfaro et al, 2006;Budge et al, 2007;Kharlamenko et al, 2001).…”

Hydrodynamic‐Driven Changes in the Source and Composition of Sedimentary Organic Matter via Grain Size Distribution in Shallow Lakes

“…Upon reaching the bottom, organic matter is subject to degradation by microorganisms in the sediments. The relatively labile autochtonous organic matter is preferentially used by bacteria, while the turnover of terrestrial plant derivatives can take months to years, considering their pre‐aging before being transported into lakes (Meyers & Eadie, 1993; X. Xu et al., 2015; X. G. Xu et al., 2015). These biological production and consumption processes of organic matter are accompanied by abiotic influences like redox conditions (Yang et al., 2014), water depth (Dong et al., 2014), and temperature (Gudasz et al., 2010), which co‐determine the organic sources of SOM.…”