http://scholars.ntou.edu.tw/handle/123456789/23672
標題: | Effects of Salinity on Abiotic Aggregation of Organic Matter and Subsequent Microbial Responses | 作者: | Chen, Tzong-Yueh Skoog, Annelie |
關鍵字: | aggregation;particulate organic carbon;amino acids;neutral aldose;roller table | 公開日期: | 1-十二月-2022 | 出版社: | MDPI | 卷: | 8 | 期: | 12 | 來源出版物: | GELS | 摘要: | Studies of marine aggregation have focused on determining formation rates of larger particles from small particles. However, it has been shown that particles can form from the dissolved phase, which includes colloidal material. The purpose of this study was to investigate the effect of aggregation on the chemical composition of both the dissolved and particulate phases in two salinity regimes: (1) the coast of Avery Point, Connecticut, USA (AP; salinity of 30.1 psu); (2) the estuary of Thames River, Connecticut, USA (TR; salinity of 5.0 psu). The samples were incubated on a roller table for two days in the dark at a speed of 8 rpm. The mixed collision mechanism of shear and differential sedimentation provided by the roller table enhanced the gross aggregation of particulate organic carbon (POC; 0.75 mu M d(-1) and 1.04 mu M d(-1) in AP and TR, respectively). Subsequent microbial degradation led to a negative net aggregation of POC (-5.20 mu M d(-1) and -1.19 mu M d(-1) in AP and TR, respectively). Although bacterial abundance remained in a narrow range in this study, the aggregation of organic matter (OM) enhanced planktonic community respiration (CR; CR increased 5.1 mg-C m(-3) d(-1) and 205.4 mg-C m(-3) d(-1) in AP and TR, respectively). The collision also led to a gross aggregation of uncharacterized particulate organic matter (POM) transferred from uncharacterized dissolved organic matter (DOM; 0.62 mu M-C d(-1) and 0.56 mu M-C d(-1) in AP and TR, respectively). The aggregated, uncharacterized POM could be biologically refractory. The C- and N-yields and enrichment factor (EF) analysis indicated that the organic substrate dynamics in this study were complicated. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/23672 | DOI: | 10.3390/gels8120836 |
顯示於: | 海洋環境與生態研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。