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Scallop farming impacts on dissolved organic matter cycling in coastal waters: Regulation of the low molecular weight fraction. | LitMetric

Scallop farming impacts on dissolved organic matter cycling in coastal waters: Regulation of the low molecular weight fraction.

Mar Environ Res

CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, 264003, China; Shandong Key Laboratory of Coastal Environmental Processes, Yantai, Shandong, 264003, China.

Published: November 2024

AI Article Synopsis

  • The study investigates how scallop farming impacts the characteristics of low molecular weight (LMW) dissolved organic matter (DOM) in a mariculture area and its surroundings through absorption and fluorescence spectroscopy.
  • Results show that DOM absorption was highest in inshore areas, with scallop farming leading to significant changes in phytoplankton and microbial activity affecting DOM composition.
  • Over time, protein-like substances from scallop farming were found to degrade into LMW substances quickly, while the degradation of humic-like substances lessened, indicating different degradation rates for these components.

Article Abstract

To elucidate the impacts of scallop farming on the biogeochemical characteristics of low molecular weight (LMW, <1 kDa) dissolved organic matter (DOM), samples collected from a bay scallop mariculture area (MA) and its surrounding areas were determined for absorption and fluorescence spectroscopy after microfiltration and centrifugal ultrafiltration. The values of absorption coefficient a showed a spatial variation trend of inshore area (IA) > MA > non-mariculture area (NMA) for both bulk (<0.7 μm) and LMW fractions. Four fluorescent components, namely two protein-like components (tryptophan-like C1 and tyrosine-like C2) and two humic-like components (microbial humic-like C3 and terrestrial humic-like C4), were identified. Scallop farming influenced DOM transformation by altering phytoplankton abundance and promoting microbial degradation. In July, the net contributions of phytoplankton to the spectroscopy parameters of LMW-DOM in the surface seawater were 11.0% for a, 4.3% for C1, 0.8% for C2, 0.6% for C3 and 3.0% for C4, respectively; the corresponding values of bulk DOM in the surface seawater were 24.3% for a, 20.1% for C1, 5.9% for C2, 2.0% for C3, 2.9% for C4, respectively. Compared with NMA, the contributions of microbial degradation to a in MA's surface seawater increased by 9.0% for LMW-DOM and 6.9% for bulk DOM in July; however, the effects on different fluorescent components varied. In August, compared with NMA, the contributions of microbial degradation to spectroscopy parameters in the bottom water of MA decreased by 35.7% for a, 6.3% for C2, 1.3% for C3, and 4.4% for C4 for LMW-DOM fraction; for bulk DOM, the corresponding contribution decreased by 10.8% for C1. These variations indicate that protein-like substances from scallop aquaculture are easily degraded into LMW substances, while humic-like substances degradation diminishes over time.

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Source
http://dx.doi.org/10.1016/j.marenvres.2024.106796DOI Listing

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