Summer deoxygenation in a bay scallop (Argopecten irradians) farming area: the decisive role of water temperature, stratification and beyond

Highlights

  • Significant oxygen depletion in seawater was observed in the summertime.
  • Temperature was the main driver of summer deoxygenation in seawater.
  • DO dynamic was dominated by temperature-induced physical and biochemical processes.
  • Scallop respiration had little effect on DO dynamic in seawater.
  • Hypoxia and acidification were associated with the water column structures.

Abstract

During 2015–2020, 26 cruises were carried out in a bay scallop farming area, North Yellow Sea, to study the dissolved oxygen (DO) dynamics and its controlling factors. Significant DO depletion (deoxygenation) was observed in the summertime with the decrease rates of 0.31–0.55 and 0.96–2.10 μmol d−1 in the surface and bottom waters, respectively, which were comprehensively forced by temperature, photosynthesis and microbial respiration. Seasonally, temperature was the main driver of the deoxygenation processes. In the surface water, DO dynamics were dominated by temperature-induced solubility changes, while the photosynthesis offset the effects of physical processes to a certain extent; in the bottom water, its dynamics were mainly attributed to the comprehensive control of temperature-induced solubility changes and biological respiration. Overall, the results suggested that the occurrence of hypoxia and acidification in the coastal waters were highly associated with the formation of temperature-induced stratification under complex hydrodynamic processes.

Yang B., Gao X., Zhao J., Liu Y., Xie L., Lv X., Xing Q., 2021. Summer deoxygenation in a bay scallop (Argopecten irradians) farming area: the decisive role of water temperature, stratification and beyond. Marine Pollution Bulletin 173 (Part B): 113092. doi: 10.1016/j.marpolbul.2021.113092. Article (subscription required).


  • Reset

Subscribe

OA-ICC Highlights


%d bloggers like this: