Coastal marine megaripple fields are metabolic hotspots with highly dynamic oxygen exchange

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Peter Berg, Markus Huettel
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Abstract

Megaripples are current-generated seafloor bedforms of well-sorted sand or gravel and wavelengths over 1 m. In this aquatic eddy covariance study, we measured large rates of benthic primary production and respiration for a shallow-water sandy megaripple field exposed to strong tidally driven currents and intense sunlight. Current and light were the main short-term drivers of a highly dynamic oxygen exchange. Daytime oxygen release as high as 300 mmol m−2 d−1 and nighttime oxygen uptake up to −100 mmol m−2 d−1 were likely sustained by current-driven transport of oxygen, nutrients, and organic matter (fuel) into and out of the sand and superimposed by rapid internal cycling. Seasonal differences in temperature (45%) and light (69%) between April and September were the main long-term drivers of substantially greater rates of gross primary production and respiration in September. The megaripples functioned as an intense metabolic hotspot with carbon cycling rates larger than those of most near-shore sediments.

Abstract Image

沿海海洋巨虹膜场是具有高动态氧交换的代谢热点
巨波纹是由水流形成的海底地层,由分类良好的沙子或砾石组成,波长超过1米。在这项水生涡旋相关研究中,我们测量了暴露在强烈潮汐驱动的水流和强烈阳光下的浅水沙质巨型水田的底栖生物初级生产和呼吸的大速率。电流和光是高动态氧交换的主要短期驱动因素。白天氧气释放高达300 mmol m - 2 d - 1,夜间氧气摄取高达- 100 mmol m - 2 d - 1,这可能是由氧气、营养物质和有机物(燃料)的电流驱动运输和快速内部循环叠加而成的。4月至9月间温度(45%)和光照(69%)的季节性差异是9月总初级生产和呼吸速率显著提高的主要长期驱动因素。巨水波是一个强烈的代谢热点,其碳循环速率大于大多数近岸沉积物。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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