Grain size distribution of Wadden Sea sediment used in an experiment on sediment exposure of juvenile Caryophyllia (Caryophyllia) huinayensis@en

This table shows the grain size distribution of sediment used for a 12-week sediment exposure experiment, to test how juvenile Caryophyllia (Caryophyllia) huinayensis perform under increased sedimentation. Surface (1 cm) sediment samples were collected from the Wadden Sea in front of Spieker-Neufeld in October 2020 and February 2021. Prior to the use in the experiment, the sediment was sieved into fractions that were mixed proportionally to match the size range of the sediments in Comau Fjord (approx. 42°11' – 42°29'S and 72°35' – 72°22'E, a natural habitat of C. huinayensis). Organic carbon was then removed with H2O2 until the reaction stopped and the sediment was washed for neutralisation. Grain size measurements of the sediment used in the experiments were performed before, during and after the experiment in the Particle-Size Laboratory at MARUM, University of Bremen with a Beckman Coulter Laser Diffraction Particle Size Analyzer LS 13320 that provides grain size distributions in the size range from 0.04 to 2000 μm, divided into 116 size classes.本表格呈现了一项为期12周沉积物暴露实验所用沉积物的粒度分布，该实验旨在探究幼体惠那伊石珊瑚（Caryophyllia (Caryophyllia) huinayensis）在沉积物沉降加剧条件下的生存表现。2020年10月与2021年2月，研究人员于斯皮克尔-诺伊费尔德（Spieker-Neufeld）前方的瓦登海（Wadden Sea）采集了表层1 cm沉积物样品。实验开展前，先将沉积物过筛分级并按比例混合，以匹配惠那伊石珊瑚自然栖息地科马约湾（Comau Fjord，约南纬42°11′~42°29′、东经72°35′~72°22′）的沉积物粒径范围。随后采用过氧化氢（H₂O₂）去除沉积物中的有机碳，直至反应完全停止，再通过水洗完成中和处理。实验所用沉积物的粒度检测分别于实验前、实验期间及实验后开展，检测工作依托不来梅大学MARUM海洋环境科学中心粒度实验室完成，所用仪器为贝克曼库尔特（Beckman Coulter）LS 13320型激光衍射粒度分析仪，该设备可在0.04 μm至2000 μm的粒径范围内划分116个粒径等级并输出粒度分布数据。