On plankton distributions and biophysical interactions in diverse coastal and limnological environments
On plankton distributions and biophysical interactions in diverse coastal and limnological environments
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关于不同沿海和湖泊环境中的浮游生物分布和生物物理相互作用
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
J. Sullivan
中科院分区：
文献类型：
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作者：
A. R. Nayak;M. McFarland;M. Twardowski;J. Sullivan
数字全息为研究水生粒子/生物提供了一个独特的视角。在不受干扰的条件下对粒子进行采样的能力，加上生成三维空间分布的能力，是目前任何其他技术都无法比拟的。为了利用这些优势，利用水下全息成像系统进行了现场实验，目的是在原位表征水生颗粒的特性。在2014年至2017年期间，通过3次不同的部署对不同的水生环境进行了采样。这些地区包括：(a)密西西比河沿岸的墨西哥湾；(b)伊利湖；(c)美国太平洋西北部的东湾。在处理了10万张全息图后，建立了一个数据库，其中包含了200多万种不同类型的粒子，大小在10-10000米之间。粒度分布（psd）表现为丛林型分布，当粒度分组成对数间隔的桶时。颗粒/浮游生物也被划分为不同的类群（如硅藻、桡足类）。所提出的结果将大致分为两部分：(a)伊利湖微囊藻爆发时水柱内不同深度的pds和这些菌落内的单个细胞计数；(b)东湾浮游生物的垂直结构，特别是硅藻薄层的存在。最后，将简要讨论GoM中物种组成的丰富多样性和成功的数据收集，以创建一个训练集来实现自动分类例程。
Digital holography provides a unique perspective towards studying aquatic particles/organisms. The ability to sample particles in undisturbed conditions, coupled with the ability to generate 3-D spatial distributions is currently unmatched by any other technique. To leverage these advantages, field experiments with the goal of characterizing aquatic particle properties in situ, were conducted using a submersible holographic imaging system. Diverse aquatic environments were sampled over 3 separate deployments between 2014 and 2017. The areas included: (a) The Gulf of Mexico (GoM), in the vicinity of the Mississippi river plume; (b) Lake Erie; and (c) East Sound in the US Pacific Northwest. A database of more than two million different types of particles in the 10-10000 m size range, was created after processing > 100,000 holograms. Particle size distributions (PSDs) exhibited a Junge-type distribution when characterized by size grouping into logarithmically spaced bins. Particles/plankton were also classified into different groups (e.g. diatoms, copepods). Results presented will be broadly grouped into two parts: (a) PSDs at different depths within the water column during the occurrence of a Microcystis bloom at Lake Erie and individual cell counts within these colonies; and (b) Vertical structure of plankton in East Sound, specifically the presence of diatom thin layers. Finally, the rich diversity in species composition in the GoM and successful data collection towards creating a training set to implement automated classification routines will be briefly discussed.