Vertical distributions of blooming cyanobacteria populations in a freshwater lake from LIDAR observations
Vertical distributions of blooming cyanobacteria populations in a freshwater lake from LIDAR observations
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DOI：
10.1016/j.rse.2019.02.025
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发表时间：
2019-05-01
影响因子：
13.5
通讯作者：
Ruberg, Steven A.
中科院分区：
文献类型：
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作者：
Moore, Timothy S.;Churnside, James H.;Ruberg, Steven A.
淡水蓝藻种群的垂直分布对于浮游生物群落结构、生态以及影响与遥感相关的水体光学特性非常重要。 2014 年 8 月，我们利用激光雷达和数字全息系统等新技术检查了伊利湖西部盆地蓝藻水华的垂直结构。此外，还制作了环境和光学特性的垂直剖面。主动激光雷达穿透水体，提供整个水体颗粒分布的详细图像。全息系统提供经过处理的数字图像，用于微囊藻和浮丝菌（存在的两个主要蓝藻属）的颗粒大小、计数和识别。根据最接近的匹配，LIDAR 反向散射强度与全息蓝藻细胞计数之间的相关性平均为 0.53，范围为 -0.13 至 0.96。整个蓝藻种群的垂直结构受到风速的影响，并在较小程度上受到地表水的太阳加热的影响。在更详细的层面上，微囊藻种群相对于浮游藻种群始终更接近地表。表面样本的色素显示，以浮游丝菌为主的群落具有更高程度的光保护作用。蓝藻属的垂直分布与水柱中的光强度以及每个属的已知耐受性和/或偏好有关。光学特性的垂直分布支持激光雷达和全息数据中看到的图案，并对出射光场有直接影响。这些组合数据为蓝藻空间（垂直和水平）分布模式的自然变化及其对遥感检测和相关解释的影响提供了独特的视角，并证明了这些技术在湖泊环境中观察蓝藻的潜力。
The vertical distributions of freshwater cyanobacteria populations are important to plankton community structure, ecology and for influencing water column optical properties relevant to remote sensing. In August of 2014, we examined the vertical structure of a cyanobacteria bloom across the western basin of Lake Erie with new technologies, including LIDAR and a digital holographic system. In addition, vertical profiles of environmental and optical properties were made. The active LIDAR penetrated the water column, and provided a detailed picture of the particle distribution for the whole water column. The holographic system provided digital images processed for particle size, count and identification of Microcystis and Planktothrix - the two main cyanobacteria genera that were present. The correlations between the LIDAR backscatter intensity and the cyanobacteria cell counts from holography averaged to 0.53 and ranged from -0.13 to 0.96 based on nearest matchups. The vertical structure of the overall cyanobacteria population was influenced by wind speed, and to a lesser degree the solar heating of surface waters. On a more detailed level, Microcystis populations were consistently nearer to the surface relative to Planktothrix. Pigments from surface samples revealed a higher degree of photoprotection for Planktothrix-dominated communities. The vertical distributions of the cyanobacteria genera were related to light intensity in the water column and known tolerances and/or preferences for each genus. Vertical profiles of optical properties supported the patterns seen in the LIDAR and holographic data, and had direct implications on the exiting light field. These combined data provide a unique view into the natural variations in spatial (vertical and horizontal) distribution patterns of cyanobacteria and resulting impacts on remote sensing detection and associated interpretations, and demonstrate the potential for these technologies to observe cyanobacteria in lake environments.