Comparing Vertical Distributions of Chl-a Fluorescence, Marine Snow, and Taxon-Specific Zooplankton in Relation to Density Using High-Resolution Optical Measurements
Comparing Vertical Distributions of Chl-a Fluorescence, Marine Snow, and Taxon-Specific Zooplankton in Relation to Density Using High-Resolution Optical Measurements
复制标题
使用高分辨率光学测量比较叶绿素 a 荧光、海洋雪和分类群特异性浮游动物的垂直分布与密度的关系
DOI：
--
复制
发表时间：
2020
影响因子：
3.7
通讯作者：
J. Jaffe
中科院分区：
文献类型：
--
作者：
C. Briseño‐Avena;J. Prairie;P. Franks;J. Jaffe
捕食者和猎物之间的相互作用在形成水生生态系统中很重要。然而，这些相互作用很难在与生物体相关的空间尺度上进行原位评估。这项工作提出了高空间分辨率观测夜间垂直分布的个体浮游动物，叶绿素荧光，海洋雪分层的沿海沃茨的南加州湾。使用平面激光成像荧光计（PLIF）获得的数据与浮游动物成像系统（O-Cam）安装沿着辅助传感器的自由下降平台上的阴影增强。荧光计和PLIF传感器检测到两个明确的和不同的峰值：地下叶绿素最大值（SCM）和荧光粒子最大值（FPM）占主导地位的大型海洋雪。的O-Cam成像系统可以可靠的估计浓度的甲壳类动物和凝胶状浮游动物群体，我们发现，食草动物和它们的捕食者有良好的结构和周围的SCM和FPM的夜间分布的方式，建议潜在的捕食者避免在高峰期的SCM和紧接在FPM（捕食水螅水母，并在一定程度上磷虾，主要位于）。哲水蚤桡足类被发现以上的SCM，而剑水蚤与FPM。捕食者和食草动物浓度峰值的位置表明，它们的动态可能会控制垂直梯度定义的SCM和FPM。
Interactions between predators and their prey are important in shaping planktonic ecosystems. However, these interactions are difficult to assess in situ at the spatial scales relevant to the organisms. This work presents high spatial resolution observations of the nighttime vertical distributions of individual zooplankton, chlorophyll-a fluorescence, and marine snow in stratified coastal waters of the Southern California Bight. Data were obtained using a planar laser imaging fluorometer (PLIF) augmented with a shadowgraph zooplankton imaging system (O-Cam) mounted along with ancillary sensors on a free-descent platform. Fluorometer and PLIF sensors detected two well-defined and distinct peaks: the subsurface chlorophyll maximum (SCM) and a fluorescent particle maximum (FPM) dominated by large marine snow. The O-Cam imaging system allows reliable estimates of concentrations of crustacean and gelatinous zooplankton groups; we found that grazers and their predators had well-structured nighttime distributions in and around the SCM and FPM in ways that suggested potential predator avoidance at the peak of the SCM and immediately above the FPM (where predatory hydromedusae, and to some degree euphausiids, were primarily located). Calanoid copepods were found above the SCM while cyclopoids were associated with the FPM. The locations of predator and grazer concentration peaks suggest that their dynamics may control the vertical gradients defining the SCM and FPM.