Contrasting fine‐scale distributional patterns of zooplankton driven by the formation of a diatom‐dominated thin layer
Contrasting fine‐scale distributional patterns of zooplankton driven by the formation of a diatom‐dominated thin layer
复制标题
对比由硅藻为主的薄层形成驱动的浮游动物的精细尺度分布模式
DOI：
--
复制
发表时间：
2020
影响因子：
4.5
通讯作者：
J. Wiggert
中科院分区：
文献类型：
--
作者：
A. Greer;Adam D. Boyette;V. Cruz;M. K. Cambazoğlu;B. Dzwonkowski;Luciano Chiaverano;S. L. Dykstra;C. Briseño‐Avena;R. Cowen;J. Wiggert
虽然浮游生物薄层已被描述和模拟在各种环境中，物理结构周围的层，相关的生物率，和分布的多个营养水平很少同时检查。类似的测量组合，如浮游生物的生长，死亡率和空间关系，是理解产生薄层的物理过程如何影响丰度，组成和捕食者-猎物相互作用的关键。沿沿着向南的样带部署了一个原位成像系统，以描述8至4 m深的薄层的整个~ 2.3 km范围，叶绿素a在该层内增强了一个数量级（23.9 mg m−3峰值浓度）。物理海洋学测量、不同浮游生物群的分布以及高分辨率模式的输出结果表明，表面辐合和垂直切变推动了该层的形成，该层主要由Odontella sp.硅藻组成，在更广泛的研究区域中相对稀少。浮游植物的表观生长（0.64 d−1）平衡了层内微型浮游动物的摄食率（0.52 d−1），而摄食死亡率（2.23 d−1）大大超过了薄层外的浮游植物生长（-0.39 d−1）。中型浮游动物有着截然不同的分布;桡足类聚集在靠近表面的层的南部，而doliolids遵循薄层轨迹。一个物理海洋学模型在一个月的时间内运行，包括采样时间，表明类似的表面收敛经常发生。由会聚和剪切驱动的薄层可能是常见的，浮游生物之间的行为和浮力差异可能有助于群落结构和营养转移的修改。
Although plankton thin layers have been described and modeled in a variety of environments, the physical structure surrounding the layer, associated biological rates, and distributions of multiple trophic levels are rarely examined simultaneously. Similar combinations of measurements, such as growth, mortality, and spatial relationships among plankton, are key to understanding how physical processes generating thin layers can influence abundances, composition, and predator‐prey interactions. An in situ imaging system was deployed along a southward‐oriented transect to describe the full ~ 2.3‐km extent of a thin layer arching from 8 to 4 m deep, with Chlorophyll a enhanced by an order of magnitude inside the layer (23.9 mg m−3 peak concentration). Physical oceanographic measurements, distributions of different plankton groups, and output from a high‐resolution model indicated that surface convergence and vertical shear drove the formation of the layer, which was dominated by Odontella sp. diatoms that were relatively scarce in the broader study region. Phytoplankton apparent growth (0.64 d−1) balanced microzooplankton grazing rates (0.52 d−1) within the layer, whereas grazing mortality (2.23 d−1) greatly exceeded phytoplankton growth (−0.39 d−1) outside the thin layer. Mesozooplankton had starkly differing distributions; copepods aggregated south of the layer near the surface, and doliolids followed the thin layer trajectory. A physical oceanographic model run over a 1‐month time period, including the time of sampling, indicated that similar surface convergences occurred frequently. Thin layers driven by convergence and shear may be common, with behavioral and buoyancy differences among plankton likely contributing to community structure and modification of trophic transfer.
影响因子：
16.6
作者：
Lévy M;Franks PJS;Smith KS
通讯作者：
Smith KS