Fine-scale vertical distribution and diel migrations of Pyrosoma atlanticum in the northern California Current
Fine-scale vertical distribution and diel migrations of Pyrosoma atlanticum in the northern California Current
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北加州洋流中大西洋火虫的细尺度垂直分布和昼夜迁移
DOI：
10.1093/plankt/fbac006
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发表时间：
2022
影响因子：
2.1
通讯作者：
Koski, ed., Marja
中科院分区：
文献类型：
--
作者：
Lyle, Joanna T.;Cowen, Robert K.;Sponaugle, Su;Sutherland, Kelly R.;Koski, ed., Marja
2014年至2018年，殖民地远洋被囊动物Pyrosoma atlanticumin的爆发发生在东太平洋的海洋热浪之后。焦小体水华通过主动运输、粪粒产生和死亡事件加速生物泵，改变了北方加州海流（NCC）的浮游食物网。虽然P.大西洋有可能通过碳输出来塑造海洋营养动态，但对焦质体垂直分布模式知之甚少。在这项研究中，我们估计了P的分布。2018年2月和7月期间，美国俄勒冈州（45°N和124°W）和北方加州（41°N和124°W）附近NCC沿着的大西洋。深度分层的浮游生物丝束提供体积归一化的焦质体丰度和生物量的估计，补充精细尺度计数垂直部署的相机系统。2月，火体鱼在近海大量出现，特别是在俄勒冈州近海。菌落分布不均匀的水柱与环境参数，特别是密度和叶绿素a的垂直梯度相关的峰值数。垂直分布在24小时内转移，昼夜垂直迁移的指示。了解这些凝胶状食草动物在NCC的垂直分布提供了洞察他们的行为和生态作用，在生物生产温带生态系统的条件变得更加有利于经常性的水华。
Blooms of the colonial pelagic tunicatePyrosoma atlanticumin 2014–2018 followed a marine heatwave in the eastern Pacific Ocean. Pyrosome blooms could alter pelagic food webs of the northern California Current (NCC) by accelerating the biological pump via active transport, fecal pellet production and mortality events. Although aggregations ofP. atlanticumhave the potential to shape marine trophic dynamics via carbon export, little is known about pyrosome vertical distribution patterns. In this study, we estimated the distribution ofP. atlanticumin the NCC along transects off of Oregon (45°N and 124°W) and northern California (41°N and 124°W), USA during February and July 2018. Depth-stratified plankton tows provided volume-normalized pyrosome abundance and biovolume estimates that complemented fine-scale counts by a vertically deployed camera system. Pyrosomes were numerous offshore during February, especially off Oregon. Colonies were distributed non-uniformly in the water column with peak numbers associated with vertical gradients in environmental parameters, notably density and chl-a. Vertical distributions shifted over the 24-h period, indicative of diel vertical migration. Understanding the vertical distribution of these gelatinous grazers in the NCC gives insight to their behavior and ecological role in biologically productive temperate ecosystems as conditions become more favorable for recurring blooms.