首页> 外文期刊>Polar biology >Changes in phytoplankton community structure during wind-induced fall bloom on the central Chukchi shelf
【24h】

Changes in phytoplankton community structure during wind-induced fall bloom on the central Chukchi shelf

机译:楚科奇中央陆架风生秋华期间浮游植物群落结构的变化

获取原文
获取原文并翻译 | 示例
       

摘要

The recent increasing of atmospheric turbulence has had considerable impact on the oceanic environment and ecosystems of the Arctic. To understand its effect on phytoplankton community structure, a Eulerian fixed-point observation (FPO) was conducted on the Chukchi shelf in fall 2013. Temporal and vertical distributions of the phytoplankton community were inferred from algal pigment signatures. A strong wind event (SWE) occurred during the observation term, and significant convection supplied nutrients from the bottom layer to the surface. Before the SWE, pigment composition in the warmer, less saline, and nutrient-poor surface waters was diverse with low concentration of chlorophyll-a (chla). Vertical mixing induced by the SWE weakened the stratification and brought sufficient nutrients to enhance diatom-derived pigment concentrations (e.g., fucoxanthin and chlc3), suggesting increases in diatoms. We also developed a model to predict the distribution of major phytoplankton pigment/chla ratios using a profiling multi-wavelength fluorometer (Multi-Exciter) with higher spatio-temporal resolution. The Multi-Exciter also captured changes in pigment composition with environmental changes at the FPO site and at four observation sites 16 km from the location of the FPO. Furthermore, we investigated the change in grazing rates of the major Arctic copepod Calanus glacialis copepodid stage five to assess the interaction between primary and secondary producers during the fall bloom. Increased diatom biomass caused a significant increase in the grazing rate on microphytoplankton ( 20 A mu m) and a decrease on nanophytoplankton (2-20 A mu m), indicative of a strong cascade effect because of the reduction of microzooplankton due to the grazing from C. glacialis. We conclude that SWEs during fall might affect food webs via the alternation of seasonal succession of phytoplankton community structure.
机译:近期大气湍流的增加对北极的海洋环境和生态系统产生了相当大的影响。为了了解其对浮游植物群落结构的影响,2013年秋天在楚科奇陆架进行了欧拉定点观测(FPO)。从藻类色素特征推断出浮游植物群落的时间和垂直分布。在观测期内发生了强风事件(SWE),大对流将营养物质从底层输送到地面。在SWE之前,温暖,少盐和营养贫乏的地表水中的色素成分各不相同,叶绿素-a(chla)浓度低。 SWE诱导的垂直混合减弱了分层并带来了足够的养分以增强硅藻衍生的色素浓度(例如岩藻黄质和chlc3),表明硅藻的增加。我们还开发了一个模型,使用具有较高时空分辨率的剖面多波长荧光计(Multi-Exciter)来预测主要浮游植物色素/ chla比的分布。 Multi-Exciter还捕获了FPO站点和距FPO位置16公里的四个观察站点中环境变化引起的色素成分变化。此外,我们调查了主要co足类Calanus glacialis copepodid第五阶段放牧率的变化,以评估秋季开花期间一级和二级生产者之间的相互作用。硅藻生物量的增加导致微浮游植物的放牧率显着提高(> 20 Aμm),纳米浮游植物的放牧率降低(2-20 Aμm),这表明由于放牧导致的微浮游动物减少,强烈的级联效应。来自C. glacialis。我们得出的结论是,秋季的SWE可能通过浮游植物群落结构的季节性演替交替影响食物网。

著录项

  • 来源
    《Polar biology》 |2018年第6期|1279-1295|共17页
  • 作者单位

    Japan Agcy Maine Earth Sci & Technol, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

    Japan Agcy Maine Earth Sci & Technol, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

    Hokkaido Univ, Fac Fisheries Sci, 3-1-1 Minato Cho, Hakodate, Hokkaido 0468611, Japan;

    Japan Agcy Maine Earth Sci & Technol, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

    Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan;

    Hokkaido Univ, Fac Fisheries Sci, 3-1-1 Minato Cho, Hakodate, Hokkaido 0468611, Japan;

    Hokkaido Univ, Fac Environm Earth Sci, JST, CREST,Kita Ku, N10 W5, Sapporo, Hokkaido 0600810, Japan;

    Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan;

    Japan Agcy Maine Earth Sci & Technol, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fall bloom; Wind-induced mixing; Phytoplankton community structure; Zooplankton grazing;

    机译:秋季开花;风诱导混合;浮游植物群落结构;Zooplankton放牧;
  • 入库时间 2022-08-18 03:43:38

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号