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首页> 外文期刊>Deep-Sea Research >Zooplankton size and distribution within mesoscale structures in the Mozambique Channel: A comparative approach using the TAPS acoustic profiler, a multiple net sampler and ZooScan image analysis
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Zooplankton size and distribution within mesoscale structures in the Mozambique Channel: A comparative approach using the TAPS acoustic profiler, a multiple net sampler and ZooScan image analysis

机译:莫桑比克海峡中尺度结构内浮游动物的大小和分布:使用TAPS声廓线仪,多网采样器和ZooScan图像分析的比较方法

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摘要

Two surveys were conducted in the Mozambique Channel in November 2009 and April/May 2010 to study the influence of mesoscale eddies on the zooplanktonic component of the ecosystem. Three complementary methods were used to sample zooplankton: (1) hydro-acoustics with a TAPS™ multi-frequency zooplankton profiler; (2) in situ biological sampling using a Multinet with samples processed via the classical settled biovolume technique; (3) ZooScan image analysis which determines biovolume, size and taxonomic composition. This approach presented an ideal opportunity to compare the results of these different methods which highlighted a large overlap in their detectable size range. Each method favoured a particular size fraction of the population, i.e. TAPS for the microzooplankton (< 0.1 mm ESR) and the Multinet and ZooScan for larger sizes ( > 3 mm ESR). In the case of the 2009 cruise, a well-established cyclone-anticyclone dipole was sampled, with results clearly indicating a higher concentration of zooplankton in the cyclonic eddy compared to the anticyclonic counterpart. The TAPS also detected high surface (0-22 m) concentrations of what appeared to be microzooplankton or marine snow in the cyclone. In 2010, the eddy field was less defined and more spatially variable compared to that in 2009. Two cyclonic and anticyclonic features were sampled during the cruise, each with different life histories and levels of stability. Results were inconsistent compared to those of 2009 and dependent on the size component of the population, with both cyclonic and anticyclonic features capable of having higher planktonic biomass. Differences in species composition between these mesoscale features were not too different and mainly a matter of relative biovolume. Less well formed eddy fields, particularly in the mid-Mozambique Channel, therefore appear to result in indistinct vertical and horizontal zooplankton distribution patterns.
机译:2009年11月和2010年4月/ 5日在莫桑比克海峡进行了两次调查,以研究中尺度涡旋对生态系统浮游动物组成部分的影响。三种互补方法用于浮游动物采样:(1)使用TAPS™多频浮游动物剖面仪的水声; (2)使用Multinet进行原位生物采样,并通过经典沉降生物量技术处理样品; (3)ZooScan图像分析,可确定生物量,大小和生物分类组成。这种方法为比较这些不同方法的结果提供了理想的机会,这些方法突出了它们可检测的大小范围内的巨大重叠。每种方法都适合人口的特定大小部分,即用于微浮游动物的TAPS(ESR小于0.1毫米),对于较大的动物来说Multinet和ZooScan的ESR大于3毫米。在2009年的航行中,采样了一个完善的气旋-反气旋偶极子,结果清楚地表明,与反气旋涡旋相比,旋风涡旋中浮游动物的浓度更高。 TAPS还检测到高表面(0-22 m)浓度的旋风中似乎是微浮游生物或海洋积雪。与2009年相比,2010年的涡流区域定义较少,空间变化更大。在航行期间采样了两个气旋和反气旋特征,每个特征都有不同的生活历史和稳定性水平。与2009年相比,结果不一致,并且取决于人口的规模组成,气旋和反气旋特征均具有较高的浮游生物量。这些中尺度特征之间的物种组成差异并没有太大差异,主要是相对生物量问题。因此,涡旋场形成的欠佳,特别是在莫桑比克中部海峡,似乎导致垂直和水平的浮游动物分布模式不清楚。

著录项

  • 来源
    《Deep-Sea Research》 |2014年第2期|136-152|共17页
  • 作者单位

    Institut de Recherche pour le Developpement (IRD), UMR LEMAR 195 (UBO/CNRS/IRD/Ifremer), Campus Ifremer, BP 70, 29280 Plouzane, France;

    Oceans and Coastal Research, Department of Environmental Affairs, Private Bag X2, Roggebaai 8012, Cape Town, South Africa ,Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;

    Cape Peninsula University of Technology, PO Box 652, Cape Town 8000, South Africa;

    Institut de Recherche pour le Developpement (IRD), UMR LEMAR 195 (UBO/CNRS/IRD/Ifremer), Campus Ifremer, BP 70, 29280 Plouzane, France;

    Institut de Recherche pour le Developpement (IRD), UMR LEMAR 195 (UBO/CNRS/IRD/Ifremer), Campus Ifremer, BP 70, 29280 Plouzane, France;

    Oceans and Coastal Research, Department of Environmental Affairs, Private Bag X2, Roggebaai 8012, Cape Town, South Africa ,Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;

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

    Mozambique Channel; Zooplankton; TAPS; Acoustics; Multinet; ZooScan; Eddies;

    机译:莫桑比克海峡;浮游动物;胶带;声学;多网ZooScan;涡流;

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