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Larval dispersal and vertical migration behaviour - a simulation study for short dispersal times

机译：幼虫的扩散和垂直迁移行为-短扩散时间的模拟研究

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摘要

Current speed often varies with depth, so vertical movements of larvae are expected to have profound effects on dispersal velocity and therefore dispersal potential. Systematic behaviours are expected to have strong effects on dispersal. However, reliable information on the presence of vertical migrations in larvae is scarce, but the few well investigated empirical examples justify a detailed simulation study and an analysis of potential effects. We present a spatially explicit 3D hydrodynamic model that incorporates biological information in the form of active particles adverted in a Lagrangian fashion. The set-up is designed to analyze the sensitivity of dispersal distances to variation in vertical behaviour of larvae. We simulated short (4 days) pelagic larval durations (PLDs) to determine whether behaviour might be important over short dispersal periods. We found that sinusoidal behaviours (slow vertical migration) in or out of phase with tides did not significantly change the dispersal patterns compared to those of larvae that remained at the surface. By contrast, a quadratic pattern of behaviour resulting in rapid vertical migration, in or out of phase with tides, had dramatic effects on both distance and direction of dispersal. The resulting dispersal kernels were found to be multimodal due to the interaction between tidal and meteorological components in flow. Incorporating biological information on larval migrations in Lagrangian simulation of dispersal will be important in estimates of connectivity and forecasting marine reserve networks.
机译：目前的速度通常随深度而变化，因此幼虫的垂直运动预计会对扩散速度产生深远的影响，从而对扩散潜能产生深远的影响。预期系统行为会对分散产生重大影响。然而，关于幼虫中垂直迁移的可靠信息很少，但是很少有人经过充分研究的经验例子证明了详细的模拟研究和对潜在影响的分析是正确的。我们提出了一个空间明确的3D水动力模型，该模型以以拉格朗日方式广告的活性颗粒形式结合了生物信息。该设置旨在分析散布距离对幼虫垂直行为变化的敏感性。我们模拟了短时间（4天）的上层幼体持续时间（PLD），以确定行为在短时间的传播期间是否可能很重要。我们发现，与潮汐留在表面的幼虫相比，与潮汐同相或异相的正弦行为（缓慢的垂直迁移）不会显着改变散布模式。相比之下，导致潮汐垂直或垂直异相的行为的二次方型，对扩散的距离和方向都产生了显着影响。由于潮流中的潮气和气象成分之间的相互作用，发现所形成的分散核是多峰的。在拉格朗日的扩散模拟中纳入有关幼虫迁移的生物信息对于估计连通性和预测海洋保护区网络将非常重要。

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  • 来源
    《Marine ecology》 |2012年第2期|p.183-193|共11页
  • 作者

    Andreas Sundeloef; Per R. Jonsson;

  • 作者单位

    Department of Marine Ecology, University of Gothenburg, PO Box 461, SE 40530 Goteborg, Sweden Swedish University of Agricultural Sciences, Department of Aquatic Resources, Institute of Marine Research, Box 4, 453 21 Lysekil,Sweden Department of Biology,University of Bergen, PO Box 7800, N-5020 Bergen, Norway;

    Department of Marine Ecology, Tjaernoe Marine Biological Laboratory, Stroernstad, Sweden;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    behavior; circatidal; hydrodynamic modelling; lagrangian; larval dispersal;

    机译：行为;绕生;流体动力学建模;拉格朗日幼虫扩散;

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