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首页> 外文期刊>Ocean & coastal management >Validation of a fish larvae dispersal model with otolith data in the Western Indian Ocean and implications for marine spatial planning in data-poor regions
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Validation of a fish larvae dispersal model with otolith data in the Western Indian Ocean and implications for marine spatial planning in data-poor regions

机译：用印度洋西部的耳石数据验证鱼幼虫扩散模型及其对数据贫乏地区海洋空间规划的意义

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The pelagic larval period is probably the least understood life stage of reef fish, yet the processes of larval dispersal and settlement exert a strong influence on the persistence of reef fish populations. A thorough understanding of these processes is essential to determining whether distant populations are connected and how to adapt management plans to patterns in connectivity. Managers may erroneously assume that local populations are isolated when they are actually replenished by distant reefs beyond their jurisdiction. Researchers increasingly rely on numerical hydrodynamic models that simulate the spatio-temporal dispersal of larvae by ocean currents to elucidate these connections and guide marine spatial planners, yet relatively little work has been done to validate these models with empirical data. In this study, we tested a dispersal simulation model against in situ observations of young post-larval fish to investigate a whether larvae settling at La Reunion (in the western Indian Ocean) might have originated at Mauritius, 200 km distant. First, we collected post larval specimens of honeycomb grouper (Epi-nephelus merra) shortly after an episodic mass settlement that occurred in 2002 at La Reunion. Using sclerochronology, we established the age of the fish from their otoliths. Finally, we simulated dispersal of larvae from La Reunion, Mauritius, and other reefs in the region by ocean currents using a 2D Eulerian advection-diffusion model driven by current velocities derived from satellite remote sensing. The simulation suggested that larvae spawned at La Reunion were carried away from the island while larvae spawned at Mauritius were carried to La Reunion. The otolith-derived ages of the fish were compatible with this hypothesis, when we accounted for the time required for larvae to drift from Mauritius to La Reunion. The combined results suggest a dispersal connection from Mauritius to La Reunion. To best maintain populations of adult reef fish at La Reunion, managers should protect stocks spawning at Mauritius. Although more study is needed to characterize patterns of regional connectivity and account for seasonal and inter-annual variations in these patterns, the example presented here demonstrates the possibility of distant connections in the western Indian Ocean. We urge managers in the region to look beyond their own jurisdictions, view their jurisdictions as part of a connected network, and undertake a collaborative approach to protecting the network as a whole.
机译：上层幼体时期可能是人们对珊瑚鱼生命的最不了解的时期，然而，幼体的扩散和沉降过程对珊瑚鱼种群的持久性具有重要影响。对这些过程的透彻了解对于确定远距离人口是否连通以及如何使管理计划适应连通性模式至关重要。管理人员可能会错误地认为，当地居民实际上是由其管辖范围以外的远方珊瑚礁补充的，因此他们是孤立的。研究人员越来越依赖于数值流体力学模型来模拟洋流对幼虫的时空扩散，以阐明这些联系并指导海洋空间规划者，但是用经验数据验证这些模型的工作却很少。在这项研究中，我们针对幼虫后幼鱼的原位观察测试了一个弥散模拟模型，以调查在拉留尼汪岛（印度洋西部）定居的幼虫是否可能起源于距离200公里的毛里求斯。首先，我们在2002年在留尼汪岛发生了大规模的大规模定居后不久，收集了蜂窝石斑鱼（Epi-nephelus merra）的幼虫后标本。使用年代记述法，我们从鱼的耳石中确定了鱼的年龄。最后，我们使用由卫星遥感推导的当前速度驱动的二维欧拉对流扩散模型，通过洋流模拟了拉留尼汪岛，毛里求斯和该地区其他珊瑚礁的幼虫扩散。模拟表明，拉留尼汪岛产卵的幼虫被带离了该岛，而毛里求斯的产卵被带到了留尼汪岛。当我们考虑幼虫从毛里求斯漂流到留尼汪岛所需的时间时，鱼的耳石来源年龄与该假设是一致的。综合结果表明，从毛里求斯到留尼汪岛的分散联系。为了最好地保持留尼汪岛成年礁鱼的种群，管理人员应保护在毛里求斯产卵的种群。尽管需要更多的研究来表征区域连通性的模式并解释这些模式中的季节性和年际变化，但此处提供的示例证明了印度洋西部遥远的联系的可能性。我们敦促该地区的管理人员超越自己的管辖范围，将其管辖范围视为连接的网络的一部分，并采取协作方法来保护整个网络。

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  • 来源
    《Ocean & coastal management》 |2013年第12期|13-21|共9页
  • 作者

    Estelle Crochelet; Pascale Chabanet; Karine Pothin; Erwann Lagabrielle; Jason Roberts; Gwenaeelle Pennober; Raymonde Lecomte-Finiger; Michel Petit;

  • 作者单位

    IRD/CoReUs (UR 227), Pare Technologique Universitaire, 2 rue Joseph Wetzell, CS 41 095, 97495 Sainte Clotilde Cedex, Reunion,IRD/ESPACE-DEV (UMR 228), Pare Technologique Universitaire, 2 rue Joseph Wetzell, CS 41 095, 97495 Sainte Clotilde Cedex, Reunion;

    IRD/CoReUs (UR 227), Pare Technologique Universitaire, 2 rue Joseph Wetzell, CS 41 095, 97495 Sainte Clotilde Cedex, Reunion;

    Reserve Naturelle Marine de la Reunion, 39 rue du Logon, Lot. Dayot, 97434 La Saline les Bains, Reunion;

    Universite de La Reunion/ESPACE-DEV (UMR 228), 15 avenue Rene Cassin, BP 7151, 97715 Saint Denis MESSAC Cedex 9, Reunion,Nelson Mandela Metropolitan University, Botany Department, George, South Africa;

    Duke University, Marine Ceospatial Ecology Laboratory, Nicholas School of the Environment, Durham, NC 27708, USA;

    Universite de La Reunion/ESPACE-DEV (UMR 228), 15 avenue Rene Cassin, BP 7151, 97715 Saint Denis MESSAC Cedex 9, Reunion;

    CNRS, Laboratoire de Biologie et d'icologie Tropicale et Mediterrane'enne, UMR 5244 CNRS-EPHE-UPVD, 66860 Perpignan, France;

    IRD/France-Sud direction, 911 Avenue agropolis, 34394 Montpellier Cedex, France;

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