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首页> 外文学位 >A modeling study of oyster larval transport in Mobile Bay and eastern Mississippi Sound, Alabama.
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A modeling study of oyster larval transport in Mobile Bay and eastern Mississippi Sound, Alabama.

机译：莫比尔湾和阿拉巴马州密西西比湾东部牡蛎幼体运输的模型研究。

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摘要

Oysters and oyster reefs are very important components of estuarine and coastal ecosystems and economies. Among various factors affecting recruitment of oysters, larval transport may produce spatial and temporal patterns of abundance that are important determinants of management strategies. This study involving both field and modeling components investigated the characteristics of larval transport of eastern oyster, Crassostrea virginica, in Mobile Bay and eastern Mississippi Sound, Alabama.;A three-dimensional larval transport model accounting for physical transport, biological movement of larvae, and site- and larvae-specific conditions was developed for eastern oyster. The model reasonably reproduced the observed gradient decreasing from west to east in oyster spat settlement and bivalve larval concentration at time scales of overall average, season, and each survey.;Local-recruitment of larvae released at Cedar Point Reef, which contributes over 90% of oyster harvest in Alabama, is likely responsible for the persistent gradient decreasing from west to east in oyster spat settlement over the past 40 years. Efficient flushing through Main Pass prevents larval exchange between the west and east side of the Bay, resulting in negligible connectivity between the two basins separated by about 30 km. Seasonal and spatial variations in oyster spat settlement are explained in terms of variations in larval supply in response to seasonal wind and river discharge. Flooding events, which occur at any time during the oyster larval recruitment period, reduces larval retention substantially in CP and EMS. Retention of early-stage larvae mostly determined by physical transport plays a critical role in overall transport and retention of larvae in the Mobile Bay system. Net sinking of late-stage larvae shortens downstream dispersal range of larvae and increases larval retention near spawning area, thus providing a favorable condition for local-recruitment of oysters. However, biological movement of oyster larvae does not change overall patterns of larval transport by physical transport only.;This study have enhanced our understanding of the controlling processes for larval transport and retention and provided fundamental knowledge for restoration and management of oyster population.
机译：牡蛎和牡蛎礁是河口和沿海生态系统和经济的重要组成部分。在影响牡蛎招募的各种因素中，幼体的运输可能产生丰富的时空格局，这是管理策略的重要决定因素。这项涉及现场和建模要素的研究调查了东部牡蛎（Crassostrea virginica）在阿拉巴马州莫比尔湾和密西西比湾东部的幼虫运输特征;三维幼虫运输模型，说明了物理运输，幼虫的生物运动和为东部牡蛎开发了特定于地点和幼虫的条件。该模型合理地再现了在总体平均水平，季节和每次调查的时间尺度上牡蛎卵沉降和双壳类幼虫浓度从西向东递减的观测梯度；在雪松点礁释放的幼体在当地招募，占90％以上阿拉巴马州牡蛎收获量的增加，可能是过去40年牡蛎角沉积物中从西向东持续下降的原因。通过主通道的有效冲洗防止了海湾西侧和东侧之间的幼体交换，从而导致相隔约30公里的两个盆地之间的连通性微不足道。牡蛎卵沉降的季节性和空间变化是根据季节性风和河水排放的幼体供应变化来解释的。在牡蛎幼体募集期间的任何时间发生的洪水事件，大大减少了CP和EMS中的幼体滞留。早期幼虫的保留主要由物理运输决定，在Mobile Bay系统中幼虫的整体运输和保留中起着至关重要的作用。后期幼体的净沉降缩短了幼体的下游扩散范围，并增加了产卵区附近的幼体保留，从而为牡蛎的局部招募提供了有利条件。然而，牡蛎幼体的生物运动并不能仅仅通过物理运输来改变幼体运输的整体模式。这项研究增进了我们对幼虫运输和保留控制过程的理解，并为恢复和管理牡蛎种群提供了基础知识。

著录项

  • 作者

    Kim, Choong-Ki.;

  • 作者单位

    University of South Alabama.;

  • 授予单位 University of South Alabama.;
  • 学科 Physical Oceanography.;Biology Oceanography.;Agriculture Fisheries and Aquaculture.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;水产、渔业;海洋生物;
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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