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首页> 外文学位 >Population connectivity in a dynamic coastal system: Effects of mesoscale eddies on distribution, growth, survival, and transport of larval reef fishes.
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Population connectivity in a dynamic coastal system: Effects of mesoscale eddies on distribution, growth, survival, and transport of larval reef fishes.

机译：动态沿海系统中的种群连通性：中尺度涡旋对幼体礁鱼分布，生长，存活和运输的影响。

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摘要

Population connectivity (i.e., the exchange of individuals among geographically distinct subpopulations) is an issue of particular relevance in the marine environment, as the majority of benthic marine organisms have complex life cycles and dispersal events occurring in the early life stages are nearly impossible to track. As the magnitude and direction of larval dispersal are shaped ultimately by larval distributions, growth, mortality, and transport to adult habitat, this dissertation examined these processes for larval reef fishes in the Straits of Florida (SOF) to contribute to the understanding of patterns of population connectivity along a continental coastline. An analysis of spatially and temporally extensive ichthyoplankton collections and associated environmental data demonstrated that environmental variation through the vertical water column was most important in structuring larval assemblages in the SOF and that horizontal patterns in larval assemblages were only weakly related to oceanographic features (i.e., mesoscale eddies, ME, and the Florida Current). However, otolith analysis revealed that residence in MEs enhanced larval growth for four out of the five reef fish species examined, and this increased growth was consistent across three sampling periods and two years. These results indicate that MEs provide enhanced feeding environments for larval reef fishes. Additional otolith analysis of cohorts of two reef fishes tracked from the pelagic environment to the reef (i.e., settlement-stage), demonstrated that for one species (Cryptotomus roseus) slow-growing larvae were selectively removed from the population just prior to settlement. In this same species, slow-growing larvae from offshore waters did not contribute to the surviving population of settlement-stage larvae, suggesting that for at least some species and settlement events, upstream Caribbean fish populations are not well-connected to populations in the SOF. Finally, several lines of evidence, including temporal changes in larval assemblages and patterns of larval abundance and age across water masses, are consistent with the existence of nearshore retention of locally-spawned larvae in the SOF and, thus, the potential for self-recruitment in reef fish populations of the Florida Keys.
机译：人口连通性（即，地理上不同的亚种群之间的个体交换）是海洋环境中特别重要的一个问题，因为大多数底栖海洋生物的生命周期复杂，几乎不可能追踪生命早期阶段发生的扩散事件。 。由于幼虫扩散的大小和方向最终取决于幼虫的分布，生长，死亡率以及向成年栖息地的运输，因此本文研究了佛罗里达海峡（SOF）幼体礁鱼的这些过程，以帮助了解其形态。大陆海岸线上的人口连通性。对空间和时间上广泛的鱼鳞浮游生物收集物和相关环境数据的分析表明，通过垂直水柱进行的环境变化对于构造SOF中的幼体集合最重要，而幼体集合中的水平模式与海洋特征（即中尺度）仅具有微弱的关系。涡流，ME和佛罗里达潮流）。但是，耳石分析表明，在被检测的五种珊瑚鱼中，有四种居住在微生态系统中可促进幼虫的生长，并且这种增长在三个采样周期和两年内是一致的。这些结果表明，微生态系统为幼体礁鱼提供了增强的摄食环境。对从远洋环境到珊瑚礁（即定居阶段）追踪的两种珊瑚鱼的队列进行的耳石分析也表明，对于一种物种（玫瑰金隐藻），在定居之前，有选择地从种群中移除了生长缓慢的幼体。在同一物种中，来自近海的缓慢生长的幼体对定居阶段幼体的存活种群没有贡献，这表明至少在某些物种和定居事件中，加勒比海上游鱼类种群与特种部队的种群没有很好的联系。最后，几条证据线，包括幼虫组合的时间变化，各水体的幼虫丰度和年龄的变化，与SOF中近岸产卵幼虫在近岸的存留相一致，因此具有自我招募的潜力在佛罗里达礁岛礁的鱼类种群中。

著录项

  • 作者

    Shulzitski, Kathryn.;

  • 作者单位

    University of Miami.;

  • 授予单位 University of Miami.;
  • 学科 Biology Conservation.;Biology Oceanography.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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