Vertical migrations of reef fish larvae in the Straits of Florida and effects on larval transport
Vertical migrations of reef fish larvae in the Straits of Florida and effects on larval transport
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佛罗里达海峡礁鱼幼体的垂直洄游及其对幼体运输的影响
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Sponaugle
中科院分区：
文献类型：
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作者：
K. Huebert;R. Cowen;S. Sponaugle
本研究的目的是测量佛罗里达海峡中上层珊瑚鱼幼虫的垂直分布，识别显著的垂直迁移，并估计不同环境流深度之间的垂直迁移对幼虫运输的影响。在迈阿密近海的佛罗里达洋流边缘进行了春季、夏季和秋季的浮游生物网拖网序列研究。在每个时间序列中，固定站水柱上100米的水柱每隔3小时重复采样两次，在五个离散的深度范围内使用不同的网采样。同时，船上的电流剖面仪记录了深度电流。通过非参数重采样和树回归技术确定了幼虫深度和具有统计学意义的垂直迁移的均值和标准差。在10个分类群中，幼虫表现出个体性垂直迁移，并随着生长发育逐渐向纵深迁移。6个分类群的垂直分布昼夜变化，显示出昼夜垂直迁移。根据目前的测量结果和幼虫的垂直分布，通过生成递进矢量图来估计幼虫的迁移。佛罗里达洋流的主要沿岸成分导致幼虫通过佛罗里达海峡的快速运输，而跨岸洋流则弱一个数量级且高度可变。70 m深度的幼虫迁移量减少了15-75%；因此，深垂直分布和向下垂直迁移可能有利于佛罗里达海峡的保留和定居。
The goals of this study were to measure vertical distributions of pelagic coral reef fish larvae, identify significant vertical migrations, and estimate the effects of vertical migrations between depths with different ambient currents on larval transport in the Straits of Florida. Spring, summer, and fall time‐series of plankton net tows were conducted at the edge of the Florida Current offshore of Miami. In each time‐series the upper 100 m of the water column at a fixed station was sampled repeatedly at 3‐h intervals for two diel cycles, with different nets sampling at five discrete depth ranges. Simultaneously, currents‐at‐depth were recorded by shipboard current profilers. Mean and standard deviation of larval depth and statistically significant vertical migrations were determined by nonparametric resampling and tree regression techniques. In 10 taxa, larvae showed ontogenic vertical migrations, gradually moving deeper with growth and development. Vertical distributions of six taxa varied between day and night, revealing diel vertical migrations. Larval transport was estimated by generating progressive vector diagrams from current measurements and larval vertical distributions. The dominant alongshore component of the Florida Current resulted in rapid larval transport through the Straits of Florida, while cross‐shore current was an order of magnitude weaker and highly variable. Larvae at depths > 70 m experienced a 15–75% reduction in transport; thus, deep vertical distributions and downward vertical migrations potentially favor retention and settlement in the Straits of Florida.