Very Nearshore Oceanography and the Dispersal of Larval Invertebrates

这项研究验证了这样一种假设，即沿着岩石海岸线，近岸地形产生的次生环流影响沿海生物幼虫跨陆架的扩散。二次循环可以将小海湾内的水域与较近海的水域隔开，并防止幼虫扩散到沿海水域。或者，它可以防止在沿海水域发育的幼虫返回岸上的定居地点。将调查这些可能性，以及潜在的模式和机制。这项研究将是对这些假设的第一次检验。与地形产生的次级环流相关的物理海洋学和同步的幼虫分布将描述俄勒冈海岸沿线的地点。CTD横断面将从海滩延伸到二次环流锋面并向外延伸到沿海水域。浮游生物垂直横断面将与CTD采样同时进行，以描述浮游植物的分布。通过影响幼虫的扩散，这种小规模的环流可能会导致幼虫在岸上的定居和招募的变化。在夕阳湾，将在海湾入海口前方的系泊地点测量赛普拉斯和贻贝的数量和栖息地。随着动物在沉降板和刷子上的堆积，将监测沉降。

This study tests the hypothesis that along a rocky coastline nearshore topographically generated secondary circulation affects the cross-shelf dispersal of the larvae of coastal organisms. Secondary circulation may isolate the waters within a small bay from the more offshore waters and my prevent larvae from dispersing out into the coastal waters. Alternatively, it could prevent larvae that have developed in the coastal waters from returning to settlement sites on the shore. These possibilities will be investigated, as well as the underlying patterns and mechanisms. This study would be the first test of these hypotheses.Physical oceanography and concurrent larval distributions associated with topographically generated secondary circulation will be described at sites along the Oregon coast. CTD transects will be taken extending from the beach through the secondary circulation front and out into the coastal waters. Transects of vertical plankton tows will be made concurrently with the CTD sampling to describe the distribution of meroplankton. By affecting larval dispersal, this small-scale circulation could bring about variations in the settlement and recruitment of larvae to the shore. At Sunset Bay, abundance and settlement of cyprids and mussels will be measured at mooring sites across the front at the mouth of the bay. Following the accumulation of animals on settlement plates and brushes will monitor settlement.