We evaluated spatial, short-term, and decadal-scale variability in the summer ichthyoplankton assemblages within the North Inlet-Winyah Bay estuarine system, Georgetown County, South Carolina, USA. Ichthyoplankton were collected weekly from late May to early September 2016 on nighttime flood tides using a 1-m diameter, 1-mm mesh plankton net at three sites of varying salinity and proximity to inlets. Nearly 30,000 fishes representing 59 taxa were collected from all three sites over the 14-week study period. Gobiidae and Anchoa spp. dominated the overall community, composing between 69 and 94% of the total catch at each of the three sites. Weekly densities of all taxa combined did not vary between sites, yet diversity metrics (richness, evenness, Shannon-Weiner index, and Simpson’s index) were greatest at the highest salinity site, and overall assemblage composition significantly varied among sites. Non-metric multidimensional scaling suggested a shift in the assemblage at all sites corresponding to an increase in water temperature throughout the summer. Differences in family-level assemblage composition between this study and previous work from the 1980s were detected, differences which may be indicative of regional-scale environmental change. Overall, the summer ichthyoplankton assemblages resembled those from other estuaries along the southeastern US Atlantic coast and temperate regions worldwide, generally dominated by a few taxa and composed of a mixture of estuarine-, estuarine and nearshore-, and continental shelf-spawning taxa.

我们评估了美国南卡罗来纳州乔治敦县北入口-威雅湾河口系统内夏季鱼鳞浮游动物组合的空间，短期和年代际尺度的变化。从2016年5月下旬至2016年9月上旬，在夜间洪水潮汐中每周使用1米直径，1毫米网眼的浮游生物网在三个盐度不同且靠近进水口的地点收集浮游鱼类。在为期14周的研究期内，从这三个地点收集了近30,000条代表59个分类单元的鱼类。戈壁科和An鱼spp。在整个社区中占主导地位，在这三个地点中，每个地点占总捕捞量的69％至94％。所有盐类的周密度在不同地点之间没有变化，但多样性指标（丰富度，均匀度，Shannon-Weiner指数和Simpson指数）在最高盐度的地点最大，并且整个组合的组成在各个地点之间也存在很大差异。非度量多维标度表明，所有位置的组合都发生了变化，与整个夏季的水温升高相对应。发现这项研究与1980年代以前的工作之间在家庭层面的组合组成上存在差异，这些差异可能表明区域规模的环境变化。总体，