We examined the abundance and horizontal and vertical distributions of epipelagic ctenophores and scyphomedusae in the northern Bering Sea using an underwater video camera during July of 2017 and 2018. The effects of environmental and biological parameters on the distribution of these species were evaluated by generalized additive modelling (GAM). In 2017, the dominant ctenophore, Bolinopsis infundibulum, was mainly distributed in the north and west of St. Lawrence Island (SLI), and their vertical distribution varied with the region but not by the time of day. We found that B. infundibulum was distributed in the upper pycnocline north of SLI, but below the pycnocline west of SLI. Biological interactions with other gelatinous zooplankton may explain these regional differences in vertical distribution; GAM analysis revealed a negative interaction between B. infundibulum and the large scyphomedusa, Chrysaora melanaster, which occurred in the upper layer in the west of SLI. B. infundibulum may avoid that layer to reduce feeding competition. For the ctenophore, Beroe sp., vertical and horizontal distributions were similar to those of B. infundibulum, and GAM analysis also revealed a positive interaction for both species. As B. infundibulum is an important prey of Beroe sp., a prey-predator interaction may result from their similar horizontal and vertical distributions. Standing stocks of epipelagic ctenophores and scyphomedusae in 2018 were low compared to those in 2017, by a factor of 1/20 (C. melanaster) and1/90 (Beroe sp.). This might be due to annual differences in water mass in this region, in that the thermal conditions characterized by a high abundance of the dominant B. infundibulum in 2017 (<2 and >8 °C) were absent in 2018. As this drastic decrease in standing stock in 2018 was apparent for both ctenophores and scyphomedusae, food availability was hypothesized to be poor that year.

我们在2017年7月和2018年期间使用水下摄像机研究了白令海北部表层上的十足动物和甲状尾藻的丰度以及水平和垂直分布。通过广义加性模型评估了环境和生物学参数对这些物种分布的影响（GAM）。2017年，主要的dominant虫Bolinopsis infundibulum主要分布在圣劳伦斯岛（SLI）的北部和西部，它们的垂直分布随区域而变化，但在一天中没有变化。我们发现漏斗芽孢杆菌分布在SLI以北的上部比诺西林，但在SLI以西的比诺西林以下。与其他胶状浮游生物的生物相互作用可能解释了垂直分布中的这些区域差异。GAM分析显示，漏斗芽孢杆菌与大型鳞茎水母Chrysaora melanaster之间存在负向相互作用，发生在SLI西部的上层。B.漏斗fund可以避免该层，以减少饲养竞争。对于the虫，Beroe sp。的垂直和水平分布与漏斗双歧杆菌相似，并且GAM分析还揭示了两个物种的正向相互作用。由于漏斗芽孢杆菌是Beroe sp。，猎物与食肉动物的相互作用可能是由于它们相似的水平和垂直分布而引起的。与2017年相比，2018年表皮上的十足动物和鞘甲水母的常备存量较低，分别为1/20（C. melanaster）和1/90（Beroe sp。）。这可能是由于该地区水量的年度差异所致，因为在2018年不存在以2017年主要的漏斗芽孢杆菌（<2和> 8°C）高丰度为特征的热条件。十足动物和水生夜蛾都有明显的2018年常备存货，据推测那年的食物供应较差。