Gelatinous zooplankton are prominent fauna in the deep ocean, especially in the water column associated with the sea floor. This interface zone, the benthic boundary layer, is critical to biogeochemical exchanges between pelagic and benthic communities. A conspicuous member of this benthic boundary layer community in the abyssal Northeast Pacific (Sta. M; 4000 m depth) is the hydrozoan medusa, Benthocodon pedunculata. A 3-year time-series study was conducted of B. pedunculata from October 2014 to November 2017 using an autonomous time-lapse camera system and acoustic current meter deployed on the sea floor. Remotely operated vehicle benthic video transects and collections were also conducted during six servicing cruises for the long-term instruments. Over three years, a total of 123,887 B. pedunculata were recorded in hourly images with densities ranging from 0 to a high of 33 individuals m⁻³ in March 2016. Density of B. pedunculata was highest when current speeds were low, and declined precipitously as speed increased beyond ~1 cm s⁻¹. Movement of B. pedunculata was parallel to the continental margin in northwest and southeast directions. The large numbers of B. pedunculata observed over this 3-year study suggests their ecological importance in the benthic boundary layer food web at Sta. M.

胶质浮游动物是深海中的重要动物，特别是在与海床相关的水柱中。该界面区域，底栖边界层，对上层和底栖群落之间的生物地球化学交换至关重要。在深海东北太平洋（Sta。M；深度为4000 m）中，该底栖边界层群落的一个显着成员是水生动物美杜莎（Benthocodon pedunculata）。对B. pedunculata进行了为期3年的时间序列研究从2014年10月到2017年11月，使用自动延时摄影机系统和声波计部署在海底。在为长期仪器进行的六次维修航行中，还进行了遥控车辆底盘视频样带和采集。在过去的三年中，2016年3月，每小时图像中记录了总共123,887 pedunculata，密度从0到33个人m ^-3高。当当前速度低时，pedunculata的密度最高，并且急剧下降当速度增加超过〜1 cm s ^-1时。B. pedunculata的运动平行于西北和东南方向的大陆边缘。大量在这项为期三年的研究中观察到的B. pedunculata表明，它们在Sta的底栖边界层食物网中具有生态重要性。M.