Long-term and high-resolution time series datasets of vent species abundance from the Grotto hydrothermal edifice (Main Endeavour Field, Juan de Fuca Ridge)

focused on vent ecology, the tempo-mini ecological observatory module is deployed on the active grotto hydrothermal edifice (main endeavour field, juan de fuca ridge), selected as a target site for the deep-sea cabled observatory ocean networks canada. to study long-term temporal dynamics of vent communities, the camera was programmed to record 20-min video sequences six times a day (02.00, 06.00, 10.00, 14.00, 18.00 and 22.00 utc) with three zoom levels per sequence corresponding to ‘large’, ‘medium’ and ‘fine’ views. the camera was focused on a ridgeia piscesae tubeworm assemblage harbouring a dense community of associated fauna. temporal variation in the observed abundances of four visible taxa (ammotheidae pycnogonids, polynoidae polychaetes, buccinidae gastropods and zoarcidae eelpouts) was quantified using the large and medium views (see figure). to avoid ‘observer bias’ among consecutive measurements, video sequences were analysed in random order. the first observation strategy had a fixed daily observation time set at 10.00 utc encompassing two years from 20 june 2013 to 20 june 2015. the second observation strategy was designed to identify seasonal components of macrofaunal and environmental variability. all six observations (observation frequency of tempo-mini) were analysed during one summer (june 2014) and three winters (november 2014, december 2014 and january 2015) months. these specific time windows were selected to minimize the amount of missing data generated by temporary shortcomings of the observatory and to maximize the presence of high-quality video imagery. details on these observation methods and analyses conducted on a part of these datasets are published in lelièvre et al. 2017 (doi:10.1098/rspb.2016.2123).

专注于海底生态学，该 tempo-mini 生态观测模块被部署在活跃的洞穴型海底热液构造（主要研究区域，位于胡安·德富卡海脊），并被选定为加拿大海洋网络深海有线观测站的目标研究地点。为研究海底热液生态群落的长期时间动态，摄像机被编程以每日六次记录20分钟的视频序列（02:00、06:00、10:00、14:00、18:00和22:00 UTC），每个序列包含三个不同焦距的视角，分别对应‘大视场’、‘中视场’和‘细视场’。摄像机专注于一个宿主着丰富关联生物种群的 Ridgeia piscesae 管虫群落。利用大视场和中视场对四种可见类群（Ammotheidae 腔肠动物、Polynoidae 多毛类、Buccinidae 腹足类和 Zoarcidae 鲶形目鱼类）的丰度变化进行了量化分析（见图）。为了避免连续测量中的‘观察者偏差’，视频序列以随机顺序进行分析。首次观测策略设定了每日固定的观测时间，即10:00 UTC，持续两年，从2013年6月20日至2015年6月20日。第二次观测策略旨在识别大型无脊椎动物和环境变率的季节性成分。在2014年夏季（6月）和三个冬季（2014年11月、12月和2015年1月）的六次观测（tempo-mini 的观测频率）中进行了分析。这些特定的时间窗口被选定，旨在最小化观测站临时故障产生的缺失数据量，并最大化高质量视频图像的出现。关于这些观测方法和对这些数据集部分进行的分析详情，已发表在 Lelièvre 等人（2017）的研究论文中（DOI: 10.1098/rspb.2016.2123）。