Assessing the role of fish in kelp forests and rocky reefs. In dataMares: Ecological Monitoring

The sampling consisted of underwater visual censuses performed by scuba divers carrying out belt transects of 30 meters length (verified with tape measure) and a window of 2x2 meters of amplitude (30 × 2 m, assessment unit: 60 m2). For each locality, 6 transects were done. In the case of the kelp forest ecosystem, three transects were done in the benthic zone, and three in the midwater zone. The midwater position was weighted by the depth of the sampling site; 4-6 m from the bottom if the depth in the site is less than 10 m and 6-8 m if the depth is greater than 10 m. In the case of Rocky reef ecosystem all transects were done in the benthic zone. Transects were made trying to keep the same direction and speed, and changing direction between transects to avoid pseudoreplicate. To record the species and their sizes, acrylic boards and plastic paper (Duracopy) were used. All transects were performed between 08:00 a.m. to 2:00 p.m.

本次采样采用水肺潜水员开展的水下视觉普查法，使用经卷尺校准的30米长带样带（belt transects），样带观测幅宽为2米×2米，单个采样单元面积为60平方米（30×2 m）。每个采样点位共布设6条样带。针对海带林生态系统，其中3条样带布设至底栖带（benthic zone），剩余3条布设至中水带（midwater zone）；中水带的布设高度需依据采样点水深调整：若采样点水深小于10米，则中水带距水底4至6米；若水深大于10米，则距水底6至8米。针对岩礁生态系统，所有样带均布设至底栖带。布设样带时需尽量保持一致的行进方向与速度，且各条样带间需变换行进方向，以避免伪重复（pseudoreplication）。记录物种及其体型尺寸时，采用亚克力板与复写纸（Duracopy）作为记录工具。所有样带的布设作业均安排在每日上午8时至下午2时之间开展。