In Situ Benthic Image Transects from the Disko Fan Conservation Area in the Davis Strait (Eastern Arctic)

In 2012 and 2013, Fisheries and Oceans Canada conducted benthic imagery surveys in the Davis Strait and Baffin Basin in two areas then closed to bottom fishing, the Hatton Basin Voluntary Closure (now the Hatton Basin Conservation Area) and the Narwhal Closure (now partially in the Disko Fan Conservation Area). The photo transects were established as long-term biodiversity monitoring sites to monitor the impact of human activity, including climate change, on the region’s benthic marine biota in accordance with the protocols of the Circumpolar Biodiversity Monitoring Program (CBMP) established by the Council of Arctic Flora and Fauna. These images were presented in a technical report that summarises the epibenthic megafauna found in seven image transects from the Disko Fan Conservation Area: Baker, E., Beazley, L., McMillan, A., Rowsell, J. and Kenchington, E. 2018. Epibenthic Megafauna of the Disko Fan Conservation Area in the Davis Strait (Eastern Arctic) Identified from In Situ Benthic Image Transects. Can. Tech. Rep. Fish. Aquat. Sci. 3272: vi + 388 p. Taxa from ten phyla (Annelida, Arthropoda, Brachiopoda, Bryozoa, Chordata, Cnidaria, Echinodermata, Mollusca, Nemertea, Porifera) were identified from the imagery and reported on a per photo basis in v.4. That data was analyzed to comply with CBMP recommendations. The average abundance (N), number of taxa (S), Margalef d, Shannon Diversity and Simpson’s Index with their Hill equivalents, and Pielou’s Evenness, were calculated for each transect. Bray-Curtis similarity in community composition among transects was calculated from log(x+1)-transformed standardized abundance. UPGMA cluster analysis identified three significantly different depth-related clades. S, N and d were significantly negatively correlated with depth. That work is summarized in: Kenchington, E., Lirette, C., Treble, M., and Jacobs, K. 2022. Biodiversity Monitoring Stations for Benthic Megafauna in the Disko Fan Conservation Area. Can. Tech. Rep. Fish. Aquat. Sci. 3499: v + 75 p. In this v.4 update the abundance of taxa in each photo are provided. Those data can be used to calculate the indices summarized in the 2022 report.2012年至2013年，加拿大渔业与海洋部（Fisheries and Oceans Canada）在戴维斯海峡（Davis Strait）与巴芬海盆（Baffin Basin）两处此前禁止底拖捕捞的海域开展底栖影像调查，覆盖区域为哈特顿海盆自愿禁渔区（现为哈特顿海盆养护区（Hatton Basin Conservation Area））与独角鲸禁渔区（现为迪斯克扇养护区（Disko Fan Conservation Area）的一部分）。 该摄影样带被设立为长期生物多样性监测站点，旨在依照北极动植物理事会（Council of Arctic Flora and Fauna）设立的环极生物多样性监测计划（Circumpolar Biodiversity Monitoring Program, CBMP）的规程，监测包括气候变化在内的人类活动对该区域底栖海洋生物群落的影响。 这批影像收录于一份技术报告，该报告汇总了迪斯克扇养护区7条影像样带的表栖大型底栖生物（epibenthic megafauna）记录： Baker, E., Beazley, L., McMillan, A., Rowsell, J. 及 Kenchington, E. 2018. 《戴维斯海峡（东北极）迪斯克扇养护区表栖大型底栖生物：基于原位底栖影像样带的鉴定结果》. Can. Tech. Rep. Fish. Aquat. Sci. 3272: vi + 388 p. 研究从影像中鉴定出10个门类的分类单元：环节动物门（Annelida）、节肢动物门（Arthropoda）、腕足动物门（Brachiopoda）、苔藓动物门（Bryozoa）、脊索动物门（Chordata）、刺胞动物门（Cnidaria）、棘皮动物门（Echinodermata）、软体动物门（Mollusca）、纽形动物门（Nemertea）、多孔动物门（Porifera），并在第4版中以单张照片为单位进行了记录。该数据集依照环极生物多样性监测计划的建议完成分析处理。 针对每条样带，研究人员计算了平均丰度（N）、类群数（S）、Margalef丰富度指数d、香农多样性指数（Shannon Diversity）、辛普森多样性指数（Simpson’s Index）及其希尔等效值（Hill equivalents），以及皮卢均匀度指数（Pielou’s Evenness）。基于经log(x+1)转换的标准化丰度数据，计算得到样带间群落组成的Bray-Curtis相似性。通过UPGMA聚类分析，识别出3个与深度显著相关的不同演化支。类群数（S）、丰度（N）及丰富度指数d与水深呈显著负相关。上述研究成果汇总于： Kenchington, E., Lirette, C., Treble, M. 及 Jacobs, K. 2022. 《迪斯克扇养护区大型底栖生物多样性监测站点》. Can. Tech. Rep. Fish. Aquat. Sci. 3499: v + 75 p. 本第4版更新提供了每张照片中各分类单元的丰度数据，可用于计算2022年报告中汇总的各类生物多样性指数。