Video transect monitoring data from Heron Island, southern Great Barrier Reef

Coral cover was estimated from fixed transects at five sites on the inner reef flat (A1, B1, C1, D1 and N1), five sites on the outer reef flat (A2, B2, C2, D2 and N2) and four sites on the lower reef slope (H1, H2, H3 and H4) at Heron Island in the southern Great Barrier Reef.Surveys of the inner and outer reef flat were conducted at previously established monitoring sites. Transects were 30m long on the inner reef flat and 20m long on the outer reef flat. New sites were established on the lower reef slope at depths of 6-9m and transect lengths of 50 m were used. The number of transects per site was six on the inner reef flat, three on the outer reef flat and five on the lower reef slope. Video footage taken of each transect using standard methods was analysed by staff at the Australian Institute of Marine Science, using a point-sampling method to estimate coral cover.Surveys were conducted in October 1993 (pre-bund wall), November 1994, 1995, 1996 and December 1997 for all sites, with an additional pre-bund wall sampling event at sites H1, H2 and H3 in February 1993.Surveys were conducted to monitor the response of coral communities to the hydrodynamic and water level changes resulting from redevelopment of the bund wall at Heron Island, which took place between October 1993 and April 1994.This study was part of a longterm video-monitoring program undertaken jointly by the Queensland Department of Environment and the Great Barrier Reef Marine Park Authority. Video analysis was done under contract by the Australian Institute of Marine Science.Berkelmans, R, Oliver J, Byron G and Olds J (1997) Impact assessment of the Heron Island bund wall on coral communities. Reef Research 7(1): 6-9.Berkelmans, R, Oliver J, Byron G and Olds J (1998) Heron Island: The history of the bund wall and an impact assessment of its 1993 redevelopment on nearby coral communities. In: Greenwood JG and Hall NJ (eds) Proceedings of the Australian Coral Reef Society 75th Anniversary Conference, Heron Island, October 1997. School of Marine Science, The University of Queensland, Brisbane.本研究通过固定样带（fixed transects）对大堡礁南部赫伦岛（Heron Island）的珊瑚覆盖度进行估算，采样布局如下：内礁坪设置5个监测点位（A1、B1、C1、D1与N1），外礁坪设置5个监测点位（A2、B2、C2、D2与N2），礁坡下部设置4个监测点位（H1、H2、H3与H4）。 内、外礁坪的调查依托预先设立的长期监测点位开展。内礁坪样带长度为30米，外礁坪样带长度为20米；礁坡下部为新增设的监测点位，布设水深范围为6~9米，样带长度统一为50米。各点位的样带数量分别为：内礁坪6条、外礁坪3条、礁坡下部5条。 本研究采用标准方法拍摄各条样带的视频影像，随后由澳大利亚海洋科学研究所（Australian Institute of Marine Science）的科研人员采用点采样法（point-sampling method）对影像进行分析，以估算珊瑚覆盖度。 本次调查的时间覆盖以下时段：1993年10月（防波堤（bund wall）重建前）、1994年11月、1995年、1996年及1997年12月，所有点位均参与了上述时段的调查；此外，针对H1、H2与H3三个点位，还于1993年2月增设了一次防波堤重建前的采样工作。 本次调查旨在监测赫伦岛防波堤重建工程（1993年10月至1994年4月实施）引发的水动力与水位变化对珊瑚群落的影响。 本研究是昆士兰州环境部（Queensland Department of Environment）与大堡礁海洋公园管理局（Great Barrier Reef Marine Park Authority）联合开展的长期视频监测计划的一部分，视频分析工作由澳大利亚海洋科学研究所承接完成。 Berkelmans R、Oliver J、Byron G 与 Olds J（1997）《赫伦岛防波堤对珊瑚群落的影响评估》，《礁体研究》（Reef Research）7(1): 6-9。 Berkelmans R、Oliver J、Byron G 与 Olds J（1998）《赫伦岛：防波堤历史及其1993年重建工程对周边珊瑚群落的影响评估》，收录于Greenwood JG与Hall NJ主编《澳大利亚珊瑚礁学会第75届年会论文集》，1997年10月，赫伦岛，昆士兰大学海洋科学学院，布里斯班。