Replication data for: 2007 intertidal biodiversity survey of Wizard Islet conducted by the Coastal Biodiversity and Conservation Class

In 1997 the Bamfield Marine Sciences Centre established a long-term monitoring project to collect baseline data on the distribution and abundance of macroorganisms at two intertidal sites on Wizard Islet in Barkley Sound. Both sites were resampled in 2001, and the exposed site was resampled in 2002 and 2003. In 2007, both sites were sampled again, and data is presented here for algal cover (%), sessile invertebrates cover (%) and invertebrates density. Wizard Islet (48°51’29.5”N, 125°09’31”W) is located within the Deer Group Islands in Barkley Sound and has an area of 1.73 hectares at low tide. The sheltered site (with less wave exposure) is located on a 50m stretch of fixed rocky shore on the northeast side and is characterized by Fucus and Phyllospadix (seagrass). The exposed site is located on a 50m stretch of fixed rocky shore on the southwest side and is characterized by Egregia (feather-boa kelp), goose-necked barnacles and Alaria (brown alga). Vertical transects were randomly selected; 17 on the sheltered site (tag numbers 5, 13, 20, 21, 26, 28, 31, 32, 33, 35, 36, 38, 42, 44, 45, 46, 48) and 15 on the exposed site (tag numbers 1, 3, 6, 10, 12, 13, 17, 23, 25, 27, 29, 33, 41, 42, 46). Sampling was done at tidal heights of 0.5, 1, 1.5, 2, 2.5, 3 and 3.5m. Quadrats of 25x25cm were used to estimate algal cover, sessile invertebrate cover, and invertebrate density. Quadrats of 50x50cm were used to sample invertebrates in the class Polyplacophora and phylum Echinodermata. Data was collected by students in the Coastal Biodiversity and Conservation course taught by Dr. Tom Herman and Dr. Barb Beasley with Teaching Assistant Ben Starkhouse July 23-Aug 31, 2007.1997年，班菲尔德海洋科学中心（Bamfield Marine Sciences Centre）启动了一项长期监测项目（long-term monitoring project），旨在收集巴克利湾（Barkley Sound）向导岛（Wizard Islet）两处潮间带站点（intertidal sites）的大型生物（macroorganisms）分布与丰度基线数据；2001年对两处站点均开展了重采样（resampled），2002年与2003年仅对暴露型站点（exposed site）进行了重采样，2007年两处站点再次接受采样，本数据集公开的监测指标包括藻类盖度（algal cover，%）、固着无脊椎动物盖度（sessile invertebrates cover，%）以及无脊椎动物密度（invertebrates density）。向导岛（48°51’29.5"N, 125°09’31"W）隶属于巴克利湾的迪尔群岛群（Deer Group Islands），低潮时总面积为1.73公顷；受庇护站点（sheltered site，波浪暴露程度更低）位于岛屿东北侧一段50米长的固定岩岸（rocky shore），以墨角藻属（Fucus）和大叶藻属（Phyllospadix，海草）为典型特征，暴露型站点则位于岛屿西南侧一段50米长的固定岩岸，以巨藻属（Egregia，羽藻海带）、茗荷壳藤壶（goose-necked barnacles）以及裙带菜属（Alaria，褐藻）为典型特征。研究随机选取垂直样带（vertical transects）开展采样：受庇护站点共布设17条（标签编号：5、13、20、21、26、28、31、32、33、35、36、38、42、44、45、46、48），暴露型站点共布设15条（标签编号：1、3、6、10、12、13、17、23、25、27、29、33、41、42、46）；采样在0.5、1、1.5、2、2.5、3及3.5米的潮高下进行，其中采用25×25厘米的样方（quadrats）估算藻类盖度、固着无脊椎动物盖度及无脊椎动物密度，采用50×50厘米的样方对多板纲（Polyplacophora）无脊椎动物及棘皮动物门（Echinodermata）类群进行采样。本数据集的野外数据采集工作由汤姆·赫尔曼博士（Dr. Tom Herman）与芭芭·比斯利博士（Dr. Barb Beasley）授课的《海岸生物多样性与保护》（Coastal Biodiversity and Conservation）课程的学生完成，采集时段为2007年7月23日至8月31日，教学助理（Teaching Assistant）为本·斯塔克豪斯（Ben Starkhouse）。