Bicheno region urchin barrens from AUV imagery

This data set consists of a scored time-series of Autonomous Underwater Vehicle (AUV) images from the Bicheno region on the east coast of Tasmania. Surveys were conducted between 2011 and 2016 within the Governor Island Marine Reserve and nearby sites outside the reserve. Governor Island was surveyed in 2011, 2013, 2014 and 2016. The outside sites of Trap Reef, Cape Lodi and Butlers Point were surveyed in 2011, 2013 and 2016. Imagery across all surveys was scored for the presence of Centrostephanus rodgersii urchin barrens across rocky reef at each site. Prior to analysis the data was subsetted to every fifth image to avoid overlapping images. The data set also contains depth information for each image and a measure of rugosity (Vector Rugosity Measure) computed in ArcGIS software from a one metre resolution bathymetric map covering the survey sites. Analysis was conducted to examine the trend in the presence of barrens through time and to compare the occurrence of barrens inside the Governor Island Marine Reserve with sites outside the reserve. A spatio-temporal model incorporating both spatial and temporal correlation in the time-series of data was used. This data set contains the scored data used in the analysis.Further details of the methods used and results are contained in the following article. Please cite any use of the data or code by citing this article:Perkins NR, Hosack GR, Foster SD, Monk J, Barrett NS (2020) Monitoring the resilience of a no-take marine reserve to a range extending species using benthic imagery. PLOS ONE 15(8): e0237257. https://doi.org/10.1371/journal.pone.0237257

本数据集源自塔斯马尼亚东海岸比奇诺（Bicheno）区域的带标注时间序列自主水下航行器（Autonomous Underwater Vehicle, AUV）影像。调查于2011年至2016年间在总督岛海洋保护区（Governor Island Marine Reserve）及其保护区外邻近点位开展：总督岛海洋保护区分别于2011、2013、2014及2016年完成调查；陷阱礁（Trap Reef）、洛迪角（Cape Lodi）与巴特勒斯角（Butlers Point）这三处保护区外点位则于2011、2013及2016年完成调查。所有调查所获影像均针对各点位岩礁区域内罗式长棘海胆（Centrostephanus rodgersii）海胆荒漠的存在情况进行了标注评分。分析前，为避免影像重复，数据集被抽选为每5张选取1张的子集。本数据集还包含每张影像的深度信息，以及基于覆盖调查点位的1米分辨率水深地形图，通过ArcGIS软件计算得到的矢量粗糙度测量法（Vector Rugosity Measure）指标。本研究开展分析以探究海胆荒漠出现情况随时间的变化趋势，并对比总督岛海洋保护区内外点位的海胆荒漠发生频次，采用了同时纳入数据时间序列空间与时间相关性的时空模型。本数据集包含本次分析所使用的标注评分数据。所用方法与研究结果的详细信息详见下述论文。若使用本数据集或代码，请引用下述论文：Perkins NR、Hosack GR、Foster SD、Monk J、Barrett NS（2020）《利用底栖影像监测无捕捞海洋保护区对扩散物种的恢复力》，PLOS ONE 15(8): e0237257。https://doi.org/10.1371/journal.pone.0237257