Terrestrial Reptile Counts in Do??ana 2005-2021

The monitoring of the reptile community in Do??ana was initiated in 2005 as part of the Monitoring Program of Natural Resources and Processes. The aim was to obtain a temporal and continuous series of data in the abundance of reptile species and analyze the trends to detect changes in their populations. The records are collected annually between 2005-2021 by members of the monitoring team which perform 7 sampling transects in different habitats (dunes and Mediterranean vegetation) three times per year in the periods when reptile activity is high (March-June and September-October), with good environmental conditions (temperature between 17 and 25???C and absence of rain). Reptiles species are visually searched along the transects (linear or circular) that are carried out by one person on foot. Length transects are variable, averaged 1858 ?? 51.86 meters, where all reptiles detected are recorded in the app Cybertracker. Three transects runs through wooden footpaths (within the Natural Park) and four transects (within the National Park) are placed on sand-trails surrounded by Mediterranean shrublands. The method used records only terrestrial species since it has not been able to detect those species that have a fossorial behaviour (the Mediterranean Worm Lizard Blanus cinereus) or those species that used to be frequently hidden in dense vegetation (the Mediterranean Chamaleon Chamaeleo chamaeleon). Data recorded during the surveys include weather description (cloud cover, temperature, rain, or wind speed), species identification, number of individuals, sex and life stage of the reptiles when possible, as well as time and georeferenced data of the observation. Between 2005-2007 data is registered in Excel file and since 2008 data is recorded in CyberTracker sequence (see protocol). The protocol used has been supervised by herpetological researchers and the data have been validated by the members who performed the transects.

多尼亚纳（Doñana）爬行动物群落监测工作于2005年启动，隶属于《自然资源与过程监测计划》。本项目旨在获取爬行动物物种丰度的时间连续序列数据，并通过趋势分析探测其种群变化。2005至2021年间，监测团队成员每年开展数据采集：在爬行动物活动活跃期（3月至6月、9月至10月），于不同生境（沙丘与地中海植被区）布设7条样线（transect），每年开展3次采样，且采样时需保证环境条件适宜（气温介于17℃至25℃且无降雨）。采样由单人徒步完成，沿直线或环形样线目视搜寻爬行动物。样线长度不固定，平均长度为1858±51.86米，所有被发现的爬行动物均通过Cybertracker应用程序进行记录。其中3条样线途经自然公园内的木质步道，剩余4条样线位于国家公园范围内，布设于被地中海灌丛环绕的沙质步道之上。本采样方法仅能记录陆生物种，无法探测到具有穴居习性的物种（如地中海蠕蜥*Blanus cinereus*），或是常隐匿于茂密植被中的物种（如地中海变色龙*Chamaeleo chamaeleon*）。调查记录的数据包括：天气状况（云量、气温、降雨或风速）、物种鉴定结果、个体数量、可识别的爬行动物性别与生活史阶段，以及观测时间与地理坐标数据。2005至2007年间的数据以Excel文件形式存储，自2008年起则通过CyberTracker序列进行记录（详见采样规程）。本次研究采用的采样规程已由两栖爬行动物学家审核，且所有数据均经样线采样人员交叉验证。