Biocomplexity at North Temperate Lakes LTER; Whole Lake Manipulations: Exotic Crayfish Removal 2001 - 2010

As part of a whole-lake experiment to overexploit a rusty crayfish (O. rusticus) population in Sparkling Lake, Vilas County, Wisconsin, crayfish were intensively trapped and removed from the lake from early to mid June through late August starting from 2001through 2008. From 2001 to 2004, removal traps were concentrated on the southern and western shorelines of the lake, where cobble is prevalent and catch rates were highest. Starting in 2005, additional traps were used and trapping effort was spread around the entire perimeter of the lake. Additional traps (perimeter) were set on standard arrays at 43 sites around the lake at 1 m deep from 2001 through 2006. In 2001 and 2003, traps (depth transect) were also set on standard arrays that ranged from 0.5 to 12 m deep. From 2001-2004, trap_site corresponds to one of the 43 standard sites where the trap was set. For perimeter and depth transect trapping, one trap is set at a trap site. During the removal trapping, 10 traps are set at each of the standard trapping sites. The trap_id identifier contains more information about the spatial location of a removal trap. From 2005-2008, traps were numbered sequentially moving clockwise around the lake starting at site 1, with no reference to standard trapping sites from previous years. In 2009, traps were set at the 43 standard sites. Capture data were recorded in 2009 but crayfish were not removed. Daily catch statistics: The data table Crayfish Daily Capture Summary provides the number of each species captured each day in the perimeter and removal traps. Also included are data on the number of traps pulled on that day and the number of trap_days these traps represent. These data can be used to calculate capture rates. The data table Crayfish Daily Capture by Station has daily catch statictics for 2009 at the capture site level. Crayfish length measurements: Prior to 2005, a crayfish that was measured could be associated with the specific trap in which it was captured. These length data are included in the Crayfish Individual data table. Starting in 2005, carapace measurements were only taken on 50 randomly selected O. rusticus individuals each day. The data table Crayfish Carapace Length contains these data which are not associated with specific traps. Trap site locations: The data table Sparkling Lake Crayfish Trap Sites contains the location of the 43 standard crayfish trap sites. See Crayfish Removal Protocol for further explanation of TECHNIQUE and TRAP_ID fields. Number of sites: 43 trap sites Sampling Frequency: annually during summer本数据集源自一项针对威斯康星州维拉斯县闪光湖（Sparkling Lake）内锈色螯虾（rusty crayfish, O. rusticus）种群开展的全湖过度清除实验。2001年至2008年每年夏季，研究人员于6月初至8月末期间，通过高强度诱捕对湖内螯虾进行集中移除。 2001年至2004年，诱捕器主要布设于湖泊南岸与西岸——该区域砾石广泛分布且捕获率最高。2005年起，新增诱捕器的布设范围扩展至湖泊全周岸线。2001年至2006年，环湖诱捕阵列（perimeter）设置于全湖43个标准位点，布设水深均为1米。2001年与2003年，研究人员还在水深0.5至12米的梯度范围内布设了深度样带（depth transect）诱捕阵列。 2001年至2004年，trap_site对应诱捕器布设的43个标准位点之一。环湖与深度样带诱捕作业中，每个位点仅布设1台诱捕器；而移除诱捕作业中，每个标准诱捕位点则布设10台诱捕器。trap_id标识符可提供移除用诱捕器的空间位置详细信息。2005年至2008年，诱捕器按顺时针顺序从位点1开始依次编号，不再沿用往年的标准诱捕位点编号规则。2009年，诱捕器重新布设至43个标准位点，当年仅记录捕获数据并未移除螯虾。 日捕获统计数据：《螯虾日捕获汇总表》（Crayfish Daily Capture Summary）记录了环湖诱捕与移除诱捕每日捕获的各物种数量，同时包含当日起吊的诱捕器数量以及这些诱捕器对应的总诱捕天数（trap_days）数据，可用于计算捕获率。《站点级螯虾日捕获数据表》（Crayfish Daily Capture by Station）则提供了2009年各捕获位点的日捕获统计信息。 螯虾体长测量：2005年之前，被测螯虾可关联至其被捕获的具体诱捕器，此类体长数据收录于《螯虾个体数据表》（Crayfish Individual）。2005年起，研究人员仅每日随机选取50只锈色螯虾个体进行头胸甲（carapace）测量，此类数据收录于《螯虾头胸甲长度数据表》（Crayfish Carapace Length），且无法关联至具体诱捕器。 诱捕位点信息：《闪光湖螯虾诱捕位点表》（Sparkling Lake Crayfish Trap Sites）包含43个标准螯虾诱捕位点的位置信息。有关TECHNIQUE与TRAP_ID字段的详细说明，请参阅《螯虾移除操作规程》（Crayfish Removal Protocol）。 基本参数：位点数量为43个诱捕位点；采样频率为夏季每年1次。