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本数据集隶属于美国威斯康星州维拉斯县闪光湖（Sparkling Lake）的整湖实验项目，该实验旨在人为过度采捕锈色螯虾（*Orconectes rusticus*，O. rusticus）种群。2001年至2008年间，研究人员于每年6月上旬至中旬直至8月下旬，在该湖内通过密集布设诱捕笼开展螯虾捕捞与移除作业。2001年至2004年，移除用诱捕笼主要集中布设于湖岸南部与西部区域——该区域砾石底质分布广泛，且捕捞效率最高。自2005年起，研究人员增设更多诱捕笼，并将捕捞布设范围扩展至全湖沿岸区域。2001年至2006年，研究人员在全湖43个标准布设点（水深1米处）设置额外的沿岸型诱捕笼。2001年与2003年，研究人员还在水深范围为0.5至12米的标准断面布设了深度梯度型诱捕笼（depth transect）。2001年至2004年，`trap_site`字段对应诱捕笼所布设的43个标准点位之一。对于沿岸型与深度梯度型捕捞作业，每个布设点仅布设1台诱捕笼；而在移除作业期间，每个标准布设点则布设10台诱捕笼。`trap_id`标识符包含移除用诱捕笼的空间位置相关信息。2005年至2008年，诱捕笼以点位1为起点沿湖顺时针依次编号，不再关联往年的标准布设点位。2009年，研究人员在43个标准布设点布设诱捕笼，当年仅记录捕捞数据，未开展螯虾移除作业。 日捕捞统计数据：《Crayfish Daily Capture Summary》（螯虾日捕捞汇总）数据表提供了沿岸型与移除型诱捕笼每日捕获的各物种螯虾数量，同时包含当日起吊的诱捕笼数量以及这些诱捕笼对应的有效捕捞日数（trap_days），该数据可用于计算捕捞效率。《Crayfish Daily Capture by Station》（站点级螯虾日捕捞统计）数据表则提供了2009年各捕捞站点的日捕捞统计数据。 螯虾体长测量数据：2005年之前，测量过体长的螯虾可关联至其被捕获的具体诱捕笼，相关体长数据收录于《Crayfish Individual》（螯虾个体信息）数据表中。自2005年起，研究人员仅每日随机选取50只锈色螯虾（O. rusticus）个体开展头胸甲长度测量，相关数据收录于《Crayfish Carapace Length》（螯虾头胸甲长度）数据表中，且该数据不关联具体诱捕笼点位。 诱捕笼布设点位信息：《Sparkling Lake Crayfish Trap Sites》（闪光湖螯虾诱捕笼布设点位）数据表收录了43个标准螯虾诱捕笼布设点的位置信息。有关`TECHNIQUE`与`TRAP_ID`字段的详细说明，请参阅《Crayfish Removal Protocol》（螯虾移除作业规程）文档。 布设点位总数：43个诱捕笼布设点 采样频率：每年夏季开展一次采样