North Temperate Lakes LTER: Crayfish Abundance 1981 - current

Crayfish data include crayfish catch in cylindrical minnow traps baited with beef liver and occasional occurrence in other gear used to sample fish. Traps are placed at fyke net locations in nine study lakes (Allequash, Big Muskellunge, Crystal, Sparkling, Trout, Mendota, Monona, Wingra and Fish). Crayfish traps have been eliminated as gear in the Madison area lakes (Mendota, Monona, Wingra, and Fish) after 2003. Individuals are identified to species and counted. In Trout and Sparkling Lake more detailed surveys have been conducted during the summer on an ad hoc basis to track distribution and abundance of the invading species Orconectes rusticus. In Sparkling lake Rusty Crayfish (Orconectes rusticus) was removed from 2001 to 2008. Catherine L Hein, Brian M Roth, Anthony R Ives, and M Jake Vander Zanden. Fish predation and trapping for rusty crayfish (Orconectes rusticus) control: a whole-lake experiment. Canadian Journal of Fisheries and Aquatic Sciences. 63(2): 383-393. https://doi.org/10.1139/f05-229. Additional data sets consist of pre-LTER sets (initiated in late June 1972) gathered by Capelli (Ph.D. dissertation) and Lorman (Ph.D. dissertation). Most of pre-LTER data is detailed distribution in Trout Lake, and community composition in other area lakes. Sampling Frequency: annually Number of sites: 9 Note that 2020 data does not exist due to insufficient sampling.

螯虾数据集涵盖以牛肝为诱饵的圆柱形小鱼诱捕笼捕获的螯虾样本，以及部分在其他鱼类采样渔具中偶然捕获的螯虾记录。采样笼布设于9个研究湖泊的翼网布设点位，分别为阿勒夸什湖（Allequash）、大马斯卡伦吉湖（Big Muskellunge）、水晶湖（Crystal）、斯帕克林湖（Sparkling）、特劳特湖（Trout）、门多塔湖（Mendota）、莫诺纳湖（Monona）、温格拉湖（Wingra）与菲什湖（Fish）。2003年后，麦迪逊区域的湖泊（门多塔湖、莫诺纳湖、温格拉湖与菲什湖）已停用螯虾诱捕笼作为采样渔具。所有螯虾个体均已鉴定至物种水平并完成计数。
针对特劳特湖与斯帕克林湖，研究团队于夏季开展临时专项调查，以追踪入侵物种锈色螯虾（Orconectes rusticus）的分布与种群丰度。2001年至2008年间，研究人员对斯帕克林湖内的锈色螯虾实施了清除作业。
引用文献：Hein CL, Roth BM, Ives AR, Vander Zanden MJ. 《鱼类捕食与螯虾笼捕控制锈色螯虾（Orconectes rusticus）：全湖实验》，《加拿大渔业与水产科学期刊》，63(2): 383-393，https://doi.org/10.1139/f05-229。
额外数据集包含由Capelli（博士学位论文）与Lorman（博士学位论文）采集的长期生态研究（Long-Term Ecological Research, LTER）前期数据，该数据集的采集工作始于1972年6月下旬。该LTER前期数据的核心内容为特劳特湖内的详细物种分布记录，以及其余研究湖泊的群落组成信息。
采样频率：每年1次
采样点位数量：9个
注意：2020年因采样不足，无有效数据集产出。