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笼捕获的螯虾样本，以及少量在其他鱼类采样渔具中偶获的螯虾记录。所有采样笼均设置于9个研究湖泊的翼网（fyke net）采样点位处，这9个湖泊分别为Allequash湖、Big Muskellunge湖、Crystal湖、Sparkling湖、Trout湖、Mendota湖、Monona湖、Wingra湖与Fish湖。2003年后，麦迪逊区域的Mendota湖、Monona湖、Wingra湖及Fish湖已停用螯虾笼作为采样渔具。所有捕获个体均会鉴定至物种水平并完成计数。针对Trout湖与Sparkling湖，研究团队于夏季开展了更多专项调查，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Sparkling湖的锈色螯虾实施了清除作业。相关研究文献：Catherine L Hein、Brian M Roth、Anthony R Ives与M Jake Vander Zanden发表于《加拿大渔业与水产科学期刊》（Canadian Journal of Fisheries and Aquatic Sciences）第63卷第2期第383-393页的论文《鱼类捕食与笼捕控制锈色螯虾（Orconectes rusticus）：全湖尺度实验》，DOI: 10.1139/f05-229。补充数据集包含Capelli（博士学位论文）与Lorman（博士学位论文）采集的长期生态研究（LTER）前序数据，该数据集于1972年6月下旬启动采集。该前序LTER数据的核心内容为Trout湖的详细物种分布数据，以及其余区域湖泊的群落组成数据。采样频率：每年1次。采样点位数量：9个。需注意：2020年因采样量不足，无对应有效数据集。