BIOL 2050 Labs 5 + 6, Invertebrate abundance and diversity in grassland and pond environments

Data was collected for field experiment near York University's Stong Pond west of the Osgoode woodlot on October 14th and 21st 2015. It was 13 degrees Celsius on the 14th with a Beaufort number of 4, and 11 degrees Celsius with a Beaufort number of 3 on the 21st. 36 pan traps (12 each of blue, yellow, and white) were placed in a rarely mowed rectangular area roughly 5 m by 25 m, with one edge touching the waterline of Stong Pond. Starting from the edge of the water, a 25 m long transect was placed. Every 5 m interval (0 m, 5 m, 10 m, 15 m, 20 m, and 25 m) another transect 5m in length was placed perpindicular to the first 25 m transect and roughly parallel to the water's edge. Along each of these secondary transects 6 pan traps were evenly distrbuted, 2 of each colour, so that there was a trap every 1 m within each row. To randomize the trap colours each of the 6 spots within each row were given a number between 1 - 6. A die would be rolled, and for each bowl, the number rolled would correspond to a spot on the transect row. Rolls for spots already taken were rerolled until that row was filled with bowls (2 each of yellow, blue, and white). This was repeated for each row until there were 36 total traps placed. Each trap was filled one quarter of the way up with soapy water, starting with traps closet to the water, then working eastward. After 1.5 hours had elapsed the traps were observed and data was recorded on the number and species of intertebrates found, most of which were insects. Plant species diversity was also recorded for each row of 6 traps. Only plant species that touched or crossed the transect for each row perpendicular to the water were recorded.

本数据集采集于2015年10月14日与21日，采样地点位于约克大学（York University）奥斯古德林地（Osgoode woodlot）西侧的斯通池塘（Stong Pond）附近野外实验场地。两次采样当日气温分别为13℃与11℃，蒲福数（Beaufort number）分别为4级与3级。共布设36个盘式诱捕器（pan traps），包含蓝色、黄色、白色三种类型，每种各12个。诱捕器布设区域为一处极少进行修剪的矩形区域，尺寸约5 m ×25 m，其中一侧边缘紧邻斯通池塘的水岸线。以水岸边缘为起点布设一条长25 m的主样带。沿该主样带，在0 m、5 m、10 m、15 m、20 m、25 m共6个节点处，各布设一条垂直于主样带、大致平行于水岸的5 m长副样带。每条副样带上均匀布设6个盘式诱捕器，每种颜色各2个，即诱捕器沿副样带以1 m间隔分布。为实现诱捕器颜色的随机分配，将每条副样带上的6个布设点位编号为1至6，通过掷骰子确定每个点位的诱捕器颜色：若掷出的点位已被占用，则重新掷骰，直至该副样带的三种颜色各2个诱捕器全部布设完成。该布设流程重复至所有6条副样带完成布设，最终累计设置36个诱捕器。所有诱捕器均装入四分之一容量的肥皂水，布设顺序从靠近水岸的副样带开始，向东依次推进。布设完成1.5小时后，对诱捕器进行回收，记录其中采集到的无脊椎动物（多数为昆虫）的个体数量与物种信息。同时记录每条副样带（对应6个诱捕器所在区域）的植物物种多样性，仅统计触碰或跨越对应副样带的植物物种。