Ecology Lab 5: Completed Experimental Design

Data collected from a field experiment investigating edge effects on the relationship of insect abundance and vegetation density on two different days in a grassy lot at York University. 25 meters of transect tape was laid out beginning from the edge of the grassland towards the center of the field. The edge was deemed to be any area where the grassland seemed to end or taper off. Small holes were dug for the pitfall traps, which were placed 5 meters apart from each other along the transect line. Their position relative to the edge of the grassland was measured by the transect line and was recorded. A 1m by 1m quadrat was placed on each trap, with the trap in the center, and the vegetation density was calculated by estimating the number of individual grasses and plants. This process was repeated for a total of 4 different transects with 5 pitfall traps on each line, so a total of 20 pitfall traps were placed and subsequently examined after 1.5 hours to check for trapped insects.

本数据集源自一项野外实验，旨在探究边缘效应（edge effects）对昆虫丰度与植被密度之间关系的影响，实验于约克大学（York University）一片草本样地内分两日开展。沿草地边缘向样地中心布设25米长的样带卷尺，将草地出现终止或逐渐稀疏的区域界定为样地边缘。沿样带每隔5米挖掘小型坑洼以布设地面陷阱（pitfall traps），通过样带卷尺测量并记录各陷阱相对于草地边缘的位置。每个陷阱上方放置1m×1m的样方（quadrat），将陷阱置于样方中心，通过计数单个草本与植物的个体数量估算植被密度。该流程共重复开展4条样带的布设工作，每条样带布设5个地面陷阱，总计布设20个地面陷阱；陷阱放置1.5小时后进行回收，以统计捕获的昆虫个体数量。