Measuring insect abundance depending on the effect of light and habitat at York University

The purpose behind this experiment was to determine the effects of habitat and amount of light on insect abundance. This experiment was performed at York University, at two different locations: Stong pond grassland and Danby woodlots on October 19th, 2015 and October 26th, 2015. The experiment time was approximately constant for the two days, around 3:00 pm. For the first day of experiments on October 19th, 2015 temperature was around 13 degrees Celsius, with wind speed at 9 mph and clear skies. On October 26th, 2015 temperature was 10 degrees Celsius, with a wind speed of 6 mph, skies on that day were more cloudy compared to October 19th, 2015. Data were collected in Danby Woodlot by Sarah Alsammarraie and Syed Yosuf, while Stong pond collection was done by Anosha Rahmany and Sharon Dhami. Data were collected using ten pan traps in the grassland area and ten pan traps in the woodlot area. Transect tape was used to measure 27 meters distance in a straight line into the woodlot allowing 3 meters between each pan trap. Ten pan traps of different colors were placed in an alternating order were no two consecutive color were the same. Pan traps were filled with soap-water solution; about half of the pan was filled with the solution to trap the insects in and the pans were set for an hour in the two habitats. When an hour had been passed, the insect abundance, canopy coverage and RTUs were measured at each location where there was a pan trap positioned. Canopy coverage was estimated by creating a square in the air above the pan trap using two fingers from each hand and raising the square along head height and looking through it to estimate the percentage of sky visible through that square. The exact same procedure was followed in day 1 and day 2.本实验旨在探究生境与光照量对昆虫丰度的影响。实验于2015年10月19日及26日在约克大学（York University）两处不同地点开展，分别为斯托塘草原（Stong pond grassland）与丹比林地（Danby woodlots）。两日实验的开展时段基本一致，均在当日下午3时左右启动。2015年10月19日实验当日，气温约13摄氏度，风速9英里每小时，天气晴朗；10月26日气温为10摄氏度，风速6英里每小时，当日天空相较19日更为多云。丹比林地的数据采集工作由Sarah Alsammarraie与Syed Yosuf完成，斯托塘草原的数据则由Anosha Rahmany与Sharon Dhami负责采集。本次实验采用10个盘式诱捕器（pan traps），分别在草原与林地生境中开展数据收集。使用样带卷尺（transect tape）沿直线向林地内部丈量27米，各盘式诱捕器间距设置为3米。将10个不同颜色的盘式诱捕器按交替顺序排布，确保无连续两个诱捕器颜色相同。盘式诱捕器内装填肥皂水混合液，至容器容量的一半左右以捕获昆虫，随后将诱捕器在两处生境中放置1小时。1小时后，在每个放置诱捕器的点位，分别测定昆虫丰度、冠层覆盖率（canopy coverage）与RTUs。冠层覆盖率的估算方法为：双手各伸出两指，在诱捕器上方的空中组成一个正方形，将该正方形抬至头部高度，透过该正方形估算可见天空的百分比。两日实验均严格遵循相同的操作流程。