Skoda S R, Thomas G D, Campbell J B
Department of Entomology, University of Nebraska, Lincoln 68583-0938, USA.
J Econ Entomol. 1996 Apr;89(2):428-34. doi: 10.1093/jee/89.2.428.
Core samples and cylindrical pupal traps were used to monitor immature stages of the stable fly, Stomoxys calcitrans (L.), and house fly, Musca domestica L., from 5 sample areas in beef feedlot pens: the feed apron-soil interface, the back fence, the side (pen dividing) fence, the mound, and the general lot. One feedlot was sampled during 1986, two feedlots were sampled in 1987, and three samples were taken at random from each sample area on each sample date. Core samples showed that both populations were highest from the feed apron sample area. Pupal traps tended to show the same result but differences between sample areas were not significant for immature stable flies. Both sampling methods generally indicated similar population trends of the 2 fly species over the season; correlation coefficients between the 2 sampling methods were generally significant but few correlations were strong and large divergences between population trends were present. Only approximately 69% of the total number of pupal traps placed were recovered; the loss of traps could have contributed to differences between the 2 sampling methods. Core sampling would be preferred if lower variance of samples is important; if collecting pupae of known age is important, then pupal traps may be useful if they are protected from trampling by cattle.
在肉牛饲养场围栏的5个采样区域（饲料围裙与土壤的交界处、后围栏、侧（围栏分隔）围栏、土堆和整个场地），使用岩心样本和圆柱形蛹诱捕器来监测厩螫蝇（Stomoxys calcitrans (L.)）和家蝇（Musca domestica L.）的未成熟阶段。1986年对一个饲养场进行了采样，1987年对两个饲养场进行了采样，并且在每个采样日期从每个采样区域随机采集三个样本。岩心样本显示，两个种群在饲料围裙采样区域的数量最高。蛹诱捕器往往显示出相同的结果，但对于未成熟的厩螫蝇，采样区域之间的差异并不显著。两种采样方法总体上都表明了这两种蝇类在整个季节的种群趋势相似；两种采样方法之间的相关系数总体上是显著的，但很少有强相关性，并且种群趋势之间存在较大差异。放置的蛹诱捕器总数中只有约69%被回收；诱捕器的丢失可能导致了两种采样方法之间的差异。如果样本的低方差很重要，那么岩心采样会更受青睐；如果收集已知年龄的蛹很重要，那么如果蛹诱捕器能防止被牛践踏，可能会很有用。
