Jones C J, Kitron U D
Department of Veterinary Pathobiology, University of Illinois College of Veterinary Medicine, 2001 S. Lincoln Avenue, Urbana, IL 61802, USA.
J Med Entomol. 2000 May;37(3):408-15. doi: 10.1603/0022-2585(2000)037[0408:POISAI]2.0.CO;2.
From 1990 through 1997, Ixodes scapularis Say larvae and nymphs were sampled between May and October along a 400-m segment of a nature trail in a Lyme disease endemic site in northern Illinois. Ticks were removed from Peromyscus leucopus mice and collected via tick drags at approximately 3-wk intervals. Mouse population estimates along the trail varied from 2, in the spring of 1996 following a year of drought, to > 200 in 1993, the wettest year on record. During the 8-yr period, there were major droughts during the summers of 1991 and 1995. Cumulative degree-days were positively correlated with the number of ticks collected on drags in the same year and negatively correlated with larval tick populations for the following year (P < 0.05). Cumulative rainfall was positively correlated with larval tick abundance for the following year. This was most readily apparent by examination of the larval density on captured mice. In the year following each of two drought years, larval densities were significantly depressed compared with the 8-yr average at the site.
从1990年到1997年，在伊利诺伊州北部莱姆病流行地区的一条自然步道400米长的路段上，于5月至10月期间采集肩突硬蜱的幼虫和若虫。从白足鼠身上采集蜱，并通过蜱拖网以大约3周的间隔进行收集。沿着步道对鼠类种群数量的估计各不相同，从1996年春季干旱一年后的2只，到1993年（有记录以来最潮湿的年份）的200多只。在这8年期间，1991年和1995年夏季出现了严重干旱。累积度日数与同年通过拖网收集到的蜱的数量呈正相关，与次年的蜱幼虫种群数量呈负相关（P<0.05）。累积降雨量与次年的蜱幼虫丰度呈正相关。通过检查捕获小鼠身上的幼虫密度，这一点最为明显。在两个干旱年份之后的每一年，幼虫密度与该地点8年的平均水平相比都显著降低。
