Swedish University of Agricultural Sciences, Department of Plant Protection Biology, Unit of Chemical Ecology, Box 102, 230 53, Alnarp, Sweden.
Agriculture, Health and Environment Department, Natural Resources Institute, University of Greenwich, Kent, ME4 4TB, UK.
J Vector Ecol. 2020 Jun;45(1):45-56. doi: 10.1111/jvec.12372.
Effective surveillance is essential for protecting livestock from Culicoides biting midges and the viruses they transmit. The objective of this study was to determine how the baiting system used in traps (UV, incandescent light, incandescent light with CO , and incandescent light with CO and 1-octen-3-ol) influences estimates of midge population abundance, parity, and diel activity. This was achieved through a standardized trapping protocol conducted in three habitats in Sweden. UV light traps caught the most Culicoides species and more C. obsoletus complex females than incandescent light traps. Traps baited with CO plus 1-octen-3-ol caught more female C. impunctatus than incandescent light traps. No consistent effect of bait type was found on C. obsoletus parity rate, as estimated from the proportion of midges with presence or absence of pigmentation. Midge activity, as reflected by trap catches, peaked between -3 h and +3 h relative to sunset, with UV traps catching significantly more female C. obsoletus complex and C. impunctatus at and after sunset than before sunset. We conclude that baiting system can influence biting midge collections, even using identical traps. Effective surveillance may require more than one bait type and kairomones to attract species that do not feed exclusively on cattle.
有效的监测对于保护牲畜免受厩螫蝇和它们传播的病毒至关重要。本研究的目的是确定诱捕器中使用的诱捕系统（紫外线、白炽光、含 CO 的白炽光和含 CO 和 1-辛烯-3-醇的白炽光）如何影响厩螫蝇种群数量、生殖力和昼夜活动的估计。这是通过在瑞典的三个生境中进行标准化的诱捕协议来实现的。紫外线诱捕器捕捉到的厩螫蝇种类最多，捕捉到的 C. obsoletus 复合体雌蝇也多于白炽光诱捕器。用 CO 和 1-辛烯-3-醇诱捕的诱捕器比白炽光诱捕器捕捉到更多的雌性 C. impunctatus。从有或没有色素沉着的蚊虫比例来估计，诱捕剂类型对 C. obsoletus 生殖力没有一致的影响。蚊虫活动（反映在诱捕器捕获量上）在日落前 3 小时到日落后 3 小时之间达到峰值，紫外线诱捕器在日落时和日落之后捕获到的雌性 C. obsoletus 复合体和 C. impunctatus 明显多于日落前。我们得出结论，诱捕系统会影响吸血蝇的采集，即使使用相同的诱捕器也是如此。有效的监测可能需要不止一种诱捕剂类型和信息素来吸引那些不以牛为唯一食物来源的物种。
