The stable fly Stomoxys calcitrans (L.) is a cosmopolitan biting fly of both economic and welfare concern, primarily as a result of its painful bite, which can cause blood loss, discomfort and loss of productivity in livestock. Between June and November in 2016 and May and December in 2017, Alsynite sticky-traps were deployed at four Donkey Sanctuary sites in southwest England, which experience recurrent seasonal biting fly problems. The aim was to evaluate the seasonal dynamics of the stable fly populations and the risk factors associated with abundance. In total, 19 835 S. calcitrans were trapped during the study period. In both years, abundance increased gradually over summer months, peaking in late August/September. There were no relationships between seasonally detrended abundance and any climatic factors. Fly abundance was significantly different between sites and population size was consistent between years at three of the four sites. The median chronological age, as determined by pteridine analysis of flies caught live when blood-feeding, was 4.67 days (interquartile range 3.8-6.2 days) in males and 6.79 days (interquartile range 4.8-10.4 days) in females; there was no significant, consistent change in age or age structure over time, suggesting that adult flies emerge continuously over the summer, rather than in discrete age-related cohorts. The data suggest that flies are more abundant in the vicinity of active animal facilities, although the strong behavioural association between flies and their hosts means that they are less likely to be caught on traps where host availability is high. The implications of these results for fly management are discussed.

中文翻译：

---

英格兰西南部稳定的蝇Stomoxys calcitrans的季节性丰度。

稳定的果蝇Stomoxys calcitrans（L.）是一种具有国际和经济意义的咬蝇，主要是由于其痛苦的叮咬而造成的，这种叮咬可能导致失血，不适和家畜生产力下降。在2016年6月至11月以及2017年5月至12月之间，Alsynite粘性诱集装置被部署在英格兰西南部的四个Donkey Sanctuary地点，这些地点经常遇到季节性的咬蝇问题。目的是评估稳定果蝇种群的季节动态以及与丰度相关的危险因素。在研究期间，总共捕获了19 835个S.calcitrans。在这两年中，丰度在夏季都逐渐增加，在8月下旬/ 9月达到峰值。季节性下降趋势的丰度与任何气候因素之间都没有关系。四个地点中三个地点之间的苍蝇丰度显着不同，并且种群数量在年份之间保持一致。通过蝶啶分析确定的采血时活着的苍蝇的中位年龄，雄性为4.67天（四分位数范围为3.8-6.2天），雌性为6.79天（四分位数范围为4.8-10.4天）；年龄或年龄结构没有随时间变化的显着，一致的变化，这表明成年苍蝇在整个夏季不断出现，而不是与年龄相关的离散人群。数据表明，在活跃的动物设施附近，果蝇更为丰富，尽管果蝇与其寄主之间的强烈行为联系意味着它们不太可能被寄养在寄主利用率高的陷阱上。