Abstract Since its establishment in the Americas, the invasive species Chrysomya albiceps has been displacing native species such as Cochliomyia macellaria. Behavioural traits associated with this phenomenon are poorly understood, particularly in semiarid environments, as in the Caatinga, the largest seasonally dry tropical forest in the world, endemic to Brazil, where resource availability is critical. Under hot and dry conditions, differences in flight activity may influence competitive abilities. We investigated the preferential time of flight of C. albiceps and C. macellaria in a fragment of Caatinga, based on the capture of adults in baited traps. Four diurnal treatments were used: 05:30 h to 08:30 h (early morning), 8:30 h to 11:30 h (late morning), 11:30 h to 14:30 h (early afternoon) and 14:30 h to 17:30 h (late afternoon), plus collections from 17:30 h to 05:30 h of the following day (night time). The results revealed that C. macellaria was almost three times more abundant than C. albiceps and that both species were least captured in the early morning and increasingly so during the day until the latter treatment. Curiously, no insect was collected in nocturnal samples. Contradictorily to our initial hypothesis, flies were mostly captured in the hottest and driest periods of the day. The similarity in flight temporal activity between the two species suggests that they may arrive at (and colonize) a substrate at the same time, with important implications for carrion ecology and forensic entomology.

中文翻译：

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本地和入侵的苍蝇（双翅目：Calliphoridae）物种的优先飞行时间是否不同？来自季节性干燥热带森林的经验证据

摘要 入侵物种Chrysomya albiceps 自从在美洲建立以来，就一直在取代本地物种，如Cochliomyia macellaria。人们对与这种现象相关的行为特征知之甚少，特别是在半干旱环境中，例如卡廷加，这是世界上最大的季节性干燥热带森林，是巴西特有的，资源可用性至关重要。在炎热干燥的条件下，飞行活动的差异可能会影响竞争能力。我们调查了 Caatinga 片段中 C. albiceps 和 C. macellaria 的优先飞行时间，基于在诱饵陷阱中捕获的成虫。使用了四种昼夜治疗：05:30 h 至 08:30 h（清晨）、8:30 h 至 11:30 h（上午晚些时候）、11:30 h 至 14:30 h（下午早些时候）和 14： 30 小时至 17:30 小时（下午晚些时候），加上从 17:30 到第二天（夜间）05:30 的集合。结果显示，C. macellaria 的数量几乎是 C. albiceps 的三倍，而且这两种物种在清晨捕获的次数最少，而在白天捕获的次数越来越多，直到后者处理。奇怪的是，在夜间样本中没有收集到昆虫。与我们最初的假设相反，苍蝇大多是在一天中最热和最干燥的时期捕获的。这两个物种之间飞行时间活动的相似性表明它们可能同时到达（并定植）基质，这对腐肉生态学和法医昆虫学具有重要意义。白头肌，并且这两个物种在清晨被捕获的次数最少，并且在白天越来越多，直到后一种处理。奇怪的是，在夜间样本中没有收集到昆虫。与我们最初的假设相反，苍蝇大多是在一天中最热和最干燥的时期捕获的。这两个物种之间飞行时间活动的相似性表明它们可能同时到达（并定植）基质，这对腐肉生态学和法医昆虫学具有重要意义。白头肌，并且这两个物种在清晨被捕获的次数最少，并且在白天越来越多，直到后一种处理。奇怪的是，在夜间样本中没有收集到昆虫。与我们最初的假设相反，苍蝇大多是在一天中最热和最干燥的时期捕获的。这两个物种之间飞行时间活动的相似性表明它们可能同时到达（并定植）基质，这对腐肉生态学和法医昆虫学具有重要意义。