School of Biological & Environmental Sciences, John Moores University, Liverpool, L3 3AF, UK.
Forensic Sci Int. 2020 Oct;315:110465. doi: 10.1016/j.forsciint.2020.110465. Epub 2020 Aug 19.
This article discusses the ability of the sarcophagid fly Sarcophaga argyrostoma (Robineau-Desvoidy) to exploit various food sources. These include living, freshly dead, and highly decayed remains. It also considers the factors affecting larval thermogenesis and compares S. argyrostoma with Lucilia sericata (Meigen). In addition, the ability of S. argyrostoma to colonise buried baits, those out of reach, and those protected by bandaging is considered. Both fresh and decayed liver stimulated ovoviviposition by S. argyrostoma and oviposition by L. sericata. Even liver that had decayed for 840 days supported larval development by both species to adulthood. Thermogenesis during larval development was dependent upon larval density. There was no difference in thermogenesis characteristics between S. argyrostoma and L. sericata or between diets of fresh liver and fresh minced pork. Thermogenesis was less pronounced on 840-day-old liver than on fresh liver but was still dependent upon larval density and there was no species effect. When starved, third instar S. argyrostoma larvae did not exhibit cannibalism or attack third instar L. sericata larvae. Sarcophaga argyrostoma adults could detect fresh liver baits buried at 20 cm in loose soil and ovoviviposited on the soil surface. The larvae then rapidly crawled through the soil to reach the baits and completed their development below ground. Sarcophaga argyrostoma also colonised baits that were at least 5 cm out of reach by dropping larvae onto them. They could infest baits through gauze bandages but not wound dressings. The adults would not ovoviviposit on living invertebrates but dead snails and dead L. sericata third instar larvae were infested and supported larval growth to adulthood. The adults were willing to ovoviviposit on human faeces and it supported larval growth to adulthood. Human urine stimulated very limited ovoviviposition and the larvae all died shortly afterwards and without developing. They did not ovoviviposit on banana or melon.
本文讨论了沙潜蝇 Sarcophaga argyrostoma（Robineau-Desvoidy）利用各种食物来源的能力。这些食物来源包括活体、刚死亡的尸体和高度腐烂的尸体。它还考虑了影响幼虫生热的因素，并将 S. argyrostoma 与丝光绿蝇（Meigen）进行了比较。此外，还考虑了 S. argyrostoma 殖民埋藏诱饵、不可及的诱饵和用绷带保护的诱饵的能力。新鲜和腐烂的肝脏都能刺激 S. argyrostoma 的卵胎生和 L. sericata 的产卵。即使是已经腐烂 840 天的肝脏也能支持这两个物种的幼虫发育到成虫。幼虫发育过程中的生热取决于幼虫密度。S. argyrostoma 和 L. sericata 之间或新鲜肝脏和新鲜肉末之间的生热特征没有差异。与新鲜肝脏相比，840 天的肝脏上的生热现象不那么明显，但仍然取决于幼虫密度，并且没有物种效应。饥饿的三龄 S. argyrostoma 幼虫不会发生同类相食或攻击三龄 L. sericata 幼虫。成年沙潜蝇可以探测到埋在松散土壤中 20 厘米深的新鲜肝脏诱饵，并在土壤表面进行卵胎生。然后，幼虫迅速通过土壤到达诱饵，并在地下完成发育。Sarcophaga argyrostoma 还可以殖民至少 5 厘米不可及的诱饵，将幼虫滴落在诱饵上。它们可以通过纱布绷带感染诱饵，但不能通过创可贴。成虫不会在活体无脊椎动物上进行卵胎生，但会感染死亡的蜗牛和死亡的 L. sericata 三龄幼虫，并支持幼虫生长到成虫。成虫愿意在人类粪便上进行卵胎生，并支持幼虫生长到成虫。人类尿液刺激非常有限的卵胎生，随后幼虫全部死亡，没有发育。它们不会在香蕉或瓜上进行卵胎生。
