Institute of Forensic Medicine, University of Bonn, Bonn, Germany.
Forensic Sci Int. 2010 Feb 25;195(1-3):52-7. doi: 10.1016/j.forsciint.2009.11.009. Epub 2009 Dec 30.
We investigated the time taken by blowflies to find and oviposit on fresh carcasses placed outdoors and indoors. Paired dead piglets, one in the open and the other in a nearby room (on the first floor of an occupied, detached, suburban house near Cologne, Germany, with a window opened 9 cm) were exposed simultaneously on nine occasions. The species visiting both locations and the number of egg batches deposited by blowflies between both locations were monitored 2, 8, 24 and 48 h after exposure. In all cases the indoor piglet carcass was exclusively infested by Calliphora vicina; only in one case, on a very hot day after a 48-h exposure did Lucilia sericata infest an indoor carcass. The outdoor piglets were infested by a variety of common corpse-visiting species: L. sericata, L. caesar, L. illustris, C. vicina and C. vomitoria. A significant difference in the number of egg batches was detected between indoors and outdoors. Furthermore, in only two of nine runs did oviposition occur within the first 24h of exposure indoors. Ambient temperature, daylength and rainfall had no significant effect on the number of egg batches. Moreover, we observed fewer larvae on indoor piglets, too few to form maggot masses. This might result in slower larval development than in the case of outdoor piglets. We conclude that post-mortem interval (PMI) estimation for corpses found indoors must be handled carefully as oviposition might have taken place with a delay up to 24h.
我们研究了丽蝇在户外和户内找到并产卵于新鲜尸体上所花费的时间。成对的死小猪，一只放在户外，另一只放在附近的房间里（在德国科隆附近的一栋独立郊区住宅的一楼，窗户打开 9 厘米），同时在九次暴露中进行了暴露。监测了同时访问两个地点的物种以及丽蝇在两个地点之间产下的卵批次数量，在暴露后 2、8、24 和 48 小时进行了监测。在所有情况下，室内小猪尸体都被 Calliphora vicina 独家侵扰；只有在一次非常炎热的天气下，经过 48 小时暴露后，Lucilia sericata 才会侵扰室内尸体。户外小猪被各种常见的尸体访问物种侵扰：L. sericata、L. caesar、L. illustris、C. vicina 和 C. vomitoria。室内和室外的卵批次数量存在显著差异。此外，在九次运行中，只有两次在室内暴露的前 24 小时内发生了产卵。环境温度、日照时间和降雨量对卵批次数量没有显著影响。此外，我们还观察到室内小猪的幼虫数量较少，太少而无法形成蛆块。这可能导致幼虫发育速度比户外小猪慢。我们得出结论，对于在室内发现的尸体，死后间隔（PMI）估计必须小心处理，因为产卵可能会延迟 24 小时。
