Gruner S V, Slone D H, Capinera J L, Turco M P
Entomology and Nematology Department, University of Florida, 1881 Natural Area Dr., Gainesville, FL 32611 (
United States Geological Survey, Wetland and Aquatic Research Center, 7920 NW 71st St., Gainesville, FL 32653 (
J Med Entomol. 2017 Jan;54(1):30-34. doi: 10.1093/jme/tjw139. Epub 2016 Aug 22.
Calliphorid species form larval aggregations that are capable of generating heat above ambient temperature. We wanted to determine the relationship between volume, number of larvae, and different combinations of instars on larval mass heat generation. We compared different numbers of Chrysomya megacephala (F.) larvae (40, 100, 250, 600, and 2,000), and different combinations of instars (∼50/50 first and second instars, 100% second instars, ∼50/50 second and third instars, and 100% third instars) at two different ambient temperatures (20 and 30 °C). We compared 13 candidate multiple regression models that were fitted to the data; the models were then scored and ranked with Akaike information criterion and Bayesian information criterion. The results indicate that although instar, age, treatment temperature, elapsed time, and number of larvae in a mass were significant, larval volume was the best predictor of larval mass temperatures. The volume of a larval mass may need to be taken into consideration for determination of a postmortem interval.
丽蝇科物种形成的幼虫聚集体能够产生高于环境温度的热量。我们想要确定幼虫聚集体的体积、幼虫数量以及不同龄期组合与幼虫群体产热之间的关系。我们比较了大头金蝇（Chrysomya megacephala (F.)）幼虫的不同数量（40、100、250、600和2000只），以及在两种不同环境温度（20和30°C）下不同龄期的组合（约50/50的一龄和二龄幼虫、100%二龄幼虫、约50/50的二龄和三龄幼虫以及100%三龄幼虫）。我们比较了13个拟合数据的候选多元回归模型；然后使用赤池信息准则和贝叶斯信息准则对模型进行评分和排序。结果表明，虽然龄期、年龄、处理温度、经过时间和群体中的幼虫数量都很重要，但幼虫聚集体的体积是幼虫群体温度的最佳预测指标。在确定死后间隔时可能需要考虑幼虫聚集体的体积。
