摘要
法医昆虫学已普遍用来确定凶杀案件中的死亡时间 ,而蝇蛆体长是较常应用到的指标。为了明确温度对蝇类幼虫体长变化的影响 ,在 16℃、 2 0℃、 2 4℃、 2 8℃、 32℃等恒温下对重要的法医昆虫大头金绳幼虫体长变化进行了观察。结果表明 :幼虫体长的变化可分为两个阶段 ,增长期和缩减期。增长期幼虫体长变化迅速 ,缩减期变化缓慢 ,只是在化蛹前不久幼虫体长才迅速缩减至蛹长。不同恒温下增长期和缩减期所需时间不同。利用Loglstic的改进方程y =(a +bx) (1+exp (c +dx) )对不同恒温下体长随时间的变化情况进行了模拟 。
Forensic entomology is now generally used to determine the time of human death in criminal cases.Maggots of the forensically important blowfly species Chrysomyia megacephala (Fabricius) were reard under different constant temperature conditions to determine the effects of temperature over maggot body length.The results showed that the body length change existed a rapid increase stage and a slow decrease stage,only before pupation the body length decreased rapidly to pupal size.Duration of the increase stage and decrease stages of different species under different temperature are different.The dependence of the larval change in length on the temperature conditions can be simulated with the improved Logistic function,i.e.,y=(a+bx)/(1+exp(c+dx)).
出处
《寄生虫与医学昆虫学报》
CAS
2002年第2期100-105,共6页
Acta Parasitologica et Medica Entomologica Sinica
基金
公安部资助项目
关键词
温度
大头金蝇
幼虫
体长变化
法医昆虫学
Forensic entomology\ Temperature Chrysomyia megacephala (fabricius)\ Body length
