Carrion flies used to colonize dead and decomposed carcasses soon after death thus aids in estimating Post-mortem interval (PMI) during forensic investigations. By recruiting and engaging huge microbial fauna, they also accelerate decomposition process which in turn helps in the maintenance of the proper saptio-temporal functioning of the food web. Thus, this carrion flies not only assist in forensic investigations but also in nutrient recycling. During this study the species composition, abundance and succession patterns of carrion flies were thoroughly studied on house rat (Rattus rattus) carcasses in two different habitats and during two different months of the year (March and November, 2020). Kolkata, West Bengal was chosen as the urban habitat whereas Hooghly district of West Bengal was selected as the suburban study site. The succession wave of carrion flies on house rat carcasses started with muscids, Synthesiomyia nudiseta in theurban habitat and ended with Atherigona orientalis in the urban study site during March and November, 2020. In the suburban habiat, the colonization wave of carrion flies commenced with Calliphoridae, Chrysomya megacephala and Atherigona orientalis (Muscidae) was the last species found on decomposed carcasses in March 2020. In contrast, Sarcophagidae, Sarcophaga albiceps was the first species to visit the rat carcasses whereas, Phoridae, Megaselia scalaris was the last species to colonize the decomposed carcasses during November 2020. Synthesiomyia nudiseta was the most abundant species in the urban habitat during March and November 2020 whereas; Chrysomya megacephala and Sarcophaga ruficornis were found to be the most abundant species of house rat carcasses during March and November 2020, respectively. This study represent a detailed research on succession patterns of carrion flies on house rat carcasses (a mammalian model) in different times of the year 2020, which will assist in future research on medico-legal investigations specifically from Southern part of West Bengal.
Rashmi Bhattacherjee, Dhriti Banerjee, Shyamasree Ghosh. Chronology of appearance pattern and colonization of nutrient recycling forensic flies on house rat carcasses (rattus rattus) in urban and semi-urban habitats of southern part of west Bengal. International Journal of Entomology Research, Volume 6, Issue 2, 2021, Pages 148-156