NCJ Number
145763
Journal
Journal of Forensic Sciences Volume: 38 Issue: 4 Dated: (July 1993) Pages: 938-949
Date Published
1993
Length
12 pages
Annotation
The decomposition of two pig carcasses in close proximity to each other, one exposed to sun and the other shaded, was observed and decay rates were documented.
Abstract
Shaded and unshaded study sites were about 300 meters apart in a wooded area near Olympia, Washington. The exposed site was in a clearing with direct sunlight from about 12 noon to 7 p.m. The shaded site was located in a dense forest area with approximately 80 percent cover. Daily observations of two white pigs were made at both sites simultaneously. Insects associated with the carcasses were noted, and samples were collected using aerial insect nets, aspirators, and pitfall traps. Insect activity was observed for 1 to 3 hours each day over the study period. Findings revealed that the exposed pig decomposed much faster than the shaded pig, reaching a stable minimal weight 2 weeks before the shaded carcass. Bloat size, body weight, occurrence of blow fly larvae, and ambient temperatures were compared. Maggot development appeared to be a major factor in the overall rate of decomposition and was affected primarily by different temperature patterns at the two sites. The authors conclude that ambient air temperatures are extremely important in carrion decomposition, primarily through the activities of calliphorid larvae. 15 references, 3 tables, and 4 figures