Debugging Decomposition Data—Comparative Taphonomic Studies and the Influence of Insects and Carcass Size on Decomposition Rate

Abstract:  Comparison of data from a variety of environments and ambient temperatures has previously been difficult as few studies used standardized measures of time/temperature and decomposition. In this paper, data from previous studies and recent experiments are compared using simple conversions. These conversions allow comparison across multiple environments and experiments for the first time. Plotting decomposition score against logADD allows the exponential progression of decomposition to be expressed as a simple linear equation. Data comparison from many environments and temperatures shows no difference in decomposition progression when measured using Accumulated Degree Days. The major effector of change in rate was insect presence, regardless of depositional environment, species, or season. Body size is significant when carcasses are accessed by insects; when insects are excluded, while bodies are indoors, submerged, or buried, then decomposition progresses at the same rate regardless of body size.     

The Effect of Clothing on the Rate of Decomposition and Diptera Colonization on Sus scrofa Carcasses

Twenty Sus scrofa carcasses were used to study the effect the presence of clothing had on decomposition rate and colonization locations of Diptera species; 10 unclothed control carcasses were compared to 10 clothed experimental carcasses over 58 days. Data collection occurred at regular accumulated degree day intervals; the level of decomposition as Total Body Score (TBS_surf), pattern of decomposition, and Diptera present was documented. Results indicated a statistically significant difference in the rate of decomposition, (t₄₂₇ = 2.59, p = 0.010), with unclothed carcasses decomposing faster than clothed carcasses. However, the overall decomposition rates from each carcass group are too similar to separate when applying a 95% CI, which means that, although statistically significant, from a practical forensic point of view they are not sufficiently dissimilar as to warrant the application of different formulae to estimate the postmortem interval. Further results demonstrated clothing provided blow flies with additional colonization locations.     

Eisenhower's disarmament dilemma: From chance for peace to open skies proposal

President Eisenhower's image as a promoter of ‘peace and nuclear disarmament’ was established through speeches he made such as ‘Atoms for Peace’ (December 1953) and ‘Open Skies’ proposal (July 1955). However, Eisenhower's approach to the subject cannot be grasped without an understanding of his attitude towards the relationship between arms, war and disarmament. As he saw it, not only would the mere existence of nuclear weapons not trigger a war, they were actually the best guarantee against the eruption of a global conflagration. The real threat to world security was the repressive, closed, totalitarian and expansionist Soviet regime. War could be prevented only by a dramatic change in the competing ‐ and threatening ‐ ideology and social structure embedded in the Soviet system. Until then, the existence of nuclear weapons would ensure the free world's safety.     

Lessons from empirical research on policing in Israel: policing terrorism and police–community relationships

This article reviews recent empirical research on policing terrorism and police–community relationships in Israel, for the purpose of drawing lessons for policing in Israel and other democratic societies. The studies in the first section reveal the implications of policing terrorism for crime control and police–community relationships. In the second section, studies show a long-term drop in public support for the police. They also address the implementation of community policing, the relationship between the Israel National Police and the Arab sector, and the importance of procedural justice to Israeli citizens. In our discussion, we take a broad perspective and suggest overall conclusions and implications.     

Quantifying the Temperature of Maggot Masses and its Relationship to Decomposition

Numerous Calliphoridae species have been observed to form larval aggregations during the feeding stage of development, resulting in localized increases in temperature. This study investigates the relationship between maggot numbers in a mass and heat generation. Single‐species aggregations (Lucilia sericata) of various sizes (50–2500 individuals) were reared in the laboratory at a constant ambient temperature of 22°C. Internal mass temperatures were recorded every 5 min throughout the feeding stage of development. Results showed that mass temperatures increased with mass numbers (p‐value < 0.001), ranging from 2.5 to 14°C above ambient. A minimum mass size of 1200 produced overall temperatures that were significantly warmer than ambient, diverging away from 22°C after c. 26 h. These results indicate that the microclimate of a mass has the potential to differ significantly from ambient, which may be influencing larval development rates and should therefore be factored into mPMI estimates to increase accuracy.