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Outdoor human decomposition in Sweden: A retrospective quantitative study of forensic-taphonomic changes and postmortem interval in terrestrial and aquatic settings
Linnaeus University, Faculty of Arts and Humanities, Department of Cultural Sciences.ORCID iD: 0000-0002-0181-4458
National Board of Forensic Medicine, Sweden.ORCID iD: 0000-0001-7003-6488
2021 (English)In: Journal of Forensic Sciences, ISSN 0022-1198, E-ISSN 1556-4029, Vol. 66, no 4, p. 1348-1363Article in journal (Refereed) Published
Abstract [en]

This paper presents a quantitative retrospective study of gross human decomposition in central and southeastern Sweden. The applicability of methods developed abroad for postmortem interval (PMI) estimation from decomposition morphology and temperature are is evaluated. Ninety‐four cases were analyzed (43 terrestrial and 51 aquatic) with a median PMI of 48 days. The results revealed differences in decomposition patterns between aquatic, surface, hanging, and buried remains. While partial saponification and desiccation occurred in cases of surface remains, complete skeletonization was observed in all cases with a PMI over two years. Aquatic skeletonization was slower due to extensive saponification in cases with PMI higher than one year. Formulae for assessing accumulated degree‐days (ADD) from the original methods did not fit the study material. However, a regression analysis demonstrated that 80% of decomposition variance in surface remains could be explained by ADD, suggesting that a geographically adapted equation holds promise for assessing PMI. In contrast, the model fit was poor for aquatic cases (43%). While this may be explained by problems in obtaining reliant aquatic temperature data or an insufficient scoring system, aquatic decomposition may be highly dependent on factors other than ADD alone. This study evaluates the applicability of current PMI methods on an outdoor sample from a previously unpublished region, and represents the first scientific publication of human outdoor decomposition patterns in Sweden. Suggestions for future research are provided, including that scoring methods should incorporate saponification to fit forensic taphonomy in Swedish environments.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 66, no 4, p. 1348-1363
Keywords [en]
forensic anthropology, postmortem interval, forensic taphonomy: Sweden, aquatic decomposition, terrestrial decomposition
National Category
Forensic Science
Identifiers
URN: urn:nbn:se:lnu:diva-102383DOI: 10.1111/1556-4029.14719ISI: 000647185800001PubMedID: 33951184Scopus ID: 2-s2.0-85105646310Local ID: 2021OAI: oai:DiVA.org:lnu-102383DiVA, id: diva2:1546356
Available from: 2021-04-21 Created: 2021-04-21 Last updated: 2022-07-12Bibliographically approved
In thesis
1. The Corporeality of Death: Bioarchaeological, Taphonomic, and Forensic Anthropological Studies of Human Remains
Open this publication in new window or tab >>The Corporeality of Death: Bioarchaeological, Taphonomic, and Forensic Anthropological Studies of Human Remains
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Dödens kroppslighet : osteoarkeologiska, tafonomiska och forensisk-antropologiska studier av mänskliga kvarlevor
Abstract [en]

The aim of this work is to advance the knowledge of peri- and postmortem corporeal circumstances in relation to human remains contexts, as well as to demonstrate the value of that knowledge in forensic and archaeological practice and research. This article-based dissertation encompasses papers in bioarchaeology and forensic anthropology, with an emphasis on taphonomy. The studies include analyses of human osseous material and human decomposition in relation to spatial and social contexts, from both theoretical and methodological perspectives.

Taphonomic knowledge is vital to interpretations of the circumstances of peri- and postmortem deposition, with a concern for whether features were created by human hand or the result of decomposition processes and other factors. For example, taphonomic knowledge can aid interpretations of the peri- and postmortem sequence of events, of the agents that have affected human remains, as well as for estimations of time since death. When integrated with social theories, taphonomic information can be used to interpret past events. 

In this dissertation, a combination of bioarchaeological and forensic taphonomic methods are used to address the question of what processes have shaped mortuary contexts. Specifically, these questions are raised in relation to the peri- and postmortem circumstances of the dead in the Iron Age ringfort of Sandby borg, and about the rate and progress of human decomposition in a Swedish outdoor environment and in a coffin. Additionally, the question is raised of how taphonomic knowledge can inform interpretations of mortuary contexts, and of the current state and potential developments of forensic anthropology and archaeology in Sweden. 

The result provides us with information of depositional history in terms of events that created and modified deposits of human remains. Furthermore, this research highlights some limitations in taphonomic reconstructions. The research presented here is helpful for interpretations of what has occurred in the distant as well as recent pasts, to understand potentially confounding factors, and how forensic anthropology can benefit Swedish crime scene investigations. In so doing, the knowledge of peri- and postmortem corporeal circumstances and how it can be used has been advanced in relation to both the archaeological and forensic fields.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2021. p. 93
Series
Linnaeus University Dissertations ; 413/2021
Keywords
Taphonomy; mortuary archaeology; bioarchaeology; forensic anthropology; forensic archaeology; Sandby borg; human decomposition; crime scene investigation; archaeothanatology
National Category
Archaeology
Research subject
Humanities, Archaeology
Identifiers
urn:nbn:se:lnu:diva-102468 (URN)9789189283701 (ISBN)9789189283718 (ISBN)
Public defence
2021-05-24, MA135, Hus Magna, Kalmar, 14:15 (English)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2021-04-28 Created: 2021-04-28 Last updated: 2024-02-29Bibliographically approved

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Alfsdotter, Clara

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