Human Decomposition in an Insect-Restricted Environment
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University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Masters Theses Graduate School 12-2003 Death as a process : human decomposition in an insect-restricted environment Kimberly Dawn Tomlinson Follow this and additional works at: https://trace.tennessee.edu/utk_gradthes Recommended Citation Tomlinson, Kimberly Dawn, "Death as a process : human decomposition in an insect-restricted environment. " Master's Thesis, University of Tennessee, 2003. https://trace.tennessee.edu/utk_gradthes/5308 This Thesis is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Masters Theses by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a thesis written by Kimberly Dawn Tomlinson entitled "Death as a process : human decomposition in an insect-restricted environment." I have examined the final electronic copy of this thesis for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Master of Arts, with a major in Anthropology. Murray Marks, Major Professor We have read this thesis and recommend its acceptance: Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) To the Graduate Council: I am submitting herewith a thesis writtenby Kimberly Dawn Tomlinson entitled "Death as a Process: Human Decomposition in an Insect-Restricted Environment." I have examined the final paper copy of this thesis forform and content and recommend that it be accepted in partial fulfillment of the requirements forthe degreeof Master of Arts, witha major in Anthropology. We have rea<:ithis thesis and recommend its acceptance: Acceptance forthe Council: �a* Vice Prov:::; Graduate Studies Death as a Process: Human Decomposition in an Insect-Restricted Environment A Thesis Presented for-the Master of Arts Degree The University of Tennessee, Knoxville Kimberly Dawn Tomlinson December 2003 tli::sis 2/&, ,76'! Copyright © 2003 by Kimberly DawnTomlinson All rights reserved. Insect-Restricted Environmentfor Human Decomposition 5-3 1-02 Copyright © 2003 by Kimberly DawnTomlinson Allrights reserved. ii Dedication To thosewho give so graciouslyofthemselves--even in death 111 Acknowledgements I would like to take this opportunity to thank those who contributed to this endeavor. Thanks to Dr. Murray Marks is in order forgiving me the confidence to take my research to the next level. Also, I would like to thank Dr. Lee Meadows Jantz for contributing to my determination to "make it work," and Dr. Walter Klippel forhis patient ear and entomological advice. Specialthanks are attributed to Dr. WilliamM. Bass for his sincere faith, enthusiasm, and supportfor my research from beginning to end. In addition to faculty mentors, I would also like to recognize a few "student" mentors. Specialthanks goes to AngiChristensen, Michelle Hamilton, and Jennifer Synstelien for their academic advice and to Nancy Anderson for her professional advice, as well as emotional support. I would also like to acknowledge the support I received while affiliated with the Facility. The WilliamM. Bass Endowment provided funding for the construction of the insect-restricted environment. Graduate students involved with the transport and handling of donations included: Jaime Stuart,Jennifer Synstelien, Beth Bassett,Kate Spradley, Jamie McCuiston,Michelle Miller, and Mariateresa Tersigni. Thanks for treating my "guys" with such gentleness. I would also like to recognize Erin Eldridge for her botanical expertise andthank Carrie Srnka for keeping me company while I worked. Further acknowledgments are in order for the morgue staff. Thanks for enduring the 4 :30 wake-up calls! Also, I would like to recognize the urMedical Center Police for making sure I wasokay in the dark. IV Last, but certainly not least,I would like to extendmy greatestappreciation to my family: Thanks Mother for always believing in me, even when my goals seemed unobtainable. ThanksDaddy forshowing your love for''your little girl" by helping me makemy blue-prints a reality. And to my beloved Jay Sikes, thanks fornever doubting me and forinspiring me to "adapt and overcome." V Abstract Many view death as an event; however, the death investigator must perceivedeath as a process that is catalyzed by cellular breakdownand ultimately results in skeletal remains. Yet, a gap persistsin the· understanding of the causal events inherent to the human decompositionprocess. In order to gain a clearer understandingof these causal events, research must focuson internalfactors of decomposition,specifically autolysis and putrefaction. However, in order to observethe contributionof autolysis and putrefactionto the processof human decomposition,external factors proven to grossly manipulate these effects,as perceivedby the senses, must be limited. One such external factoris insectactivity. While gathering data forsuccessional analysisof insects affiliatedwith the decompositionof the baby pig, Susscrofa Linnaeus,Payne ( 1965) denied insect access to a separate groupof pigs. Observing that the decompositionof this groupdiffered from the groupexposed to insects, Payne designatedan alternativenomenclature forthe stages of decompositionspecific to the unexposedpigs. To determineif this nomenclaturecould be applied to humansin a similarsetting, an insect-restrictedenvironment was constructedat the AnthropologyResearch Facility in Knoxville,Tennessee. Four unembalmed, unautopsied humandonations were involved in the study. As two members of the controlgroup were allowed fullexposure to the elements, two members of the experimentalgroup were placed inside the structure specificallyto monitor autolysisand putrefaction influencedonly by environmental conditions and insects thatcrossed the barrier. Data collection involved observationsof V1 the visual and olfactorycues of human decompositionand notations of insects attracted to each subject, including those attemptingto cross the constructed barrier. Environmentaldata (i.e., temperature, humidity, rainfall, sky conditions) was collected in the vicinityof each donation,with specialattention attributed to temperatureand humiditydata collectionmethods. In order to contemplate each progression,all data specilicto each subjectwas articulatedwithin the contextof the circumstances surrounding each donation. Hence, Bass's (1997) nomenclaturerepresentative of decompositionin a natural and uncontrolledenvironment served as the default forall subjects, while Payne's (1965) nomenclaturespecific to insect-free pigs was considered when addressing the progressionof the experimentalgroup. While the interpretations of the decompositionand insect activitydata and the environmentaldata collection methods were supportedby the literature, the ultimategoal was to access the causal events affiliatedwith internaldecomposition. Although the results of this studyindicated that the controlgroup members followedBass's (1997) nomenclature while the experimentalgroup progressedaccording to Payne's (1965) nomenclature, bothprogressions revealed generalizedsequential patterns of causal events attributed to autolysis and putrefaction. Such events involving initial indications of generalized skin discoloration,marbling, skin slippage, hair slippage, the purging of fluids, and odor occurredprior to and continued throughoutbloating, while dehydration and skeletoniz.ationwere noted upondeflation and beyond. Adipocereformation, desiccation, and the proliferation of fungiand/or mold were variable. In addition, these patternedevents were influenced by temperature, humidity, rainfall, and sky conditions, which consequentlyaffected the rate of decomposition. vu Research contributions inherentto thisstudy include supportfor regional models basedon patterns of causal events. Contributionsto the death scene investigation involve the recognitionof both the visual/olfactorysignatures attributed to decomposition and natural versus disrupted insect successional patterns, coupled with suggestions forproper environmental datacollection methods. Vlll Table of Contents' Chapter Page 1. Introduction. ................................................... 1 Internal Factors of Human Decomposition: Autolysis and Putrefaction....... 2 Visual and OlfactoryCues Indicative of Human Decomposition......... · ... 3 Progressive Alternativesto Putrefaction............................... 6 Stages of HumanDecomposition ..................................... 7 ExternalFactors that Affectthe Rate of Human Decomposition............. 8 Insects as an Environmental Variable ...........................10 Insects as a SituationalFactor .................................15 Human Decompositionin an Insect-Restricted Environment............... 18 Fulfilling the Role of Death Investigatorin a Legal Setting................ 19 2. Materials and Methods . ..........................................21 Insect-Restricted Environment. ..................................... 21 Human Donations........... ..................................... 25 Documentationof Decomposition................................... 28 Documentationof Insect Activity ..........................· ..........32 Documentationof Environmental Variables ............................33 Temperatureand Humidity............... · ...................