Algal Colonization of Submerged Carcasses in a Mid-Order Woodland Stream

    Volume 45, Issue 6 (November 2000)

    ISSN: 0022-1198


    Page Count: 6

    Casamatta, DA
    Ohio University, Athens, Ohio

    Verb, RG
    Ohio University, Athens, Ohio

    (Received 13 January 2000; accepted 14 January 2000)


    One of the primary goals of forensic pathology is the determination of time of death. In aquatic systems, one method to do this is to analyze the colonization of a corpse by algae. Algal communities typically follow a serial colonization pattern, therefore the taxa present at any given time may provide clues about post-mortem submersion time. This study was undertaken to examine the algal colonization on rat carcasses in a medium-order woodland stream. Two habitats were studied: a low flow pool and a high flow riffle, with rats being removed from each site every 3 to 6 days over 31 days. The diversity of colonizing taxa increased at both sites as the study progressed, and after 17 days similar taxa were present (Sorensen's similarity index >60%) in each site. Some taxa, such as desmids (Chlorophyta), tended to increase in diversity throughout the study, making them possible indicators of submersion time. Diatoms were the most abundant taxa found in each site and accounted for 63 of the 92 total taxa identified. Due to their ubiquitous presence in nearly all streams, we suggest that diatoms may be the key organisms for the study of postmortem submersion in lotic systems.

    Paper ID: JFS14880J

    DOI: 10.1520/JFS14880J

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    Title Algal Colonization of Submerged Carcasses in a Mid-Order Woodland Stream
    Symposium , 0000-00-00
    Committee E30