Immersing Corpses in Water 4/10/08. Overall Effects on Corpse Decomposition generally retarded Decomp begins in head region Skin of hands and feet Livor.

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Presentation transcript:

Immersing Corpses in Water 4/10/08

Overall Effects on Corpse Decomposition generally retarded Decomp begins in head region Skin of hands and feet Livor mortis may not appear Bloating

Overall Effects on Corpse Finger and toenails easily detachable Skeletonization

Faunal Associates Ectoparasites Fleas Body lice

Carrion Community Associates Pig carcass study by Payne Stage one: submerged fresh Bloat Aquatic Insects

Hydrophilid Beetles Coleoptera: Hydrophilidae Water scavenger beetles 284 species in North America 1-40 mm Long palpi Larvae predatory, adults scavengers

Hydropsychid Caddisflies Trycoptera: Hydropsychidae Water nymph 146 species in North America Adults 6-19 mm Larvae: streams and rivers Feed on algae, diatoms, crustaceans, insects

Chironomid Midges Diptera: Chironomidae Non-biting midtes 700 species 1-10 mm Resemble mosquitos Larvae aquatic

Simulidae Larvae Diptera: Simulidae Black flies Blood feeders Small, black/grey Larvae aquatic

Heptageniid Mayflies Ephemeroptera: Heptageniidae Mayflies 500 species Clear wings, prominent venation Nymps aquatic, flattened, streamlined

Carrion Community Associates Stage two: submerged fresh Early Floating Exposed abdomen: eggs Submerged portions still inhabited by organisms in stage one

Carrion Community Associates Stage three: Floating Decay Blowfly eggs hatch Oviposition ceased by Day 3 Coleoptera Silphids, Staphylinids, Histerids

Carrion Community Associates Stage four: Bloated Deterioration Many maggots, beetles Most tissues gone

Carrion Community Associates Stage five: Floating Remains Few maggots Histerid beetles Small flies: Sphaerocerids, Phorids, Drosophilids, Psychodids Stage ends when remains sink

Carrion Community Associates Stage six: Sunken Remains Decomp completed by bacteria and fungi

Postmortem Submersion Interval Make use of organisms which attach themselves to substrate Understand differences between moving and still water organisms no purely sarophagous aquatic insects

Ecological Function Food for invertebrates and fish Shelter Attract secondary scavengers Substrate for producers Substrate for grazers

Saltwater Submersion Fauna almost completely different from fresh water little studied Barnacles Shrimp, prawns, crabs

Any Questions?