Biology Review for Final

auroradye's version from 2016-04-24 00:03

week 12, slides 24 Forensic and medical entomology

Question Answer
What is Forensic Entomology?study of insect biology as it legally relates to societal problems
What do you typically think of when you hear Forensic entomology?TOD (Time of Death), was corpse moved?
Other types of entomology?Structural entomology, stored product entomology, occupational hazards involving insects, veterinary entomology, wildlife entomology. Medico-legal entomology
What do you need to be a good forensic entomologist?need to have broad, extensive knowledge of insects including Anatomy, physiology, morphology, taxonomy, ecology, life cycles. This is because any insect can be useful in an investigation requiring legal intervention. Forensic entomologists are entomologists first, forensic specialists second.
Reasons why entomological testimony has become admissible in criminal recently in the US ?Insects are painfully objective. They are more reliable than witnesses. Decompositional changes > 48 hours. Other evidence lacking a scientific basis.
Forensic Entomology History - who described it first, in which work, what was the story?described by Sung Tz’u. China 1235. “The Washing Away of Wrongs” - a mystery of a slain villager. They used insects to solve the trial, to see whose syth (the bloody murder weapon) they moved towards.
Types of cases in forensic entomology?Sudden Death; Automobile Accident; Neglect (myiasis); Agents of Murder; Drug Transport, Use, OD; Suspicious deaths
Why use Insects in Medico-Criminal Cases? 2 reasons1. Insects are usually first to a corpse 2. Insects around/in a corpse change in a stereotypical succession
What happens to a body at death?Cells die and enzymes digest. Gastrointestinal bacteria destroy soft tissue. Releases H2S, CO2, CH4, NH3, SO2. Attract insects
5 Stages of Decomposition (name, duration)1. Fresh stage (0-2 days) 2. Bloated stage (2-7 days) 3. Decay stage (5-13 days) 4. Post-decay stage (10-23 days) 5. Remains stage (18-90+ days)
When is the Fresh stage?0-2 days
When is the Bloated stage?2-7 days
When is the Decay stage?5-13 days
When is the Post-decay stage?10-23 days
When is the Remains stage?18-90+ days
What are some of the insect ecological roles? (4)1. Necrophages 2. Omnivores 3. Parasites/Predators 4. Incidentals
What are Necrophage insects?eat dead or decaying animal flesh
What are Omnivore insects?eat food from both plants and animals, which may include eggs, insects, fungi and algae
What are Parasite/Predator insects?lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense
What are Incidental insects?generally don’t affect plant health but occasionally cause concern or become a nuisance, like pill bugs, lovebugs, craneflies, etc