Ento 2010 Week 13 Notes
Ento 2010 Week 13 Notes ENTO 2010
Popular in Insects & the Environment
Popular in Entomology
This 5 page Class Notes was uploaded by Caitlin Conner on Friday April 15, 2016. The Class Notes belongs to ENTO 2010 at University of Georgia taught by Espelie in Spring 2016. Since its upload, it has received 20 views. For similar materials see Insects & the Environment in Entomology at University of Georgia.
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Date Created: 04/15/16
Ento 2010 Week 13 Notes April 11, 2016 o Forensic entomology : study of insects from a legal aspect o Insects as forensic indicators: Estimate postmortem interval Assess death scene Corpse transport/relocation Injury prior to death Drug testing o Estimate postmortem interval Based on Blow Fly development Most accurate in the first 30 days Several Blow Fly species involved o Blow Flies are the first to arrive at a corpse Eggs are laid Larvae develop Development is temperature dependent Succession of insects is predictable o Basic assumptions in homicide investigation Murder took place at night Flies oviposit as soon as they find a body Predictable succession Weather station records valid Air temperature determines fly development o Forensic entomologist: Recovers insects from the body Identifies insects o Maggot mass : large group of blow fly larvae in carrion Maintain high temperature o Decomposition studies Test animal is sacrificed Environmental conditions recorded Succession of insects monitored o Variations: Body buried Body in water Body burned Body in building o Body farm University of Tennessee Use human bodies o Corpse relocation: Few insects in soil beneath body Insects from body are “foreign” o Forensic entomology Other aspects: Drug analysis of corpse Insects in food Poaching o Case study: Oregon Rifle fired at party Neighbor killed Body found 1 month later Insect evidence set time of death o Case study: Young child brought to hospital Suffered from abuse and neglect Difficult to prosecute parents Anal and genital areas had fly maggots Larval age=5 days Diapers had not been changed for 5 days Similar example with elderly patients o Case Study: Chicago Woman raped by man in ski mask Suspect had a mask in apartment Suspect: “mask had not been worn” Burrs in mask (and at crime scene) Small caterpillars in burrs Life cycle of moth: eggs are laid in summer Mask had been outside in last 6 months! April 13, 2016 o Ticks & mites Class: Arachnida Subclass: Acari Species=30,000 o Ticks and mites 2 main body parts: cephalothorax & abdomen -no division between usually 8 legs egg-larva-nymph-adult ticks parasitize: mammals, birds, reptiles mites are: free living, plant/animal parasites o Lyme Disease Described first in Connecticut Vector: deer tick Disease agent is a bacterium: Borrelia 15,000 cases per year in U.S. most prevalent in northeast o Lyme disease: Ticks feed on infected mice Bacteria multiply in tick vector Ticks feed on man Circular rash Flu-like illness Later: arthritis, heart, and nerve problems Treatment: antibiotics o Deer tick Much smaller than dog tick Nymph is the usual vector (1/3 infected) Life cycle: Year 1: larvae hatch, feed, and molt Year 2: nymphs feed; adults emerge and feed Birds disperse ticks o Lyme disease: Cause is unknown May attack nervous system, heart, or joints May cause an immune response to self Patient response is very variable o Lyme disease prevention Protective clothing in woods Check your body for ticks Save ticks that you remove o Tick removal: Use fine-pointed tweezers Grasp tick where it enters skin Pull tick out slowly and firmly Save the tick o Rocky Mountain Spotted Fever Vector: dog tick Disease agent is a bacterium: Rickettsia 800 cases per year in U.S. most prevalent in the west o Scorpions Class: Arachnida Subclass: Scorpiones Species: 1,200 o Scorpions: 2 large pincers tail with venom predators North African and Middle Eastern species can kill a human Can survive extreme temperatures Are blind; use feelers on legs to find prey Male deposits sperm on stalk-then pulls female over stalk Female bears live young and cares for them April 15, 2016 o Spiders Class: Archanida Subclass: Araneae Species=30,000 o Spiders: Cephalothorax jointed to abdomen by pedicel 8 legs most produce silk most produce venom males deliver sperm with palps very few cause harm to humans o Spider diversity Sun spider Trapdoor spider Whirling spider Net-casting spider Bolas spider Ball with mucous Moth sex pheromone Mexican tarantula Bird eating spider Purse-web spider Camouflaged web o Tarantulas Covered with hairs Can throw hairs at predators Hairs are barbed and toxic o Large-jawed spider: Male produces sperm in abdomen and transfers it to a special web & then to the palps on his cephalothorax o Jumping spider: Male attracts female with mating dance where he puts her in “a trance” with front leg movements o Net-casting spider: Male “talks” to female by strumming on web Male uses palps to deliver sperm to female Female mates once and stores sperm Male may mate many times o St. Andrew’s Cross Spider: Female is much larger than male Male “plucks” on web to identify himself He risks death in order to mate o Orb weaver: Stabilimentum: zig zag cross strands in web Warns birds so they won’t fly into web Some birds may use stabilimentum to find silk for their nest
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