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Quantifying dispersal of bark beetles and their predators

Quantifying dispersal of bark beetles and their predators. Arnaud COSTA Laboratory of Insect Ecology, Southern Illinois University, Carbondale, Illinois. 1 - Introduction: gap formation in red pine forests.  potential interactions between below and above ground herbivory.

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Quantifying dispersal of bark beetles and their predators

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  1. Quantifying dispersal of bark beetles and their predators Arnaud COSTA Laboratory of Insect Ecology, Southern Illinois University, Carbondale, Illinois

  2. 1 - Introduction: gap formation in red pine forests  potential interactions between below and above ground herbivory - interactions could be approached by measuring dispersal of each guild member - predators limit the expansion of such declining stands by reducing Ips numbers - Dendroctonus valens (root colonizer) - Ips pini (stem colonizer) - Thanasimus dubius (predator)

  3. 1 - Introduction: gap formation in red pine forests T. dubius (Cleridae) D. valens (Scolytidae) I. pini (Scolytidae)

  4. 2 - Objectives of the project - T. dubius (predator) - D. valens (bark beetle, root) Main objective: to measure dispersal of three insects associated to red pine stands decline - I. pini (bark beetle) - on the same geographical area (Wisconsin) - using the same methods (mark recapture)

  5. 2 - Objectives of the project • - differences of dispersal related to • sex • size • (Cronin et al., 2000) - how far do these insects fly? *Dispersal quantile: percentage of beetles dispersing at a particular distance  a study of predator-prey movement examined for the first time on the same geographical scale

  6. 3 - Field sites Mirror Lake Kettle Moraine Spring Green

  7. 4 - Methods Mark recapture - T. dubius and D. valens caught are marked with a spot of paint on the pronotum - funnel traps baited with appropriate semiochemicals - I. pini will be marked with fluorescent powder while emerging from infested logs - insects will be released at the center of a grid of traps

  8. 4 - Methods Semiochemicals / lures

  9. 4 - Methods - grid of traps (cross shape pattern) set at 50,100, 200, 300, 400, 500, 750, 1000, 1250, 1500, 1750 and 2000 m. Mark recapture grid

  10. 4 - Methods Mark recapture grid (including a pocket of decline)

  11. 5 – Expected schedule Timetable of mark recapture tasks Legend: ML = Mirror Lake, SG = Spring Green, KM = Kettle Moraine (*) depending on infestation success (**) only one attempt might take place

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