Lec26_DefenseBehav

Lec26_DefenseBehav - The beetle discharges a hot quinone...

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Insect Defensive Systems Insect Defenses Behavioral Defense Structural or Mechanical Defense Chemical Defense Colorational Defense Behavioral Defenses •f lee • reflexive dropping • remaining motionless • death feigning
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Structural or Mechanical Defenses • Heavy sclerotization • Body modification –spins, spurs, hairs • Autotomy (shedding body parts) • Building protective shelters Chemical Defenses • non-venomous –irritants (reflexive bleeding, enteric discharges) –repugnatorial substances –sequestered toxins • venoms –urticating hairs –stings Chemical Defense of the Bombardier Beetle
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Unformatted text preview: The beetle discharges a hot quinone secretion as a defense. The components are produced in special glands (G) and stored in a reservoir (R) until mixing. + H2O G R Reaction Chamber Coloration Defenses Cryptic coloration disruptive coloration counter-shading Flash coloration Aposematic or warning coloration Mimicry Mimicry Batesian - a palatable species which mimics an unpalatable species Mullerian - a type of mimicry in which two or more unpalatable species appear similar Wasmannian - mimicry whereby inquilines resemble their host (primarily ants)...
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Lec26_DefenseBehav - The beetle discharges a hot quinone...

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