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Related Experiment Videos

[Decrease of supercooling capacity during embryogenesis and larval growth in Coleoptera]

P Vernon1, G Vannier, J M Luce

  • 1UMR 6553 CNRS, université de Rennes-I, Paimpont, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|May 1, 1997
PubMed
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Osmoderma eremita eggs and larvae are freezing intolerant, with supercooling points (SCP) dropping significantly as they develop. However, larvae become freezing tolerant before overwintering, surviving ice formation.

Area of Science:

  • Entomology
  • Insect Physiology
  • Cold Hardiness Research

Background:

  • Osmoderma eremita (European noble chafer) is a beetle species facing potential cold stress.
  • Understanding insect cold tolerance is crucial for predicting species survival and distribution.

Purpose of the Study:

  • To assess the cold resistance of Osmoderma eremita eggs and larvae during development.
  • To determine the supercooling points (SCP) and water content changes in different life stages.

Main Methods:

  • Supercooling points (SCP) were measured for sterile eggs, fertilized eggs (newly laid and pre-hatch), and first instar larvae.
  • Water content and fresh weight were analyzed at different developmental stages.

Main Results:

Related Experiment Videos

  • Fertilized eggs absorbed water, increasing weight and water content, with SCP rising closer to hatching (-9.2°C).
  • Newly hatched larvae showed similar SCP (-10.1°C) but higher water content; feeding larvae had reduced supercooling ability (SCP = -5.7°C).
  • All larvae became freezing tolerant before overwintering, with SCP around -5°C, though mortality occurred below -12°C.

Conclusions:

  • Osmoderma eremita eggs and early larvae are freezing intolerant.
  • A developmental shift to freezing tolerance occurs before overwintering, enabling survival at sub-zero temperatures.
  • The species exhibits distinct physiological adaptations to cold during its life cycle.