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Developmental rate isomorphy in insects and mites.

Vojtech Jarosík1, Alois Honek, Anthony F G Dixon

  • 1Department of Zoology, Faculty of Sciences, Charles University, Vinicná 7, CZ 128 44 Prague 2, Czech Republic.

The American Naturalist
|August 19, 2008
PubMed
Summary

Rate isomorphy, where developmental stage duration is temperature-independent, is common in insects and mites. This finding suggests a shared lower developmental threshold across all life stages for these species.

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Area of Science:

  • Ecology
  • Developmental Biology
  • Entomology
  • Acarology

Background:

  • Rate isomorphy occurs when the proportion of total developmental time spent in a specific stage remains constant across temperatures.
  • This phenomenon is contingent on a uniform lower developmental threshold for all life stages.
  • Understanding rate isomorphy is crucial for predicting insect and mite population dynamics and thermal tolerance.

Purpose of the Study:

  • To determine the incidence of rate isomorphy in a diverse range of insect and mite species.
  • To investigate whether developmental stages share a common lower developmental threshold.
  • To explore the ecological and evolutionary implications of rate isomorphy.

Main Methods:

  • Assessed rate isomorphy by plotting the proportion of developmental time per stage against temperature for 7 mite species and 342 insect species/populations.

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  • Inferred rate isomorphy from a lack of change in the proportion of time spent in each stage across a linear temperature range.
  • Conducted a meta-analysis to corroborate findings on the prevalence of rate isomorphy.

    • Main Results:

    • Rate isomorphy was observed in 57% (243 of 426) of the studied populations.
    • Deviations from rate isomorphy were minor, averaging 0.2%, and often occurred at the temperature range extremes.
    • A meta-analysis confirmed the general prevalence of rate isomorphy across studies.

    Conclusions:

    • Insect and mite species commonly exhibit rate isomorphy, indicating a shared population-specific lower developmental threshold across all life stages.
    • Rate isomorphy has significant practical applications in pest management, life-history event timing, and assessing thermal requirements.
    • The prevalence of rate isomorphy may suggest a phylogenetic constraint in insect and mite development.