Type of Document Dissertation Author Gray, David Richard URN etd-02012006-141735 Title Gypsy moth egg development : a model of phenological events Degree PhD Department Entomology Advisory Committee
Advisor Name Title Logan, Jesse A. Committee Member McManus, M. L. Committee Member Mullins, Donald E. Committee Member Ravlin, Forrest W. Committee Member Stone, Nicholas D. Committee Member Keywords
- Gypsy moth eggs
Date of Defense 1994-01-05 Availability restricted AbstractA phenological model of gypsy moth egg development is proposed that distinguishes
three phases of egg development, prediapause, diapause and postdiapause. A technique
of measuring respiration rates of individual eggs was developed and respiration rate was
used as a physiological variable to distinguish the phases. The pattern of respiration rate
provided strong evidence in support of three distinct developmental phases. Respiration
rate developed embryos declined sharply as prediapause was entered and rose sharply
when diapause was completed. When the effect of age on respiration rate was removed,
temperature had a uniform effect on respiration rate throughout the egg stage. A 10°C
decrease in temperature caused an approximate 0.4 fold decrease in respiration rate,
indicating that eggs in diapause are as equally responsive to temperature as egg in a
Developmental rate in prediapause was strongly temperature-dependent, and the
relationship was described by a non-linear function. Prediapause duration was
approximately 13 days at 31°C. The depletion of stored triglycerides was strongly linked
to the completion of prediapause
Developmental rate in postdiapause was found to be temperature- and age dependent.
Developmental response to temperature was relatively weak and linear at the
onset of postdiapause. As postdiapause advanced, the response became stronger and
non-linear. The temperature- and age-dependent developmental response was fully
described by the temperature-dependent developmental response at the onset of
postdiapause, and by a temperature-dependent rate change parameter.
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