Further advances toward a model of gypsy moth (Lymantria dispar (L.)) egg phenology; respiration rates and thermal responsiveness during diapause, and age-dependent developmental rates in postdiapause
1995
Gray, D.R. | Ravlin, F.W. | Regniere, J. | Logan, J.A.
Measurements of respiration rates were used to support a three-phase model of gypsy moth egg development. Respiration rate was measured on individual eggs that had been reared for 0-155 days at 5 degrees C following diapause initiation. Diapause termination was indicated by the dramatic increase in respiration rate that began approximately 95-125 days after diapause initiation. Respiration rates at 25 degrees C increased each day by approximately 0.0054 microliters CO2/24 h during diapause. After diapause termination respiration rates increased each day approximately 0.1379 microliters CO2/24 h. Eggs were equally responsive to temperature changes during diapause and postdiapause. A 10 degrees C increase in temperature resulted in a 2-fold increase in respiration rate. Developmental rates in postdiapause were found to be age- and temperature-dependent. The initial developmental rate parameters and a temperature-dependent rate change parameter were estimated empirically and a composite function was derived to describe the age- and temperature-dependent behavior of the developmental rate response. Modeled rates increased from 0.0 and 0.078 day-1 at postdiapause initiation to 0.01 and 0.20 day-1 at physiological age 0.95, at 5 and 30 degrees C respectively.
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