Canadian Forest Service Publications

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.; Régnière, J.; Logan, J.A. Journal of Insect Physiology 41(3): 247-256.

Year: 1995

Issued by: Laurentian Forestry Centre

Catalog ID: 16930

Language: English

Availability: PDF (request by e-mail)

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Abstract

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°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°C increased each day by approximately 0.0054 µl CO₂/24 h during diapause. After diapause termination respiration rates increased each day approximately 0.1379 µl CO₂/24 h. Eggs were equally responsive to temperature changes during diapause and postdiapause. A 10°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°C respectively.