Formosan Entomologist (2001) 21, 269-286

Mei-Hwa Kuo, Yi-Chun Lin and Yu-Chang Liu (2001)
[Effects of temperatures on population parameters of polymorphic forms of Periphyllus koelreuteriae (Takahashi) (Homoptera: Chaitophoridae)]
Formosan Entomologist 21 (3), 269-286
Abstract: Effects of temperatures on population parameters of polymorphic forms of the goldenrain tree aphid, Periphyllus koelreuteriae (Takahashi), were studied from 5 to 30°C at 5 degree intervals. It was found that this species can not survive at 30°C. The fundatrix and the aestivating form can survive only at 15 to 20°C and 20 to 25 C, respectively. The stage frequency distribution of all forms overlapped between stages, and the age frequency distribution of adults on the viviparous form and the sexual form was always wider than that of nymphs. The distribution of age frequency of the egg stage was the widest among all stages for the fundatrix, and that of the first nymphal stages was the widest for the aestivating form. Age-specific survivorship (l_x) extended as temperature decreased for polymorphic forms of the aphid. The peak of fecundity line (m_x) of the viviparous form was 6.28 offspring at 25°C, 1.1 offspring at 15°C of the sexual form, 6.67 offspring at 20 °C of the fundatrix, and 6.20 offspring at 25°C of the aestivating form. Peaks of age-stage specific reproductive values (R_ij) appeared at the beginning of the adult stage, with the highest daily reproduction of an average of 16.95 offspring/female for the viviparous form on the 15th day at 20°C and 16.32 offspring/female on the 12th day at 25°C. The sexual form peaks of R_ij were 2.44 and 1.32 offspring/female on the 20th and 14th days, respectively, and the peak, was 3.78 offspring/female at 15°C . The longest age-specific expectation of life (E_x), of 99 days, was found at 5°C for the viviparous form while the shortest was 29 days at 25°C; and the longest E_x was 59 days for the sexual form at 10°C , and the shortest was 19 days at 25°C. The population of the viviparous form experienced positive growth from 5 C to 25 °C; the earlier the reproductive period begin, the bigger was the intrinsic rate of increase (r) and greater was the number of offspring. The population of the sexual form experienced positive growth only at 15°C, with negative growth at other temperatures of from 5 to 25°C . Both populations of the fundatrix and the aestivating form experienced positive growth in their survival range. The mean generation time (T) of all forms was gradually reduced with increasing temperature, with the longest T of 85.20 days at 15°C for the fundatrix and the shortest of 14.85 days for the viviparous form. The mean generation time (T) and the intrinsic rate of increase (r) were negatively correlated (r = -0.97026, P = 0.0061).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Mei Hwa Kuo

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Periphyllus koelreuteriae