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RELATIONSHIP BETWEEN PTERIN ACCUMULATION AND OVARIAN DEVELOPMENT IN THE STABLE FLY STOMOXYS CALCITRANS (L.) (DIPTERA: MUSCIDAE)1

Published online by Cambridge University Press:  31 May 2012

T.J. Lysyk  and
E.S. Krafsur
T.J. Lysyk
Affiliation:
Agriculture Canada Research Station, PO Box 3000, Main, Lethbridge, Alberta, Canada T1J 4B1
E.S. Krafsur
Affiliation:
Department of Entomology, Iowa State University, Ames, Iowa, USA 50011
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Abstract

Pterin accumulation in response to temperature and time was studied in male and female stable flies Stomoxys calcitrans (L.). Pterins accumulated as a function of temperature integrated over time. The threshold for pterin accumulation was estimated at 6.5 °C. The relationship between pterin content (RF/mm head capsule width) and accumulated degree-days above 6.5 °C (DD6.5) was determined to be RF/mm = 38,06 + 1.258*DD6.5 for females and RF/mm = 37.65 + 1.765*DD6.5 for males. Ovarian development, measured by follicle length and degree of vitellogenesis, was also related to DD6.5 and pterin concentration. The relationship between y1 = follicle length (mm) and x = DD6.5/200 was y1 = 0.11 + 0.78* [1−exp(− 18.34*x)]**99.86 and between vitellogenic stage (y2) and x was y2 = 0.04 + 3.96*[1−exp(− 11.48*x)]**6.67. Stable flies had a temperature threshold of 8 °C for oviposition.

Résumé

L’accumulation de ptérine en fonction de la température et du temps a été étudiée chez des mâles et des femelles de la Mouche piquante des étables, Stomoxys calcitrans (L.). L’accumulation des ptérines représente une fonction directe du produit température-temps. La température seuil sous laquelle il ne se fait pas d’accumulation de ptérine a été évaluée à 6,5 °C. La relation entre la concentration de ptérines (RF/mm de largeur de capsule céphalique) et le nombre de degrés-jours au-dessus de 6,5 °C (DD6.5 a été évaluée : RF/mm = 38,06 + 1,258**DD6.5 dans le cas des femelles et RF/mm = 37,65 + 1,765*DD6.5 dans le cas des mâles. Le développement ovarien, mesuré en fonction de la longueur des follicules et du stade d’avancement de la vitellogenèse, est également relié à DD6.5 et à la concentration de ptérine. La relation entre y1 = longueur folliculaire (mm) et x = DD6.5/200 a été évaluée ainsi : y1 = 0,11 + 0,78* [1−exp(− 18,34*x)]**99,86 et la relation entre le stade d’avancement de la vitellogenèse (y2) et x, y2 = 0,04 + 3.96*[1−exp(− 11,48*x)]**6,67. Chez ces mouches, le seuil de température de la ponte a été estimé à 8 °C.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 5 , October 1993 , pp. 869 - 879
Copyright
Copyright © Entomological Society of Canada 1993

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