Abstract
Results obtained from the present study showed great variations in the body weight, water content, fat and glycogen reserves of hibernating and active adults ofEpilachna chrysomelina.
Beetles were active throughout May—September and entered hibernation from October to March/April. At the beginning of hibernation, beetles were generally heavier than active ones. They lost 26.3–36.5% of their body weight and 6.5% of their water content during the hibernation period.
Active beetles entered hibernation with high fat and glycogen reserves (13.3 and 1.4 mg/beetle). These gradually decreased to 4.2 and 0.12 mg/beetle throughout the 6 months of hibernation, an indication that beetles consumed about 44.6% and 90% of the total fat and glycogen reserves during this period.
Zusammenfassung
Zwischen aktiven und überwinternden Käfern vonepilachna chrysomelina bestanden erhebliche Unterschiede im Wasser-, Fett- und Glykogengehalt. Zu Beginn der Überwinterung, im Oktober, zeigten die Käfer ihr Maximalgewicht. Sie verloren 26,3 bis 36,5% ihres Körpergewichts und ca. 6,5% ihres Wassergehalts während der Winterruhe. Die Käfer begannen die Überwinterung mit hohen Fett- und Glykogenreserven (13,3 und 1,4 mg/Käfer). Diese reduzierten sich während der 6 Ruhemonate auf 4,2 und 0,12 mg/Käfer, d. h. die Käfer verbrauchten 44,6% ihrer Fett- und 90% ihrer Glykogenreserven.
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Ali, M.A., El-Saedy, A.H.A. Vergleichende Untersuchungen über die Reservestoffe überwinternder und nicht überwinternder Adulter des Melonenmarienkäfers, Epilachna chrysomelina (F.) (Col., Coccinellldae). Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 54, 5–8 (1981). https://doi.org/10.1007/BF01903969
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DOI: https://doi.org/10.1007/BF01903969