Eur. J. Entomol. 97 (3): 323-328, 2000 | DOI: 10.14411/eje.2000.049

Overwintering of Coccinella septempunctata (Coleoptera: Coccinellidae) at different altitudes in the Karkonosze Mts, SW Poland

Piotr CERYNGIER
Institute of Ecology, Polish Academy of Sciences, Dziekanów Leśny, 05-092 Łomianki, Poland; e-mail: ekolog@warman.com.pl

The body length variation, sex ratio, ovarian development and natural enemies (parasitoids and entomopathogenic fungi) of Coccinella septempunctata were studied during two dormancy seasons in three hibernation sites in the Karkonosze mountains: the top of Mt. Śnieżka (1,600 m a.s.l.), the top of Mt. Szrenica (1,360 m a.s.l.) and Karpacz, the village at the foot of Mt. Śnieżka (800 m a.s.l.). The proportion of females and mean body length increased with the altitude of the hibernaculum. Post-diapause maturation of ovaries occurred earlier in spring in females from Karpacz than from the mountain tops. The rate of parasitization of C. septempunctata by its most common parasitoid, the braconid Dinocampus coccinellae, in both seasons exceeded 70% at Karpacz and was 14-28% in the mountain top hibernacula. In contrast, the incidence of fungal infection (mainly by Paecilomyces farinosus and Beauveria bassiana) was higher in beetles overwintering on the two mountain tops.

Keywords: Coccinella septempunctata, hibernation, body size, sex ratio, ovarian development, mortality, parasitoids, Dinocampus coccinellae, entomopathogenic fungi

Received: September 22, 1999; Accepted: December 13, 1999; Published: October 30, 2000  Show citation

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CERYNGIER, P. (2000). Overwintering of Coccinella septempunctata (Coleoptera: Coccinellidae) at different altitudes in the Karkonosze Mts, SW Poland. EJE, 97(3), 323-328. doi: 10.14411/eje.2000.049
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