Comparative Life-History Studies of Nearctic and Palearctic Populations of Coccinella septempunctata (Coleoptera: Coccinellidae)

1 June 1995

journal article
Published by Oxford University Press (OUP) in Environmental Entomology

Vol. 24 (3) , 581-587
https://doi.org/10.1093/ee/24.3.581

Abstract

Life-history characteristics of four populations of Coccinella septempunctata L. were quantified and compared at 26°C and 18:6 (L:D) h on a diet of pea aphids, Acyrthosiphon pisum (Harris). Populations were from two locations in the United States (Iowa and Delaware)and two locations in Eurasia (France and Ukraine/Moldavia/Crimea). Large intrapopulation variation was observed in preoviposition, interoviposition, and number of days on which eggs were laid. This variation was a result of 10–35% of females entering diapause, whereas most females initiated oviposition within 12 d of eclosion an continued egg laying with interoviposition periods of septempunctata have not undergone local adaptation that would define these populations on the basis of geographical origin.

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