Eur. J. Entomol. 113: 192-199, 2016 | 10.14411/eje.2016.023

Population dynamics, seasonality and aphid prey of Cheilomenes sexmaculata (Coleoptera: Coccinellidae) in an urban park in central Japan

Yasuko KAWAKAMI1, Kazuo YAMAZAKI2, Kazunori OHASHI3
1 Osaka Museum of Natural History, Osaka 546-0034, Japan; e-mail: yasukocafius@gmail.com
2 Osaka City Institute of Public Health and Environmental Sciences; e-mail: kazuo-yamazaki@city.osaka.lg.jp
3 Honmachi, Toyonaka City, Osaka 560-0021, Japan; e-mail: oohasikznr@yahoo.co.jp

The ladybird beetle, Cheilomenes sexmaculata (Fabricius), has been extending its distribution in and around urban areas at higher latitudes in Japan over the past 100 years. Between 2003 and 2011, we investigated the seasonal occurrence, aphid prey and population dynamics of this species in an urban park in Osaka City, central Japan. We found that C. sexmaculata completes three generations a year in Osaka. Overwintered adults emerge in March or April and produce two (or rarely one) generations by summer. Second-generation adults aestivate and subsequently produce another generation in autumn. This species feeds on five species of aphids that infest planted shrubs and alien weeds throughout the vegetative season. We analyzed the association between accumulated temperature and when overwintered adults first emerged. In addition, we determined the association between their time of emergence, peak abundance and last occurrence, and meteorological conditions. There was no association between the sum of effective temperatures and termination of adult overwintering. There was, however, an association between first occurrence and peak abundance, and climatic conditions, such as warm temperatures or low humidity. This species maintained a stable population in an urban park by becoming quiescent when climatic conditions were unfavourable or prey was scarce. We discussed these findings in relation to urban environmental factors, such as climate, food conditions and vegetation.

Keywords: Coleoptera, Coccinellidae, Cheilomenes sexmaculata, aphid, climate conditions, ladybird beetle, life cycle, urban vegetation

Received: April 20, 2015; Accepted: January 20, 2016; Published online: February 5, 2016

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