Eur. J. Entomol. 104 (2): 165-172, 2007 | 10.14411/eje.2007.025

Geographic variation in body and ovipositor sizes in the leaf beetle Plateumaris constricticollis (Coleoptera: Chrysomelidae) and its association with climatic conditions and host plants

Teiji SOTA1, Masakazu HAYASHI2, Tsuyoshi YAGI3
1 Department of Zoology, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan; e-mail: sota@terra.zool.kyoto-u.ac.jp
2 Hoshizaki Green Foundation, Izumo, Shimane, 691-0076, Japan
3 The Museum of Nature and Human Activities, Hyogo, Sanda, Hyogo, 669-1546, Japan


Plateumaris constricticollis
is a donaciine leaf beetle endemic to Japan, which lives in wetlands and uses Cyperaceae and Poaceae as larval hosts. We analyzed geographic variation in body size and ovipositor dimensions in three subspecies (constricticollis, babai, and toyamensis) in different climatic conditions and on different host plants. In addition, the genetic differentiation among subspecies was assessed using nuclear 28S rRNA gene sequences. The body size of subspecies toyamensis is smaller than that of the other subspecies; mean body size tended to increase towards the northeast. Ovipositor length and width are smaller in subspecies toyamensis than in the other subspecies. Although these dimensions depend on body size, ovipositor length still differed significantly between toyamensis and constricticollis-babai after the effect of body size was removed. Multiple regression analyses revealed that body size and ovipositor size are significantly correlated with the depth of snow, but not temperature or rainfall; sizes were larger in places where the snowfall was greatest. Haplotypes of the 28S rRNA gene sequence were not shared among the subspecies. Subspecies constricticollis and babai each had a unique haplotype, whereas subspecies toyamensis had four haplotypes, indicating differentiation among local populations within toyamensis. The evolution of body and ovipositor size in relation to habitat conditions and host plants is discussed.

Keywords: Chrysomelidae, life history, molecular phylogeny, wetland, 28S rRNA gene

Received: September 1, 2006; Accepted: October 27, 2006; Published: April 25, 2007

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