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Kei W. Matsubayashi, Kei W.
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EXTENT OF USE OF THE NOVEL FABACEOUS HOST CENTROSEMA MOLLE BY HENOSEPILACHNA VIGINTIOCTOPUNCTATA (COLEOPTERA: COCCINELLIDAE) IN NUSA TENGGARA, INDONESIA Fujiyama, Naoyuki; Ueno, Hideki; Kahono, Sih; Hartini, Sri; Matsubayashi, Kei W.; Kikuta, Shogo; Katakura, Haruo
TREUBIA Vol 40 (2013): Vol. 40, December 2013
Publisher : Research Center for Biology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2033.478 KB) | DOI: 10.14203/treubia.v40i0.185

Abstract

The herbivorous ladybird beetle Henosepilachna vigintioctopunctata depends primarily on solanaceous plants. The utilisation of a novel fabaceous host, centro (Centrosema molle), by this beetle has been reported from several regions in Southeastern Asia, but details of the distribution and feeding habits of H. vigintioctopunctata populations on centro are largely unknown. Our study aimed to gather basic information on the utilisation of centro by H. vigintioctopunctata in the Nusa Tenggara region of southeastern Indonesia. Field surveys indicated that H. vigintioctopunctata did not yet utilize centro in the wild in this region. However, in feeding-choice experiments in the laboratory, all beetle populations tested from this region had some potential to utilize centro, i.e., showed some feeding acceptance of this plant. Based on these results, we discuss the current status of the Nusa Tenggara H. vigintioctopunctata populations in using centro as a host.
Micro-spatial and seasonal distributions of two sympatric host races of the phytophagous ladybird beetle Henosepilachna diekei (Coleoptera: Coccinellidae) and their host plants in West Java, Indonesia Matsubayashi, Kei W.; Kahono, Sih; Hartini, Sri; Katakura, Haruo
TREUBIA Vol 40 (2013): Vol. 40, December 2013
Publisher : Research Center for Biology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/treubia.v40i0.181

Abstract

Divergent adaptation to different host plants may promote reproductive isolation between hostspecific populations in phytophagous insects, since strict preferences for different host plants act as an isolating barrier between populations on the different hosts. Moreover, a high dependence on the host plants may cause additional reproductive barriers, e.g., differences in micro-spatial distribution and phenology between host-specific populations when the host plants differ in these characters. However, few studies have specifically addressed these two types of host-plant-induced isolating barriers. Here we compared the microspatialdistribution and seasonal fluctuation of two host races of the  phytophagous ladybird beetle Henosepilachna diekei (Coleoptera: Coccinellidae: Epilachnine) in Bogor, West Java, one depending onMikania micrantha (Asteraceae) and the other on Leucas lavandulifolia (Lamiaceae). In the field, M. micrantha was far more abundant and common than L. lavandulifolia throughout the year. M. micrantha wasfound in relatively moist habitats with moderate sunlight, while L. lavandulifolia was found in dry, sunny, open habitats. Consequently, the beetles depending on M. micrantha were more common and abundant than those depending on L. lavandulifolia. Although the two host races could encounter one another where the two host plants occurred in close proximity, they infrequently did so because of strict host fidelity coupledwith differences in the abundance and habitat of the two host plants. On the other hand, we detected no evidence of host-related seasonal isolation between the two host races.Key words: host race, host shift, micro-spatial distribution, phenology, seasonal fluctuation
Co-Authors Haruo Katakura, Haruo Hideki Ueno, Hideki Naoyuki Fujiyama, Naoyuki Shogo Kikuta, Shogo Sih Kahono Sri Hartini