Abstract
Caenorhabditis japonica is a bacteriophagous nematode species that was discovered on the semi-social burrower bug, Parastrachia japonensis, which demonstrates egg-guarding and provisioning behaviors. To understand the life history of C. japonica in relation to P. japonensis, we demonstrated the specificity of this association and fluctuations in nematode number on the insect throughout the year. C. japonica dauer larvae (DL), larvae in a nonfeeding diapause stage, were predominantly found as clumps on the adult female insects but rarely found on the male insects in all populations examined. This female-biased association was consistent throughout the year, but after the nymphs hatched, nematodes were not detected on the mother insects showing provisioning behavior. DL appeared on the nymphs, and the number of DL on the newly emerged female insects gradually increased thereafter. C. japonica has never been detected on other invertebrates collected from the P. japonensis habitat thus far. Our data suggest that the life cycles of C. japonica and P. japonensis are synchronized.
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Acknowledgments
We thank Mr. Mitsuki Shimomoto at Kochi Agriculture Research Center for providing P. japonensis females and Dr. Eizo Kondo, an emeritus professor of Saga University, for his critical reading of this manuscript.
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Communicated by: Sven Thatje
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Yoshiga, T., Ishikawa, Y., Tanaka, R. et al. Species-specific and female host-biased ectophoresy in the roundworm Caenorhabditis japonica . Naturwissenschaften 100, 205–208 (2013). https://doi.org/10.1007/s00114-013-1011-z
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DOI: https://doi.org/10.1007/s00114-013-1011-z