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Secondary contact zone and genetic introgression in closely related haplodiploid social spider mites

Abstract

How frequently hybridisation and gene flow occur in the contact zones of diverging taxa is important for understanding the speciation process. Stigmaeopsis sabelisi and Stigmaeopsis miscanthi high-aggression form (hereafter, S. miscanthi HG) are haplodiploid, social spider mites that infest the Chinese silver grass, Miscanthus sinensis. These two species are closely related and parapatrically distributed in Japan. In mountainous areas, S. sabelisi and S. miscanthi HG are often found in the highlands and lowlands, respectively, suggesting that they are in contact at intermediate altitudes. It is estimated that they diverged from their common ancestors distributed in subtropical regions (south of Japan) during the last glacial period, expanded their distribution into the Japanese Archipelago, and came to have such a parapatric distribution (secondary contact). As their reproductive isolation is strong but incomplete, hybridisation and genetic introgression are expected at their distributional boundaries. In this study, we investigated their spatial distribution patterns along the elevation on Mt. Amagi using male morphological differences, and investigated their hybridisation status using single-nucleotide polymorphisms by MIG-seq. We found their contact zone at altitudes of 150–430 m, suggesting that their contact zone is prevalent in the parapatric area, which is in line with a previous study. Interspecific mating was predicted based on the sex ratio in the contact zone. No obvious hybrids were found, but genetic introgression was detected although it was extremely low.

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Fig. 1: The geographic distribution of the social spider mite Stigmaeopsis miscanthi species group in and around the Japanese Archipelago.
Fig. 2: Distributional patterns of S. sabelisi and S. miscanthi HG along altitude in both sexes based on the discriminant scores in the species identification by male morphology.
Fig. 3: The third leg of a normal and abnormal males.
Fig. 4: Sex ratio (proportion of males) in mite colonies along altitude.
Fig. 5: Neighbor-Net network of S. miscanthi species group collected from Mt. Amagi.
Fig. 6: Population genetic structure in mite colonies along altitude.

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Data availability

All raw reads of the MIG-seq data are available from the DDBJ Sequence Read Archive under BioProject ID PRJDB17427. The morphology, sex ratio, and cross-experimental data are shown in the Supplementary Materials.

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Acknowledgements

We thank Dr. Kentaro Nakano, Dr. Yooichi Kainoh and Tsukuba Experimental Forest, Mountain Science Center at the University of Tsukuba for providing the microscope for male morphology measurements and the space to cultivate the host plants of the mites. We thank Dr. Kyoichi Sawamura, Dr. Tomoki Chiba, Mr. Gomei Yoda, Ms. Hisaho Kobatyashi, Mr. Taito Sano, Mr. Ryuto Uchiyama, Ms. Sayuka (Nagase) Nitta, Ms. Aina Yokoi, and Ms. Ayana Tanino for their valuable suggestions and support. This research was supported in part by JSPS KAKENHI, Grant Number 20K06810 (Grant-in-Aid for Scientific Research C to Y. Sato), by JSPS KAKENHI, Grant Number 24H00055 (Grant-in-Aid for Scientific Research S to Y.T), by The Research Enhancement Project of Mountain Science Center, University of Tsukuba (to Y.Sato), by Nakatsuji Foresight Foundation (to Y.Sato), and by The Suzuki Takahisa Memorial Grant, University of Tsukuba (to Y. Sato).

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Contributions

Y. Sato conceived the study. Y. Sato, S. Konaka, Y. Tsumura, and Y. Suyama designed the study. S. Konaka, Y. Sato, and N. Matsumoto conducted the field surveys. S. Konaka performed the measurements, Y. Sato and S. Konaka analysed male morphology. S. Hirota, Y. Suyama, S. Konaka, Y. Sato, and Y. Tsumura performed molecular analyses. Y. Sato conducted the cross-experiment and analysed reproductive isolation. Y. Sato and S. Hirota wrote the first draft of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yukie Sato.

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Konaka, S., Hirota, S.K., Sato, Y. et al. Secondary contact zone and genetic introgression in closely related haplodiploid social spider mites. Heredity (2024). https://doi.org/10.1038/s41437-024-00708-y

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