Abstract
Based on morphological and molecular characters, the gammaroid amphipod Dorogostaiskia parasitica, living as an epibiont on sponges in Lake Baikal, Siberia, is here split into five parapatrically or allopatrically distributed subspecies: D. p. parasitica (Dybowsky, Horae Societatis Entomologicae Rossicae 10(Beiheft):1–218, 1874), D. p. kamaltynovi subsp. nov., D. p. hanajevi subsp. nov., D. p. ushkaniensis subsp. nov., and D. p. stenocephala subsp. nov. Diagnostic differences are described in the shape of dorsal keels, shape of head, length of antenna 1, number of segments of accessory flagellum, shape and armature of coxal plates, relative lengths of pereopod segments, and body coloration. Each subspecies is characterized by a distinct mitochondrial lineage, differing from others by 5–11% in the sequence of the COI gene, while they do not differ in nuclear 28S rRNA gene sequence. The question of taxonomic ranks for members of intralacustrine species complexes is considered and an argument is presented for a use of the subspecies rank for parapatrically distributed population segments that are distinguished by multiple independent geographically congruent character differences. This usage sorts out a pattern of systematic diversity lower than one based on documented reproductive isolation (e.g., sympatry) of full species but stronger than that based on single-gene genealogies alone.
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Acknowledgments
We thank the crews of r/v “Titov” and r/v “Vereshchagin” and the expedition and project leaders I. V. Khanaev, S. V. Kirilchik, D. Yu. Sherbakov and E. Verheyen for enabling the fieldwork, and V. V. Petryashev (ZIN), K. Philipps-Bussau, P. Wagner and A. Brandt (ZMH), and C. O. Coleman (ZMB) for the access to museum specimens. We are grateful to Igor V. Khanaev and his diving team, who collected most of the material, and to Qui Yang, who kindly sent us DNA samples and voucher specimens from two localities. We thank Ravil M. Kamaltynov, who shared his information about variability of Dorogostaiskia, which directed our initial sampling, and his notes on color variation in his own material. We also thank Vadim V. Takhteev for discussion that clarified the nomenclature of the group and Koen Martens for valuable comments on the manuscript, and acknowledge the help of the MES laboratory staff at UH. Our work has been supported by grants from the Academy of Finland, partly in connection with the ESF EuroDiversity project MOLARCH (AF Grant 112001), from the Finnish Cultural Foundation and the Ella and Georg Ehrnrooth Foundation.
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Guest editors: T. von Rintelen, R. M. Marwoto, G. D. Haffner & F. Herder / Speciation in Ancient Lakes – Classic Concepts and New Approaches
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Daneliya, M.E., Väinölä, R. Five subspecies of the Dorogostaiskia parasitica complex (Dybowsky) (Crustacea: Amphipoda: Acanthogammaridae), epibionts of sponges in Lake Baikal. Hydrobiologia 739, 95–117 (2014). https://doi.org/10.1007/s10750-013-1671-x
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DOI: https://doi.org/10.1007/s10750-013-1671-x