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Article

Experimental Crossing Confirms Reproductive Isolation between Cryptic Species within Eulimnogammarus verrucosus (Crustacea: Amphipoda) from Lake Baikal

1
Institute of Biology, Irkutsk State University, 664025 Irkutsk, Russia
2
Baikal Research Centre, 664011 Irkutsk, Russia
*
Authors to whom correspondence should be addressed.
Academic Editor: Tomer Ventura
Int. J. Mol. Sci. 2022, 23(18), 10858; https://doi.org/10.3390/ijms231810858
Received: 15 July 2022 / Revised: 26 August 2022 / Accepted: 13 September 2022 / Published: 17 September 2022
(This article belongs to the Section Molecular Microbiology)
Ancient lakes are known speciation hotspots. One of the most speciose groups in the ancient Lake Baikal are gammaroid amphipods (Crustacea: Amphipoda: Gammaroidea). There are over 350 morphological species and subspecies of amphipods in Baikal, but the extent of cryptic variation is still unclear. One of the most common species in the littoral zone of the lake, Eulimnogammarus verrucosus (Gerstfeldt, 1858), was recently found to comprise at least three (pseudo)cryptic species based on molecular data. Here, we further explored these species by analyzing their mitogenome-based phylogeny, genome sizes with flow cytometry, and their reproductive compatibility. We found divergent times of millions of years and different genome sizes in the three species (6.1, 6.9 and 8 pg), further confirming their genetic separation. Experimental crossing of the western and southern species, which are morphologically indistinguishable and have adjacent ranges, showed their separation with a post-zygotic reproductive barrier, as hybrid embryos stopped developing roughly at the onset of gastrulation. Thus, the previously applied barcoding approach effectively indicated the separate biological species within E. verrucosus. These results provide new data for investigating genome evolution and highlight the need for precise tracking of the sample origin in any studies in this morphospecies. View Full-Text
Keywords: cryptic variation; reproductive isolation; speciation; ancient lakes; Baikal; Crustacea; species flocks cryptic variation; reproductive isolation; speciation; ancient lakes; Baikal; Crustacea; species flocks
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MDPI and ACS Style

Drozdova, P.; Saranchina, A.; Madyarova, E.; Gurkov, A.; Timofeyev, M. Experimental Crossing Confirms Reproductive Isolation between Cryptic Species within Eulimnogammarus verrucosus (Crustacea: Amphipoda) from Lake Baikal. Int. J. Mol. Sci. 2022, 23, 10858. https://doi.org/10.3390/ijms231810858

AMA Style

Drozdova P, Saranchina A, Madyarova E, Gurkov A, Timofeyev M. Experimental Crossing Confirms Reproductive Isolation between Cryptic Species within Eulimnogammarus verrucosus (Crustacea: Amphipoda) from Lake Baikal. International Journal of Molecular Sciences. 2022; 23(18):10858. https://doi.org/10.3390/ijms231810858

Chicago/Turabian Style

Drozdova, Polina, Alexandra Saranchina, Ekaterina Madyarova, Anton Gurkov, and Maxim Timofeyev. 2022. "Experimental Crossing Confirms Reproductive Isolation between Cryptic Species within Eulimnogammarus verrucosus (Crustacea: Amphipoda) from Lake Baikal" International Journal of Molecular Sciences 23, no. 18: 10858. https://doi.org/10.3390/ijms231810858

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