Differences in Brain Transcriptomes of Closely Related Baikal Coregonid Species

Bychenko, Oksana S.; Суханова, Л. В.; Azhikina, Tatyana; Skvortsov, Timofey; Belomestnykh, Tuyana V.

doi:10.1155/2014/857329

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Sympatric evolution was invoked as the mechanism explaining the diversification of some multicellular organisms in the lake [84]. In particular, this explanation was used for Baikal actively-swimming coregonid fishes [85] and cottoid fishes [86]. Overall, studies of macroorganisms invoke two main scenarios to explain the origin of Baikal endemics: rapid radiation from one ancestor (e.g., sponges [87]) and endemic species emerging after multiple invasions (repeated colonizations) from one lineage (e.g., isopods [88]).…”

Section: Potential Endemism Within Baikal Protistsmentioning

confidence: 99%

Tracing the Origin of Planktonic Protists in an Ancient Lake

2020

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Ancient lakes are among the most interesting models for evolution studies because their biodiversity is the result of a complex combination of migration and speciation. Here, we investigate the origin of single celled planktonic eukaryotes from the oldest lake in the world—Lake Baikal (Russia). By using 18S rDNA metabarcoding, we recovered 1414 Operational Taxonomic Units (OTUs) belonging to protists populating surface waters (1–50 m) and representing pico/nano-sized cells. The recovered communities resembled other lacustrine freshwater assemblages found elsewhere, especially the taxonomically unclassified protists. However, our results suggest that a fraction of Baikal protists could belong to glacial relicts and have close relationships with marine/brackish species. Moreover, our results suggest that rapid radiation may have occurred among some protist taxa, partially mirroring what was already shown for multicellular organisms in Lake Baikal. We found 16% of the OTUs belonging to potential species flocks in Stramenopiles, Alveolata, Opisthokonta, Archaeplastida, Rhizaria, and Hacrobia. Putative flocks predominated in Chrysophytes, which are highly diverse in Lake Baikal. Also, the 18S rDNA of a number of species (7% of the total) differed >10% from other known sequences. These taxa as well as those belonging to the flocks may be endemic to Lake Baikal. Overall, our study points to novel diversity of planktonic protists in Lake Baikal, some of which may have emerged in situ after evolutionary diversification.

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Section: Potential Endemism Within Baikal Protistsmentioning

confidence: 99%

Tracing the Origin of Planktonic Protists in an Ancient Lake

2020

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“…Lake Baikal is one more unique place to study genetic and phenotypic divergence among sympatric whitefish ecotypes (Bychenko et al 2014). Obviously, in Baikal, in comparison with North American and European lakes, selection has been acting on limnetic ecotype even more strongly.…”

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confidence: 99%

Complete mitochondrial genomes of Baikal endemic coregonids: omul and lacustrine whitefish (Salmonidae:Coregonussp.)

Teterina

Суханова

Смирнов

et al. 2020

Mitochondrial DNA Part B

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Coregonid fishes are among the most successful groups in the subarctic, boreal, and subalpine fresh waters of the northern hemisphere. Limnetic-benthic sympatric species-pairs from two different evolutionary lineages, the North American lake whitefish (Coregonus clupeaformis species complex), and the European whitefish (Coregonus lavaretus species complex), are becoming the subject of close attention to explore the role of natural selection during the ecological speciation. Baikal endemic coregonids, limnetic omul (Coregonus migratorius), and benthic lacustrine whitefish (Coregonus baicalensis) are the only representatives of another unique lineage that has not left the lake since the divergence from the two above. Due to Pleistocene oscillations sympatric limnetic-benthic divergence has been replicated here many times within the same water body over a long geological period in contrast to both Europe and America where sympatric species-pairs are the results of post-glacial secondary-contacts between glacial isolates during the Late Pleistocene on the territory of each continent. Mitochondrial genomes encode genes that are essential for respiration and metabolism. Data on complete mitogenomes of Baikal endemic coregonids provided here will complement ongoing investigations on energy metabolism as the main biological function involved in the divergence between limnetic and benthic whitefish.

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