Amazing Discoveries of Benthic Fauna from the Abyssal Zone of Lake Baikal

Кондратов, И. Г.; Sitnikova, T. Ya.; Kaygorodova, Irina A.; Деникина, Н. Н.; Annenkov, Vadim V.; Ханаев, И. В.; Kirilchik, S. V.; Небесных, И. А.; Dzyuba, E. V.

doi:10.3390/biology10100972

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Declaring cryptic species seems to be a current trend in biodiversity related studies, and often it is a way to avoid thorough morphological investigations using LBGM 34 , 70 , 71 . Generally, biodiversity of all LB animals is understudied 12 , but it can be estimated properly with a combination of appropriate molecular markers, morphological studies, and taxonomic expertise 72 , 73 .…”

Section: Discussionmentioning

confidence: 99%

“…A dynamic geological and hydrological history set a stage for the evolution of a rich and mostly endemic fauna, with over 2500 species 11 . However, the true biodiversity of the lake is still insufficiently studied, especially from the abyssal zone 12 . Many animal groups have series of species flocks in LB, partly as a result of adaptive radiation 13 , 14 .…”

Section: Introductionmentioning

confidence: 99%

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Diversification of the shell shape and size in Baikal Candonidae ostracods inferred from molecular phylogeny

Karanovic

Pham

Sitnikova

2023

Sci Rep

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Ostracod shells are used extensively in paleontology, but we know little about their evolution, especially in ancient lakes. Lake Baikal (LB) is the world’s most important stronghold of Candonidae diversity. These crustaceans radiated here rapidly (12–5 Ma) and with an unprecedented morphological diversity. We reconstruct their molecular phylogeny with 46 species and two markers (18S and 16S rRNA), and use it to estimate the evolution of the shell shape and size with landmark-based geometric morphometrics (LBGM). High posterior probabilities support four major clades, which differ in node depth and morphospace clustering. After removing a significant allometry, the first three principal components (PCs) describe about 88% of total variability, suggesting a strong integration. Reconstructed ancestral shapes are similar for all four clades, indicating that diversification happened after colonization. Major evolutionary changes occurred from trapezoidal to elongated shapes. Sister species are separated in morphospace, by centroid size, or both, as well as by vertical and horizontal distributions in LB. Ostracod shell is a strongly integrated structure that exhibits high evolvability, with some extreme shapes, although mostly along the first PC. This is the first study that combines molecular phylogeny and LBGM for ostracods and for any LB group.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diversification of the shell shape and size in Baikal Candonidae ostracods inferred from molecular phylogeny

Karanovic

Pham

Sitnikova

2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…A dynamic geological and hydrological history set a stage for the evolution of a rich and mostly endemic fauna, with over 2,500 species 11 . However, the true biodiversity of the lake is still insu ciently studied, especially from the abyssal zone 12 . Many animal groups here have series of species ocks, partly as a result of adaptive radiation 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Diversification of the shell shape and size in Baikal Candonidae ostracods in the light of molecular phylogeny

Karanovic

Pham

Sitnikova

2022

Preprint

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Ostracod shells are used extensively in paleontology, but we know little about their evolution, especially in ancient lakes. Lake Baikal (LB) is the world’s most important stronghold of Candonidae diversity. These crustaceans radiated here rapidly (12-5 Ma) and with an unprecedented morphological diversity. We reconstruct their molecular phylogeny with 46 species and two markers (18S and 16S rRNA), and use it to estimate the evolution of the shell shape and size with landmark-based geometric morphometrics (LBGM). High posterior probabilities support four major clades, which differ in node depth and morphospace clustering. After removing a significant allometry, the first three principal components (PCs) describe about 88% of total variability, suggesting a strong integration. Reconstructed ancestral shapes are similar for all four clades, indicating that diversification happened after colonization. Major evolutionary changes occurred from trapezoidal to elongated shapes. Sister species are separated in morphospace, by centroid size, or both, as well as by vertical and horizontal distributions in LB. Ostracod shell is a strongly integrated structure that exhibits high evolvability, with some extreme shapes, although mostly along the first PC. This is the first study that combines molecular phylogeny and LBGM for ostracods and for any LB group.

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Unexpected Discovery of an Ectoparasitic Invasion First Detected in the Baikal Coregonid Fish Population

Kaygorodova

Matveenko

Dzyuba

2022

Fishes

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The omul, Coregonus migratorius (Georgi, 1775), an endemic fish of Lake Baikal, is the main commercial species of essential economic importance for the extensive region of Eastern Siberia. Despite the continuous 250-year study of Baikal omul and intensive commercial fishing, neither fishers nor biologists have ever mentioned or found external annelid parasites in numerous omul catches. Targeted parasitological studies have also never detected these ectoparasites on the body of this fish. In this study, we present the first reliable information on the existence of specific annelid parasites infecting the pelagic population of Baikal omul and report a 4% infestation of spawners in the Selenga River, the largest tributary of Lake Baikal. We also obtained the main morphometric parameters of the infected fishes, the morphology of the unknown parasite and its feeding strategy. DNA-based analysis was applied to ascertain the taxonomy of the leeches and revealed no closely related taxa existing in international genetic databases (e.g., GenBank) to date. A maximum genetic identity of 89–91% was detected with European Caspiobdella fadejewi. The genetic distances in 9–11% of the substitutions from the closest relatives were very high for a reliable molecular identification of a taxon. The Selenga omul leech may represent a potentially new species and genus.

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Amazing Discoveries of Benthic Fauna from the Abyssal Zone of Lake Baikal

Cited by 4 publications

References 34 publications

Diversification of the shell shape and size in Baikal Candonidae ostracods inferred from molecular phylogeny

Diversification of the shell shape and size in Baikal Candonidae ostracods inferred from molecular phylogeny

Diversification of the shell shape and size in Baikal Candonidae ostracods in the light of molecular phylogeny

Unexpected Discovery of an Ectoparasitic Invasion First Detected in the Baikal Coregonid Fish Population

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