Karyotypes of three species of the family Cottidae (Scorpaeniformes)

Terashima, Hiroaki; Ida, Hitoshi

doi:10.1007/bf02905361

Cited by 1 publication

(1 citation statement)

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“…These similarities, as well as NF (44 + 2), suggest that the metacentrics and submetacentrics in cytotypes II-V were formed through Robertsonian fusions. Karyological studies show that Robertsonian translocations are the main mechanism of structural changes in the chromosomes of marine sculpins of the family Cottidae (Vasilyev 1985;Terashima and Ida 1991;Moreva et al , 2019Radchenko et al 2020). Here we report the highest intraspecific variability in 2n (40 to 44) documented to date for this fish group (Arai 2011;Moreva et al , 2019Moreva 2020).…”

Section: Discussionmentioning

confidence: 99%

Differentiation of the frog sculpin Myoxocephalus stelleri Tilesius, 1811 (Actinopterygii, Cottidae) based on mtDNA and karyotype analyses

Морева¹,

Radchenko²,

Petrovskaya³

2021

CCG

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A molecular genetic and karyological study of the frog sculpin Myoxocephalus stelleri Tilesius, 1811 was carried out on an extensive sample from a large area of the species’ range. A total of 42 specimens was sampled from the Sea of Japan, Sea of Okhotsk, and coastal waters off the southern Kuril Islands, which makes this sampling scheme the most comprehensive to date. The level of mtDNA polymorphism was found to be low. The haplotypes of the species formed three phylogenetic groups. The unique M. stelleri haplotype from the coast of Shikotan Island linked all the studied groups, indicating that it is likely ancestral. Robertsonian polymorphism was identified in the species. In all five cytotypes (I – 2n = 44, II – 2n = 43, III – 2n = 42, IV – 2n = 41, V – 2n = 40; NF = 44+2) were identified, all of which were present in the Sea of Japan. Only one (cytotype I) was found in the Sea of Okhotsk, which is probably the closest to the ancestral karyotype. The significant chromosomal polymorphism and the presence of common haplotypes in the studied samples indicate their recent origin from a common ancestor and/or relatively recent contacts within the range. The discrepancies between mtDNA and karyotypes in assigning the ancestral M. stelleri to the coastal waters off Shikotan Island (southern Kuril Islands) and the Sea of Okhotsk, respectively, can be explained by the different inheritance mechanisms and the rates of evolution of molecular genetic and karyological traits.

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