Analysis of microsatellite variation in the rainbow trout (Parasalmo (Oncorhynchus) mykiss) from Kamchatka

Genetic variation of Kamchatka rainbow trout Parasalmo (O.) mykiss was examined using 10 microsatellite DNA loci, and phylogeographic comparison with other representatives of the species across the distribution range was performed. It was demonstrated that Kamchatka populations differed from other geographic groups of rainbow trout in a number of microsatellite loci. These populations also displayed distinct clustering and were characterized by lower genetic diversity. Analysis of a set of 26 different microsatellite loci (personal and literature data) demonstrated that most of the populations within the Kamchatka region were separated from one another, characterized by marked geographic differentiation, and affiliation to certain river basins. In Kamchatka rainbow trout, with high degree of probability, three geographic clusters (northwestern, southwestern, and eastern) were identified. In general, analysis of microsatellite DNA supported the data on low genetic diversity of the Kamchatka group Parasalmo (O.) mykiss, based on the variation estimates for a number of genes of nuclear and mitochondrial DNA, and allozyme loci.     

Genetic divergence of mykizha (<Emphasis Type="Italic">Parasalmo</Emphasis> (<Emphasis Type="Italic">Oncorhynchus</Emphasis>) <Emphasis Type="Italic">mykiss</Emphasis>) from Kamchatka inferred from restriction analysis and sequencing of mtDNA cytochrome b gene

The populations of mykizha Parasalmo (O.) mykiss from western and eastern coasts of Kamchatka were studied by restriction analysis of a fragment of fish mitochondrial genome that included the control region and the region of the cytochrome b gene ( cytb). The restriction patterns obtained with five enzymes ( MspI; Tru1I; RsaI; BsuRI; DdeI) were identical in all studied individuals. Sequencing of the cytb gene showed high similarity between all samples (99.6–100%). In general, the geographical group of mykiss from Kamchatka is monophyletic with low genetic divergence at the population level. Shantarian mykiss originates most likely from that native to Kamchatka.Translated from Genetika, Vol. 40, No. 12, 2004, pp. 1695–1701.Original Russian Text Copyright © 2004 by Pavlov, Kolesnikov, Melnikova, Ushakova.     

Allozyme variability and genetic divergence of Pacific trout (species Parasalmo) from western Kamchatka

Genetic variation in several populations of Parasalmo (Onchorhyncus) mykiss from Kamchatka was examined on the basis of data obtained by the author and results from literature. Three (sSOD-1*, LDH-C*, and EST-1*) out of 44 protein-coding loci were highly polymorphic. Low-frequency alternative alleles occurred at sAAT-1,2*, LDH-A2*, EST-5*, IDDH-1,2*, and sMDH-1,2*. The results of the present work and comparison with evidence on North American species indicated that, in the Kamchatka part of the range, P. mykiss is represented by several populations carrying unique alleles and forming a genetically independent group. Gene exchange between North American and Western Kamchatka populations is mainly determined by straying in the feeding stock of the American coastal form entering the Sea of Okhotsk. The genetic divergence and mean heterozygosities in the Kamchatka populations were low (D magnitude of 0.0002-0.0275; HS magnitude of 0.011-0.0371). The difference between the Western Kamchatka populations from the North American coastal form was so small (D magnitude of 0.0109-0.0241) that these forms clustered together. Genetic divergence of the Kamchatka populations and the inland North American P. mykiss is an order of magnitude higher (D magnitude of 0.1973-0.2367).     

Parasites of underyearling kamchatka mykiss Parasalmo mykiss mykiss (Osteichithyes:Salmonidae) in the Utkholok River (North-Western Kamchatka)

Eight species of parasites, Apiosoma piscicolum piscicolum, Apatemon sp., Diplostomum sp., Bunoderidae gen. sp., Crepidostomum metoecus, Hysterothylacium gadi aduncum, Salvelinema salmonicola, and Cucullanus truttae had been found in underyearling Kamchatka mykiss (with fork length 28-41 mm) from the Utkholok River, North-Western Kamchatka. Infestation rate of the fishes with each parasite species was rather low. Presence of C. truttae in underyearling Kamchatka mykiss could not be explained by the conceptual model of its life cycle proposed by Moravec (1979). Spatial and temporal isolation of underyearling Kamchatka mykiss and ammocoetes, as the elements of a local food web, suggest that the lamprey larvae do not participate in the transmission of C. truttae to underyearling Kamchatka mykiss.     

The Spring-Run Ecotype of the Steelhead Trout Parasalmo (Oncorhynchus) mykiss (Walbaum, 1792) (Salmonidae,Salmoniformes) in the Kamchatka Peninsula

Russian Journal of Marine Biology - A seasonal spring-run (vernal) ecotype of the Steelhead Trout Parasalmo (Oncorhynchus) mykiss (Walbaum, 1792) has been found in western Kamchatka for the first...     

Variation of cytochrome b gene in sympatric chars from kronotsky lake (Kamchatka Peninsula)

In previously identified sympatric char forms (species) from Kronotsky Lake (Kamchatka Peninsula) and a number of other chars from the genus Salvelinus, nucleotide sequences of the mtDNA cytochrome b gene were determined and phylogenetic analysis of these chars was performed. The divergence estimate of the cytochrome b gene in the Kronotsky char group (0.48%) coincided with the interpopulation difference estimates in northern Dolly Varden, which indicates a relatively recent divergence of the chars from Kronotsky Lake. Haplotypes of each form of the Kronotsky Lake chars are divided into two groups, which belonged to two different phylogenetic mtDNA lineages of northern Dolly Varden from Chukotka and Kamchatka. The formation of the Kronotsky char forms proved to be unrelated to the observed variability of the mtDNA cytochrome b gene.     

Variation of cytochrome b gene in sympatric chars from Kronotsky Lake (Kamchatka oblast)

In previously identified sympatric char forms (species) from Kronotsky Lake (Kamchatka Peninsula) and a number of other chars from the genus Salvelinus, nucleotide sequences of the mtDNA cytochrome b gene were determined and phylogenetic analysis of these forms was performed. The divergence of the cytochrome b gene in the Kronotsky char group (0.48%) coincided with the interpopulation difference estimates in northern Dolly Varden, which indicates a relatively recent divergence of the chars from Kronotsky Lake. Haplotypes of each form of the Kronotsky Lake chars are divided into two groups, which belonged to two different phylogenetic mtDNA lineages of northern Dolly Varden from Chukotka and Kamchatka. The formation of the Kronotsky char forms proved to be unrelated to the observed variability of the mtDNA cytochrome b gene.     

Phylogenetic analysis in chicken breeds inferred from complete cytochrome b gene information

Complete cytochrome b (cyt b) gene (1140 bp) nucleotide sequences were used to investigate characteristics of the genetic constitution of Chunky broiler chickens, and these were compared with the Hy-Line and WL-GM (Garber) line of White Leghorn, the GSP line of Fayoumi, the BM-C line of Black Minorca (egg-chickens), and an outgroup of wild-origin Japanese quail. A high genetic difference (five haplotypes) was observed at the cytochrome b region in the Chunky broiler in contrast to the high homologies observed among the other chicken breeds (egg-purpose). Chunky broilers can be distinguished from the other breeds (White Leghorn, Fayoumi, and Black Minorca) at positions 552 and 779. The molecular phylogenetic tree exhibited genetic differences within Chunky broilers, and between Chunky broilers and the other three chicken breeds. As a result, some chicken strains or breeds apparently different from the other egg-chickens may have contributed to the Chunky broiler formation. Artificial selection may be one of the biggest factors causing nucleotide diversity in the chicken breeds.     

Genetic evidence of extensive introgression of short-tailed ground squirrel genes in a hybridization zone of Spermophilus major and S. erythrogenys, inferred from sequencing of the mtDNA cytochrome b gene

We have completely sequenced the mtDNA cytochrome b gene of ground squirrels from the zone of overlapping ranges of Spermophilus major and S. erythrogenys in the Tobol-Ishim interfluve, which is a putative hybridization zone of these species. The results of the sequencing showed extensive introgression of mtDNA genes of the short-tailed ground squirrel S. e. brevicauda, whose haplotype had fully replaced the S. major haplotype. All of the ground squirrels from the Tobol-Ishim interfluve had a variant of the S. e. brevicauda mtDNA haplotype that was specific for this zone. On average, 119 substitutions (10.44%) were found between S. major from Ul'yanovsk oblast and S. e. brevicauda from the northern Kazakhstan, the mean genetic distance (D) between them being 0.115, which conforms to the corresponding parameters for the S. e. brevicauda-S. pygmaeus pair (122 substitutions, D = 0.118). Insignificant differences (seven substitutions, D = 0.043) were found between the S. major and S. pygmaeus haplotypes, which suggest that these species have similar mitochondrial haplotypes. Five to ten nucleotide substitutions (0.44–0.88%) were detected between the animals from the Tobol-Ishim interfluve and S. e. brevicauda. The mtDNA haplotype divergence D within the genus Spermophilus (ten species) for all codon positions ranged from 0.035 to 0.158. Phylogenetic reconstructions (MP, ML, and NJ trees) showed two well-differentiated clusters with high bootstrap support. However, there was different branching topology within the cluster and their species composition varied. The maximum likelihood tree, ML, differentiating the species into two subgenera, Citellus and Colobotis, most reliably reflected taxonomic relationships of the species from the genus Spermophilus, inferred from morphological and genetic biochemical data. The morphologically pure S. major (subgenus Colobotis) animals, used in the analysis, proved to carry the haplotype of another species, S. pygmaeus (subgenus Citellus). This poses a question on the existence of the specific haplotype of S. major, the reason of its replacement by haplotype of other species, and possible consequences of this phenomenon for survival of the species.     

Genetic evidence of extensive introgression of short-tailed ground squirrel genes in a hybridization zone of Spermophilus major and S. erythrogenys, inferred from sequencing of the mtDNA cytochrome b gene

We have completely sequenced the mtDNA cytochrome b gene of ground squirrels from the zone of overlapping ranges of Spermophilus major and S. erythrogenys in the Tobol-Ishim interfluve, which is a putative hybridization zone of these species. The results of the sequencing showed extensive introgression of mtDNA genes of the short-tailed ground squirrel S. e. brevicauda, whose haplotype had fully replaced the S. major haplotype. All of the ground squirrels from the Tobol-Ishim interfluve had a variant of the S. e. brevicauda mtDNA haplotype that was specific for this zone. On average, 119 substitutions (10.44%) were found between S. major from Ul'yanovsk oblast and S. e. brevicauda from the northern Kazakhstan, the mean genetic distance (D) between them being 0.115, which conforms to the corresponding parameters for the S. e. brevicauda-S. pygmaeus pair (122 substitutions, D = 118). Insignificant differences (seven substitutions, D = 0.043) were found between the S. major and S. pygmaeus haplotypes, which suggest that these species have similar mitochondrial haplotypes. Five to ten nucleotide substitutions (0.44--0.88%) were detected between the animals from the Tobol--Ishim interfluve and S. e. brevicauda. The mtDNA haplotype divergence D within the genus Spermophilus (ten species) for all codon positions ranged from 0.035 to 0.158. Phylogenetic reconstructions (MP, ML, and NJ trees) showed two well-differentiated clusters with high bootstrap support. However, there was different branching topology within the cluster and their species composition varied. The maximum likelihood tree, ML, differentiating the species into two subgenera, Citellus and Colobotis, most reliably reflected taxonomic relationships of the species from the genus Spermophilus, inferred from morphological and genetic biochemical data. The morphologically pure S. major (subgenus Colobotis) animals, used in the analysis, proved to carry the haplotype of another species, S. pygmaeus (subgenus Citellus). This poses a question on the existence of the specific haplotype of S. major, the reason of its replacement by haplotype of other species, and possible consequences of this phenomenon for survival of the species.     

Genetic population structure of Hemigrammocypris rasborella (Cyprinidae) inferred from mtDNA sequences

The genetic population structure of the small cyprinid Hemigrammocypris rasborella, distributed widely in lowlands of western Japan, was examined using partial sequence data of mitochondrial DNA (mtDNA). Molecular phylogenetic analysis revealed that the populations of the western Kyushu region were markedly differentiated from all eastern populations, such that the groups would be comparable to different species; their divergence was inferred to have occurred in the Late Miocene–Pliocene. Also, a largely divergent mtDNA group (with divergence in the early Pleistocene) was found in the Sanyo and northeastern Shikoku regions, forming a secondary contact zone in the western Kinki with the eastern mtDNA group. To date, these aspects of the population structure of H. rasborella appear to be unique among lowland fishes in western Japan. Deeper understanding of the formation processes of freshwater faunas in western Japan will require further comparisons of the phylogeographic patterns and ecological traits of constituent species.     

Acclimatization of salmon Oncorhynchus gorbuscha (Walbaum) in the European north: data from restriction analysis of mtDNA

Pink salmon spawners introduced into the White Sea basin (the Umba River) were compared to the spawners from the basin of the Sea of Okhotsk (the Ola River) using restriction analysis of two fragments of mitochondrial DNA (mtDNA). One of the fragments included genes ND5/ND6, the other, the cytochrome b gene and the control region. It was found that mtDNA variation and diversity at the earlier examined nuclear allozyme genes significantly decreased in the odd broodline of pink salmon 8 years after the introduction. The haplotype diversity in the even broodline was considerably lower than in the odd broodline exhibiting virtually no change two generations after the introduction. Based on the results obtained, a possible role of these changes in adaptation of White Sea pink salmon from the odd broodline to the new environment is discussed.     

Genetic divergence of sympatric charrs of the genus Salvelinus from Nachikinskoe Lake (Kamchatka)

We studied genetic differentiation of two charr species, Dolly Varden Salvelinus malma malma Walbaum and resident lacustrine charr Salvelinus sp., which sympatrically inhabit Nachikinskoe Lake (the Bol'shaya River basin) in southwestern Kamchatka Peninsula. Using restriction analysis (RFLP), three mitochondrial DNA fragments (ND1/ND2, ND5/ND6, and Cytb/D loop) amplified in polymerase chain reaction (PCR) were compared. The divergence of the mtDNA sequences between Salvelinus sp. and S. malma malma was 2.8%; Salvelinus sp. and S. taranetzi, 0.36%; Salvelinus sp. and S. krogiusae, 0.21%; Salvelinus sp. and S. alpinus, 3.0%. These results point to reproductive isolation of charrs in Nachikinskoe Lake and support the earlier suggestion on a close relationship between Salvelinus sp., S. taranetzi, and S. krogiusae.     

Genetic divergence of chars of the genus Salvelinus from Kronotsky Lake (Kamchatka Peninsula)

Chars from the genus Salvelinus, inhabiting lakes and lake-river systems, belong to morphologically and ecologically different forms whose taxonomic status is under dispute. In the present work, we have examined genetic variation and divergence in various chars from the Kronotsky lake basin: the lacustrine chars (white, nose, and long-head) and Dolly Varden char Salvelinus malma. The study was conducted using analysis of allozyme and microsatellite loci, myogens, RAPD, and restriction analysis of two mtDNA segments. The estimates of heterozygoisty at allozyme and microsatellite loci were similar to the corresponding parameters in populations of northern Dolly Varden and Arctic char. Heterozygote deficit was recorded in both samples of individual forms, and in the combined sample of all chars from Kronotsky Lake. For both markers, appreciable genetic differentiation among the samples of different char forms was found, which was comparable to that among the spatially isolated populations of northern Dolly Varden. This result indicates reproductive isolation among the char forms examined. However, this isolation is not complete, because no fixed differences between the forms by any of the genetic systems analyzed was found. The genetic differentiation among different forms of lacustrine chars, which corresponds to the interpopulation rather than interspecies level, is thought to be explained by their comparatively recent divergence.     

Molecular systematics of the Asiatic Viverridae (Carnivora) inferred from mitochondrial cytochrome b sequence analysis

Cytochrome b sequences of 15 species of Viverridae were used to investigate the systematic relationships of the Asiatic Viverridae and their affinities to African viverrid species. Phylogenetic analyses (maximum parsimony and neighbour-joining) supported the hypothesis of paraphyly of the subfamily Viverrinae, whereas the data suggests the monophyly of the two Viverridae subfamilies endemic to Asia. The Asiatic viverrids do not appear to have a unique origin. Results indicate that the Asiatic linsang is less closely related to the other Asiatic taxa, whereas the African civet ( Civettictis ) groups with the Asiatic civets ( Viverra , Viverricula ). The relationships between the three clades — civets, Paradoxurinae, Hemigalinae — cannot be firmly established, but they appear to be closely related together.     

Genetic structure and historical demography of Collichthys lucidus inferred from mtDNA sequence analysis

Fluctuations of global climate changes during the Pleistocene had a huge impact on the marginal seas of the Northwestern Pacific. To examine historical demography and the population genetic structure of Collichthys lucidus, a total of 151 individuals from 7 locations were sequenced at the 5′ end of mitochondrial DNA control region and 380-bp fragments were obtained. The results of AMOVA showed that the genetic variation among the two groups was 78.39 % (P?=?0.78) and among populations within groups was 0.43 % (P?=?0.02). Both mismatch distribution analysis and neutrality tests showed C. lucidus has experienced a recent population expansion. Three distinct clades suggested that C. lucidus might be isolated in the three marginal seas during the Pleistocene periods. No genetic divergence within groups should be explained by insufficient time to attain migration-drift equilibrium. The changes in sea level during the Pleistocene had a major effect on the C. lucidus phylogeographical pattern because it limited its dispersal and at times created isolated populations.     

A salmon id phylogeny inferred from mitochondrial cytochrome b gene sequences

Partial mitochondrial cytochrome b gene sequences of eight salmonid species were used in a PAUP analysis to generate a phylogeny of the group. The four genera represented are Salmo, Salvelinus, Oncorhynchus and Thymallus . The inferred phylogenetic tree coincides well with the classically derived one for these genera. The recent reclassification of the rainbow trout as a member of the genus Oncorhynchus is supported. The assignment of grayling as the outgroup is vindicated. The utility of gene sequence data to infer the phylogenetic relationships of the Salmonidae is discussed.     

Phylogenetic relationships of Caucasian shrew Sorex satunini Ogn. (mammalia) in the superspecies Sorex araneus inferred from the data of karyological analysis and the mtDNA cyt b gene sequencing

Using the data of karyological analysis, the phylogenetic relationships of Caucasian shrew Sorex satunini and the cryptic species of superspecies Sorer araneus were examined. In the population of Sorex satunini from the plain of North Ciscaucasia two deeply radiated cytochrome b genes (A and B) were identified. Genetic distance between haplotype A and B groups constituted 0.0675 +/- 0.008, which is higher than any distance in superspecies S. araneus. Possible introgression of type B haplotypes from the populations of the evolutionary lineage S. subaraneus--S. araneus in Pleistocene and the time of the appearance of the chromosomal polymorphism of S. araneus is discussed. Our results show that the use of only one mitochondrial marker can lead to false conclusions on taxonomic diversity