Genetic differentiation of sockeye salmon Oncorhynchus nerka (Walbaum, 1792) populations of eastern Kamchatka

Пильганчук, О А; Shpigalskaya, N.Yu.

doi:10.1134/s1063074013050052

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…One of them is believed to be the paleobasin located in the middle sections of the Kamchatka River. Additionally, there is partial evidence indicating a northern origin, likely stemming from the Beringia refugium [61][62][63]. The tendencies of changes in the intrapopulation diversity indices in both loci and in allele frequencies, at least in the intronic MHC2_251v2 locus in the study area (with a number of exceptions), are quite consistent with the prevailing ideas about the formation of the range of this species in Asia.…”

Section: Different Types Of Selection Identified In Asian Populationssupporting

confidence: 84%

“…Regarding island populations, our analysis of neutral SNPs as well as literature data on neutral genetic markers (microsatellites) [65] indicates a notable reduction in genetic diversity within island sockeye populations compared to continental populations. The observed low levels of intrapopulation polymorphism and significant genetic divergence among the island populations based on neutral markers can be attributed to several factors.…”

Section: Island Populationsmentioning

confidence: 54%

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Adaptive and Neutral Polymorphisms of the Onne-DAB Gene from the Major Histocompatibility Complex (MHC) in Sockeye Salmon Populations on the Asian Range

Хрусталева

2023

Diversity

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The variability of an MHC complex gene in sockeye salmon populations throughout the Asian range was studied to identify “footprints” indicative of pathogen-mediated selection and neutral demographic processes that have influenced these populations in both the recent and distant past. Genotype frequencies of a haplotype block consisting of two SNP loci (One_MHC2_109 and One_MHC2_190v2) in the Onne-DAB gene encoding the β-chain of the MHC class II molecule as well as allelic frequencies of 29 putative neutral SNPs have been traced in 27 sockeye salmon populations in the Asian Pacific coast. Differently directed clines of genetic diversity at the MHC2 loci were observed in sockeye salmon populations inhabiting the Sea of Okhotsk and Pacific coasts of the Kamchatka Peninsula. The formation of these clines can be attributed to a combination of historical processes associated with the colonization of the Asian range and the latitudinal gradient of abiotic and biotic factors influencing the variability of the Onne-DAB gene. In continental populations of sockeye salmon, balancing selection was not intense enough to conceal the impacts of demographic and historical processes associated with the fragmentation of the area in the late Pleistocene. In contrast, in island populations, balancing selection effectively maintained the diversity of the Onne-DAB gene despite a significant decrease in polymorphism observed in neutral regions of the genome.

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Section: Different Types Of Selection Identified In Asian Populationssupporting

confidence: 84%

Section: Island Populationsmentioning

confidence: 54%

Adaptive and Neutral Polymorphisms of the Onne-DAB Gene from the Major Histocompatibility Complex (MHC) in Sockeye Salmon Populations on the Asian Range

Хрусталева

2023

Diversity

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“…3D, 4C) and contained an admixture of genotypes identical to those identified in Azabachye Lake. Genetic divergence of Azabachye and tributary sockeye salmon in the Kamchatka river basin has been repeatedly demonstrated in studies examining the polymorphism of microsatellite loci and mtDNA sequences (Brykov et al, 2005;Beacham et al, 2006b;Pilganchuk & Shpigalskaya, 2013;Pilganchuk et al, 2019;Khrustaleva et al, 2020). Additionally, Brykov (Brykov et al, 2005) postulated that this divergence can be attributed to the different origins of sockeye salmon in the upper and lower reaches of the river basin.…”

Section: Metapopulation Of the Kamchatka River Basinmentioning

confidence: 95%

Genetic Structuring and Conservation of Asian Sockeye Salmon: Identification of Regional Stock Complexes

Khrustaleva

2024

Preprint

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In order to describe large-scale spatial structure of Asian sockeye salmon the variability of 45 SNP loci was analyzed in 22 samples from the North-West coast of the Pacific Ocean. Three large regional population complexes were identified: southwestern Kamchatka, Kamchatka River basin, and the North-East (comprising stocks from Koryak Highlands). Populations within the identified complexes are connected by gene migration and have a common origin, close geographic proximity, comparable climatic, landscape and environmental conditions in the freshwater and early marine periods of life. Populations confined to watersheds of the North coast of the Sea of Okhotsk (Palana and Okhota rivers), along with island populations, displayed noteworthy distinctions from the isolated population complexes. We hypothesize that the marked divergence observed in island populations is primarily caused by genetic drift occurring during long periods of isolation. The pronounced divergence of Palana River population may be the result of both genetic drift and natural selection, driven by the challenging smoltification and juvenile transition to the ocean, along with local adaptations during spawning and early life periods in the Palansky Lake. At the same time in the Okhota River population, demographic factors such as genetic drift and bottlenecks played a key role.

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“…The sockeye salmon run of the basin of Lake Kurilskoe and River Ozernaya has a complex structure. It includes several genetically heterogeneous subpopulations (Varnavskaya, 1988;Pilganchuk, 2014), which spawn in spatially separated areas at various times (Selifonova, 1978). The River Ozernaya is the only water body flowing out of Lake Kurilskoe.…”

Section: Introductionmentioning

confidence: 99%

Consequences of a sockeye salmon shortage for the brown bear in the basin of Lake Kurilskoe, Southern Kamchatka

Kolchin¹,

Volkova

Pokrovskaya

et al. 2021

Nature Conservation Research

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We studied the behavioural ecology of Ursus arctos (hereinafter-brown bear or bear) in the basin of Lake Kurilskoe (Kamchatka Peninsula) in the summer and autumn of 2017-2018. The aim of this study was a comparative assessment of the behaviour of brown bears with respect to the heterogeneity of trophic conditions. In 2018, considering an extremely high commercial catch of Oncorhynchus nerka (hereinafter-sockeye salmon or salmon) and high flood in the first half of the summer, the decline in the abundance and availability of salmon led to significant changes in the behaviour and distribution of bears. The success of fishing behaviour of bears in 2018 was found to be lower than in 2017. During the periods of salmon abundance in 2017, solitary bears formed temporary friendly associations that we did not observe in 2018. Due to the increased incidence of intraspecific predation in 2018, bears began to show aggression towards humans. Deterioration of the physical condition of some females and behavioural changes in food-procuring strategies were accompanied by the appearance of abandoned cubs. The peak of negative changes in the bear populations was noted in the first half of September when the energy requirements of bears increased. A modern approach to the development of the resources of sockeye salmon in the Basin of Lake Kurilskoe and River Ozernaya requires a serious revision of the fishing load in accordance with the characteristics of the population structure of sockeye salmon and its exclusive role in the local ecosystem. It is necessary to reconsider the «optimal» number of sockeye salmon allowed into the Lake Kurilskoe and its tributaries. The current practice of cancelling the passing days during which salmon can migrate unobstructed into and up the River Ozernaya towards Lake Kurilskoe is unacceptable.

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Genetic differentiation of sockeye salmon Oncorhynchus nerka (Walbaum, 1792) populations of eastern Kamchatka

Cited by 10 publications

References 15 publications

Adaptive and Neutral Polymorphisms of the Onne-DAB Gene from the Major Histocompatibility Complex (MHC) in Sockeye Salmon Populations on the Asian Range

Adaptive and Neutral Polymorphisms of the Onne-DAB Gene from the Major Histocompatibility Complex (MHC) in Sockeye Salmon Populations on the Asian Range

Genetic Structuring and Conservation of Asian Sockeye Salmon: Identification of Regional Stock Complexes

Consequences of a sockeye salmon shortage for the brown bear in the basin of Lake Kurilskoe, Southern Kamchatka

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