scholarly journals GENETIC DIFFERENTIATION OF SOCKEYE SALMON ONCORHYNCHUS NERKA(WALBAUM, 1792) IN THE BASIN OF KAMCHATKA RIVER

2019 ◽  
pp. 41-56
Author(s):  
Oksana A. Pfilganchuk ◽  
◽  
Nina Yu. Shpfigalskaya ◽  
Anastasfiya D. Denfisenko ◽  
Vladfimfir V. Savenkov ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Kamchatka River

scholarly journals Relationship between size-weight parameters of soсkeye salmon Oncorhynchus nerka smolts emigrated from Lake Azabachye (Kamchatka River basin) in 1979–2013 and abundance of mature fsh in the sea in 1982–2016

2018 ◽  
Vol 195 ◽  
pp. 128-139
Author(s):  
V. F. Bugaev
Keyword(s):  
Body Weight ◽  
River Basin ◽  
Body Length ◽  
Main Part ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
The Body ◽  
Positive Correlation ◽  
Kamchatka River

Two groups of juvenile sockeye salmon are feeding in Lake Azabachye. They belong to the 2nd order stock of the lake (stock A) and to other 2nd order stocks of middle and down stream tributaries of the Kamchatka River which underyearlings migrate into the lake for feeding and wintering (group E). The main part of the stock A leaves the lake to the sea at the age 2+ (mainly 2.3) and the youngsters of the group E migrate to the sea at the age 1+ (mainly 1.3). The body length and weight parameters of the stock A smolts at the age 2+ and the group E smolts at the age 1+ could be similar or dissimilar in particular years. The maximal difference between the smots of these stocks is observed in the years with higher body length and weight for the stock A. Mean for 1979–2016 length and weight of smolts at abovementioned ages are evaluated as 98.42/87.46 mm and 10.40/7.38 g for the A/E stocks. For the stock A, statistically signifcant positive correlation is noted between size-weight parameters of smolts in the years of emigration and their abundance in the years of mass return. However, the regression has a shift between the periods of emigration/return of 1979–2000/1982–2003 and 2003–2013/2006–2016. The correlation is higher for the frst period (r = 0.820; P < 0.001 for body weight and r = 0.797; P < 0.001 for body length, n = 16) than for the second one with higher abundance (r = 0.669; P < 0.05 for body weight and r = 0.711; P < 0.05 for body length, n = 11). On opposite, the returns of the group E depend weakly on size-weight parameters of its smolts for the period of emigration/return of 1979–1997/1982–2000 (no data for return in 1999) and the dependence is insignifcant for the period of 2000–2013/2003–2016.

scholarly journals Intrapopulation differentiation of sockeye salmon Oncorhynchus nerka of the lake-river systems on eastern coast of Kamchatka

2015 ◽  
Vol 183 (4) ◽  
pp. 27-40
Author(s):  
Anastasia M. Khrustaleva ◽  
Natalia V. Klovach
Keyword(s):  
Natural Selection ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Large Population ◽  
Eastern Coast ◽  
River Systems ◽  
Fast Growing ◽  
Genotype Frequencies ◽  
Early Maturing ◽  
Kamchatka River

Intrapopulation differentiation of the two large population systems of sockeye salmon from the Kamchatka and Apuka Rivers in East Kamchatka is considered by analysis of 45 SNP loci. Four samples were analyzed: 2 from the lower Kamchatka River (20 specimens for early run and 100 specimens for late run), 1 from the basin of Lake Azabachye belonged to the same system ( n = 81), and 1 from the Apuka River (53 specimens for mass run). No genetic differences were found between the samples for early run and late run in the Kamchatka River, though the late run sockeye could be subdivided into two genetically and morphologically different groupings, probably spawning in different biotopes: the first represented by small, fast-growing and early maturing individuals and the second represented by bigger, late maturing ones. For the Apuka River, the hypothesis was corroborated on simultaneous run of two genetically and ecologically different groupings of sockeye salmon: they differed statistically by allele and genotype frequencies of SNP loci. The intrapopulation differentiation is comparable or even exceeds the interpopulation differences for sockeye salmon of neighbor populations, though it is unobvious for geographically remote populations. This differentiation is supposedly caused by differences of natural selection in some SNP loci for different habitats.

Genetic Differentiation of Subpopulations of Sockeye Salmon (Oncorhynchus nerka) Within Lakes of Alaska, British Columbia, and Kamchatka, Russia

1994 ◽  
Vol 51 (S1) ◽  
pp. 147-157 ◽  
Author(s):  
Nataly V. Varnavskaya ◽  
Chris C. Wood ◽  
Rebecca J. Everett ◽  
Richard L. Wilmot ◽  
Vladimir S. Varnavsky ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
The United States ◽  
Allelic Frequency ◽  
Significant Heterogeneity ◽  
Frequency Data ◽  
Spawning Habitat ◽  
Lake Systems ◽  
Spawning Sites

Genetic differentiation among subpopulations of sockeye salmon (Oncorhynchus nerka) was investigated within nine intensively sampled lake systems located throughout the species' range using allozyme allelic frequency data collected by researchers in Canada, Russia, and the United States. Allelic frequencies at up to nine highly polymorphic loci were used to examine genetic diversity among 163 samples collected from 68 distinct spawning sites and to identify subpopulation structure within lakes. Significant heterogeneity was detected among sites within all lakes. The greatest differentiation was evident among subpopulations exhibiting different run timing (earlier vs. later) or utilizing different spawning habitat (tributary vs. littoral). These findings indicate that sockeye home precisely to natal streams, not just to lake systems, and underscore the importance of conserving individual spawning sites within sockeye populations.

scholarly journals ON EFFECT OF THE SIZE OF SOCKEYE SALMON ONCORHYNCHUS NERKA SMOLTS ON TIME OF THE SCALE SCLERITE FORMING DURING IMPLEMENTING OF THEIR COMPENSATORY GROWTH IN THE YEAR OF MIGRATION TO THE SEA FROM LAKE AZABACHYE (KAMCHATKA RIVER BASIN)

2018 ◽  
Vol 193 ◽  
pp. 88-98 ◽  
Author(s):  
V. F. Bugaev
Keyword(s):  
Growth Rate ◽  
River Basin ◽  
Sockeye Salmon ◽  
Compensatory Growth ◽  
Oncorhynchus Nerka ◽  
Scale Structure ◽  
Negative Dependence ◽  
Kamchatka River ◽  
Almost All

The Kamchatka River basin is the reproduction area for the secondary large Asian stock of sockeye salmon, one of the most valuable species of pacific salmons. Several major local stocks and groups of minor stocks occupy the basin, the main of them are: i) A — the aboriginal stock in Lake Azabachye (in the lower Kamchatka basin) which juveniles stay two winters in the lake and migrate to sea in the age 2+; ii) E — the transit group of local stocks spawning in the middle and lower tributaries of the Kamchatka which juveniles enter to Lake Azabachye for feeding and wintering and migrate to the sea after the wintering in the age 1+. The latter underyearlings get an additional mark on the scale (less than typical annuli) entering the Lake because of the feeding conditions change. That’s why almost all (90–95 %) juveniles have two zones of dense sclerites (ZDS) when leave Lake Azabachye, no matter of their 2+ or 1+ age. By the measurements in 1979–1987 of the smolts with two ZDS (A + E) in the year of their migration from Lake Azabachye to the sea, each sclerite on scale had formed in 6.61 days, on average, while the smolts staying in the lake for freshwater feeding (with one ZDS) formed each sclerite in 12.00 days, on average. Correspondingly, the migrants had wider distance between the sclerites (4–5 mm), as compared with those of non-migrants (2.0–2.5 mm) (with 150 times magnification). The aboriginal migrants demonstrate the effect of real compensatory growth in the year of emigration that is reflected in the scale structure as wider intersclerite distances. Negative dependence between the size of smolts and rate of their sclerites forming is observed on the data of 1987–2016 for the aboriginal stock A: the bigger the smolts at age 2+, the lower the rate, the longer the time of new sclerite forming, and the narrower the distance between sclerites, and vice versa. This dependence is interpreted as additional environment-dependent adjustment of the growth rate for the smolts with compensatory growth for their better adaptation and survival.

The Effect of Reproduction Biotopes on the Genetic Differentiation of Populations of Sockeye Salmon Oncorhynchus nerka

2005 ◽  
Vol 41 (5) ◽  
pp. 509-517 ◽  
Author(s):  
Vl. A. Brykov ◽  
N. E. Polyakova ◽  
A. V. Podlesnykh ◽  
E. V. Golub’ ◽  
A. P. Golub’ ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Genetic Differentiation Of Populations

Resumption of anadromy or straying? Origins of Sockeye Salmon Oncorhynchus nerka in the Elwha River

2021 ◽  
Author(s):  
Thomas P. Quinn ◽  
George R. Pess ◽  
Ben J.G. Sutherland ◽  
Samuel J. Brenkman ◽  
Ruth E. Withler ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Elwha River
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