Long-term dynamics of the proportion of left-sided individuals in the populations of the European flounder Platichthys flesus (Linnaeus, 1758) in the White Sea

2021 ◽  
Vol 325 (3) ◽  
pp. 273-277
Author(s):  
G.V. Fuks ◽  
P.N. Yershov ◽  
V.M. Khaitov
Keyword(s):  
Interannual Variation ◽  
White Sea ◽  
The White Sea ◽  
The Past ◽  
Kandalaksha Bay ◽  
Onega Bay ◽  
European Flounder ◽  
Comparison Of The Results ◽  
Observation Period

Interannual variation in proportion of left-sided individuals has been studied in the populations of the European flounder from Onega (2002–2019), Mezen (2010–2016), and Dvina (2005–2019) bays of the White Sea. It was found that the flounder populations show no statistically significant and consistent changes in this character. The frequency of left-sided individuals in the local populations and the character of interpopulation differences in different years of the observation period remain relatively constant. The comparison of the results of this study with those of earlier studies reveals a similarity in proportions of left-sided fish over the past 40–60 years in flounder populations of the Kandalaksha Bay and Onega Bay. These results highlight the importance of the proportion of left-sided morphs for the analysis of population differentiation of the European flounder in the White Sea.

scholarly journals Age and growth of European flounder from the Chupa Inlet (Kandalaksha Bay, the White Sea)

2019 ◽  
Vol 323 (2) ◽  
pp. 93-104 ◽  
Author(s):  
P.N. Yershov ◽  
A.A. Matvienko ◽  
D.A. Aristov
Keyword(s):  
Growth Rate ◽  
Age Structure ◽  
White Sea ◽  
The White Sea ◽  
North East ◽  
The North ◽  
Kandalaksha Bay ◽  
Onega Bay ◽  
European Flounder ◽  
Males And Females

We studied age structure, growth and distribution of European flounder Platichthys flesus at the sea in Chupa Inlet (Kandalaksha Bay, the White Sea). Immature and mature fishes fed at shallows of Chupa Inlet and adjacent open sea area in June-August. Size-age and sex composition of fishes in catches are presented in the paper. Individuals of 17–27 cm length and 4–5 year age constituted the majority of catches (45%). On the whole, males numerically predominated over females in the samples. Analysis of sexual differences of growth has shown that females grew faster than males. The most intensive growth took place in July–August, according to the increments on the otoliths. Growth rate of the flounder from Chupa Inlet appeared to be similar to the growth rate of the flounder from other open shore sites of Kandalaksha Bay. We have compared also peculiarities of growth and age structure of flounder populations from Kandalaksha Bay to those from other bays of the White Sea. Significant differences of the growth rate were found between flounders from Kandalaksha, Onega, Dvina and Mezen' Bays. Both males and females from Onega Bay grew faster than other. Growth rate of fish decreased towards the north (Kandalaksha Bay) and the north-east (Mezen' Bay). The most slow-growing flounder inhabited shallows of Mezen' Bay. Statistical analysis has shown that age structure of flounder populations varied in different bays of the White Sea, and observed regional variations were characteristic for both males and females. Flounder population in Onega Bay was characterized by the dominance of the younger individuals compared to populations in other bays. The greatest mean age of flounder was registered in populations from the north-west (Kandalaksha Bay) and the north-east (Mezen' Bay) parts of the White Sea. Males and females in populations from Onega and Dvina Bays differed significantly in the mean age, and as a rule females were older. No age differences between sexes were found in flounder population of Mezen' Bay. We suppose that temperature conditions were among the main factors influencing regional differences in growth rate and age structure of the flounder populations in the White Sea.

Long-term environmental impact of an oil spill in the southern part of Onega Bay, the White Sea

2016 ◽  
Vol 42 (3) ◽  
pp. 205-215 ◽  
Author(s):  
V. V. Andrianov ◽  
A. A. Lebedev ◽  
N. V. Neverova ◽  
L. P. Lukin ◽  
T. Ya. Vorobyeva ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Oil Spill ◽  
White Sea ◽  
The White Sea ◽  
Onega Bay

Vegetation of the red algal belt of the White Sea (European Arctic, Russia)

2019 ◽  
Vol 53 (1) ◽  
pp. 39-65
Author(s):  
T. A. Mikhaylova
Keyword(s):  
White Sea ◽  
Algal Species ◽  
Lower Boundary ◽  
Depth Range ◽  
The White Sea ◽  
Kandalaksha Bay ◽  
Onega Bay ◽  
Red Algal ◽  
Taxonomic Groups ◽  
Favorable Conditions

In 2016–2018, during the summer period, the first detail studies of the red algal belt of the White Sea were carried out time with SCUBA diving at the Chupa Inlet, near the Cape Kartesh, and at the Kolvitsa Inlet (the Kandalaksha Bay), in the vicinity of Sonostrov Island (the White Sea Basin) and Bolshoy Zhuzhmuy Island (the Onega Bay). The upper boundary of the red algal belt lies at a depth of about 7 m, and the lower boundary, at a depth of about 20 m. In the White Sea, the algae distribution in the lower part of the photic zone depends on the geomorphological structure of the bottom and on the composition of the accompanying sedentary fauna, so the lower boundary may vary in the depth range from 14 down to 23 m. In total, 87 species of algae belonging to the three large taxonomic groups have been registered: Chlorophyta (13), Phaeophyceae (33), and Rhodophyta (41). Significant richness of the species composition, vertical zoning, and a variety of phytocoenoses of the red algal belt in different parts of the White Sea have been found. Phytocoenoses of the red algal belt refer to three associations: ass. Odonthalia dentata(–Pseudolithoderma extensum), ass. Phycodrys rubens+Coccotylus truncatus(–Pseudolithoderma extensum), and ass. Lithothamnion glaciale. Nineteen species of macrophytes were the most common and characteristic representatives of the red algal belt, including thirteen species of red algae, four species of brown algae, and two species of green algae. It has been found that abundant and characteristic species of the red algal belt have an additional edificatory function in the studied phytocoenoses, being the consorts that carry rich epiflora and form favorable conditions for increasing the species diversity of algae in the lower phytal zone. The observed rapid shrinkage of the depth range of the kelp and red algal belts, as well as the changes in the vertical distribution of some other algal species in the White Sea, require specific attention concerning altering of their habitat conditions.

New petro-paleomagnetic data of Kandalaksha and Onega Bay Islands in the White Sea

2020 ◽  
Author(s):  
Natalia Kosevich ◽  
Ivan Lebedev ◽  
Tanya Bagdasaryan
Keyword(s):  
Magnetic Susceptibility ◽  
White Sea ◽  
Flow Direction ◽  
Mobile Belt ◽  
Magnetic Fraction ◽  
The White Sea ◽  
Petrographic Composition ◽  
North West ◽  
Kandalaksha Bay ◽  
Onega Bay

<p>We have studied the AMS of metamorphic rocks (gneiss, granitoids, dykes) and soft sediments (mainly marine sediments or reworked diamicton) from the Kandalaksha and Onega Bay’s Islands of the White sea. The objects of research are located within the White sea mobile belt, represented by large tectonic nappes.</p><p>The magnetic susceptibility in soft sediment samples ranges from 78.6 E-6 to 1525E-6 (Km), and the degree (P) from 1.8% to 4.1%. Ellipsoids have a predominantly flattened type, such a distribution of AMS is typical for sedimentary rocks. At the same time, in a number of samples (from the Islands of Joker, Ipanchinikha and Olenevsky), the maximum axis is directed in a North-Westerly direction, which may indicate the flow direction. This is especially evident in flattened-triaxial ellipsoids (T=0.2-0.3). Values that have a T greater than 0.5 have a predominantly northerly direction and the orientation of minerals of the magnetic fraction and the direction of paleoflow is less pronounced.</p><p>The study of the anisotropy of the magnetic susceptibility of the Archean complexes composing the Islands of the Kandalaksha Bay of the White sea showed a high magnetic susceptibility-5E-6-1E-3 (Km), which confirms the change in the petrographic composition of gneiss. The degree of anisotropy (P) is 9% on average. It was found that the distribution of the main axes of the magnetic susceptibility ellipsoid coincides with shale and banding in the root outlets, while the maximum axis of the ellipsoid coincides with the West-North-West stretch of the regional fault. In the Onega Bay we sampled paleoproerozoic dykes, and there are AMS is coincided as contacts of studied dykes.</p><p>We done alternating field and thermal demagnetization of pilot collection which contains samples from all studied complexes. And it gives us not good results because of bad paleomagnetic record. Most of samples contain only low coercive or low temperature components and it mainly has modern direction.</p>

scholarly journals Variability of squamation of European flounder Platichthys flesus (Pleuronectidae) in the White Sea

2019 ◽  
Vol 323 (2) ◽  
pp. 105-111
Author(s):  
P.N. Yershov ◽  
A.A. Matvienko ◽  
E.P. Voronina
Keyword(s):  
White Sea ◽  
Morphological Differentiation ◽  
Structural Diversity ◽  
The Body ◽  
The White Sea ◽  
Local Populations ◽  
Platichthys Flesus ◽  
The North ◽  
Kandalaksha Bay ◽  
European Flounder

Squamation of the European flounder Platichthys flesus is formed by the common cycloid scales and the bony plates. The number of the bony plates and their localization on the body vary considerably in the flounders from different parts of their range. Study of the variability of bony plates coverage in the European flounder are of importance for understanding structural diversity and for use of this character for morphological differentiation of the local populations. We compared the bony plates on the eye side of the body in the flounders from Chupa Inlet (Kandalaksha Bay) and from the delta of the North Dvina River (Dvina Bay). The localization and the number of the bony plates near the bases of dorsal, anal, pectoral fins and above/below of the lateral line were analyzed. Our results clearly showed that the compared samples can be characterized by certain phenotypes, differing by number and location of the bony plates on the eye side of the fish body. The individuals of one phenotype were found in Chupa Inlet only. Small amount of the bony plates on the body and the presence of relatively wide aggregation of the bony plates near the pectoral fin are the traits of this phenotype. Three phenotypes were distinguished among fishes from the North Dvina delta. The absence of the bone plates on the most part of the body is typical for the prevalent phenotype. Individuals of the second phenotype were similar to the flounder from Chupa Inlet. Large amount of the bony plates covering the whole eye side of the body is characteristic for the third phenotype. The obtained results complement the existing data on the variability of squamation of the White Sea flounders, and indicate the importance of this character in the study of the differences between local populations in this region.

Trends and drivers of Macoma balthica L. dynamics in Kandalaksha Bay, the White Sea

2017 ◽  
Vol 98 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Evgeny A. Genelt-Yanovskiy ◽  
Dmitriy A. Aristov ◽  
Alexey V. Poloskin ◽  
Sophia A. Nazarova
Keyword(s):  
Population Dynamics ◽  
Growth Rates ◽  
White Sea ◽  
Macoma Balthica ◽  
Additive Models ◽  
The White Sea ◽  
Climate Oscillations ◽  
Kandalaksha Bay

Long-term population dynamics of marine invertebrates can be shaped by environmental conditions as well as biotic factors, including predation, diseases, interspecific or intraspecific competition. Towards the northern edge of species ranges the role of biotic interactions gradually decreases while the impact of climate oscillations becomes more important. This study examined the long-term changes in abundance, individual growth rates and shell shape characteristics of Macoma balthica, one of the dominant species in White Sea soft-bottom intertidal communities. To test the role of predators in changes in clam abundance, we examined the number of moonsnails Amauropsis islandica. Macoma balthica exhibited spatially synchronous population dynamics at six sites in Kandalaksha Bay, where densities of clams varied between 140 and 8500 ind. m−2 during the 21-year period of observations. Statistical modelling using generalized additive models (GAM) shows that a combination of mild winter and warm summer led to an increase in M. balthica density the following year. Predation by A. islandica had no impact on changes in M. balthica density. Growth rates of M. balthica were higher during a cool decade, but clams that lived in a warmer period were characterized by more globose shells. Our results suggest that the climate oscillations can be regarded as the key factor causing the shift in abundance of M. balthica in the White Sea during the last two decades via recruitment and survival.

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