scholarly journals Phytoperiphyton of watercourses from the White Sea Basin (Murmansk District, Republic of Karelia, Russia)

Algologia ◽  
2020 ◽  
Vol 30 (4) ◽  
pp. 421-439
Author(s):  
S.F. Komulaynen ◽  
Keyword(s):  
White Sea ◽  
Taiga Zone ◽  
Relative Importance ◽  
Simultaneous Presence ◽  
The White Sea ◽  
Number Of Species ◽  
Dominant Complex ◽  
Climatic Regime ◽  
White Sea Basin ◽  
Boreal Complex

The results of phytoperiphyton studies in 92 watercourses of the White Sea basin are summarized and analyzed. Totally 540 taxa with a rank below the genus were identified. They belong to six divisions: Cyanophyta – 76, Ochrophyta – 374, Euglenophyta – 3, Dinophyta – 4, Rhodophyta – 8 and Chlorophyta – 75. Diatoms, cyanobacteria and chlorophytes form the basis of the species diversity (> 90%) in all studied rivers. The predominance of these groups reflects the specificity of the phytoperiphyton in the river systems of the boreal and subarctic zones. Leading families are Naviculaceae (174 species), Achnanthaceae (45), Desmidiaceae (43) and Fragilaceaceae (36). Together they cover 337 species or 65% of the total number of species found. The group of leading genera (187 species, 35%) includes Eunotia – 36 species, Achnanthes – 33, Navicula – 48, Pinnularia – 39, and Cymbella – 31 species. The heterogeneity of the climatic regime in the study area determines the simultaneous presence in the algae flora of widespread eurythermic species characteristic of the taiga zone, stenothermic rheophiles of alpine origin and the boreal complex typical of wetlands. The dominant complex is represented by a small number of species resistant to dynamic water loading. It is noted that the ecological-geographical spectra of algae are dominated by widespread oligogalobic species, acidophilic or indifferent to the pH of the medium. The relative importance of indicator species in the formation of groupings allows to refer the waters of the studied watercourses and reservoirs to the second class of purity.

scholarly journals Genomic evidence supports the introgression between two sympatric stickleback species inhabiting the White Sea basin

Heliyon ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. e06160
Author(s):  
Artem Nedoluzhko ◽  
Fedor Sharko ◽  
Svetlana Tsygankova ◽  
Eugenia Boulygina ◽  
Amina Ibragimova ◽  
...  
Keyword(s):  
White Sea ◽  
The White Sea ◽  
White Sea Basin

Reproductive Isolation Among Lateral Plate Phenotypes (Low, Partial, Complete) of the Threespine Stickleback, Gasterosteus Aculeatus, From the White Sea Basin and the Kamchatka Peninsula, Russia

Behaviour ◽  
1995 ◽  
Vol 132 (15-16) ◽  
pp. 1173-1181 ◽  
Author(s):  
Valery V. Ziuganov
Keyword(s):  
Gene Flow ◽  
Reproductive Isolation ◽  
Gasterosteus Aculeatus ◽  
White Sea ◽  
Kamchatka Peninsula ◽  
Threespine Stickleback ◽  
The White Sea ◽  
Lateral Plate ◽  
Freshwater Pond ◽  
White Sea Basin

AbstractReproductive isolation was investigated among sympatric lateral plate morphs of threespine stickleback from the White Sea basin and also among phenotypically similar morphs from the distant Kamchatka River basin (Lake Azabachije). Female choice tests show that gene flow is restricted among the completely plated and low plated morphs at both locations; behavioural isolation between these morphs is complete among Lake Azabachije fish, and nearly so (93% positive assortative mating) among White Sea basin fish. However, the experiments also demonstrate that there are no barriers to reproduction among the Azabachije and White Sea complete morphs, among the Azabachije low and White Sea complete morphs, nor among the Azabachije complete and White Sea low morphs. In addition, there is no evidence of barriers to gene flow among the low and partially plated morphs. Therefore, although gene flow is restricted among the extreme morphs within each locality, nevertheless gene exchange is possible, either directly or secondarily, among all phenotypes. The reproductive isolation between the complete and low morphs from the White Sea basin developed in situ no more than eight generations after the sticklebacks were introduced into an isolated freshwater pond. Therefore behavioural isolation can evolve very rapidly among the lateral plate phenotypes of Gasterosteus aculeatus.

scholarly journals Architecture of parallel adaptation to freshwater in multiple populations of threespine stickleback

2018 ◽  
Author(s):  
Nadezhda V. Terekhanova ◽  
Anna E. Barmintseva ◽  
Alexey S. Kondrashov ◽  
Georgii A. Bazykin ◽  
Nikolai S. Mugue
Keyword(s):  
Genetic Architecture ◽  
White Sea ◽  
Core Region ◽  
Selective Sweeps ◽  
The White Sea ◽  
Threespine Sticklebacks ◽  
White Sea Basin ◽  
Soft Selective Sweeps ◽  
Freshwater Environments

AbstractThreespine sticklebacks adapted to freshwater environments all over the Northern Hemisphere. This adaptation involved parallel recruitment of freshwater alleles in clusters of closely linked sites, or divergence islands (DIs). However, it is unclear to what extent the DIs involved in adaptation and the alleles within them coincide between populations adapting to similar environments. Here, we examine 10 freshwater populations of similar ages from the White Sea basin, and study the repeatability of patterns of adaptation in them. Overall, the 65 detected DIs tend to reside in regions of low recombination, underlining the role of reduced recombination in their establishment. Moreover, the DIs are clustered in the genome to the extent that is not explainable by the recombination rate alone, consistent with the divergence hitchhiking model. 21 out of the 65 DIs are universal; i.e., the frequency of freshwater alleles in them is increased in all analyzed populations. Universal DIs tend to have longer core region shared between populations, and the divergence between the marine and the freshwater haplotypes in them is higher, implying that they are older, also consistently with divergence hitchhiking. Within most DIs, the same set of sites distinguished the marine and the freshwater haplotypes in all populations; however, in some of the DIs, the genetic architecture of the freshwater haplotype differed between populations, suggesting that they could have been established by soft selective sweeps.

Reconstruction of the White Sea Basin during the late Younger Dryas

Boreas ◽  
2010 ◽  
Vol 39 (2) ◽  
pp. 273-285 ◽  
Author(s):  
ANTTI PASANEN ◽  
JUHA PEKKA LUNKKA ◽  
NIKO PUTKINEN
Keyword(s):  
White Sea ◽  
Younger Dryas ◽  
The White Sea ◽  
White Sea Basin

scholarly journals Diurnal variations of trace metals and heterotrophic bacterioplankton concentration in a small boreal lake of the White Sea basin

2010 ◽  
Vol 46 (2) ◽  
pp. 67-75 ◽  
Author(s):  
Liudmila S. Shirokova ◽  
Oleg S. Pokrovsky ◽  
Jérôme Viers ◽  
Sergey I. Klimov ◽  
Olga Yu. Moreva ◽  
...  
Keyword(s):  
Trace Metals ◽  
White Sea ◽  
Diurnal Variations ◽  
The White Sea ◽  
Heterotrophic Bacterioplankton ◽  
Boreal Lake ◽  
White Sea Basin

scholarly journals Velocity structure and density inhomogeneities of the White Sea crust

2020 ◽  
pp. 43-53
Author(s):  
N.V. Sharov ◽  
◽  
L.I. Bakunovich ◽  
B.Z. Belashev ◽  
M.Y. Nilov ◽  
...  
Keyword(s):  
Velocity Structure ◽  
White Sea ◽  
Reference Model ◽  
Deep Structure ◽  
The White Sea ◽  
Digital Maps ◽  
Instrumental Observations ◽  
White Sea Basin ◽  
Density Inhomogeneities ◽  
Using Data

The study area is the White Sea basin and adjacent territories. The relevance of the work carried out here is determined by active geodynamics, kimberlite magmatism, and prospects for the hydrocarbon search. The authors set the goal to model the velocity structure of the region’s crust using data from instrumental observations and the Integro software package. A comprehensive interpretation of gravimetric, magnetometric, seismic, petrophysical and geological data has been carried out. With the help of 2D models based on the DSZ profiles and digital maps of geophysical fields, refined density structures of local sections of the earth’s crust have been specified. The developed 3D density model gives a general picture of the deep structure of the region’s crust. Within its framework, the spatial positions of the layers of the velocity reference model are determined and their connections with density inhomogeneities and geophysical anomalies are established.

Development History and Quaternary Deposits of the White Sea Basin

2018 ◽  
pp. 135-163
Author(s):  
Aleksander E. Rybalko ◽  
Vitaliy A. Zhuravlyov ◽  
Lyudmila R. Semyonova ◽  
Mikhail Yu. Tokarev
Keyword(s):  
White Sea ◽  
The White Sea ◽  
Quaternary Deposits ◽  
Development History ◽  
White Sea Basin
Sign in / Sign up

Export Citation Format

Share Document