scholarly journals ASSESSMENT OF TROUT NATURALIZATION IN WATER BODIES IN NORTH-EASTERN EUROPEAN RUSSIA (CASE OF VYCHEGDA RIVER TRIBUTARIES)

2021 ◽  
Vol 2021 (3) ◽  
pp. 17-27
Author(s):  
Alexander Borisovich Zakharov ◽  
Eduard Ivanovich Boznak
Keyword(s):  
Rainbow Trout ◽  
Sharp Decrease ◽  
River System ◽  
Fish Population ◽  
European Russia ◽  
Water Bodies ◽  
Eastern European ◽  
Natural Conditions ◽  
The North ◽  
North Eastern

The article highlights the ichthyological studies carried out in the Sysola river basin (a second order tributary of the Severnaya Dvina river), where rainbow trout is reared in cages for commercial purposes in the waters of regulated tributaries. The forecast for trout naturalization seems to be poor due to the fact that trout of different ages enter the river system every year as a result of technological accidents. It has been found that, despite the numerous cases of trout occurring in the natural conditions during 40 years, in the basin of the Sysola river has not formed a self-reproducing population of rainbow trout, and cases of its by-catch are rare. The data on the climatic and ecological conditions of the region are given. It has been inferred that the main factors preventing the naturalization of trout in the water bodies of the region are unfavorable temperature and hydrological regimes during the spawning and early ontogenesis of fish. The short summer feeding period does not allow trout to prepare for successful long wintering, as evidenced by a sharp decrease in the growth rate of fish that have fallen into natural conditions, compared to fish grown in cages. Trout of cage origin obviously do not form stable groups capable of reproducing the species and do not pose a threat to the aboriginal fish population, including Atlantic salmon, whose spawning and a significant part of the life cycle take place on many rivers of the north-eastern European Russia, including the basins of the Severnaya Dvina and Pechora rivers

scholarly journals Daphnia diversity in water bodies of the Po River Basin

2016 ◽  
Author(s):  
Silvia Marková ◽  
Catia Maurone ◽  
Erica Racchetti ◽  
Marco Bartoli ◽  
Valeria Rossi
Keyword(s):  
River Basin ◽  
North American ◽  
Water Bodies ◽  
12S Rrna ◽  
Long Distance ◽  
Po River ◽  
The North ◽  
North Eastern ◽  
Northern European Russia ◽  
Po River Basin

<p>Shallow water bodies dominate the areal extent of continental waters and host a proportion of biodiversity higher than the percentage of Earth’s surface they cover. <em>Daphnia</em> is a key component of small aquatic ecosystems food webs. Here we present the result of a survey in 24 ponds located in the core of Po river Basin, to assess the actual spreading of <em>Daphnia</em> species in one of the most productive areas of the Northern hemisphere. By using diagnostic genetic markers (<em>12S rRNA </em>and <em>ND5 </em>genes) we identified five <em>Daphnia</em> species: <em>D. ambigua</em>, <em>D. curvirostris</em>, <em>D. longispina</em>, <em>D. obtusa</em> and <em>D. pulex </em>in fourteen ponds. Additional analyses of two nuclear genes (<em>LdhA</em> and <em>Rab4</em>) revealed that <em>D. pulex</em> in the study area is native European strain. In opposite, <em>D. ambigua</em> shared haplotype with the North-Eastern American lineage that was introduced to Europe by long-distance dispersal. In the Po river Basin we identified a highly divergent lineage of <em>D. longispina </em>group that formed a clade with individuals from northern European Russia and might represent a new <em>Daphnia </em>species. <em>Daphnia</em> species in the Cremona province have European origin, except for <em>D. ambigua</em> which is a North American species spreading across Europe. Future attention will require monitoring of invasive species, particularly <em>D. ambigua</em> and the North American invasive clone of <em>D. pulex </em>that is already present in Northern Italy. </p>

scholarly journals Pear adaptability and productivity in the north-eastern part of European Russia

2018 ◽  
Vol 65 (4) ◽  
pp. 59-63
Author(s):  
S.V. Firsova ◽  
◽  
A.P. Sofronov ◽  
A.A. Rusinov ◽  
◽  
...  
Keyword(s):  
European Russia ◽  
The North ◽  
North Eastern ◽  
North Eastern Part

The Pleistocene deposits of the area between Coventry, Rugby and Leamington and their bearing upon the topographic development of the Midlands

1953 ◽  
Vol 237 (646) ◽  
pp. 209-260 ◽  
Keyword(s):  
River System ◽  
Recent Change ◽  
Wide Area ◽  
Drainage Pattern ◽  
Gentle Slope ◽  
The North ◽  
North Eastern

The sequence of drift deposits in an area between Leamington and Warwick has been established by mapping following an extensive programme of auger drilling. There is a broad differentiation into Older Drift now capping the higher land and Newer Drift forming terraces along the upper Avon and Learn. The Older Drift includes relics of an ancient glaciation correlated with the First Welsh (Berrocian) or Mindel phase, and thick deposits belonging to the Great Eastern and Second Welsh (Catuvelaunian) or Riss episode. Details of the lithology, disposition and fauna of both the Older and Newer Drifts are given. Suggested correlations with neighbouring areas are made. The deposits of the Catuvelaunian episode are shown to be largely of clay or sand laid down in a lake whose extent is traced over a wide area of the Midlands. To it the name ‘Lake Harrison’ has been given. It is shown that it formed in a great pre-glacial valley of very gentle slope which ran from the region of Bredon Hill down towards Leicester, forming part of the Trent system, and which was impounded at each end by Welsh and north-eastern ice respectively. The lake was eventually overridden by the north-eastern ice which went as far south as Moreton-in-the-Marsh. Not until this ice retreated was the Avon river system developed. Associated with this great and very recent change of drainage pattern are others of less importance affecting the Tame and Soar basins.

Mapping the Realm

2020 ◽  
pp. 16-70
Author(s):  
Marijn S. Visscher
Keyword(s):  
Caspian Sea ◽  
First Generation ◽  
River System ◽  
Coastal Regions ◽  
The Caspian Sea ◽  
The North ◽  
Political Narratives ◽  
North Eastern ◽  
The World ◽  
The Prestige

The chapter considers the geographical literature of early Seleucid writers. It is argued that the first generation of Seleucid geographers appropriated the eastern regions of the Seleucid Empire with their works, often prioritizing useful political narratives over geographical accuracy. As literature, these works seem inexorably linked to the ambition of the early Seleucid court, especially its desire to assert its dominance over vast and previously unchartered territories. Patrocles, for instance, wrote a description of the coastal regions of the Caspian Sea and the Asian river system, parts of which appear to be pure invention. However, his puzzling claims evoked the image of a world empire stretching as far as the edge of the Ocean, bolstering the prestige of the Seleucids. Another work on the north-eastern regions of the empire, by Demodamas, establishes an image of transcendental rule, an image which he anchors in a specifically Hellenistic view of the succession of empires. Thirdly, Megasthenes used his Indica to convey the idea of imperial domination through knowledge, expressed in a colonial key and backed up by targeted cultural reimaginations and precise measurements. The chapter concludes with a discussion of the challenge to Seleucid geography from Alexandria in the form of Eratosthenes, who overturned the Seleucid knowledge of Asia and India while reflecting a distinctly Ptolemaic view of the world.

Hydrocarbon products and their derivatives in fish of the Pechora River, North-Eastern European Russia

2011 ◽  
Vol 46 (10) ◽  
pp. 1035-1041 ◽  
Author(s):  
Anatoly A. Lukin ◽  
Guttorm N. Christiansen ◽  
Geir A. Dahl-Hansen ◽  
Julia N. Sharova ◽  
Lidia A. Belicheva
Keyword(s):  
European Russia ◽  
Eastern European ◽  
North Eastern ◽  
Pechora River

A 2000-year record of lake ontogeny and climate variability from the north-eastern European Russian Arctic

The Holocene ◽  
2016 ◽  
Vol 27 (3) ◽  
pp. 339-348 ◽  
Author(s):  
Tomi P Luoto ◽  
Peter Kuhry ◽  
Steffen Holzkämper ◽  
Nadia Solovieva ◽  
Angela E Self
Keyword(s):  
Climate Variability ◽  
Climate Warming ◽  
Temperature Reconstruction ◽  
Temperature Record ◽  
Recent Sediment ◽  
Eastern European ◽  
Russian Arctic ◽  
The North ◽  
North Eastern ◽  
Lake Ontogeny

A lake sediment record from the north-eastern European Russian Arctic was examined using palaeolimnological methods, including subfossil chironomid and diatom analysis. The objective of this study is to disentangle environmental history of the lake and climate variability during the past 2000 years. The sediment profile was divided into two main sections following changes in the lithology, separating the limno-telmatic phase between ~2000 and 1200 cal. yr BP and the lacustrine phase between ~1200 cal. yr BP and the present. Owing to the large proportion of semi-terrestrial chironomids and poor modern analogues, a reliable chironomid-based temperature reconstruction for the limno-telmatic phase was not possible. However, the lacustrine phase showed gradually cooling climate conditions from ~1200 cal. yr BP until ~700 cal. yr BP. The increase in stream chironomids within this sediment section indicates that this period may also have had increased precipitation that caused the adjacent river to overflow, subsequently transporting chironomids to the lacustrine basin. After a short-lived warm phase at ~700 cal. yr BP, the climate again cooled, and a progressive climate warming trend was evident from the most recent sediment samples, where the biological assemblages seem to have experienced an eutrophication-like response to climate warming. The temperature reconstruction showed more similarities with the climate development in the Siberian side of the Urals than with northern Europe. This study provides a characteristic archive of arctic lake ontogeny and a valuable temperature record from a remote climate-sensitive area of northern Russia.

Multiple indicators of human impacts on the environment in the Pechora Basin, north-eastern European Russia

2009 ◽  
Vol 9 (4) ◽  
pp. 765-779 ◽  
Author(s):  
Tony R. Walker ◽  
Peter D. Crittenden ◽  
Vladimir A. Dauvalter ◽  
Vivienne Jones ◽  
Peter Kuhry ◽  
...  
Keyword(s):  
Human Impacts ◽  
European Russia ◽  
Eastern European ◽  
Pechora Basin ◽  
Multiple Indicators ◽  
North Eastern
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