scholarly journals Temperature constraints shaped the migration routes of mackerel (Scomber scombrus) in the Black Sea

2017 ◽  
Vol 58 (2) ◽  
pp. 337-344 ◽  
Author(s):  
Daniel Pauly ◽  
Çetin Keskin
Keyword(s):  
Black Sea ◽  
North Atlantic ◽  
The Black Sea ◽  
Seasonal Temperature ◽  
Migration Routes ◽  
Atlantic Mackerel ◽  
Scomber Scombrus ◽  
The North ◽  
And Migration ◽  
Induced Changes

Conventional narratives explain fish migrations in term of requirements (food, mates, habitats, etc.), with adequate temperatures being optional. Here, using the example of a (commercially extinct) stock of Black Sea mackerel (Scomber scombrus), we suggest that seasonal migrations are driven by seasonal temperature cycles. Therein, temperature acts as a constraint determining where the fish can be at any given time, and not a one of several factors which they would consider when choosing between alternative migration routes. Generalizing, we suggest that temperature should generally be an explicit part of hypotheses about the migratory behaviours of marine fishes. For illustration of what may occur when this is not the case, it is suggested that the non-consideration of temperature in a model of North Atlantic mackerel migration may have led, among the researchers concerned, to a sense of complacency with respect to the climate change-induced changes in the phenology of this fish in the North Atlantic, whose distribution and migration are misleadingly seen as “stochastic”.

scholarly journals Black Sea hydroclimate and coupled hydrology was strongly controlled by high-latitude glacial climate dynamics

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Antje Wegwerth ◽  
Birgit Plessen ◽  
Ilka C. Kleinhanns ◽  
Helge W. Arz
Keyword(s):  
Black Sea ◽  
North Atlantic ◽  
Ice Sheet ◽  
The Black Sea ◽  
Mixing Times ◽  
The North ◽  
Frontal Systems ◽  
Continental Interior ◽  
The Last Glacial ◽  
Millennial Scale

AbstractThe Black Sea experienced pronounced millennial-scale changes in temperature and rainfall during the last glacial coinciding with Dansgaard-Oeschger cycles. However, little is known regarding the amount and sources of freshwater reaching this inland basin. Here, we present detailed ostracod δ18O data from the glacial Black Sea showing subdued Dansgaard-Oeschger cyclicity and four prominent longer-term saw-tooth shaped Bond-like cycles. We propose that the δ18Oostracods signature primarily reflects changes in the atmospheric circulation in response to the waxing and waning Eurasian Ice Sheet. The millennial-scale ice sheet variations likely resulted not only in latitudinal migrations of atmospheric frontal systems but also in shifts of dominant moisture sources for the Black Sea. Heavier isotopic precipitation arrived from the North Atlantic-Mediterranean realm during the warmer interstadials and lighter isotopic precipitation from the Eurasian continental interior during the colder stadials. The subdued Dansgaard-Oeschger variability likely reflects an integrated precipitation signal additionally affected by the long mixing times of the large Black Sea volume up to 1,500 years as suggested from hydrologic-isotope-balance modelling.

scholarly journals On recording of Atlantic mackerel Scomber scombrus Linnaeus, 1758 (Scombridae) in the coastal zone of Sevastopol and prospects for the revival of its fishing

2019 ◽  
Vol 4 (2) ◽  
pp. 3-10
Author(s):  
A. R. Boltachev ◽  
E. P. Karpova
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
The Black Sea ◽  
Commercial Fishing ◽  
Complete Disappearance ◽  
Mediterranean Population ◽  
North Caucasus ◽  
Atlantic Mackerel ◽  
Scomber Scombrus ◽  
Biological Studies

Information on catching of Atlantic mackerel Scomber scombrus Linnaeus, 1758, which has become very rare in the Black Sea in the last 50 years, is considered. Several specimens were found in the period from June 7 to 15, 2018 in the catches of commercial fixed nets in the lower part of the Balaklava Bay and in the coastal zone near the Bay. One specimen was given to the authors for the study; the results of morphometric and biological studies of this specimen are given in the work. The features of the area of Atlantic mackerel are briefly considered, the distribution and biology of four main populations of this species inhabiting European waters are given, with the main attention paid to the Black Sea population. Information on the level of modern fishing of this species in the world as a whole and separately in the Republic of Turkey is given. A retrospective analysis of the catching of mackerel in the Black Sea, in particular, near the coast of Crimea, is made. The reasons for the complete disappearance of its Black Sea population in the late 1960s in the Black and Marmara seas are analyzed. The conclusion was made that, despite the increase in some cases of mackerel catchings off the coast of Crimea, the North Caucasus and Turkey, the Black Sea population of this species either completely disappeared or is in a very depressed state, and the probability of its commercial fishing recovery in the region is minimal. The preliminary conclusion on the basis of the analysis of the given material has been made that the specimen caught in the Sevastopol region may belong to the Mediterranean population of Atlantic mackerel.

scholarly journals Ukraine-NATO cooperation communicative culture development

2020 ◽  
Vol 10 (19) ◽  
pp. 48-54
Author(s):  
Viacheslav Kudlai ◽  
◽  
Serhiy Tsebro ◽  
Keyword(s):  
Black Sea ◽  
North Atlantic ◽  
Security Policy ◽  
North Atlantic Treaty Organization ◽  
The Black Sea ◽  
Black Sea Region ◽  
The North ◽  
The North Atlantic ◽  
Culture Development ◽  
The Impact

The article deals with the peculiarities of the concepts "communicative culture" and "communicative instruction" perception in the diplomatic relations between Ukraine and the North Atlantic Treaty Organization context. Ukraine's mission to NATO culture, it’s forms of cooperation are analyzed. Main events that contributed to the cooperation between modern Ukraine and the North Atlantic Treaty Organization communicative culture development are outlined. "Communicative culture" is considered as a tool, as a set of best practices, the study subjects characteristic and as a subsequent communications trajectory to be reproduced. Among the publications related to diplomatic communication between Ukraine and NATO problems, there are narratives that consider this issue in the context of the "communicative guidance" term, which stands to denote the impact on a partner for one purpose or another: to persuade, to doubt, to force to do, etc; the state of the subject's propensity to make any communication. Ukraine-NATO communication practices confirm the correctness of the application of the concept of "communication culture". The Ukraine - NATO communicative culture formation begins with firmly commitment of sovereign, independent and stable Ukraine to democracy and the rule of law, which is the key to Euro-Atlantic security. NATO-Ukraine relations date back to the 1990s and have since become one of NATO's most important partnerships. Since 2014, as a result of the Russian-Ukrainian conflict, cooperation in important areas has been intensified. The establishment of constructive communication began after the end of the Cold War, when Ukraine joined the North Atlantic Cooperation Council (1991) and the Partnership for Peace (1994). In response to the Russian-Ukrainian conflict, NATO has stepped up its capacity-building and force-building support to Ukraine. NATO countries continue to condemn Russia's illegal Crimea annexation and its destabilizing and aggressive activities in eastern Ukraine and the Black Sea region. NATO has increased its presence in the Black Sea. Following the NATO Summit in Warsaw in July 2016, practical support is provided to Ukraine as part of the Comprehensive Assistance Package to Ukraine. In June 2017, the Ukrainian parliament passed a law restoring the country’s course towards NATO membership as a strategic goal of foreign and security policy.

scholarly journals The genetic composition of feeding aggregations of the Atlantic mackerel (Scomber scombrus) in the central north Atlantic: a microsatellite loci approach

2020 ◽  
Vol 77 (2) ◽  
pp. 604-612
Author(s):  
Davið Gíslason ◽  
Sarah J Helyar ◽  
Guðmundur J Óskarsson ◽  
Guðbjörg Ólafsdóttir ◽  
Aril Slotte ◽  
...  
Keyword(s):  
North Atlantic ◽  
Microsatellite Loci ◽  
Migration Patterns ◽  
Fish Stocks ◽  
North West ◽  
Atlantic Mackerel ◽  
Scomber Scombrus ◽  
The North ◽  
Specific Contribution ◽  
Impacts Of Climate Change

Abstract The impacts of climate change on marine ecosystems can be seen in the changing distribution, migration, and abundance of species in the oceans. For some species this changing environment may be beneficial and can support population expansions. In the northeast Atlantic (NEA), the Atlantic mackerel (Scomber scombrus) is undergoing an increase in stock size accompanied by changing summer migration patterns, which have resulted in an expansion further north and north west than previously recorded. This study uses microsatellite loci to confirm the differentiation among NEA and northwest Atlantic (NWA) mackerel spawning populations and to assess the level of structuring within these populations. In addition, to enable population-specific exploitation rates to be factored into fisheries management, we identified the origin of individuals composing the expanding feeding aggregations in the central north Atlantic (Greenland, Iceland, Faroes), with all aggregations tested originating from spawning populations in the NEA. This study showed that microsatellite loci were useful to assess the contribution of NEA and NWA populations to mixed feeding aggregations across the north Atlantic for large pelagic fish stocks but were not powerful enough to evaluate the specific contribution of known stocks within NEA and NWA.

Modeling of ecological conditions in the Euxine Basin in the Sarmatian and Maeotian by methods of diatom analysis

2019 ◽  
pp. 257-261
Author(s):  
Eleonora P. Radionova
Keyword(s):  
Black Sea ◽  
Late Miocene ◽  
The Black Sea ◽  
Subtidal Zone ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
North West ◽  
Ecological Conditions ◽  
The North

The associations and ecological conditions of the existence of modern diatoms of the North-West (Pridneprovsky), Prikerchensky and Eastern regions of the subtidal zone of the Black Sea are considered. Based on the unity of the composition of the Present and Sarmatian-Meotian diatom flora, an attempt has been made to model some of the ecological c situation of the Late Miocene Euxinian basin.

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