Genetic diversity of copepod, Limnocalanus macrurus, from Russian Arctic seas

2019 ◽  
Vol 59 (6) ◽  
pp. 998-1007
Author(s):  
N. V. Gordeeva ◽  
A. V. Drits ◽  
M. V. Flint
Keyword(s):  
Demographic History ◽  
The Arctic ◽  
Arctic Seas ◽  
Siberian Arctic ◽  
Recent Origin ◽  
Glacial Relict ◽  
Limnocalanus Macrurus ◽  
The Baltic ◽  
The Last Glacial Maximum ◽  
The Last Glacial

The diversity, phylogenetic relationship and demographic history in glacial relict copepod, Limnocalanus macrurus from estuaries of large Siberian Arctic rivers Ob, Khatanga, Lena, Indigirka and Kolyma were studied using of mitochondrial cytochrome-oxidase c gene (CO I mtDNA). It was shown, that Siberian populations of Limnocalanus macrurus together with ones from Canadian Arctic and the Baltic Sea belong to the single Palearctic phylogenetic lineage, which probably survived in one refugium during the Last Glacial Maximum and then rapidly expand within the Arctic about 21 0007500 years ago. The presence of common haplotypes in L. macrurus from three Arctic seas and lack of differences in haplotypic frequencies may be caused recent origin of populations or present day genetic exchange between them.

scholarly journals Planktonic foraminifera genomic variations reflect paleoceanographic changes in the Arctic: evidence from sedimentary ancient DNA

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Joanna Pawłowska ◽  
Jutta E. Wollenburg ◽  
Marek Zajączkowski ◽  
Jan Pawlowski
Keyword(s):  
Ancient Dna ◽  
Sequence Data ◽  
Planktonic Foraminifera ◽  
Molecular Ecology ◽  
The Arctic ◽  
Marine Biodiversity ◽  
Neogloboquadrina Pachyderma ◽  
Rna Genes ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract Deciphering the evolution of marine plankton is typically based on the study of microfossil groups. Cryptic speciation is common in these groups, and large intragenomic variations occur in ribosomal RNA genes of many morphospecies. In this study, we correlated the distribution of ribosomal amplicon sequence variants (ASVs) with paleoceanographic changes by analyzing the high-throughput sequence data assigned to Neogloboquadrina pachyderma in a 140,000-year-old sediment core from the Arctic Ocean. The sedimentary ancient DNA demonstrated the occurrence of various N. pachyderma ASVs whose occurrence and dominance varied through time. Most remarkable was the striking appearance of ASV18, which was nearly absent in older sediments but became dominant during the last glacial maximum and continues to persist today. Although the molecular ecology of planktonic foraminifera is still poorly known, the analysis of their intragenomic variations through time has the potential to provide new insight into the evolution of marine biodiversity and may lead to the development of new and important paleoceanographic proxies.

scholarly journals Genomic evidence for the Old divergence of Southern European wolf populations

2020 ◽  
Vol 287 (1931) ◽  
pp. 20201206
Author(s):  
Pedro Silva ◽  
Marco Galaverni ◽  
Diego Ortega-Del Vecchyo ◽  
Zhenxin Fan ◽  
Romolo Caniglia ◽  
...  
Keyword(s):  
Canis Lupus ◽  
Common Ancestor ◽  
Demographic History ◽  
Population Decline ◽  
Divergence Times ◽  
Single Population ◽  
History Of ◽  
Fragmented Distribution ◽  
The Last Glacial Maximum ◽  
The Last Glacial

The grey wolf ( Canis lupus ) is one of the most widely distributed mammals in which a variety of distinct populations have been described. However, given their currently fragmented distribution and recent history of human-induced population decline, little is known about the events that led to their differentiation. Based on the analysis of whole canid genomes, we examined the divergence times between Southern European wolf populations and their ancient demographic history. We found that all present-day Eurasian wolves share a common ancestor ca 36 000 years ago, supporting the hypothesis that all extant wolves derive from a single population that subsequently expanded after the Last Glacial Maximum. We also estimated that the currently isolated European populations of the Iberian Peninsula, Italy and the Dinarics-Balkans diverged very closely in time, ca 10 500 years ago, and maintained negligible gene flow ever since. This indicates that the current genetic and morphological distinctiveness of Iberian and Italian wolves can be attributed to their isolation dating back to the end of the Pleistocene, predating the recent human-induced extinction of wolves in Central Europe by several millennia.

scholarly journals THE DYNAMICS OF HISTORICAL AND RECENT RANGE SHIFTS IN THE RUFFED GROUSE (Bonasa umbellus)

2020 ◽  
Author(s):  
Utku Perktaş
Keyword(s):  
Ecological Niche ◽  
Demographic History ◽  
Ecological Niche Modelling ◽  
Ruffed Grouse ◽  
Bonasa Umbellus ◽  
Effective Population ◽  
Niche Modelling ◽  
Range Dynamics ◽  
The Last Glacial Maximum ◽  
The Last Glacial

ABSTRACTClimate variability is the most important force affecting distributional range dynamics of common and widespread species with important impacts on biogeographic patterns. This study integrates phylogeography with distributional analyses to understand the demographic history and range dynamics of a widespread bird species, the Ruffed Grouse (Bonasa umbellus), under several climate change scenarios. For this, I used an ecological niche modelling approach, together with Bayesian based phylogeographic analysis and landscape genetics, to develop robust inferences regarding this species’ demographic history and range dynamics. The model’s predictions were mostly congruent with the present distribution of the Ruffed Grouse. However, under the Last Glacial Maximum bioclimatic conditions, the model predicted a substantially narrower distribution than the present. The predictions for the Last Glacial Maximum also showed three allopatric refugia in south-eastern and west-coast North America, and a cryptic refugium in Alaska. The prediction for the Last Interglacial showed two separate distributions to the west and east of the Rocky Mountains. In addition, the predictions for 2050 and 2070 indicated that the Ruffed Grouse will most likely show slight range shifts to the north and will become more widely distributed than in the past or present. At present, effective population connectivity throughout North America was weakly positively correlated with Fst values. That is, the species’ distribution range showed a weak isolation-by-resistance pattern. The extended Bayesian Skyline Plot analysis, which provided good resolution of the effective population size changes over the Ruffed Grouse’s history, was mostly congruent with ecological niche modelling predictions for this species. This study offers the first investigation of the late-Quaternary history of the Ruffed Grouse based on ecological niche modelling and Bayesian based demographic analysis. The species’ present genetic structure is significantly affected by past climate changes, particularly during the last 130 kybp. That is, this study offers valuable evidence of the ‘expansion–contraction’ model of North America’s Pleistocene biogeography.

scholarly journals Dog domestication and the dual dispersal of people and dogs into the Americas

2021 ◽  
Vol 118 (6) ◽  
pp. e2010083118
Author(s):  
Angela R. Perri ◽  
Tatiana R. Feuerborn ◽  
Laurent A. F. Frantz ◽  
Greger Larson ◽  
Ripan S. Malhi ◽  
...  
Keyword(s):  
Population Genetic ◽  
Close Correlation ◽  
The Arctic ◽  
Gray Wolf ◽  
Harsh Climate ◽  
Genetic Signatures ◽  
Dog Domestication ◽  
The Last Glacial Maximum ◽  
Genetic Results ◽  
The Last Glacial

Advances in the isolation and sequencing of ancient DNA have begun to reveal the population histories of both people and dogs. Over the last 10,000 y, the genetic signatures of ancient dog remains have been linked with known human dispersals in regions such as the Arctic and the remote Pacific. It is suspected, however, that this relationship has a much deeper antiquity, and that the tandem movement of people and dogs may have begun soon after the domestication of the dog from a gray wolf ancestor in the late Pleistocene. Here, by comparing population genetic results of humans and dogs from Siberia, Beringia, and North America, we show that there is a close correlation in the movement and divergences of their respective lineages. This evidence places constraints on when and where dog domestication took place. Most significantly, it suggests that dogs were domesticated in Siberia by ∼23,000 y ago, possibly while both people and wolves were isolated during the harsh climate of the Last Glacial Maximum. Dogs then accompanied the first people into the Americas and traveled with them as humans rapidly dispersed into the continent beginning ∼15,000 y ago.

The Legal Regime of Russian Territorial Waters

1968 ◽  
Vol 62 (1) ◽  
pp. 51-77 ◽  
Author(s):  
William E. Butler
Keyword(s):  
World War Ii ◽  
Pacific Coast ◽  
Russian Revolution ◽  
The Arctic ◽  
World War ◽  
Legal Regime ◽  
Arctic Seas ◽  
Soviet Government ◽  
The Pacific ◽  
The Baltic

Several elements have interacted to influence the course and pattern of the boundaries and the regime of Soviet territorial waters. The foremost of these is national security. All of the seas bordering the U.S.S.R. have narrow entrances which can be commanded easily by hostile foreign Powers. During the Russian Revolution and subsequent Civil War, German vessels and, after the War, Allied vessels in the Baltic and the Dardanelles restricted to an uncomfortable extent the freedom of action of the Soviet Government. Soviet weakness in the Baltic theater was a major factor in determining Soviet policy towards Finland and the Baltic states during the 1939-1941 period, and the proximity of NATO naval forces to the Baltic continues to provoke Soviet proposals to close the sea to noncoastal Powers. Similarly, the U.S.S.R. was compelled to endure Turkish violations of the Montreux Convention on the Turkish Straits during World War II while its Black Sea fleet was immobilized. The Pacific coast seas and the Atlantic and Pacific approaches to the Arctic seas are also susceptible to a blockade by hostile Powers. Even the Arctic seas themselves, once regarded as an unguarded but impregnable frozen boundary, have become unexpectedly vulnerable with the development of nuclear submarines.

scholarly journals Marine Heatwaves in Siberian Arctic Seas and Adjacent Region

2021 ◽  
Vol 13 (21) ◽  
pp. 4436
Author(s):  
Elena Golubeva ◽  
Marina Kraineva ◽  
Gennady Platov ◽  
Dina Iakshina ◽  
Marina Tarkhanova
Keyword(s):  
Numerical Modeling ◽  
Sea Ice ◽  
Arctic Ocean ◽  
Northern Region ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Arctic Seas ◽  
Siberian Arctic ◽  
The Arctic Ocean ◽  
The Impact

We used a satellite-derived global daily sea surface temperature (SST) dataset with resolution 0.25 × 0.25∘ to analyze interannual changes in the Arctic Shelf seas from 2000 to 2020 and to reveal extreme events in SST distribution. Results show that the second decade of the 21st century for the Siberian Arctic seas turned significantly warmer than the first decade, and the increase in SST in the Arctic seas could be considered in terms of marine heatwaves. Analyzing the spatial distribution of heatwaves and their characteristics, we showed that from 2018 to 2020, the surface warming extended to the northern deep-water region of the Laptev Sea 75∘ to 81∘N. To reveal the most important forcing for the northward extension of the marine heatwaves, we used three-dimensional numerical modeling of the Arctic Ocean based on a sea-ice and ocean model forced by the NCEP/NCAR Reanalysis. The simulation of the Arctic Ocean variability from 2000 to 2020 showed marine heatwaves and their increasing intensity in the northern region of the Kara and Laptev seas, closely connected to the disappearance of ice cover. A series of numerical experiments on the sensitivity of the model showed that the main factors affecting the Arctic sea-ice loss and the formation of anomalous temperature north of the Siberian Arctic seas are equally the thermal and dynamic effects of the atmosphere. Numerical modeling allows us to examine the impact of other physical mechanisms as well. Among them were the state of the ocean and winter sea ice, the formation of fast ice polynias and riverine heat influx.

scholarly journals Multidecadal dynamics of the Arctic copepod Limnocalanus macrurus in relation to environmental variability in the Baltic Sea

2019 ◽  
Vol 76 (7) ◽  
pp. 2427-2436 ◽  
Author(s):  
Heli Einberg ◽  
Riina Klais ◽  
Gunta Rubene ◽  
Georgs Kornilovs ◽  
Ivars Putnis ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Temperature ◽  
Environmental Variability ◽  
The Arctic ◽  
The Baltic Sea ◽  
Bottom Water Temperature ◽  
Limnocalanus Macrurus ◽  
The Baltic ◽  
Winter Severity

Abstract The Arctic Limnocalanus macrurus is a prominent representative of large copepods which performs several essential functions in freshwater and marine ecosystems. Being a cold stenotherm species, its distribution is primarily confined to deeper water layers. Based on the long-term observations from one of the largest spatially confined natural populations of this species in the Baltic Sea, we detected profound long-term variability of L. macrurus during 1958–2016: high abundances before the 1980s, then nearly disappearance in the 1990s and recovery in the 2000s. The main environmental parameters explaining the interannual variability of L. macrurus in spring were herring spawning stock biomass in preceding year, winter severity, and bottom water temperature in preceding summer. The effect of winter severity and water temperature was also non-linear. The sliding window correlation analysis pointed to a non-stationary relationship between the abundance of L. macrurus and the key variables. Given the observed pronounced seasonality in the population structure of L. macrurus (young stages dominated in the beginning of the year and only adults were left in the population in summer and autumn) we identified the dynamics of key environmental variables to understand this species under different ecosystem configurations and different combinations of drivers of change.

scholarly journals Modeling of Polar Ocean Tides at the Last Glacial Maximum: Amplification, Sensitivity, and Climatological Implications

2009 ◽  
Vol 22 (11) ◽  
pp. 2905-2924 ◽  
Author(s):  
Stephen D. Griffiths ◽  
W. Richard Peltier
Keyword(s):  
Last Glacial Maximum ◽  
Exact Analytical Solution ◽  
Glacial Maximum ◽  
The Arctic ◽  
Kelvin Wave ◽  
Ocean Tides ◽  
Last Glacial ◽  
Polar Ocean ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract Diurnal and semidiurnal ocean tides are calculated for both the present day and the Last Glacial Maximum. A numerical model with complete global coverage and enhanced resolution at high latitudes is used including the physics of self-attraction and loading and internal tide drag. Modeled present-day tidal amplitudes are overestimated at the standard resolution, but the error decreases as the resolution increases. It is argued that such results, which can be improved in the future using higher-resolution simulations, are preferable to those obtained by artificial enhancement of dissipative processes. For simulations at the Last Glacial Maximum a new version of the ICE-5G topographic reconstruction is used along with density stratification determined from coupled atmosphere–ocean climate simulations. The model predicts a significant amplification of tides around the Arctic and Antarctic coastlines, and these changes are interpreted in terms of Kelvin wave dynamics with the aid of an exact analytical solution for propagation around a polar continent or basin. These polar tides are shown to be highly sensitive to the assumed location of the grounding lines of coastal ice sheets, and the way in which this may contribute to an interaction between tides and climate change is discussed. Globally, the picture is one of energized semidiurnal tides at the Last Glacial Maximum, with an increase in tidal dissipation from present-day values, the dominant energy sink being the conversion to internal waves.

scholarly journals Simulation of fast-flow features of the Fennoscandian ice sheet during the Last Glacial Maximum

2003 ◽  
Vol 37 ◽  
pp. 383-389 ◽  
Author(s):  
Pirjo-Leena Forsström ◽  
Olli Sallasmaa ◽  
Ralf Greve ◽  
Thomas Zwinger
Keyword(s):  
Last Glacial Maximum ◽  
Ice Sheet ◽  
Glacial Maximum ◽  
Last Glacial ◽  
Flow Features ◽  
The Baltic ◽  
Fast Flow ◽  
Baltic Area ◽  
The Last Glacial Maximum ◽  
The Last Glacial

AbstractIn order to reconstruct the palaeoglaciation in Fennoscandia and northern Asia during the late-Weichselian ice-age phase, simulations with the dynamic and thermodynamic ice-sheet model SICOPOLIS are carried out. Our focus is on the Last Glacial Maximum (LGM) around 20 kyr BP. Climate forcing is based on mean annualsur-face temperature and precipitation derived from present data and Palaeoclimatic Modelling Intercomparison Project (PMIP) UKMO21 results for the LGM. These distributions are interpolated via a glacial index defined by the Greenland Icecore Project (GRIP) δ18O record. The extent of the Scandinavian and the Barents ice sheets is reproduced in good agreement with the Quaternary Environments of the Eurasian North (QUEEN) reconstruction, but the Kara Sea and Taymyr Peninsula areas are excessively glaciated. The fast-flow regions derived from the simulations, which are generally connected to regions with a temperate base and temperate ice above, are compared to hypothesized palaeo-ice-stream locations, especially in the Norwegian Channel and the Baltic area. In the Norwegian Channel, temperate basal conditions with temperate ice above prevail and favour fast flow. In the Baltic area, ice-sheet advance is generally accompanied by slow ice velocities (<200 m a–1). Some temporary fast-flow features occur due to transitional temperate-base conditions, and higher velocities arise in retreat phases.

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