Early-Middle Holocene archaeological periodization and environmental changes in the Eastern Gulf of Finland: Interpretative correlation

2018 ◽  
Vol 465 ◽  
pp. 298-313 ◽  
Author(s):  
Dmitriy Gerasimov ◽  
Aivar Kriiska
Author(s):  
Ksenya V. Poleshchuk ◽  
Zinaida V. Pushina ◽  
Sergey R. Verkulich

The diatom analysis results of sediment samples from Dunderbukta area (Wedel Jarlsberg Land, West Svalbard) are presented in this paper. The diatom flora consists of four ecological groups, which ratio indicates three ecological zones. These zones show environmental changes of the area in early–middle Holocene that is demonstrating periods of regression and temperature trends.


Author(s):  
Nikifor Ostanin ◽  
Nikifor Ostanin

Coastal zone of the Eastern Gulf of Finland is subjected to essential natural and anthropogenic impact. The processes of abrasion and accumulation are predominant. While some coastal protection structures are old and ruined the problem of monitoring and coastal management is actual. Remotely sensed data is important component of geospatial information for coastal environment research. Rapid development of modern satellite remote sensing techniques and data processing algorithms made this data essential for monitoring and management. Multispectral imagers of modern high resolution satellites make it possible to produce advanced image processing, such as relative water depths estimation, sea-bottom classification and detection of changes in shallow water environment. In the framework of the project of development of new coast protection plan for the Kurortny District of St.-Petersburg a series of archival and modern satellite images were collected and analyzed. As a result several schemes of underwater parts of coastal zone and schemes of relative bathymetry for the key areas were produced. The comparative analysis of multi-temporal images allow us to reveal trends of environmental changes in the study areas. This information, compared with field observations, shows that remotely sensed data is useful and efficient for geospatial planning and development of new coast protection scheme.


2021 ◽  
pp. 1-8
Author(s):  
Thaísa Araújo ◽  
Helena Machado ◽  
Dimila Mothé ◽  
Leonardo dos Santos Avilla

Abstract Climatic and environmental changes, as well as human action, have been cited as potential causes for the extinction of megafauna in South America at the end of the Pleistocene. Among megamammals lineages with Holarctic origin, only horses and proboscideans went extinct in South America during this period. This study aims to understand how the spatial extent of habitats suitable for Equus neogeus and Notiomastodon platensis changed between the last glacial maximum (LGM) and the middle Holocene in order to determine the impact that climatic and environmental changes had on these taxa. We used species distribution modeling to estimate their potential extent on the continent and found that both species occupied arid and semiarid open lands during the LGM, mainly in the Pampean region of Argentina, southern and northeastern Brazil, and parts of the Andes. However, when climate conditions changed from dry and cold during the LGM to humid and warm during the middle Holocene, the areas suitable for these taxa were reduced dramatically. These results support the hypothesis that climatic changes were a driving cause of extinction of these megamammals in South America, although we cannot rule out the impact of human actions or other potential causes for their extinction.


2012 ◽  
Vol 48 (2) ◽  
pp. 351-366 ◽  
Author(s):  
Alexander M. Heyng ◽  
Christoph Mayr ◽  
Andreas Lücke ◽  
Bernd Striewski ◽  
Stefan Wastegård ◽  
...  

2016 ◽  
Vol 85 (2) ◽  
pp. 227-244 ◽  
Author(s):  
Laurent Lespez ◽  
Arthur Glais ◽  
José-Antonio Lopez-Saez ◽  
Yann Le Drezen ◽  
Zoï Tsirtsoni ◽  
...  

Numerous researchers discuss of the collapse of civilizations in response to abrupt climate change in the Mediterranean region. The period between 6500 and 5000 cal yr BP is one of the least studied episodes of rapid climate change at the end of the Late Neolithic. This period is characterized by a dramatic decline in settlement and a cultural break in the Balkans. High-resolution paleoenvironmental proxy data obtained in the Lower Angitis Valley enables an examination of the societal responses to rapid climatic change in Greece. Development of a lasting fluvio-lacustrine environment followed by enhanced fluvial activity is evident from 6000 cal yr BP. Paleoecological data show a succession of dry events at 5800–5700, 5450 and 5000–4900 cal yr BP. These events correspond to incursion of cold air masses to the eastern Mediterranean, confirming the climatic instability of the middle Holocene climate transition. Two periods with farming and pastural activities (6300–5600 and 5100–4700 cal BP) are evident. The intervening period is marked by environmental changes, but the continuous occurrence of anthropogenic taxa suggests the persistence of human activities despite the absence of archaeological evidence. The environmental factors alone were not sufficient to trigger the observed societal changes.


2018 ◽  
Vol 30 (3) ◽  
pp. 857-864
Author(s):  
HADEER Sheashaa ◽  
◽  
ZHAO Xiaoshuang ◽  
ALAA Salem ◽  
LIU Yan ◽  
...  

2013 ◽  
Vol 9 (2) ◽  
pp. 913-933 ◽  
Author(s):  
S. Joannin ◽  
B. Vannière ◽  
D. Galop ◽  
O. Peyron ◽  
J. N. Haas ◽  
...  

Abstract. Adding to the on-going debate regarding vegetation recolonisation (more particularly the timing) in Europe and climate change since the Lateglacial, this study investigates a long sediment core (LL081) from Lake Ledro (652 m a.s.l., southern Alps, Italy). Environmental changes were reconstructed using multiproxy analysis (pollen-based vegetation and climate reconstruction, lake levels, magnetic susceptibility and X-ray fluorescence (XRF) measurements) recorded climate and land-use changes during the Lateglacial and early–middle Holocene. The well-dated and high-resolution pollen record of Lake Ledro is compared with vegetation records from the southern and northern Alps to trace the history of tree species distribution. An altitude-dependent progressive time delay of the first continuous occurrence of Abies (fir) and of the Larix (larch) development has been observed since the Lateglacial in the southern Alps. This pattern suggests that the mid-altitude Lake Ledro area was not a refuge and that trees originated from lowlands or hilly areas (e.g. Euganean Hills) in northern Italy. Preboreal oscillations (ca. 11 000 cal BP), Boreal oscillations (ca. 10 200, 9300 cal BP) and the 8.2 kyr cold event suggest a centennial-scale climate forcing in the studied area. Picea (spruce) expansion occurred preferentially around 10 200 and 8200 cal BP in the south-eastern Alps, and therefore reflects the long-lasting cumulative effects of successive boreal and the 8.2 kyr cold event. The extension of Abies is contemporaneous with the 8.2 kyr event, but its development in the southern Alps benefits from the wettest interval 8200–7300 cal BP evidenced in high lake levels, flood activity and pollen-based climate reconstructions. Since ca. 7500 cal BP, a weak signal of pollen-based anthropogenic activities suggest weak human impact. The period between ca. 5700 and ca. 4100 cal BP is considered as a transition period to colder and wetter conditions (particularly during summers) that favoured a dense beech (Fagus) forest development which in return caused a distinctive yew (Taxus) decline. We conclude that climate was the dominant factor controlling vegetation changes and erosion processes during the early and middle Holocene (up to ca. 4100 cal BP).


The Holocene ◽  
2018 ◽  
Vol 28 (10) ◽  
pp. 1653-1663 ◽  
Author(s):  
Luminiţa Bejenaru ◽  
George Bodi ◽  
Simina Stanc ◽  
Mihaela Danu

The paper analyzes the archaeobotanical and archaeozoological remains originating from the middle Holocene (i.e. Chalcolithic site of Poduri- Dealul Ghindaru, in Eastern Romania, Bacău County). Poduri- Dealul Ghindaru site is the only tell settlement known in the area of existence of the Cucuteni culture, with inhabitation levels from Neolithic to the Bronze Age. In order to better understand the diet components of the prehistoric inhabitation belonging to the Cucuteni A and Cucuteni B phases, we follow evidence from archaeozoology, carpology, and palynology. For the carpological taxa, we calculate their ubiquity, diversity, and edibility score. The two sets of taxa are then compared in their similarity. Palynological data record the presence of cereal grains in all samples. We present the archaeozoological taxa with their quantification values and we calculate for the Cucuteni A and B phases, and in comparison with the Bronze Age sample, their richness, Shannon–Weaver diversity index and equitability. A correspondence analysis is carried out in order to compare the exploitation strategies for the three assemblages. For the archaeobotanical data, we find that the Cucuteni A phase is dominated by anthropogenic activity indicators and a heavy reliance on cereals. The Cucuteni B phase seems to be characterized by a restriction of human activity. The archaeozoological data highlight a preference for large mammals (cattle, dear, boar) during Cucuteni A and BA and smaller mammals during Cucuteni B (sheep/goat, pig, hare). We conclude that although the subsistence strategies remain similar, the dietary components change during the Cucuteni A and B phases, probably in response to environmental changes.


2014 ◽  
Vol 350 ◽  
pp. 84-96 ◽  
Author(s):  
Joonas J. Virtasalo ◽  
Daria Ryabchuk ◽  
Aarno T. Kotilainen ◽  
Vladimir Zhamoida ◽  
Andrey Grigoriev ◽  
...  

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