Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 3: vegetation history of the Santo Andre coastal area

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 459-464 ◽  
Author(s):  
Luisa Santos ◽  
María Fernanda Śnchez Goñi
Keyword(s):  
Coastal Area ◽  
Environmental Changes ◽  
Vegetation History ◽  
Coastal Lagoons ◽  
History Of

Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 1: the sedimentological and geochemical records of the Santo André coastal area

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 433-446 ◽  
Author(s):  
Maria da Conceição Freitas ◽  
César Andrade ◽  
Fernando Rocha ◽  
Colombo Tassinari ◽  
José Manuel Munhá ◽  
...  
Keyword(s):  
Coastal Area ◽  
Environmental Changes ◽  
Coastal Lagoons

Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 2: microfossil multiproxy reconstruction of the Santo André coastal area

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 447-458 ◽  
Author(s):  
Alejandro Cearreta ◽  
Mário Cachão ◽  
M. Cristina Cabral ◽  
Roberto Bao ◽  
Maria de Jesus Ramalho
Keyword(s):  
Coastal Area ◽  
Environmental Changes ◽  
Coastal Lagoons

scholarly journals Vegetation history of Central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater

2012 ◽  
Vol 8 (2) ◽  
pp. 1409-1441 ◽  
Author(s):  
A. A. Andreev ◽  
E. Morozova ◽  
G. Fedorov ◽  
L. Schirrmeister ◽  
A. A. Bobrov ◽  
...  
Keyword(s):  
Impact Crater ◽  
Environmental Changes ◽  
Vegetation History ◽  
Lacustrine Sediments ◽  
Plant Macrofossils ◽  
Early Holocene ◽  
Shrub Tundra ◽  
Dwarf Birch ◽  
History Of ◽  
Palynological Study

Abstract. Frozen sediments from three cores bored in permafrost surrounding of the El'gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils, and rhizopods. The palynological study of the cores contributes to a higher resolution of time intervals presented in a poor temporal resolution in the lacustrine sediments; namely the Allerød and succeeding periods. Moreover, permafrost records better reflect local environmental changes, thus, allowing more reliable reconstruction of the local paleoenvironments. The new data confirm that shrub tundra with dwarf birch, shrub alder and willow dominated in the lake surroundings during the Allerød warming. Younger Dryas pollen assemblages reflect abrupt changes to grass-sedge-herb dominated environments reflecting significant climate deterioration. Low shrub tundra with dwarf birch and willow dominate the lake vicinity at the onset of the Holocene. The founds of larch seeds indicate its local presence around 11 000 cal. yr BP and, thus a northward shift of treeline by about 100 km during the early Holocene thermal optimum. Forest tundra with larch and shrub alder stands grew in the area during the early Holocene. After ca. 3500 cal. yr BP similar-to-modern plant communities became common in the lake vicinity.

scholarly journals Environmental dynamics, population history and the terraced agro-landscapes of mountainous Dagestan

2020 ◽  
Vol 3 ◽  
pp. 113-118
Author(s):  
Natalia Ryabogina ◽  
◽  
Idris Idrisov ◽  
Eleonora Nasonova ◽  
Alexandr Borisov ◽  
...  
Keyword(s):  
Middle Ages ◽  
Environmental Changes ◽  
Vegetation History ◽  
Population History ◽  
Coupled Analysis ◽  
The Holocene ◽  
The North ◽  
The Western Caucasus ◽  
History Of ◽  
The Middle Ages

The mountainous Dagestan region of the North-Eastern Caucasus has a unique historical development based in independent cereal domestication and terraced agriculture. However, there is little to no data on the nature and timing of environmental changes throughout the settlement history of this region. In contrast to the much-studied neighboring Caucasus regions, Dagestan remains mostly unexplored from the standpoint of paleoecology. In 2017, we investigated a detailed radiocarbon-dated 185 cm peat sequence from the Shotota swamp located in the mountainous zone of the Dagestan. Sediments of the swamp span most of the Holocene (about 9000 years) from the Neolithic to the Middle Ages, and let us, for the first time, study Holocene vegetation history of the Eastern Caucasus. The results of the study showed significant discrepancies in the timing and sequence of the expansion of tree species in the Holocene in comparison with Transcaucasia and the Western Caucasus. According to data from the second swamp, Arkida, we found that the vegetation of the adjacent flat parts of Dagestan was dry and treeless for the last four thousand years. With the data obtained on the environmental dynamics of vegetation, we conducted a coupled analysis of climate dynamics in Dagestan. One of the phenomena of the ancient development of mountainous Dagestan is the largescale terracing of slopes, which from the Middle Ages completely transformed the territory into agro-landscapes.

scholarly journals Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater

2012 ◽  
Vol 8 (4) ◽  
pp. 1287-1300 ◽  
Author(s):  
A. A. Andreev ◽  
E. Morozova ◽  
G. Fedorov ◽  
L. Schirrmeister ◽  
A. A. Bobrov ◽  
...  
Keyword(s):  
Impact Crater ◽  
Environmental Changes ◽  
Vegetation History ◽  
Lacustrine Sediments ◽  
Plant Macrofossils ◽  
Early Holocene ◽  
Shrub Tundra ◽  
Dwarf Birch ◽  
History Of ◽  
Palynological Study

Abstract. Frozen sediments from three cores bored in the permafrost surrounding the El'gygytgyn Impact Crater Lake have been studied for pollen, non-pollen palynomorphs, plant macrofossils and rhizopods. The palynological study of these cores contributes to a higher resolution of time intervals presented in a poor temporal resolution in the lacustrine sediments; namely the Allerød and succeeding periods. Moreover, the permafrost records better reflect local environmental changes, allowing a more reliable reconstruction of the local paleoenvironments. The new data confirm that shrub tundra with dwarf birch, shrub alder and willow dominated the lake surroundings during the Allerød warming. Younger Dryas pollen assemblages reflect abrupt changes to grass-sedge-herb dominated environments reflecting significantly drier and cooler climate. Low shrub tundra with dwarf birch and willow dominate the lake vicinity at the onset of the Holocene. The find of larch seeds indicate its local presence around 11 000 cal yr BP and, thus a northward shift of treeline by about 100 km during the early Holocene thermal optimum. Forest tundra with larch and shrub alder stands grew in the area during the early Holocene. After ca. 3500 cal yr BP similar-to-modern plant communities became common in the lake vicinity.

A LATE HOLOCENE VEGETATION HISTORY OF LOWLAND GUATEMALA: RECORDS FROM LAKE IZABAL, EASTERN GUATEMALA

2020 ◽  
Author(s):  
Erdoo Mongol ◽  
◽  
Francisca E. Oboh-Ikuenobe ◽  
Jonathan Obrist-Farner ◽  
Alex Correa-Metrio
Keyword(s):  
Late Holocene ◽  
Vegetation History ◽  
History Of

scholarly journals Current understanding on the Cambrian Explosion: questions and answers

PalZ ◽  
2021 ◽  
Author(s):  
Xingliang Zhang ◽  
Degan Shu
Keyword(s):  
Environmental Changes ◽  
Size Variation ◽  
Progressive Increase ◽  
Cambrian Explosion ◽  
Time Interval ◽  
Early Cambrian ◽  
Ecological Processes ◽  
Questions And Answers ◽  
Evolutionary Event ◽  
History Of

AbstractThe Cambrian Explosion by nature is a three-phased explosion of animal body plans alongside episodic biomineralization, pulsed change of generic diversity, body size variation, and progressive increase of ecosystem complexity. The Cambrian was a time of crown groups nested by numbers of stem groups with a high-rank taxonomy of Linnaean system (classes and above). Some stem groups temporarily succeeded while others were ephemeral and underrepresented by few taxa. The high number of stem groups in the early history of animals is a major reason for morphological gaps across phyla that we see today. Most phylum-level clades achieved their maximal disparity (or morphological breadth) during the time interval close to their first appearance in the fossil record during the early Cambrian, whereas others, principally arthropods and chordates, exhibit a progressive exploration of morphospace in subsequent Phanerozoic. The overall envelope of metazoan morphospace occupation was already broad in the early Cambrian though it did not reach maximal disparity nor has diminished significantly as a consequence of extinction since the Cambrian. Intrinsic and extrinsic causes were extensively discussed but they are merely prerequisites for the Cambrian Explosion. Without the molecular evolution, there could be no Cambrian Explosion. However, the developmental system is alone insufficient to explain Cambrian Explosion. Time-equivalent environmental changes were often considered as extrinsic causes, but the time coincidence is also insufficient to establish causality. Like any other evolutionary event, it is the ecology that make the Cambrian Explosion possible though ecological processes failed to cause a burst of new body plans in the subsequent evolutionary radiations. The Cambrian Explosion is a polythetic event in natural history and manifested in many aspects. No simple, single cause can explain the entire phenomenon.

Environmental evolution and anthropogenic forcing in the Garigliano coastal plain (Italy) during the Holocene

The Holocene ◽  
2021 ◽  
pp. 095968362110032
Author(s):  
Halinka Di Lorenzo ◽  
Pietro Aucelli ◽  
Giuseppe Corrado ◽  
Mario De Iorio ◽  
Marcello Schiattarella ◽  
...  
Keyword(s):  
Human Activity ◽  
Coastal Plain ◽  
Forest Cover ◽  
Environmental Changes ◽  
Pollen Data ◽  
Human Environment ◽  
The Holocene ◽  
Natural Processes ◽  
History Of ◽  
The Rich

The Garigliano alluvial-coastal plain, at the Latium-Campania border (Italy), witnessed a long-lasting history of human-environment interactions, as demonstrated by the rich archaeological knowledge. With the aim of reconstructing the evolution of the landscape and its interaction with human activity during the last millennia, new pollen results from the coastal sector of the Garigliano Plain were compared with the available pollen data from other nearby sites. The use of pollen data from both the coastal and marine environment allowed integrating the local vegetation dynamics within a wider regional context spanning the last 8000 years. The new pollen data presented in this study derive from the analysis of a core, drilled in the coastal sector, which intercepted the lagoon-marshy environments that occurred in the plain as a response to the Holocene transgression and subsequent coastal progradation. Three radiocarbon ages indicate that the chronology of the analyzed core interval ranges from c. 7200 to c. 2000 cal yr BP. The whole data indicate that a dense forest cover characterized the landscape all along the Prehistoric period, when a few signs of human activity are recorded in the spectra, such as cereal crops, pasture activity and fires. The main environmental changes, forced by natural processes (coastal progradation) but probably enhanced by reclamation works, started from the Graeco-Roman period and led to the reduction of swampy areas that favoured the colonisation of the outer plain.

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