Postglacial history of vegetation, human activity and lake-level changes at Jezioro Linówek in northeast Poland, based on multi-proxy data

The postglacial history of vegetation in the Yale area of the lower Fraser River Canyon is described from sediments of two lakes using percentage pollen analysis supplemented with macrofossil evidence and radiocarbon dating. Deposition of postglacial sediments, ranging from basal clays to gyttjas, began about 11 500 y B.P. Three distinct pollen assemblage zones are distinguished, reflecting in part the main climatic conditions for the intervals. The oldest zone, with high percentages of pine (Pinus) and alder (Alnus) pollen, suggests cool and moist conditions following withdrawal of glacial ice. This is followed by marked increases in Douglas-fir (Pseudotsuga), grasses and other nonarboreal pollen, suggesting in part, warmer and drier conditions. The third zone, ranging from about the Mt. Mazama ash at 6600 y B.P. to the present, is marked by high alder and Douglas-fir, and increasing cedar (Thuja-Chamaecyparis type), western hemlock (Tsuga heterophylla), fir (Abies) and birch; an assemblage indicating a return to wetter conditions. This sequence contrasts with previously described successions that recognized the classical Hypsithermal in adjacent areas. The sequence of inferred vegetational changes, although similar to those described for the Haney area to the west, suggests that the Yale area has been a biogeoclimatically transitional area for much of postglacial time.

Download Full-text

A postglacial history of vegetation and bog formation at Point Escuminac, New Brunswick

Canadian Journal of Earth Sciences ◽

10.1139/e91-141 ◽

1991 ◽

Vol 28 (10) ◽

pp. 1572-1582 ◽

Cited By ~ 14

Author(s):

Barry G. Warner ◽

Kimmo Tolonen ◽

Mirjami Tolonen

Keyword(s):

New Brunswick ◽

Radiocarbon Dating ◽

Coniferous Forests ◽

Postglacial History ◽

History Of Vegetation ◽

Ombrotrophic Bog ◽

History Of ◽

Northern Edge ◽

Woodland Communities

Radiocarbon dating and analyses of fossils contained in peat cliffs establish the history of peatland formation and development at the northern edge of Point Escuminac, New Brunswick. A 532 cm radiocarbon-dated mineral sediment and peat sequence, the oldest of four sections studied, yielded pollen and macrofossils that record bog development from 11 000 BP. The earliest landscape was open Juniperus shrubland. Picea was the first tree to move into the area, forming woodland communities by 10 200 BP and closed coniferous forests with Abies by 9200 BP. An early counterpart of the modern Acadian forests was in place by 6500 BP and was fully developed by 2900 BP when Fagus spread through the area. Shallow freshwater, open wetland communities acted as nuclei for the development of fen near the centre of the peninsula. Transformation into an ombrotrophic bog started around 6500 BP and was completed by 4700 BP, after which time the bog spread laterally by paludification onto higher parts of the peninsula.

Download Full-text

The late glacial and early postglacial history of vegetation and climate in Northwestern Germany

Review of Palaeobotany and Palynology ◽

10.1016/0034-6667(67)90182-0 ◽

1967 ◽

Vol 4 (1-4) ◽

pp. 149-161 ◽

Cited By ~ 23

Author(s):

Karl-Ernst Behre

Keyword(s):

Late Glacial ◽

Postglacial History ◽

History Of Vegetation ◽

History Of ◽

Vegetation And Climate

Download Full-text

Ecosystem development in the Girdwood area, south-central Alaska, following late Wisconsin glaciation

Canadian Journal of Earth Sciences ◽

10.1139/e10-020 ◽

2010 ◽

Vol 47 (7) ◽

pp. 971-985 ◽

Cited By ~ 8

Author(s):

T. A. Ager ◽

P. E. Carrara ◽

J. P. McGeehin

Keyword(s):

Picea Sitchensis ◽

Coastal Forest ◽

Postglacial History ◽

South Central ◽

Tundra Vegetation ◽

History Of Vegetation ◽

Clayey Silt ◽

Birch Trees ◽

History Of ◽

Tsuga Mertensiana

Pollen analysis of two cores with discontinuous records from a peat bog near Girdwood, in south-central Alaska, provides the basis for reconstructing the first radiocarbon-dated outline of postglacial history of vegetation in the upper Turnagain Arm area of Cook Inlet. Pollen data from clayey silt underlying peat at one site indicate that the earliest known vegetation in the Girdwood area was shrub–herb tundra. Tundra vegetation developed by ∼13 800 cal years BP, soon after local retreat of glacial ice from the maximum position of the Elmendorf glacial advance (∼15 000 – 11 000 cal years BP). By ∼10 900 cal years BP, the tundra vegetation became shrubbier as Betula nana , Salix , and Ericales increased, and scattered Alnus shrubs began to colonize Turnagain Arm. By ∼9600 cal years BP, Alnus thickets with Polypodiaceae ferns became the dominant vegetation. By ∼6600 cal years BP, birch trees ( Betula neoalaskana , B. kenaica ) from the Anchorage and Kenai lowlands began to spread eastward into eastern Turnagain Arm. Mountain hemlock ( Tsuga mertensiana ) began to colonize the Girdwood area by ∼3400 cal years BP, followed soon after by Sitka spruce ( Picea sitchensis ), both Pacific coastal forest species that spread westward from Prince William Sound after a long migration from southeastern Alaska. For at least the past 2700 cal years, Pacific coastal forest composed mostly of Tsuga mertensiana , Picea sitchensis , and Alnus has been the dominant vegetation of eastern Turnagain Arm.

Download Full-text

USING VOLCANIC ASH TO CONSTRAIN THE HISTORY OF GLACIAL-INTERGLACIAL LAKE LEVEL CHANGES AT SUMMER LAKE, PLUVIAL LAKE CHEWAUCAN, OREGON

10.1130/abs/2018am-320968 ◽

2018 ◽

Author(s):

Cameron Jean McNeely ◽

◽

Stephen C. Kuehn ◽

James K. Frye ◽

Jared W. Rose

Keyword(s):

Lake Level ◽

Volcanic Ash ◽

Lake Level Changes ◽

History Of

Download Full-text

Holocene book review: Postglacial History of Vegetation in the Polish Part of the Western Carpathians Based on Isopollen Maps

The Holocene ◽

10.1177/0959683615569136 ◽

2015 ◽

Vol 25 (5) ◽

pp. 887-888

Author(s):

Ioan Tanţău

Keyword(s):

Western Carpathians ◽

Postglacial History ◽

History Of Vegetation ◽

History Of

Download Full-text

Climate and local controls of long-term vegetation dynamics in northern Patagonia (Lat 41°S)

Quaternary Research ◽

10.1016/j.yqres.2012.07.004 ◽

2012 ◽

Vol 78 (3) ◽

pp. 502-512 ◽

Cited By ~ 22

Author(s):

Virginia Iglesias ◽

Cathy Whitlock ◽

María Martha Bianchi ◽

Gustavo Villarosa ◽

Valeria Outes

Keyword(s):

Late Holocene ◽

Vegetation Change ◽

Late Glacial ◽

Fire Frequency ◽

Forest Steppe ◽

Ecological Change ◽

Postglacial History ◽

New Information ◽

History Of Vegetation ◽

History Of

AbstractPatagonian vegetation has dramatically changed in composition and distribution over the last 16,000 yr. Although patterns of vegetation change are relatively clear, our understanding of the processes that produce them is limited. High-resolution pollen and charcoal records from two lakes located at lat 41°S provide new information on the postglacial history of vegetation and fire activity at the forest–steppe ecotone, and help clarify the relative importance of local and regional drivers of late-Holocene ecological change. Our results suggest that late-glacial parkland was colonized by shrubs at ca. 11,200 cal yr BP and this vegetation persisted until 4900 cal yr BP, when increased humidity allowed for the establishment of Nothofagus forest. The late Holocene is characterized by oscillations in forest dominance largely driven by changes in humidity, possibly associated with the onset or strengthening of ENSO. In the last 4900 yr, humid periods (4900–3800 and 2850–1350 cal yr BP) have promoted Nothofagus forest, whereas drier times (3800–2850 and 1350–450 cal yr BP) have favored Austrocedrus expansion. At intermediate moisture levels, however, the lower forest supported both taxa, and fire became an important control of community composition, with severe, infrequent fires facilitating Nothofagus regeneration and high fire frequency and intensity supporting Austrocedrus.

Download Full-text

From the history of the development of electronic dictionaries: foreign and domestic experience

Humanitarian studios: pedagogics, psychology, philosophy ◽

10.31548/hspedagog2020.01.006 ◽

2020 ◽

Vol 11 (1) ◽

pp. 6-12

Author(s):

O. Y. Balalaieva ◽

Keyword(s):

Human Activity ◽

Current Level ◽

Ease Of Use ◽

Advanced Search ◽

Wide Range ◽

Promising Area ◽

History Of ◽

Machine Readable ◽

Everyday Communication ◽

Educational Professional

The purpose of the article is to study the dynamics of electronic dictionaries development abroad and in Ukraine using methods of analysis of scientific sources, comparison, generalization and systematization. Electronic dictionaries have been found to be a relatively new phenomenon in the lexicographic market, evolving from machine-readable dictionaries, exact copies of paper editions to complex digital lexicographic systems with a powerful arsenal of functions over the decades. The stages of development of autonomous and online dictionaries are described. Electronic dictionaries due to the advanced search capabilities, speed, simplicity, ease of use, accessibility and compactness have gained popularity among a wide range of users. Today they are used in many spheres of human activity – scientific, educational, professional, everyday communication. However, the analysis of the current level of development of Ukrainian electronic resources indicates a shortage of electronic dictionaries both common and terminological vocabulary. The lack of electronic dictionaries is due to a number of objective problems, both practical and theoretical, that is why research in the field of domestic computer lexicography is a promising area of further research.

Download Full-text