Pollen analysis of 2 cores from the Lake Sinnda, located in one of the driest areas of the southern Congo, reveals a history of vegetation and climate in this region during the past 5000 yr. A major change centered around 3000-2500 yr B.P
. is indicated by an abrupt decrease in forest pollen and by a corresponding increase in grassland pollen. Concurrent drying up of the lake shows that climate, in particular aridity, was the major cause of this change. The aridity predates agriculture marked
A 12,500-yr pollen record from Loon Lake, Wyoming provides information on the climate history of the southwestern margin of Yellowstone National Park. The environmental reconstruction was used to evaluate hypotheses that address spatial variations
Data from pollen, plant macrofossils, diatoms, mollusks, and fish bones and scales are combined with geologic data to provide the most detailed Holocene record yet available for the southern Colorado Plateau.
The application of the most recent techniques of pollen extraction allows a sufficient number of pollen grains to be obtained from stalagmites and to construct pollendiagrams based on a significant number of grains. The transport of pollen through
fissured calcareous rocks, by infiltrating water, produces pollen assemblies which reflect the development of the local vegetation. The growth of the stalagmites is not restricted to interglacials: among the six stalagmites studied, three were formed during
The aim of this study is to compare the modern Amazon River pollen discharge and terrestrial fossil pollen records with high-resolution fossil pollen and stable isotope records from the Amazon Fan so as to reconstruct the vegetation of the Amazon
The AA. present here the first pollen data from Albania. They come from lacustrine and peat deposits cored in former Lake Maliq in the Korçë basin at an altitude of 818 m. When compared with other pollen sites in northwestern Greece, the Maliq
pollen data allow the completion of an altitudinal transect between 285 and 1800 m and provide a new interpretation involving the composition and subsequent development of ecosystems at middle altitude in the Balkans for the past 12,000 years.
Multiple linear regression of modern climate and pollen data allows the development of statistical calibration functions that transform percentages of certain pollen types into quantitative estimates of climatic variables, and these functions, when
applied to Holocene pollen data, yield estimates of climatic variables for past times. We outline the steps to be followed in calculating calibration functions. We used available computer programs for most of this study. In addition, we developed new
software to compute the Moran statistic to test for spatial autocorrelation among the regression residuals, using the dual of the Voronoi diagram to describe the spatial relationships among the sites. In order to illustrate the sequence of procedures, we
used data from the lower peninsula of Michigan to develop a calibration function for July mean temperature and then used Holocene pollen data from central lower Michigan to estimate past temperatures.
High-resolution pollen record from core KW31, Gulf of Guinea, documents of the history of the lowland forests of West Equatorial Africa since 40,000 yr ago
Africa ; Atlantic Ocean ; Biodiversity ; Forest ; Marine sediment ; Palaeo-environment ; Palynology ; Pollendiagram ; Quaternary ; Stratigraphy ; West Africa
The aims of this paper are to present a new pollen record from the eastern Equatorial Atlantic and to synthesize pollen data from the adjacent continent in order to contribute to the debate on the evolution of the West African forest ecosystems
during the last glacial period and the Holocene, and on its relationship with the regional climate. Core KW31 pollen content is discussed taking into account the difference transport agents to the ocean (water and wind). It is compared to the freshwater
Etude de la palynologie des tills et des sédiments glaciolacustres dans 10 sites du sud de l'Ontario, afin de comparer le contenu en pollens de dépôts glacigéniques d'âges différents.
C14 dating ; Glaciation ; New Zealand ; North Island ; Palaeobotany ; Palaeogeography ; Palynology ; Pollendiagram ; Quaternary
Datation C 14 ; Diagramme pollinique ; Glaciation ; North Island ; Nouvelle-Zélande ; Palynologie ; Paléoflore ; Paléogéographie ; Quaternaire
Pollendiagrams and radiocarbon dates from two last glacial and postglacial (Aranuian) sites on the Aupouri Peninsula in the far north of New Zealand are compared with other published palynological and plant macrofossil evidence from the region
Biodiversity ; Central Europe ; Climatic variation ; Czech Republic ; Europe ; Holocene ; Mountain ; Palaeobiogeography ; Palynology ; Poland ; Pollendiagram ; Quaternary ; Tree line
Biodiversité ; Diagramme pollinique ; Europe ; Europe centrale ; Holocène ; Limite supérieure de la forêt ; Montagne ; Palynologie ; Paléobiogéographie ; Pologne ; Quaternaire ; Tchèque république ; Variation climatique
This study aims at summarising the development of the timberline position in the Hercynian mountains of Central Europe based on detailed interpretation of the previously published data (Vosges, Schwarzwald, Harz) and on newly constructed pollen
diagrams from Krkonoše and Hrubý Jeseník profiles.
A high altitude pollendiagram from Mount Kenya: its implications for the history of glaciation in Palaeoecology of Africa and the surrounding islands. Volume 14.
Afrique ; Diagramme pollinique ; Etage afro-alpin ; Glaciation ; Géographie de l'Afrique ; Hobley Valley ; Holocène ; Kenya ; Mont Kenya ; Montagne ; Palynologie ; Quaternaire zone chaude ; Zone intertropicale
This paper will describe the late glacial and Holocene pollen and vegetation record from Poets Hill Lake and compare the results with the other sites from varying altitudes in the same region. This comparison suggests that the development of pollen
The AA. discuss the vertebrate remains recovered from Epiguruk, review the 1967-1969 pollen data and new pollen spectra, and briefly present the few additional fossil determinations available from the bluff. The data show that the Epiguruk area
Pollen analysis of sediment cores from Grandfather and Ongivinuk Lakes reveals a record of postglacial vegetation and climate change in the northern Bristol Bay region. The chronology is based on six conventional 14C dates of bulk organic matter
from the Grandfather core. The unique features of these pollen records emphasize the spatial complexity of late Quaternary vegetation and climate history in eastern Beringia.