Results 91 to 100 of about 398,539 (299)

Monitoring the fluvial palynomorph load in a lowland temperate catchment and its relationship to suspended sediment and discharge [PDF]

, 2008
Despite it being a component of the seston we know very little about fluvial (waterborne) pollen and spore (palynomorph) transport. This paper presents the results of a monitoring programme conducted over two years and at a catchment scale in South West ...
Walling, D.E., Brown, A.G., Carpenter, R.G.   +2 more
core   +1 more source

Responses of primary producers, anoxia, and chemical feedback to Late Glacial climate change: Insights from a paired lake approach

Journal of Quaternary Science, EarlyView.
Abstract Worldwide, lacustrine ecosystems are threatened by eutrophication and deoxygenation. Both processes are driven by the combined effects of human activities and climate change. Understanding the pre‐anthropogenic nexus between warming, eutrophication, deoxygenation, and related feedback is essential to determine how lakes respond to rapid ...
Noé R.M.M. Schmidhauser, Stan J. Schouten, Petra Zahajská, Andrea Lami, Jacqueline F.N. van Leeuwen, Rik Tjallingii, Hendrik Vogel, Martin Grosjean   +7 more
wiley   +1 more source

Practical and cost-effective method for the isolation of pollen grains from various sources

Acta Palaeobotanica
Mock standards, with known concentrations and varied characteristics, when analyzed alongside unknown samples, can provide evaluation, optimization, and validation of scientific methods.
Ozge S. Kuddar, Benjamin J. Callahan, Christopher Bernhardt, Kelly A. Meiklejohn   +3 more
doaj   +1 more source

Pollen morphology of Curroria, Mondia, Socotranthus and Stomatostemma (Periplocaceae)

Bothalia: African Biodiversity & Conservation, 1993
The pollen morphology of I Planch., O Skeels, Socotranthus Kuntze and Stomatostemma N.E. Br. was studied.All the genera are characterized by pollen grains arranged in tetrads. The arrangement of the grains may be rhomboidal, tetrahedral or decussate. The
R. L. Verhoeven, H. J. T. Venter
doaj   +1 more source

Mercury cycling during the last glacial period in Arctic Lake El'gygytgyn, NE Russia

Journal of Quaternary Science, EarlyView.
ABSTRACT Tectonic processes play a key role in the global mercury (Hg) cycle on geological timescales, by mobilising Hg from deep Earth reservoirs to the surface. These natural fluxes also introduce a dynamic component to the terrestrial Hg cycle that can interact with other environmental signals and influence Hg delivery to sedimentary records.
Alice R. Paine, Joost Frieling, Bernd Wagner, Martin Melles, Volker Wennrich, Tamsin A. Mather, Stuart A. Robinson, David M. Pyle   +7 more
wiley   +1 more source

Carbon isotope geochemistry of organic matter in volcanic paleosols constrains paleo‐environmental variations

Journal of Quaternary Science, EarlyView.
ABSTRACT The Fiorano quarry paleosol developed within the Colli Albani volcanic district (Italy) in the time interval bracketed by the deposition of the Pozzolanelle pyroclastic‐flow unit (365 ± 4 ka) and the emplacement of the Capo di Bove lava flow (277 ± 2 ka).
Eduardo Di Marcantonio, Luca Aldega, Luigi Dallai, Mario Gaeta, Fabrizio Marra   +4 more
wiley   +1 more source

MICROMORPHOLOGY CHARACTERIZATION POLLEN GRAINS OF SUBGENERA PRUNUS AND CERASUS (ROSACEAE) IN KURDISTAN REGION-IRAQ

The Iraqi Journal of Agricultural science
This investigation was aimed to study pollen grains of subgenera Prunus and Cerasus. The polleniferous materials were collected from different places of Kurdistan region of Iraq living specimens.
Ameena M. Hasan, Saleem E. Shahbaz, Shamiran S. Abdulrahman   +2 more
doaj   +1 more source

New constraints on the postglacial evolution of Lago Maggiore, Northern Italy

Journal of Quaternary Science, EarlyView.
ABSTRACT Lago Maggiore is situated in an overdeepened valley reach at the southern margin of the European Alps, and its thick sediment infill allows the reconstruction of the postglacial valley and lake evolution. We study here the sedimentary succession in the lower Ossola Valley, which is infilled by ~500 m of deposits. In a marginal position, a core
Lukas Gegg, Alexander Fülling, Andrew Greenwood, György Hetényi, F. Martin Hofmann, Giovanni Monegato, Jahir S. Rangel Herrera, Camille Schirra, Marco Venier, Othmar Müntener   +9 more
wiley   +1 more source

Airborne pollen grains of Afyon, Turkey

, 2021
The airborne pollen grains of Afyon have been studied for a two-year period (1999 - 2000) with a Durham sampler. A total of 14 367 pollen grains belonging to 40 taxa. have been identified and recorded with some unidentified ones.
Tatlidil, S, Malyer, H, Akkaya, A, Ergun, S, Ozyurt, S, Bicakci, A, Sapan, N   +6 more
core  

Observations and modelling of birch pollen emission and dispersion from an isolated source [PDF]

, 2014
The occurrence of allergic diseases in western countries increased during the last decades due to greater awareness towards a hygienic lifestyle. The hygiene hypothesis relates the reduced expo- sure to microbial pollution to an underdevelopment of the
Michel, Dominik
core   +1 more source