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Full-Text Articles in Life Sciences
Phytolith Analysis Of Poa Pratensis (Poaceae) Leaves, Zsuzsa Lisztes_Szabo, Szilvia Kovács, Ákos Petö
Phytolith Analysis Of Poa Pratensis (Poaceae) Leaves, Zsuzsa Lisztes_Szabo, Szilvia Kovács, Ákos Petö
Turkish Journal of Botany
Phytoliths in Poa pratensis L. (Poaceae) leaf blades and sheaths are described in this study. The role of plant opal particles-known as phytoliths-is considerable in taxonomical studies, and their long-term preservation in sediments makes them a useful tool in the reconstruction of ancient plant communities and plant-human interactions. All together, 2244 phytoliths were counted and analyzed in 25 plant samples (5 shoots of 5 specimens and approximately 500-600 phytoliths per specimen). The biogenic silica content of P. pratensis leaves was determined at 2.61%, and 27 morphotypes have been described using the International Code for Phytolith Nomenclature. Two morphotypes are described …
A Global Diatom Database- Abundance, Biovolume And Biomass In The World Ocean, K. Leblanc, J. Aristegui, L. Armand, P. Assmy, B. Becker, A. Bode, E. Breton, V. Cornet, J. Gibson, M. P. Gosselin, H. Marshall
A Global Diatom Database- Abundance, Biovolume And Biomass In The World Ocean, K. Leblanc, J. Aristegui, L. Armand, P. Assmy, B. Becker, A. Bode, E. Breton, V. Cornet, J. Gibson, M. P. Gosselin, H. Marshall
Biological Sciences Faculty Publications
Phytoplankton identification and abundance data are now commonly feeding plankton distribution databases worldwide. This study is a first attempt to compile the largest possible body of data available from different databases as well as from individual published or unpublished datasets regarding diatom distribution in the world ocean. The data obtained originate from time series studies as well as spatial studies. This effort is supported by the Marine Ecosystem Model Inter-Comparison Project (MAREMIP), which aims at building consistent datasets for the main plankton functional types (PFTs) in order to help validate biogeochemical ocean models by using carbon (C) biomass derived from …
Biologic Cycling Of Silica Across A Grassland Bioclimosequence, S. W. Blecker, Rebecca L. Mcculley, O. A. Chadwick, E. F. Kelly
Biologic Cycling Of Silica Across A Grassland Bioclimosequence, S. W. Blecker, Rebecca L. Mcculley, O. A. Chadwick, E. F. Kelly
Plant and Soil Sciences Faculty Publications
The dynamics of biologic Si cycling in grassland ecosystems are largely unknown and likely to impact mineral weathering rates regionally and diatom productivity globally; key regulatory processes in the global Si cycle are closely tied to the global carbon cycle. Across a bioclimatic sequence spanning major grassland ecosystems in the Great Plains, soil biogenic silica depth distributions are similar to that of soil organic carbon; however, unlike soil organic carbon, quantities of soil biogenic silica decrease with increasing precipitation, despite an increase in annual biogenic inputs through litterfall across the same gradient. Though comprising only 1–3% of the total Si …
Holocene Sediment Records From The Continental Shelf Of Mac. Robertson Land, East Antarctica, Peter N. Sedwick, Peter T. Harris, Lisette G. Robertson, Gary M. Mcmurtry, Maximilian D. Cremer, Philip Robinson
Holocene Sediment Records From The Continental Shelf Of Mac. Robertson Land, East Antarctica, Peter N. Sedwick, Peter T. Harris, Lisette G. Robertson, Gary M. Mcmurtry, Maximilian D. Cremer, Philip Robinson
OES Faculty Publications
Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf SMO sequences are massive dark olive green material, whereas the outer shelf SMO sequences are dark olive material interspersed with light olive green layers similar to1-10 cm thick. The biogenic material is dominated by marine diatoms including Fragilariopsis curta, Fragilariopsis cylindrus, and Chaetoceros spp. in the dark-colored SMO and Corethron criophilum in the …