نتایج جستجو برای: diatoms

تعداد نتایج: 5070  

Journal: :Remote Sensing 2014
Mariana A. Soppa Takafumi Hirata Brenner Silva Tilman Dinter Ilka Peeken Sonja Wiegmann Astrid Bracher

Diatoms are the major marine primary producers on the global scale and, recently, several methods have been developed to retrieve their abundance or dominance from satellite remote sensing data. In this work, we highlight the importance of the Southern Ocean (SO) in developing a global algorithm for diatom using an Abundance Based Approach (ABA). A large global in situ data set of phytoplankton...

Journal: :American journal of botany 2009
Alexander P Wolfe Peter A Siver

The evolutionary history of diatoms is only constrained partially by the fossil record. The timing of several key events, such as initial colonization of freshwater habitats by marine taxa, remains poorly resolved. Numerous specimens of the genera Cyclotella, Discostella, and Puncticulata (Ochrophyta: Thalassiosirales) have been recovered in Middle Eocene lacustrine sediments from the Giraffe P...

2011
Riina Klais Timo Tamminen Anke Kremp Kristian Spilling Kalle Olli

The algal spring bloom in the Baltic Sea represents an anomaly from the winter-spring bloom patterns worldwide in terms of frequent and recurring dominance of dinoflagellates over diatoms. Analysis of approximately 3500 spring bloom samples from the Baltic Sea monitoring programs revealed (i) that within the major basins the proportion of dinoflagellates varied from 0.1 (Kattegat) to >0.8 (cent...

2017
Gry Mine Berg Sara Driscoll Kendra Hayashi Melissa Ross Raphael Kudela

Six species of phytoplankton recently isolated from upper San Francisco Bay were tested for their sensitivity to growth inhibition by ammonium (NH4+ ), and for differences in growth rates according to inorganic nitrogen (N) growth source. The quantum yield of photosystem II (Fv /Fm ) was a sensitive indicator of NH4+ toxicity, manifested by a suppression of Fv /Fm in a dose-dependent manner. Tw...

Journal: :caspian journal of environmental sciences 2014
s. bagheri m. fallahi

phytoplankton taxa composition of the caspian sea were evaluated by using samples collected at 12 stations along the iranian coast of the caspian sea between 1996 and 2010. this study identified 158 phytoplankton species consisted of diatoms (70 species), dinoflagellates (23 species), chlorophytes (29 species), cyanophytes (31 species), and euglenoids (5 species). the dominant species were the ...

Journal: :Nature 1947

2010
MATTHEW L. JULIUS EDWARD C. THERIOT

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Journal: :ecopersia 2015
behrouz zarei darki

the main diatomic structure-forming species of the zayandehrud reservoir was investigated by collecting samples from the surface, five, seven and 10 m depths from january 2011 to october 2012 along four linear transects. asterionella formosa hassall, cyclotella ocellata pantocsek and fragilaria crotonensis kitton were revealed as the three structure-forming species among diatomic algae in the r...

Journal: :Science 2007
Jason Pither

Telford et al. (Brevia, 19 May 2006, p. 1015) reported that freshwater diatoms exhibit regional-scale richness-pH relationships that depend substantially on regional habitat availability. On this basis, the authors argued that, despite their microscopic size, diatoms are not ubiquitously dispersed. Here, I describe my demonstration that their primary evidence against the ubiquitous dispersal hy...

2016
HISAYUKI ARAKAWA Pia Moisander

The spatial distribution of nanocyanobacteria-like cells and microphytoplankton was investigated along a ~5000 km transect in the North Western Pacific Subtropical Gyre and the Warm Pool. Three different consortia: Richelia intracellularis/Calothrix rhizosoleniae, Katagnymene spp. and Trichodesmium spp. and the associated diatoms were studied. Although colonies of Trichodesmium spp. were identi...

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