Identification of Marine Chroococcoid Cyanobacteria by Immunofluorescence

2013 ◽  
pp. 208-229 ◽  
Author(s):  
Lisa Campbell
Keyword(s):  
Chroococcoid Cyanobacteria

The distribution and abundance of viruses in the Southern Ocean during spring

2000 ◽  
Vol 12 (4) ◽  
pp. 414-417 ◽  
Author(s):  
Harvey Marchant ◽  
Andrew Davidson ◽  
Simon Wright ◽  
John Glazebrook
Keyword(s):  
Southern Ocean ◽  
Sea Ice ◽  
Surface Waters ◽  
Significant Relationship ◽  
Polar Front ◽  
Open Ocean ◽  
Bacterial Concentration ◽  
Viral Abundance ◽  
Chroococcoid Cyanobacteria ◽  
Bacterial Concentrations

The concentrations of viruses, bacteria, chroococcoid cyanobacteria and chlorophyll a were determined in surface waters of the Southern Ocean during spring. Viral concentrations declined southward from around 4 × 106 ml−1 near Tasmania to a minimum of around 1 × 106 ml−1 at the Polar Front. South of the Front, virus concentrations increased again, reaching around 4 × 106 ml−1 in the sea-ice zone south of 60°S. Bacterial concentration decreased southwards across the Southern Ocean from around 6.5 × 105 ml−1 near Tasmania to < 1.0 × 105 ml−1 in the sea-ice zone. Cyanobacteria accounted for < 8% of the prokaryotes. There was no significant relationship between viral abundance and eithercyanobacterial or chl a concentration. Viral and bacterial concentrations were not significantly correlated north (P {0.10 < r < 0.20}) or south (P {0.20 < r < 0.5}) of the Polar Front. The virus to bacteria ratio (VBR) was between 3 and 15 in the open ocean but varied between 15 and 40 in the sea-ice region. These virus concentrations and VBRs indicate that viruses are no less important in Southern Ocean ecosystems than elsewhere in the world's oceans.

Characterization of Cyanobacterial Picoplankton in Lake Ontario by Transmission Electron Microscopy

1987 ◽  
Vol 44 (12) ◽  
pp. 2173-2177 ◽  
Author(s):  
Gary G. Leppard ◽  
Dina Urciuoli ◽  
F. R. Pick
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cell Envelope ◽  
Lake Ontario ◽  
Nuclear Material ◽  
Major Type ◽  
Type I ◽  
Transmission Electron ◽  
Numerous Cell ◽  
Chroococcoid Cyanobacteria

Many chroococcoid cyanobacteria from Lake Ontario, characterized by epifluorescence in concert with transmission electron microscopy, had a Type I ultrastructure, the major type in oceanic waters. Such cells had a multilayered cell envelope and their polyhedral bodies were interspersed with the central nuclear material. All thylakoids were peripheral and were arranged concentrically, with no intrusion into the nuclear region. Related chroococcoid types were also seen but these were much less abundant. The most numerous cell type in all water samples was a small, Gram-negative, rodlike bacterium. Many of these rods were sufficiently small to pass a filter of 0.45-μm pore size but none had a diameter less than 0.2 μm. Attempts to isolate and describe the cyanobacterial picoplankton presented some unusual difficulties having a potential to mislead limnological analyses. These are described and, to some extent, they are resolved here.

The seasonal abundance, vertical distribution, and relative microbial biomass of chroococcoid cyanobacteria at a station in southern California coastal waters

1981 ◽  
Vol 27 (12) ◽  
pp. 1341-1344 ◽  
Author(s):  
D. W. Krempin ◽  
C. W. Sullivan
Keyword(s):  
Microbial Biomass ◽  
Vertical Distribution ◽  
Coastal Waters ◽  
Southern California ◽  
Total Population ◽  
Standing Stock ◽  
Seasonal Abundance ◽  
Photic Zone ◽  
Early Fall ◽  
Chroococcoid Cyanobacteria

The standing stock of autofluorescent chroococcoid cyanobacteria (1 μm in diameter) paralleled the seasonal trends of phytoplankton and bacterioplankton at a station in southern California coastal waters. Low winter levels increased through the summer to peak levels in the early fall. The greatest number of autofluorescent cells was found within the top 30 m of the photic zone(0.1 × 107 to 7 × 107 cells∙L−1). Numerically, autofluorescent cells accounted for 3% of the total population of prokaryotes, while accounting for 20% of the total prokaryotic biomass. With respect to the total microbial (0.2–203 μm) biomass, the bacterioplankton averaged 5%; autofluorescent cells averaged 1%, with phytoplankton accounting for the remaining 94%.

scholarly journals Identification and Enumeration of Marine Chroococcoid Cyanobacteria by Immunofluorescence

1983 ◽  
Vol 46 (3) ◽  
pp. 553-559 ◽  
Author(s):  
Lisa Campbell ◽  
Edward J. Carpenter ◽  
Vincent J. Iacono
Keyword(s):  
Chroococcoid Cyanobacteria

CHROOCOCCOID CYANOBACTERIA IN LAKE ONTARIO: VERTICAL AND SEASONAL DISTRIBUTIONS DURING 19821

2004 ◽  
Vol 21 (1) ◽  
pp. 171-175 ◽  
Author(s):  
David A. Caron ◽  
Francis R. Pick ◽  
David R. S. Lean
Keyword(s):  
Lake Ontario ◽  
Chroococcoid Cyanobacteria

Importance of Picoplankton in Lake Superior

1986 ◽  
Vol 43 (1) ◽  
pp. 235-240 ◽  
Author(s):  
Gary L. Fahnenstiel ◽  
Linda Sicko-Goad ◽  
Donald Scavia ◽  
Eugene F. Stoermer
Keyword(s):  
Primary Production ◽  
Lake Superior ◽  
Size Class ◽  
Eukaryotic Cells ◽  
Size Fractionation ◽  
Mean Size ◽  
Total Primary Production ◽  
Chroococcoid Cyanobacteria ◽  
Pass Through ◽  
Track Autoradiography

In Lake Superior, approximately 50% of total primary production is attributable to phytoplankton that pass through a 3-μm screen. The <3-μm size class is dominated by eukaryotic flagellates, nonmotile eukaryotic cells (1 μm), and chroococcoid cyanobacteria. Approximately 20% of total primary production is attributable to orange autofluorescent chroococcoid cyanobacteria (mean size = 0.7 μm) as determined by size fractionation and track autoradiography. These small prokaryotes exhibited abundances of 42 000 and 56 000 cells∙ml−1, maximum photosynthetic rates of 7 and 6 fg∙cell−1∙h−1, and growth rates of 1.5 and 0.8∙d−1 in the epilimnion and hypolimnion, respectively. A significant portion of this picoplankton (<1 μm) production may be consumed by heterotrophic protozoans in a "microbial loop."

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