scholarly journals Paraphysomonas imperforata (Protista, Chrysomonadida) under different turbulence levels:feeding, physiology and energetics

1996 ◽  
Vol 134 ◽  
pp. 235-245 ◽  
Author(s):  
F Peters ◽  
JW Choi ◽  
T Gross
Keyword(s):  
Paraphysomonas Imperforata

scholarly journals Protistan Grazing Analysis by Flow Cytometry Using Prey Labeled by In Vivo Expression of Fluorescent Proteins

2003 ◽  
Vol 69 (11) ◽  
pp. 6848-6855 ◽  
Author(s):  
Yutao Fu ◽  
Charles O'Kelly ◽  
Michael Sieracki ◽  
Daniel L. Distel
Keyword(s):  
Flow Cytometry ◽  
Prey Species ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Heterotrophic Flagellate ◽  
Broad Host Range ◽  
Bacterial Cells ◽  
Protein Markers ◽  
Significant Difference ◽  
Paraphysomonas Imperforata

ABSTRACT Selective grazing by protists can profoundly influence bacterial community structure, and yet direct, quantitative observation of grazing selectivity has been difficult to achieve. In this investigation, flow cytometry was used to study grazing by the marine heterotrophic flagellate Paraphysomonas imperforata on live bacterial cells genetically modified to express the fluorescent protein markers green fluorescent protein (GFP) and red fluorescent protein (RFP). Broad-host-range plasmids were constructed that express fluorescent proteins in three bacterial prey species, Escherichia coli, Enterobacter aerogenes, and Pseudomonas putida. Micromonas pusilla, an alga with red autofluorescence, was also used as prey. Predator-prey interactions were quantified by using a FACScan flow cytometer and analyzed by using a Perl program described here. Grazing preference of P. imperforata was influenced by prey type, size, and condition. In competitive feeding trials, P. imperforata consumed algal prey at significantly lower rates than FP (fluorescent protein)-labeled bacteria of similar or different size. Within-species size selection was also observed, but only for P. putida, the largest prey species examined; smaller cells of P. putida were grazed preferentially. No significant difference in clearance rate was observed between GFP- and RFP-labeled strains of the same prey species or between wild-type and GFP-labeled strains. In contrast, the common chemical staining method, 5-(4,6-dichloro-triazin-2-yl)-amino fluorescein hydrochloride, depressed clearance rates for bacterial prey compared to unlabeled or RFP-labeled cells.

scholarly journals Carbon utilization by the omnivorous flagellate Paraphysomonas imperforata

1990 ◽  
Vol 35 (1) ◽  
pp. 192-201 ◽  
Author(s):  
David A. Caron ◽  
Joel C. Goldman ◽  
Mark R. Dennett
Keyword(s):  
Carbon Utilization ◽  
Paraphysomonas Imperforata

Two new marine species of Paraphysomonas

1967 ◽  
Vol 47 (2) ◽  
pp. 329-334 ◽  
Author(s):  
I. A. N. Lucas
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Marine Species ◽  
Central Dome ◽  
Two New Species ◽  
Paraphysomonas Imperforata

Diagnoses and descriptions are given of two new species of marine planktonic flagellates of the class Chrysophyceae; Paraphysomonas imperforata and P. foraminifera. Both possess unequalflagella, the longer pantonemic, the shorter simple. Chromatophores and stigma are absent, phagotrophic nutrition occurring. Surface scales examined by electron microscopy are the best means of identification, those of the latter being perforated by many holes. Each scale of both species has a central dome, bearing a long spine, and a shallow annular fold with a radius half that of the scale.

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