scholarly journals Distribution of heterotrophic bacteria and virus-like particles along a salinity gradient in a hypersaline coastal lagoon

2009 ◽  
Vol 54 (2) ◽  
pp. 171-183 ◽  
Author(s):  
M Schapira ◽  
MJ Buscot ◽  
SC Leterme ◽  
T Pollett ◽  
C Chapperon ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Heterotrophic Bacteria ◽  
Salinity Gradient ◽  
Virus Like Particles ◽  
Hypersaline Coastal Lagoon

scholarly journals Prokaryotic aminopeptidase activity along a continuous salinity gradient in a hypersaline coastal lagoon (the Coorong, South Australia)

2010 ◽  
Vol 6 (1) ◽  
pp. 5 ◽  
Author(s):  
Thomas Pollet ◽  
Mathilde Schapira ◽  
Marie-Jeanne Buscot ◽  
Sophie C Leterme ◽  
James G Mitchell ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Salinity Gradient ◽  
South Australia ◽  
Aminopeptidase Activity ◽  
Hypersaline Coastal Lagoon

scholarly journals Flow cytometric analysis of virus-like particles and heterotrophic bacteria within coral-associated reef water

2006 ◽  
Vol 86 (3) ◽  
pp. 563-566 ◽  
Author(s):  
Nicole L. Patten ◽  
Justin R. Seymour ◽  
James G. Mitchell
Keyword(s):  
Flow Cytometry ◽  
Bacterial Community ◽  
Heterotrophic Bacteria ◽  
Flow Cytometric Analysis ◽  
Water Layer ◽  
Dead Coral ◽  
Overlying Water ◽  
Virus Like Particles ◽  
Flow Cytometric ◽  
Diseased Coral

Using flow cytometry, two distinct populations of virus-like particles (VLP) and heterotrophic bacteria were defined within the 12 cm water layer immediately overlying healthy, diseased and dead acroporid corals. Bacterial abundances were similar in overlying water for all coral types, however, VLP were 30% higher above diseased corals than healthy or dead corals. Mean virus to bacteria ratios (VBR) were up to 30% higher above diseased corals than above healthy or dead coral or in distant water. Concomitant with increasing VLP concentrations within 5 cm of coral surfaces, VBR distributions were generally highest above healthy and diseased coral and depressed above dead coral. These results suggest fundamental shifts in the VLP and bacterial community in water associated with diseased corals.

Abundance and biomass of prokaryotic and eukaryotic microorganisms coupled with environmental factors in an arid multi-pond solar saltern (Sfax, Tunisia)

2008 ◽  
Vol 89 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Jannet Elloumi ◽  
Wassim Guermazi ◽  
Habib Ayadi ◽  
Abderrahmen Bouain ◽  
Lotfi Aleya
Keyword(s):  
Environmental Factors ◽  
Large Range ◽  
Heterotrophic Bacteria ◽  
Dominant Role ◽  
Salinity Gradient ◽  
Solar Saltern ◽  
Eukaryotic Microorganisms ◽  
Crystallizer Pond ◽  
Quantitative Importance

The distribution of abundance and biomass of prokaryotes, flagellates, ciliates and phytoplankton, were studied in five ponds of increasing salinity in the Sfax solar saltern (Tunisia) coupled with environmental factors. The results showed that abundance of eukaryotic microorganisms decreased with increasing salinity of the ponds whereas prokaryotes (heterotrophic bacteria and Archaea) were abundant in the hyper-saline ponds. Phototrophic picoplankton was found in a large range of salinity values (70 and 200‰). Phototrophic non-flagellated nanoplankton which dominated in the first sampled pond was substituted by phototrophic flagellated nanoplankton in the other ponds. Heterotrophic nanoplankton dominated in the crystallizer pond but its quantitative importance declined in the less saline ponds. Diatoms and dinoflagellates were the major contributors to phytoplankton abundance in the first ponds (>90% of total abundance). Ciliated protozoa were found in all the ponds except in the crystallizer in which prokaryotes proliferated. Oligotrichida and Heterotrichida were the most abundant ciliate groups. Overall, species richness decreased with salinity gradient. We propose a simplified diagram of the Sfax saltern's food web showing the dominant role of the microbial loop along the salinity gradient.

scholarly journals Dynamics of various viral groups infecting autotrophic plankton in Lake Geneva

2012 ◽  
Vol 3 (2) ◽  
pp. 171 ◽  
Author(s):  
Ammini Parvathi ◽  
Xu Zhong ◽  
Stéphan Jacquet
Keyword(s):  
Carbon Fixation ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Heterotrophic Bacteria ◽  
Significant Proportion ◽  
Late Summer ◽  
Lake Geneva ◽  
Tight Coupling ◽  
Virus Like Particles ◽  
Signature Genes ◽  
Gradient Gel Electrophoresis

Viral community structure and dynamics were investigated for the first time in surface waters (0–20 m) of Lake Geneva over a 5-month period between July and November 2011. Abundances of autotrophic picoplankton, heterotrophic bacteria and virus-like particles determined using flow cytometry revealed their predominance during the summer months followed by a slight decrease in fall. Two groups of viruses could be discriminated, referred to as virus-like particles (VLP) group 1 and 2. The abundance of VLP1 correlated significantly with the bacterial abundance, while that of VLP2 correlated with both chlorophyll a and picocyanobacterial abundance suggesting a tight coupling between these viral groups and bacteria or phytoplankton. The abundance of cyanomyoviruses and cyanopodoviruses varied between 7.3 × 102 ml−1 (July) to 1.2 × 104 ml−1 (November) and 5.8 × 103 ml−1 (July) to 2.2 × 104 ml−1 (September), respectively. The abundance of the picocyanobacterial hosts was in concurrence with that of the cyanophages, being higher in late summer. Polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) of viral signature genes such as g20, g23, mcp, polB, psbA and psbD revealed a relatively high richness within these genes with their diversity increasing towards the summer months. The diversity of psbD was found to be particularly high and correlated with picocyanobacterial abundance suggesting that cyanophages may be directly responsible for a significant proportion of carbon fixation in Lake Geneva.

Mollusk distribution in four habitats along a salinity gradient in a coastal lagoon from the Gulf of Mexico

2020 ◽  
Vol 54 (19-20) ◽  
pp. 1257-1270
Author(s):  
Rosa María De Jesús-Carrillo ◽  
Frank A. Ocaña ◽  
Iván Hernández-Ávila ◽  
Manuel Mendoza-Carranza ◽  
Alberto J. Sánchez ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Coastal Lagoon ◽  
Salinity Gradient
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