Picocyanobacterial community structure and space-time dynamics in the subalpine Lake Maggiore (N. Italy)

Callieri, Cristiana; Caravati, Emanuele; Corno, Gianluca; Bertoni, Roberto

doi:10.4081/jlimnol.2012.e9

Cited by 30 publications

(21 citation statements)

References 43 publications

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“…Callieri et al . () recently reported that both pH and temperature had a significant influence on the picocyanobacterial structure in Lake Maggiore. Our statistical analysis did not pick out the importance of these factors in this study, which revealed the rather complex influence of biotic and abiotic parameters, which could explain around 60% of the dynamics of the community structure of picocyanobacteria, in both lakes.…”

Section: Discussionmentioning

confidence: 97%

Temporal dynamics and structure of picocyanobacteria and cyanomyoviruses in two large and deep peri-alpine lakes

Zhong¹,

Berdjeb

Jacquet³

2013

FEMS Microbiol Ecol

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We conducted a 1-year survey of the surface waters of two deep peri-alpine lakes, and investigated the abundances and community structure of picocyanobacteria and co-occurring cyanomyophages. Picocyanobacterial abundances ranged between 4.5 × 10(4) and 1.6 × 10(5) cells mL(-1) in Lake Annecy vs. 2.2 × 10(3) and 1.6 × 10(5) cells mL(-1) in Lake Bourget. Cyanomyoviruses ranged between 2.8 × 10(3) and 3.7 × 10(5) copies of g 20 mL(-1) in Lake Annecy vs. between 9.4 × 10(3) and 9.4 × 10(5) copies of g 20 mL(-1) in Lake Bourget. The structures of picocyanobacteria and cyanomyoviruses differed in the two lakes, and a more pronounced dynamic pattern with greater seasonality was observed in Lake Bourget. At the annual scale, there was no relationship between cyanomyovirus and picocyanobacterial abundances or structures, but we could observe that abundances of the two communities covaried in spring in Lake Bourget. We showed that (i) the changes of picocyanobacteria and cyanomyoviruses were caused by the combined effect of several environmental and biological factors the importance of which differed over time and between the lakes, and (ii) the viral control of the picocyanobacterial community was probably relatively weak at the scale of the investigation.

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Section: Discussionmentioning

confidence: 97%

Temporal dynamics and structure of picocyanobacteria and cyanomyoviruses in two large and deep peri-alpine lakes

Zhong¹,

Berdjeb

Jacquet³

2013

FEMS Microbiol Ecol

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“…Temperature is an important factor, probably acting as a primary factor driving host growth, temporal changes in host availability and viral decay, thereby acting directly and indirectly on viral community structure [6]. Phosphorus is a limiting nutrient for both autotrophs and heterotrophs in oligotrophic lakes such as Lake Annecy, and is seasonally depleted even in Lake Bourget.…”

Section: Discussionmentioning

confidence: 99%

Structure and diversity of ssDNA Microviridae viruses in two peri-alpine lakes (Annecy and Bourget, France)

Zhong¹,

Guidoni²,

Jacas³

et al. 2015

Research in Microbiology

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Microviridae is a subset of single-stranded DNA (ssDNA) viruses infecting bacteria. This group of phages has been previously observed to be very abundant (representing >90% of the total known viral metagenomic sequences) in Lake Bourget. However, this observation was made only during one period (in summer) and from a single sample collected at a single depth (near surface). This result suggests the importance of these viruses, poorly examined thus far, especially in fresh waters. In this study, performed on the two largest natural lakes in France (e.g. Lakes Annecy and Bourget), Microviridae structure was determined each month throughout the year (2011) using PCR-DGGE, with primers that target the major-capsid-protein-encoding gene VP1; cloning/sequencing was used to investigate their diversity. Our results confirm that Microviridae are diverse in peri-alpine lakes and are mainly represented by gokushoviruses. We also found for the first time ssDNA viruses belonging to Alpavirinae, another subfamily within Microviridae recently proposed by Krupovic and Forterre (2011), generally prophages infecting members of the Phylum Bacteroidetes. Our data also support highly variable community composition and dynamics of individual components whose patterns were different between lakes, suggesting distinct host communities and/or abiotic influences between the two ecosystems. We point out that most of the major observed ssDNA Microviridae viruses display boom-bust patterns (with a sharp increase/decline) in their dynamics, with high relative abundances, suggesting brutal control of hosts and rapid regulation of the host community structure.

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“…2) with higher concentrations detected within the first 20 cm . The microbiology of the lake remains a black-box, particularly compared to well characterized microbial communities of other alpine (Callieri et al, 2006) and subalpine lakes in the area (Callieri et al, 2007(Callieri et al, , 2012Bertoni et al, 2010).…”

Section: Lake Orta An Ideal Case Study?mentioning

confidence: 99%

Co-selection of antibiotic and heavy metal resistance in freshwater bacteria

2016

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Picocyanobacterial community structure and space-time dynamics in the subalpine Lake Maggiore (N. Italy)

Abstract: We investigated the community structure of freshwater picocyanobacteria (Pcy)

Cited by 30 publications

References 43 publications

Temporal dynamics and structure of picocyanobacteria and cyanomyoviruses in two large and deep peri-alpine lakes

Temporal dynamics and structure of picocyanobacteria and cyanomyoviruses in two large and deep peri-alpine lakes

Structure and diversity of ssDNA Microviridae viruses in two peri-alpine lakes (Annecy and Bourget, France)

Co-selection of antibiotic and heavy metal resistance in freshwater bacteria

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