Dynamics of prokaryotic picoplankton community in the central and southern Adriatic Sea (Croatia)

Šantić, Danijela; Krstulović, Nada; Šolić, Mladen; Ordulj, Marin; Kušpilić, Grozdan

doi:10.1007/s10152-012-0336-x

Cited by 30 publications

(23 citation statements)

References 59 publications

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“…Bacterial abundance was lower at the open than at the coastal sea station, which is consistent with the results previously found for the North [11,13] and Mid Adriatic [25,28]. Bacterial production followed a similar pattern to that of abundance, which is in accordance with previously published data for the same area [25], for the North Adriatic [13] and the Western Mediterranean Sea [16].…”

Section: Discussionsupporting

confidence: 92%

“…By using the filtration based approach for the estimation of viral decay, we might have partially underestimated viral decay rates since bacteria, suspended matter and other organic molecules are removed during the process, and other physical factors such as UV radiation, were not considered either. However, we did observe different rates at the coastal and open sea stations, which were characterized by different trophic conditions [28]; therefore, our data can be considered, although they need to be confirmed by other approaches and methods of analysis.…”

Section: Discussionmentioning

confidence: 57%

“…Parrika et al [51] noted that in the open and offshore waters, in less productive waters generally, VBR values are higher than in the usual eutrophic coastal waters, mostly because of vivory (grazing by the HNF), adsorption by particulate matter, degradation by heat-labile organic matter, UV radiation and temperature. Since the coastal station in this study is not eutrophic, but rather mesotrophic [28], similarities in VBR are expected. Lower than average VBR values were observed at the coastal-sea station during February at the bottom, and July in the surface layer, which might have been caused by low temperature and high UV radiation, respectively.…”

Section: Discussionmentioning

confidence: 87%

“…The coastal sea station is located in Kaštela Bay, which is under the influence of the karstic river Jadro and is mesotrophic, whereas the open-sea station is located near the island of Vis, and is characterized as oligotrophic [28] (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

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Viral dynamics in two trophically different areas in the Central Adriatic Sea

et al. 2017

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To understand the activity of marine viruses, experiments on viral production, viral decay and the percentage of lytic and lysogenic bacterial cells among the total number of bacterial cells were carried out seasonally at two stations in the Adriatic Sea with different trophic conditions. Additionally, we are providing an insight on the enrichment with dissolved and particulate organic matter by viral lysis in the studied area. Viral production was higher at the coastal station than at the open-sea station. Viral decay rates were also higher at the coastal sea station than at the open-sea station, and accounted for approximately 40% of viral production at both investigated stations. The percentage of lysogenic infection was lower than that of lytical infection, which indicates the prevalence of the lytic cycle at both stations. Viruses had a significant influence on bacterial mortality through high daily removal of the bacterial standing stock at the coastal and open-sea station. The viruses contributed to the restoration of dissolved organic carbon, nitrogen and phosphorus in the microbial loop by lysing the bacterial cells at the studied stations. All the above suggest that viruses are important in the microbial food web and an important factor in the control of bacterial populations within the study area.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

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Viral dynamics in two trophically different areas in the Central Adriatic Sea

et al. 2017

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“…Therefore, we performed the first thorough characterization of the microbial diversity in Lake Rogoznica under both stratified and mixed conditions. We hypothesized that during stratification, the microbial community in the epilimnion resembles communities in the photic zone of the adjacent Adriatic Sea, with Synechococcus-Prochlorococcus-type Cyanobacteria and SAR11 clade-related Alphaproteobacteria being the dominant bacterioplankton (26,28,29). In anoxic waters and underlying sediments, a microbial community with sulfate-reducing potential was predicted based on observed sulfur isotope fractionation values (21).…”

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confidence: 99%

Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake

Pjevac

Korlević

Berg

et al. 2015

Appl Environ Microbiol

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f Most stratified sulfidic holomictic lakes become oxygenated after annual turnover. In contrast, Lake Rogoznica, on the eastern Adriatic coast, has been observed to undergo a period of water column anoxia after water layer mixing and establishment of holomictic conditions. Although Lake Rogoznica's chemistry and hydrography have been studied extensively, it is unclear how the microbial communities typically inhabiting the oxic epilimnion and a sulfidic hypolimnion respond to such a drastic shift in redox conditions. We investigated the impact of anoxic holomixis on microbial diversity and microbially mediated sulfur cycling in Lake Rogoznica with an array of culture-independent microbiological methods. Our data suggest a tight coupling between the lake's chemistry and occurring microorganisms. During stratification, anoxygenic phototrophic sulfur bacteria were dominant at the chemocline and in the hypolimnion. After an anoxic mixing event, the anoxygenic phototrophic sulfur bacteria entirely disappeared, and the homogeneous, anoxic water column was dominated by a bloom of gammaproteobacterial sulfur oxidizers related to the GSO/SUP05 clade. This study is the first report of a community shift from phototrophic to chemotrophic sulfide oxidizers as a response to anoxic holomictic conditions in a seasonally stratified seawater lake. Stratified sulfidic lakes offer a physically and chemically welldefined environment for the development of complex yet stable microbial communities along light, oxygen, and sulfide gradients (1-4). Their water column is divided into an oxic surface layer, the epilimnion, and an anoxic bottom layer, the hypolimnion (5). The interface between these layers is the chemocline. It is the zone of highest chemical reactivity in the lake, typically accompanied by elevated microbial activity. In the anoxic hypolimnion and the underlying sediments, sulfate reduction plays a key role in organic matter remineralization (e.g., see references 3 and 6), resulting in the production of hydrogen sulfide. Where sulfide and light are present but oxygen is absent, anoxygenic phototrophic green sulfur bacteria (GSB) and purple sulfur bacteria (PSB) oxidize sulfide and form extensive blooms with cell densities of up to 10 7 cells ml Ϫ1 (1, 3, 7-10). Chemotrophic sulfur oxidizers (e.g., Alphaproteobacteria, Gammaproteobacteria, and Epsilonproteobacteria) often occur in layers above or together with GSB and PSB at the chemocline (3, 9, 11-13). In the oxic, sulfide-free epilimnion, the microbial community composition is distinct from those in underlying anoxic waters (10,13,14). Lake Rogoznica is a seasonally stratified seawater lake on the Croatian Adriatic coast. Its hydrography and chemistry have been studied extensively throughout the last 2 decades. The epilimnion is similar to waters of the adjacent Adriatic Sea in temperature and salinity, while the hypolimnion is highly enriched in nutrients (NH 4 ϩ , up to 150 M; PO 4 3Ϫ , up to 22 M; SiO 4 4Ϫ , up to 400 M) and dissolved organic carbon (DOC) (up to 6 mg...

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