The role of water mass dynamics in controlling bacterial abundance and production in the middle Adriatic Sea

Šolić, Mladen; Krstulović, Nada; Vilibić, Ivica; Kušpilić, Grozdan; Šestanović, Stefanija; Šantić, Danijela; Ordulj, Marin

doi:10.1016/j.marenvres.2008.01.004

Cited by 29 publications

(6 citation statements)

References 40 publications

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“…These results confirm previous findings showing [2,80] that predators prefer active bacteria and remove bacterial production, and that they can control the abundance of the bacterial community in surface waters [46]. Some studies [21,81] suggested strong bottom-up control of bacteria, which is in accordance with our results, showing a positive relationship between bacterial parameters and DOC concentration through the water column.…”

Section: Discussionsupporting

confidence: 93%

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Šantić

Kovačević

Bensi

et al. 2019

Water

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Southern Adriatic (Eastern Mediterranean Sea) is a region strongly dominated by large-scale oceanographic processes and local open-ocean dense water formation. In this study, picoplankton biomass, distribution, and activity were examined during two oceanographic cruises and analyzed in relation to environmental parameters and hydrographic conditions comparing pre and post-winter phases (December 2015, April 2016). Picoplankton density with the domination of autotrophic biomasses was higher in the pre-winter phase when significant amounts of picoaoutotrophs were also found in the meso-and bathy-pelagic layers, while Synechococcus dominated the picoautotrophic group. Higher values of bacterial production and domination of High Nucleic Acid content bacteria (HNA bacteria) were found in deep waters, especially during the post-winter phase, suggesting that bacteria can have an active role in the deep-sea environment. Aerobic anoxygenic phototrophic bacteria accounted for a small proportion of total heterotrophic bacteria but contributed up to 4% of bacterial carbon content. Changes in the picoplankton community were mainly driven by nutrient availability, heterotrophic nanoflagellates abundance, and water mass movements and mixing. Our results suggest that autotrophic and heterotrophic members of the picoplankton community are an important carbon source in the food web in the deep-sea, as well as in the epipelagic layer. Besides, viral lysis may affect the activity of the picoplankton community and enrich the water column with dissolved organic carbon.

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Section: Discussionsupporting

confidence: 93%

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Šantić

Kovačević

Bensi

et al. 2019

Water

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“…There is no doubt that global climate change is altering the thermal conditions in the Adriatic Sea (Matić et al, ) and changing the marine ecosystem (Ninčević Gladan et al ., ; Grbec et al, ). Furthermore, the Adriatic Sea is reported to be strongly phosphorus deficient (Buljan and Zore‐Armanda, ; Vukadin and Stojanoski, ), and bacterial growth has been shown to be P‐limited, not only in the open Adriatic (Thingstad et al, ; Van Wambeke et al, ; Pinhassi et al, ; Šolić et al, ) but also in coastal and estuarine areas (Šolić et al, ). However, some coastal areas in the middle and especially northern Adriatic are not P‐limited.…”

Section: Introductionmentioning

confidence: 99%

Temperature and phosphorus interacts in controlling the picoplankton carbon flux in the Adriatic Sea: an experimental versus field study

Šolić

Šantić

Šestanović

et al. 2019

Environmental Microbiology

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Temperature and phosphorus positively interacted in controlling picoplankton biomass production and its transfer towards higher trophic levels. Two complementary approaches (experimental and field study) indicated several coherent patterns: (1) the impact of temperature on heterotrophic bacteria was high at temperatures lower than 16°C and levelled off at higher temperatures, whereas this impact on autotrophic picoplankton was linear along the entire range of the investigated temperatures; (2) the addition of phosphorus increased the values of picoplankton production and grazing, but did not change the nature of their relationships with temperature substantially; (3) the picoplankton carbon flux towards higher trophic levels was larger during the warmer months (grazing by HNF dominated during the warmer period and by ciliates during the colder period) and also strengthened in conditions without phosphorus limitation; (4) the hypothesis that the available phosphorus can be better utilized at higher temperatures was confirmed for both autotrophic and heterotrophic picoplankton; (5) the hypothesis that the rise in temperature stimulates growth only in conditions of sufficient phosphorus was confirmed only for heterotrophic bacteria. Therefore, in the global warming scenario, an increase of the picoplankton carbon flux towards higher trophic levels can be expected in the Adriatic Sea, particularly under unlimited phosphorus conditions.

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“…Being a physical barrier, the sill has been considered as an ideal place for monitoring Adriatic‐wide processes [ Buljan and Zore‐Armanda , ] which include the Adriatic ingressions, dense water outflow [ Vilibić and Supić , ], growing and offshore advection of mesoscale instabilities in the Western Adriatic Current [ Burrage et al ., ; Vilibić et al ., ], long‐term trends of the Adriatic thermohaline properties and thermohaline circulation [ Vilibić et al ., ], and other. Long‐term physical, chemical, and biological data collected over the sill were used in a large number of studies [e.g., Marasović et al ., ; Šolić et al ., ; Berline et al ., ]. However, they have not been investigated by an objective nonlinear mapping method which is based on neural networks, such as the Self‐Organizing Maps (SOM) method [ Kohonen , ], and which is able to extract important physical, chemical, and biological patterns in the data.…”

Section: Introductionmentioning

confidence: 99%

“…This dual Journal of Geophysical Research: Oceans 10. 1002/2015JC010725 et al, 2005Solić et al, 2008;Berline et al, 2012]. However, they have not been investigated by an objective nonlinear mapping method which is based on neural networks, such as the Self-Organizing Maps (SOM) method [Kohonen, 1982[Kohonen, , 2001, and which is able to extract important physical, chemical, and biological patterns in the data.…”

Section: Introductionmentioning

confidence: 99%

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

et al. 2015

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We analyzed long‐term time series of temperature, salinity, and dissolved oxygen (DO) concentrations collected along the Palagruža Sill transect (middle Adriatic) between 1952 and 2010. The data have been mostly collected on seasonal basis, allowing for extraction of seasonal signal from the series. By applying Self‐Organizing Maps (SOM) method, a kind of unsupervised neural network method, the processes on a decadal time scale emerged as the most relevant for changes of oceanographic properties in the middle Adriatic area. Sensitivity studies revealed that oceanographic patterns obtained by SOM were not sensitive to shortening of time series, to removal of data from one station or to removal of DO from the analysis. Simultaneous SOM‐based mapping of sea surface heights in the northern Ionian Sea, with these heights serving as a proxy for the Adriatic‐Ionian Bimodal Oscillating System (BiOS), revealed asymmetry between anticyclonic and cyclonic BiOS patterns and correlated the decadal oscillations in the middle Adriatic with the reversals in the BiOS circulation regimes. These reversals are found to either rapidly change oceanographic properties in the middle Adriatic (e.g., during the Eastern Mediterranean Transient) or to change them with a time lag of 2–3 years. The mapped connections may be used for a short‐time (a few years) forecasting of the Adriatic oceanographic properties or for mapping future climate decadal oscillations as seen by ocean climate models.

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The role of water mass dynamics in controlling bacterial abundance and production in the middle Adriatic Sea

Abstract: International audienc

Cited by 29 publications

References 40 publications

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Temperature and phosphorus interacts in controlling the picoplankton carbon flux in the Adriatic Sea: an experimental versus field study

Mapping of decadal middle Adriatic oceanographic variability and its relation to the BiOS regime

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