Prokaryotic activities and abundance in pelagic areas of the Ionian Sea

Zaccone, Renata; Caruso, Gabriella; Azzaro, Maurizio; Azzaro, F.; Crisafi, E.; Decembrini, F.; Domenico, Emilio De; Domenico, Maria De; Ferla, Rosabruna La; Leonardi, M.; Giudice, Angelina Lo; Maimone, Giovanna; Mancuso, Monique; Michaud, Luigi; Monticelli, Luis Salvador; Raffa, F.; Ruggeri, G.; Bruni, Vivia

doi:10.1080/02757541003772914

Cited by 18 publications

(25 citation statements)

References 60 publications

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“…The range of variation of LAP activity found in the present study (0.04-4.91 nmol l −1 h −1 ) was similar to that reported in the NW Mediterranean Sea [36] and in the Ionian Sea (Table 2) [47,48], but lower than that observed in the Tyrrhenian Sea [37] and in the Mediterranean Sea, where LAP ranged from 1.1 to 9.3 nmol l −1 h −1 without a clear east-west gradient [44]. In the Atlantic Ocean, LAP values varied in a wide range [5,16], whereas higher values were measured in the Indian Ocean [15].…”

Section: Longitudinal Patterns Of Abundance and Biomasssupporting

confidence: 91%

“…GLU activity values were in the same magnitude order as those found in the Ionian Sea [47,48] and in the Gulf of Genoa [28].…”

Section: Longitudinal Patterns Of Abundance and Biomassmentioning

confidence: 65%

“…The close association of DOC and POC with PA and PB is rare in marine systems [9] and Figure 5 Principal Component Analysis performed on temperature, salinity, enzymatic activity, and carbon pool data (the triangles indicate the epipelagic samples, the circles the mesopelagic samples, and the squares the bathypelagic ones) confirms that in oligotrophic waters, PB depends on the availability of organic matter. According to previous studies [2,21,23,39], PA decreased significantly with depth; this decrease was more pronounced in the Ionian Sea (st. V7) with a fivefold reduction from epi-to mesopelagic waters [48].…”

Section: Longitudinal Patterns Of Abundance and Biomassmentioning

confidence: 99%

“…Vertical profiles of microbial activities have been reported for open oceans [4,5,15] and for the Mediterranean Sea [21,47,48], and several studies show a clear relationship between heterotrophic processes and the main water masses [22,35,47]. Nevertheless, the prokaryotic activities on organic matter and the biogeochemical implications of microbial hydrolysis of organic polymers in the Mediterranean area have not yet been sufficiently investigated.…”

Section: Introductionmentioning

confidence: 96%

“…The importance of the meso-and bathypelagic zones in organic matter biogeochemistry has only recently been re-evaluated [2,21,34,48]. Vertical profiles of microbial activities have been reported for open oceans [4,5,15] and for the Mediterranean Sea [21,47,48], and several studies show a clear relationship between heterotrophic processes and the main water masses [22,35,47].…”

Section: Introductionmentioning

confidence: 96%

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Enzymatic Activities and Prokaryotic Abundance in Relation to Organic Matter along a West–East Mediterranean Transect (TRANSMED Cruise)

et al. 2012

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The distribution of extracellular enzymatic activities (EEA) [leucine aminopeptidase (LAP), ß-glucosidase (GLU), alkaline phosphatase (AP)], as well as that of prokaryotic abundance (PA) and biomass (PB), dissolved organic carbon (DOC), particulate organic carbon and particulate total nitrogen (POC, PTN), was determined in the epi-, meso-, and bathypelagic waters of the Mediterranean Sea along a West-East transect and at one Atlantic station located outside the Strait of Gibraltar. This study represents a synoptical evaluation of the microbial metabolism during early summer. Decreasing trends with depth were observed for most of the parameters (PA, PB, AP, DOC, POC, PTN). Significant differences between the western and eastern basins of the Mediterranean Sea were found, displaying higher rates of LAP and GLU and lower C/N ratios more in the eastern than in the western areas. Conversely, in the epipelagic layer, PA and PB were found to be higher in the western than in the eastern basins. PB was significantly related to DOC concentration (all data, n = 145, r = 0.53, P < 0.01), while significant correlations of EEA with POC and PTN were found in the epipelagic layer, indicating an active response of microbial metabolism to organic substrates. Specific enzyme activities normalized to cell abundance pointed out high values of LAP and GLU in the bathypelagic layer, especially in the eastern basin, while cell-specific AP was high in the epi- and bathypelagic zone of the eastern basin indicating a rapid regeneration of inorganic P for both prokaryotes and phytoplankton needs. Low activity and abundance characterized the Atlantic station, while opposite trends of these parameters were observed along the Mediterranean transect, showing the uncoupling between abundance and activity data. In the east Mediterranean Sea, decomposition processes increased probably in response to mesoscale structures which lead to organic matter downwelling.

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Section: Longitudinal Patterns Of Abundance and Biomasssupporting

confidence: 91%

“…GLU activity values were in the same magnitude order as those found in the Ionian Sea [47,48] and in the Gulf of Genoa [28].…”

Section: Longitudinal Patterns Of Abundance and Biomassmentioning

confidence: 65%

Section: Longitudinal Patterns Of Abundance and Biomassmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

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Enzymatic Activities and Prokaryotic Abundance in Relation to Organic Matter along a West–East Mediterranean Transect (TRANSMED Cruise)

et al. 2012

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Seasonal Dynamics of Prokaryotic Abundance and Activities in Relation to Environmental Parameters in a Transitional Aquatic Ecosystem (Cape Peloro, Italy)

Zaccone

Azzaro

et al. 2013

Microb Ecol

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This study examines the effects of temporal changes on microbial parameters in a brackish aquatic ecosystem. To this aim, the abundances of prokaryotes and vibrios together with the rates of enzymatic hydrolysis of proteins by leucine aminopeptidase (LAP), polysaccharides by β-glucosidase (GLU) and organic phosphates by alkaline phosphatase (AP), heterotrophic prokaryotic production (HPP), respiration (R), were seasonally investigated, during a 2-year period in the coastal area of Cape Peloro (Messina, Italy), constituted by two brackish lakes (Faro and Ganzirri). In addition, physical and chemical parameters (temperature, salinity, nutrients) and particulate organic carbon and nitrogen (POC, PN) were measured. The influence of multiple factors on prokaryotic abundances and activities was analysed. The results showed that Cape Peloro area is characterised by high seasonal variability of the microbial parameters that is higher than the spatial one. Combined changes in particulate matter and temperature (T), could explain the variability in vibrios abundance, GLU and R activities in both lakes, indicating a direct stimulation of the warm season on the heterotrophic prokaryotic metabolism. Positive correlations between T (from 13.3 to 29.6 °C) and HPP, LAP, AP, POC, PN are also observed in Ganzirri Lake. Moreover, the trophic status index and most of the microbial parameters show significant seasonal differences. This study demonstrates that vibrios abundance and microbial activities are responsive to the spatial and seasonal changes of examined area. The combined effects of temperature and trophic conditions on the microbial parameters lead us to suggest their use as potential indicators of the prokaryotic response to climate changes in temperate brackish areas.

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Biogeochemical patterns and microbial processes in the Eastern Mediterranean Deep Water of Ionian Sea

et al. 2018

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Prokaryotic activities and abundance in pelagic areas of the Ionian Sea

Cited by 18 publications

References 60 publications

Enzymatic Activities and Prokaryotic Abundance in Relation to Organic Matter along a West–East Mediterranean Transect (TRANSMED Cruise)

Enzymatic Activities and Prokaryotic Abundance in Relation to Organic Matter along a West–East Mediterranean Transect (TRANSMED Cruise)

Seasonal Dynamics of Prokaryotic Abundance and Activities in Relation to Environmental Parameters in a Transitional Aquatic Ecosystem (Cape Peloro, Italy)

Biogeochemical patterns and microbial processes in the Eastern Mediterranean Deep Water of Ionian Sea

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