Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit) (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit) (Articolo in rivista) (literal)

Anno

• 2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1016/j.csr.2011.07.011 (literal)

Alternative label

• Azzaro M. ; R. La Ferla; G. Maimone; L.S. Monticelli; R. ZACCONE; G. Civitarese; (2012)
  Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit)
  in Continental shelf research; Academic Press Elsevier, Amsterdam (Paesi Bassi)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Azzaro M. ; R. La Ferla; G. Maimone; L.S. Monticelli; R. ZACCONE; G. Civitarese; (literal)

Pagina inizio

• 106 (literal)

Pagina fine

• 118 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

• In this study we examine the microbiological parameters in a deep convection site. We evaluate the variability of carbon flux vehiculated by prokaryotes. We find that the deep water convection alters the normal flux of the biological pump. The yearly trophic balance appears to move towards autotrophy only in the upper layer. We conclude that in the water column the prokaryotic carbon demand exceeds POC availability. (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 44 (literal)

Rivista

• Continental shelf research (Rivista)

Note

• Scopus (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• IAMC-CNR Messina OGS - Trieste (literal)

Titolo

• Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit) (literal)

Abstract

• We report on investigations of prokaryotic abundance, biomass, extracellular enzymatic activity, heterotrophic production and respiration in the full water column (~ 1200 m) of a deep convection site (the Southern Adriatic Pit), carried out on six cruises in 2006-2008. Vertical distribution of prokaryotic abundance varied vertically and temporally and ranged from 1.2 to 20.4 x 105 cell ml-1. Cell volumes, generally increased with depth and in the deep layers the lowest and highest mean cell volumes were observed in a period of no convective process (Feb-07) and a period of stratification (Jun-08) following the convection process occurred in Feb-08. Prokaryotic biomass decreased with depth and was related with both the seasonal cycles of organic matter and the hydrological processes. The picophytoplankton ranged in the upper layer (UL) from 0.089 to 10.71 x 104 cell ml-1 and cells were also recorded till 500 m depth in Feb-08. The variations of enzymatic activities in UL as well as leucine- aminopeptidase/ß-glucosidase ratio showed a seasonal trend probably linked with the productive processes of the photic layer. An inverse relation between Alkaline phosphatase (AP) and phosphate concentrations was found (AP = 0.0003 PO4 -1.7714, R2 = 0.333, P < 0.05) indicating that the presence of inorganic phosphorus in deep waters induced a reduction of total AP; such evidence may be related to deep water formation.. Generally cell-specific enzymatic activities increased with depth as did cell-specific carbon dioxide production rates, while cell-specific prokaryotic heterotrophic production had an opposite trend. High values of prokaryotic growth efficiency registered in the deep layers in Nov-06 reflected a supply of preformed C transported within the deep water masses. Overall, in 2007 in which no convective phenomenon was observed, the variability of prokaryotes metabolism was governed by the seasonal cycle of the organic matter, while in Nov-06 and Jun-08 the dynamics of deep water ventilation influenced the trend along the water column of many microbial parameters. The yearly trophic balance of the study site appeared to move towards autotrophy only in UL, whilst in the whole water column, the prokaryotic carbon demand exceeded POC availability rained down from euphotic zone. This mismatch was balanced by the DOC entrapped in the \"younger waters\" of new formation that alters the normal flux of the biological pump and fuels the deep marine biota in this area of deep water convection. (literal)

Editore

• Academic Press Elsevier (Editore)

Prodotto di

• Institute for coastal marine environment (IAMC) (Istituto)

Autore CNR

• LUIS SALVADOR MONTICELLI (Unità di personale interno)
• MAURIZIO AZZARO (Persona)
• ROSABRUNA LA FERLA (Unità di personale interno)
• RENATA ZACCONE (Persona)
• GIOVANNA MAIMONE (Persona)

Insieme di parole chiave

• Parole chiave di "Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit)" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute for coastal marine environment (IAMC) (Istituto)

Autore CNR di

• RENATA ZACCONE (Persona)
• LUIS SALVADOR MONTICELLI (Unità di personale interno)
• MAURIZIO AZZARO (Persona)
• ROSABRUNA LA FERLA (Unità di personale interno)
• GIOVANNA MAIMONE (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Continental shelf research (Rivista)

Editore di

• Academic Press Elsevier (Editore)

Insieme di parole chiave di

• Parole chiave di "Prokaryotic dynamics and heterotrophic metabolism in a deep-convection site of Eastern Mediterranea Sea (the Southern Adriatic Pit)" (Insieme di parole chiave)