Hydrobiologia

, Volume 815, Issue 1, pp 97–112 | Cite as

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

  • F. Placenti
  • M. Azzaro
  • V. Artale
  • R. La Ferla
  • G. Caruso
  • C. Santinelli
  • G. Maimone
  • L. S. Monticelli
  • E. M. Quinci
  • M. Sprovieri
Primary Research Paper
  • 64 Downloads

Abstract

Microbial processes involved in water biogeochemistry are linked to physical and chemical variability of water masses. While the occurrence of hydrological changes in the Eastern Mediterranean Sea has been documented, its effects on microbial dynamics and processes have been poorly investigated. An interdisciplinary survey was carried out in November 2011 to depict recent scenarios in the Ionian Mediterranean Sea. This study provides a snapshot of the hydrology and biogeochemistry of this basin, with particular emphasis on the abyssal waters, where two cores of the Eastern Mediterranean Deep Water, both of Adriatic origin, were found. The first core, located at about 3000 m, overlies the second one, which has a recent origin. Both water masses have Adriatic origin and the upper one is older than the lower one. A novel approach has been adopted to relate changes in microbial abundance and metabolism to new thermohaline and biogeochemical findings. A close relationship between surface processes driven by air–sea interaction, microbial variables, physical and chemical parameters (nutrients, dissolved organic carbon and oxygen) was observed. Being intimately coupled to DOC patterns, the microbial respiratory activity was likely the most responsive microbial parameter to hydrological changes, confirming this variable as a sentinel of environmental changes.

Keywords

Biogeochemical cycles Prokaryotic abundance Prokaryotic activities Mediterranean Sea 

Abbreviations

LAP

Leucine aminopeptidase

β-GLU

Beta glucosidase

AP

Alkaline phosphatase

PHP

Prokaryotic heterotrophic production

ETSa

Electron transport system assay

PA

Prokaryotic abundance

PB

Prokaryotic biomass

cell LAP

Cell-specific LAP

cell β-GLU

Cell-specific beta glucosidase

cell AP

Cell-specific AP

cell-PHP

Cell-specific PHP

AW/ISW

Atlantic water/ionian surface water

CIW/LIW

Cretan intermediate water/Levantine intermediate water

TMW

Transitional Mediterranean water

EMDWold

Old Eastern Mediterranean Deep Water

EMDWnew

New Eastern Mediterranean Deep Water

Notes

Acknowledgements

The Authors are grateful to Dr. Valeria Micale (CNR-IAMC Messina) for her accurate revision of English language as well as to the Editor and the anonymous referees for their valuable suggestions.

Supplementary material

10750_2018_3554_MOESM1_ESM.docx (11 kb)
Supplementary material 1 (DOCX 11 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • F. Placenti
    • 1
  • M. Azzaro
    • 2
  • V. Artale
    • 3
  • R. La Ferla
    • 2
  • G. Caruso
    • 2
  • C. Santinelli
    • 4
  • G. Maimone
    • 2
  • L. S. Monticelli
    • 2
  • E. M. Quinci
    • 1
  • M. Sprovieri
    • 1
  1. 1.Institute for Coastal Marine Environment, CNRTorretta GranitolaItaly
  2. 2.Institute for Coastal Marine Environment, CNRMessinaItaly
  3. 3.ENEA C.R. Frascati, SSPT-METFrascati, RomeItaly
  4. 4.Biophysics Institute, CNRPisaItaly

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