scholarly journals Primary production, biomass and abundance of phototrophic picoplankton in the Mediterranean Sea: a review

1995 ◽  
Vol 9 ◽  
pp. 97-104 ◽  
Author(s):  
G Magazzù ◽  
F Decembrini
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Phototrophic Picoplankton ◽  
The Mediterranean

Primary production variability in the Mediterranean Sea from SeaWiFS data

2004 ◽  
Author(s):  
Simone Colella ◽  
Fabrizio D'Ortenzio ◽  
Salvatore Marullo ◽  
Rosalia Santoleri ◽  
Mariella Ragni ◽  
...  
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Production Variability ◽  
The Mediterranean

scholarly journals Dissolved and particulate primary production along a longitudinal gradient in the Mediterranean Sea

2011 ◽  
Vol 8 (3) ◽  
pp. 815-825 ◽  
Author(s):  
D. C. López-Sandoval ◽  
A. Fernández ◽  
E. Marañón
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Small Degree ◽  
Euphotic Layer ◽  
Relative Contribution ◽  
Carbon Demand ◽  
Extracellular Release ◽  
Photosynthetic Production ◽  
Longitudinal Pattern ◽  
The Mediterranean

Abstract. We have determined the photosynthetic production of dissolved (DOCp) and particulate organic carbon (POCp) along a longitudinal transect in the Mediterranean Sea during the summer stratification period. The euphotic layer-integrated rates of DOCp and POCp ranged between approximately 50–130 and 95–210 mgC m−2 d−1, respectively, and showed an east to west increasing trend. For the whole transect, the relative contribution of DOCp to total, euphotic layer-integrated primary production (percentage of extracellular release, PER) averaged ~37% and did not show any clear longitudinal pattern. In spite of the relatively high PER values, the measured DOCp rates were much lower than the estimated bacterial carbon demand, suggesting a small degree of coupling between phytoplankton exudation and bacterial metabolism. Our results, when compared with previous measurements obtained with the same methods in several ecosystems of contrasting productivity, support the view that the relative importance of DOCp increases under strong nutrient limitation.

scholarly journals Estimates of phytoplankton class-specific and total primary production in the Mediterranean Sea from satellite ocean color observations

2012 ◽  
Vol 26 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Julia Uitz ◽  
Dariusz Stramski ◽  
Bernard Gentili ◽  
Fabrizio D'Ortenzio ◽  
Hervé Claustre
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Ocean Color ◽  
Total Primary Production ◽  
The Mediterranean ◽  
Satellite Ocean Color

scholarly journals Pelagic primary production in the coastal Mediterranean Sea: variability, trends, and contribution to basin-scale budgets

2022 ◽  
Vol 19 (1) ◽  
pp. 47-69
Author(s):  
Paula Maria Salgado-Hernanz ◽  
Aurore Regaudie-de-Gioux ◽  
David Antoine ◽  
Gotzon Basterretxea
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Coastal Waters ◽  
Carbon Fixation ◽  
Total Carbon ◽  
Climate Indices ◽  
Basin Scale ◽  
Long Term Trends ◽  
The Mediterranean

Abstract. We estimated pelagic primary production (PP) in the coastal (<200 m depth) Mediterranean Sea from satellite-borne data, its contribution to basin-scale carbon fixation, its variability, and long-term trends during the period 2002–2016. Annual coastal PP was estimated at 0.041 Gt C, which approximately represents 12 % of total carbon fixation in the Mediterranean Sea. About 51 % of this production occurs in the eastern basin, whereas the western and Adriatic shelves contribute with ∼25 % each of total coastal production. Strong regional variability is revealed in coastal PP, from high-production areas (>300 g C m−2) associated with major river discharges to less productive provinces (<50 g C m−2) located in the southeastern Mediterranean. PP variability in the Mediterranean Sea is dominated by interannual variations, but a notable basin-scale decline (17 %) has been observed since 2012 concurring with a period of increasing sea surface temperatures in the Mediterranean Sea and positive North Atlantic Oscillation and Mediterranean Oscillation climate indices. Long-term trends in PP reveal slight declines in most coastal areas (−0.05 to −0.1 g C m−2 per decade) except in the Adriatic where PP increases at +0.1 g C m−2 per decade. Regionalization of coastal waters based on PP seasonal patterns reveals the importance of river effluents in determining PP in coastal waters that can regionally increase up to 5-fold. Our study provides insight into the contribution of coastal waters to basin-scale carbon balances in the Mediterranean Sea while highlighting the importance of the different temporal and spatial scales of variability.

scholarly journals Springtime contribution of dinitrogen fixation to primary production across the Mediterranean Sea

Ocean Science ◽  
2013 ◽  
Vol 9 (3) ◽  
pp. 489-498 ◽  
Author(s):  
E. Rahav ◽  
B. Herut ◽  
A. Levi ◽  
M. R. Mulholland ◽  
I. Berman-Frank
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
N2 Fixation ◽  
Eastern Mediterranean ◽  
Dominant Role ◽  
Early Spring ◽  
Western Basin ◽  
Eastern Basin ◽  
The Mediterranean ◽  
Planktonic Communities

Abstract. Dinitrogen (N2) fixation rates were measured during early spring across the different provinces of Mediterranean Sea surface waters. N2 fixation rates, measured using 15N2 enriched seawater, were lowest in the eastern basin and increased westward with a maximum at the Strait of Gibraltar (0.10 to 2.35 nmol N L−1 d−1, respectively). These rates were 3–7 fold higher than N2 fixation rates measured previously in the Mediterranean Sea during summertime and we estimated that methodological differences alone did not account for the seasonal changes we observed. Higher contribution of N2 fixation to primary production (4–8%) was measured in the western basin compared to the eastern basin (∼2%). Our data indicates that these differences between basins may be attributed to changes in N2-fixing planktonic communities and that heterotrophic diazotrophy may play a significant role in the eastern Mediterranean while autotrophic diazotrophy has a more dominant role in the western basin.

scholarly journals Seasonal and inter-annual variability of plankton chlorophyll and primary production in the Mediterranean Sea: a modelling approach

2011 ◽  
Vol 8 (3) ◽  
pp. 5379-5422 ◽  
Author(s):  
P. Lazzari ◽  
C. Solidoro ◽  
V. Ibello ◽  
S. Salon ◽  
A. Teruzzi ◽  
...  
Keyword(s):  
Primary Production ◽  
Mediterranean Sea ◽  
Seasonal Variability ◽  
Net Primary Production ◽  
Eastern Mediterranean ◽  
Light Extinction ◽  
Spatial And Temporal Variability ◽  
Nutrient Loads ◽  
Basin Scale ◽  
The Mediterranean

Abstract. This study presents a model of chlorophyll and primary production in the pelagic Mediterranean Sea. A 3-D-ecosystem model (OPATM-BFM) was adopted to explore specific system characteristics and quantify key biogeochemical variables covering a 6-yr period, from 1999 to 2004. We show that, on a basin scale, the Mediterranean Sea is characterised by a high degree of spatial and temporal variability in terms of primary production and chlorophyll concentrations. On a spatial scale, important horizontal and vertical gradients have been observed. In particular, notable differences between surface net primary production variability and the corresponding vertically integrated production rates have been identified, suggesting that care must be taken when inferring productivity in such systems from satellite observations alone. The present study indicates that seasonal variability dominates inter-annual differences. According to the simulations over a 6-yr period, the developed model correctly simulated the climatological features of deep chlorophyll maxima and chlorophyll west-east gradients, as well as the seasonal variability in the primary offshore regions that were studied. The integrated net primary production highlights north-south gradients that differ from surface net primary production gradients and illustrates the importance of adopting a spatial and temporal description to calculate basin-wide budgets and their variabilities. According to the model, the western Mediterranean, in particular the Alboran Sea, can be considered mesotrophic, whereas the eastern Mediterranean is oligotrophic. Finally, specific simulations that were designed to explore the role of ecosystem boundary conditions were performed. The subsequent results show that the effects of atmospheric and terrestrial nutrient loads on the total integrated net primary production account for less than 5 % of the annual budget, whereas an increase of 30 % in the light extinction factor impacts primary production by approximately 10 %.

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