Patterns in planktonic metabolism in the Mediterranean Sea

Regaudie-de-Gioux, Aurore; Vaquer-Sunyer, Raquel; Duarte, Carlos M.

doi:10.5194/bg-6-3081-2009

Cited by 33 publications

(21 citation statements)

References 39 publications

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“…These differences coincides with the abiotic gradients in temperature (16.6°C and 22.1°C, west and east basin mean annual temperature, respectively), salinity (Oviedo et al ), nutrients (Tanhua et al ) and primary production (Danovaro et al ; Gazeau et al ). Such metabolic differences between the Western and Eastern Mediterranean basins were described for planktonic communities (Regaudie‐De‐Gioux et al ), and were also often related to the Levantine nanism phenomenon, which is a decreasing west‐to‐east size gradient observed in numerous invertebrate (Levi ; Stephen ), fish (Sonin et al ) and dolphin (Sharir et al ) species. The relatively high mineral content ratio found in this study compared to El Haïkali et al () can be explained by either higher calcification rate, or by lower primary production rate in the eastern vs. the western Mediterranean.…”

Section: Discussionmentioning

confidence: 77%

The carbon turnover response to thermal stress of a dominant coralline alga on the fast warming Levant coast

Guy‐Haim

Silverman

Raddatz

et al. 2016

Limnology & Oceanography

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Marine organisms in the Mediterranean Sea experience the highest temperatures, salinities and oligotrophic conditions in its easternmost part along the eastern shores of the Levantine basin. Over the past three decades this region has warmed by ca. 1.5-3.08C with current winter and summer extremums of 178C and 318C, respectively. In this study, we tested the response of the native abundant articulated coralline red alga Ellisolandia elongata to this warming. Coralline algae play a key role in coastal ecosystems by structuring marine habitats, providing shelter for a myriad of species, and substantially influencing the coastal carbon budget. Despite being ubiquitous along the Levantine coasts, coralline's ecology, physiology, and biogeochemical role are nearly unknown as well as their performance under different temperatures. Measurements of primary production, respiration and calcification in the temperatures range 15-358C, which represent past, present and predicted local annual conditions, indicated two physiological tipping points: 1) metabolic breakdown above 318C; 2) metabolic shift at 238C, possibly promoting seasonal algal heterotrichy (perennation of the alga without its fronds). Annual production rates were evaluated under the current and predicted temperature regimes indicating a loss of ca. one third of the organic carbon and carbonate production by corallines contributed to the shallow Levantine coast in the upcoming decades. We predict that with continued warming, Eastern Mediterranean corallines will experience a westward range contraction, initiating with phenological shifts, followed by performance declines and population decreases, ending with local extinctions.

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Section: Discussionmentioning

confidence: 77%

The carbon turnover response to thermal stress of a dominant coralline alga on the fast warming Levant coast

Guy‐Haim

Silverman

Raddatz

et al. 2016

Limnology & Oceanography

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“…In the Mediterranean oligotrophic waters, organic carbon and nutrients are remineralized and recycled efficiently within a complex microbial food web [ Siokou‐Frangou et al , 2002] in the photic zone, thus leading to longer POP residence times and higher concentrations in the water. During the Thresholds cruises there was a trend of higher gross primary productivity in the western basin than in the eastern basin, even though it was not statistically significant, and a general tendency to net heterotrophy [ Regaudie‐de‐Gioux et al , 2009]. In addition, Chlorophyll concentrations at DCM were higher in the western basin than in the eastern Mediterranean.…”

Section: Resultsmentioning

confidence: 99%

“…North Western Mediterranean Sea, South Western Mediterranean Sea and Tyrrhenian Sea in the Western basin; Ionian Sea, Central Mediterranean Sea, Levantine Basin and Aegean Sea in the Eastern basin). The Mediterranean exhibits a gradient of increasing oligotrophy from west to east, in terms of nutrient concentration [ Krom et al , 1991; Lasternas et al , 2010], primary productivity [ Turley et al , 2000; Regaudie‐de‐Gioux et al , 2009] and autotrophic biomass [ Pitta et al , 2001]. During the 2006 cruise, picoplankton was dominated by Synechoccocus spp and Prochlorococcus spp , while the microplankton was dominated by diatoms except in the SW Black Sea where dinoflagellates and flagellates were the predominant [ Lasternas et al , 2010].…”

Section: Methodsmentioning

confidence: 99%

Biogeochemical and physical controls on concentrations of polycyclic aromatic hydrocarbons in water and plankton of the Mediterranean and Black Seas

Berrojalbiz

Dachs

Ojeda

et al. 2011

Global Biogeochem. Cycles

142

102

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[1] The Mediterranean and Black Seas are unique marine environments subject to important anthropogenic pressures due to atmospheric and riverine inputs of organic pollutants. They include regions of different physical and trophic characteristics, which allow the studying of the controls on pollutant occurrence and fate under different conditions in terms of particles, plankton biomass, interactions with the atmosphere, biodegradation, and their dependence on the pollutant physical chemical properties. Polycyclic Aromatic Hydrocarbons (PAHs) have been measured in samples of seawater (dissolved and particulate phases) and plankton during two east-west sampling cruises in June 2006 and May 2007. The concentrations of dissolved PAHs were higher in the south-western Black Sea and Eastern Mediterranean than in the Western Mediterranean, reflecting different pollutant loads, trophic conditions and cycling. Particle and plankton phase PAH concentrations were higher when lower concentrations of suspended particles and biomass occurred, with apparent differences due to the PAH physical chemical properties. The surface PAH particle phase concentrations decreased when the total suspended particles (TSP) increased for the higher molecular weight (MW) compounds, consistent with controls due to particle settling depletion of water column compounds and dilution. Conversely, PAH concentrations in plankton decreased at higher biomass only for the low MW PAHs, suggesting that biodegradative processes in the water column are a major driver of their occurrence in the photic zone. The results presented here are the most extensive data set available for the Mediterranean Sea and provide clear evidence of the important physical and biological controls on PAH occurrence and cycling in oceanic regions.

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“…A dataset of NCP measurements was created from the database originally collated and maintained for Robinson and Williams (2005), supplemented with recently published data (Regaudie-de-Gioux & Duarte, 2010;Regaudie-de-Gioux et al, 2009) and measurements made during recent AMTs (Table 1). The dataset is available at http://www.…”

Section: In Vitro Net Community Productionmentioning

confidence: 99%

Satellite estimates of net community production indicate predominance of net autotrophy in the Atlantic Ocean

Tilstone

Xie

Robinson

et al. 2015

Remote Sensing of Environment

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There is ongoing debate as to whether the oligotrophic ocean is predominantly net autotrophic and acts as a CO2 sink, or net heterotrophic and therefore acts as a CO2 source to the atmosphere. This quantification is challenging, both spatially and temporally, due to the sparseness of measurements. There has been a concerted effort to derive accurate estimates of phytoplankton photosynthesis and primary production from satellite data to fill these gaps; however there have been few satellite estimates of net community production (NCP). In this paper, we compare a number of empirical approaches to estimate NCP from satellite data with in vitro measurements of changes in dissolved O2 concentration at 295 stations in the N and S Atlantic Ocean (including the Antarctic), Greenland and Mediterranean Seas. Algorithms based on power laws between NCP and particulate organic carbon production (POC) derived from 14C uptake tend to overestimate NCP at negative values and underestimate at positive values. An algorithm that includes sea surface temperature (SST) in the power function of NCP and 14C POC has the lowest bias and root-mean square error compared with in vitro measured NCP and is the most accurate algorithm for the Atlantic Ocean. Nearly a 13 year time series of NCP was generated using this algorithm with SeaWiFS data to assess changes over time in different regions and in relation to climate variability. The North Atlantic subtropical and tropical Gyres (NATL) were predominantly net autotrophic from 1998 to 2010 except for boreal autumn/winter, suggesting that the northern hemisphere has remained a net sink for CO2 during this period. The South Atlantic sub-tropical Gyre (SATL) fluctuated from being net autotrophic in austral spring-summer, to net heterotrophic in austral autumn–winter. Recent decadal trends suggest that the SATL is becoming more of a CO2 source. Over the Atlantic basin, the percentage of satellite pixels with negative NCP was 27%, with the largest contributions from the NATL and SATL during boreal and austral autumn–winter, respectively. Variations in NCP in the northern and southern hemispheres were correlated with climate indices. Negative correlations between NCP and the multivariate ENSO index (MEI) occurred in the SATL, which explained up to 60% of the variability in NCP. Similarly there was a negative correlation between NCP and the North Atlantic Oscillation (NAO) in the Southern Sub-Tropical Convergence Zone (SSTC), which explained 90% of the variability. There were also positive correlations with NAO in the Canary Current Coastal Upwelling (CNRY) and Western Tropical Atlantic (WTRA) which explained 80% and 60% of the variability in each province, respectively. MEI and NAO seem to play a role in modifying phases of net autotrophy and heterotrophy in the Atlantic Ocean

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Patterns in planktonic metabolism in the Mediterranean Sea

Cited by 33 publications

References 39 publications

The carbon turnover response to thermal stress of a dominant coralline alga on the fast warming Levant coast

The carbon turnover response to thermal stress of a dominant coralline alga on the fast warming Levant coast

Biogeochemical and physical controls on concentrations of polycyclic aromatic hydrocarbons in water and plankton of the Mediterranean and Black Seas

Satellite estimates of net community production indicate predominance of net autotrophy in the Atlantic Ocean

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