scholarly journals Role of deep-sea bacteria in organic matter mineralization and adaptation to hydrostatic pressure conditions in the NW Mediterranean Sea

2003 ◽  
Vol 32 ◽  
pp. 209-218 ◽  
Author(s):  
C Tamburini ◽  
J Garcin ◽  
A Bianchi
Keyword(s):  
Organic Matter ◽  
Hydrostatic Pressure ◽  
Mediterranean Sea ◽  
Deep Sea ◽  
Organic Matter Mineralization ◽  
Deep Sea Bacteria ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

scholarly journals Organic biomarkers in deep-sea regions affected by bottom trawling: pigments, fatty acids, amino acids and carbohydrates in surface sediments from the La Fonera (Palamós) Canyon, NW Mediterranean Sea

2013 ◽  
Vol 10 (12) ◽  
pp. 8093-8108 ◽  
Author(s):  
E. Sañé ◽  
J. Martín ◽  
P. Puig ◽  
A. Palanques
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Organic Matter ◽  
Mediterranean Sea ◽  
Deep Sea ◽  
Bottom Trawling ◽  
Sediment Reworking ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

Abstract. Deep-sea ecosystems are in general adapted to a limited variability of physical conditions, resulting in high vulnerability and slow recovery rates from anthropogenic perturbations such as bottom trawling. Commercial trawling is the most recurrent and pervasive of human impacts on the deep-sea floor, but studies on its consequences on the biogeochemistry of deep-sea sediments are still scarce. Pigments, fatty acids, amino acids and carbohydrates were analysed in sediments from the flanks of the La Fonera (Palamós) submarine canyon (NW Mediterranean Sea), where a commercial bottom trawling fishery has been active for more than 70 yr. More specifically, we investigated how trawling-induced sediment reworking affects the quality of sedimentary organic matter which reaches the seafloor and accumulates in the sediment column, which is fundamental for the development of benthic communities. Sediment samples were collected during two oceanographic cruises in spring and autumn 2011. The sampled sites included trawl fishing grounds as well as pristine (control) areas. We report that bottom trawling in the flanks of the La Fonera Canyon has caused an alteration of the quality of the organic matter accumulated in the upper 5 cm of the seafloor. The use of a wide pool of biochemical tracers characterized by different reactivity to degradation allowed for us to discriminate the long-term effects of trawl-induced sediment reworking from the natural variability caused by the seasonal cycle of production and sinking of biogenic particles. Differences between untrawled and trawled areas were evidenced by labile amino acids, while differences between spring and autumn samples were detected only by the more labile indicators chlorophyll a and monounsaturated fatty acids. These results suggest that changes in the biochemical composition of the sedimentary organic matter caused by bottom trawling can be more relevant than those associated with natural seasonality and pose serious concerns about the ecological sustainability of deep-sea trawling activities.

scholarly journals Organic biomarkers in deep-sea regions affected by bottom trawling: pigments, fatty acids, amino acids and carbohydrates in surface sediments from the La Fonera (Palamós) Canyon, NW Mediterranean Sea

2012 ◽  
Vol 9 (12) ◽  
pp. 18601-18654
Author(s):  
E. Sañé ◽  
J. Martín ◽  
P. Puig ◽  
A. Palanques
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Organic Matter ◽  
Mediterranean Sea ◽  
Deep Sea ◽  
Bottom Trawling ◽  
Sediment Reworking ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

Abstract. Deep-sea ecosystems are in general adapted to a limited variability of physical conditions, resulting in high vulnerability and slow recovery rates from anthropogenic perturbations such as bottom trawling. Commercial trawling is the most recurrent and pervasive of human impacts on the deep-sea floor, but studies on its consequences on the biogeochemistry of deep-sea sediments are still scarce. Pigments, fatty acids, amino acids and carbohydrates were analyzed in sediments from the flanks of the La Fonera (Palamós) submarine canyon (NW Mediterranean Sea), where a commercial bottom trawling fishery has been active for more than 70 yr. More specifically, we investigated how trawling-induced sediment reworking affects the quality of sedimentary organic matter which reaches the seafloor and accumulates in the sediment column, which is fundamental for the development of benthic communities. Sediment samples were collected during two oceanographic cruises in spring and autumn 2011. The sampled sites included trawl fishing grounds as well as pristine (control) areas. We report that bottom trawling in the flanks of the La Fonera Canyon has caused an alteration of the quality of the organic matter accumulated in the upper 5 cm of the seafloor. The use of a wide pool of biochemical tracers characterized by different reactivity to degradation allowed us to discriminate the long-term effects of trawled-induced sediment reworking from the natural variability caused by the seasonal cycle of production and sinking of biogenic particles. Differences between untrawled and trawled areas were evidenced by labile amino acids, while differences between spring and autumn samples were detected only by the more labile indicators chlorophyll a and mono-unsaturated fatty acids. These results suggest that changes in the biochemical composition of the sedimentary organic matter caused by bottom trawling can be more relevant than those associated with natural seasonality and pose serious concerns about the ecological sustainability of deep-sea trawling activities.

Composition and provenance of terrigenous organic matter transported along submarine canyons in the Gulf of Lion (NW Mediterranean Sea)

2013 ◽  
Vol 118 ◽  
pp. 81-94 ◽  
Author(s):  
Catalina Pasqual ◽  
Miguel A. Goñi ◽  
Tommaso Tesi ◽  
Anna Sanchez-Vidal ◽  
Antoni Calafat ◽  
...  
Keyword(s):  
Organic Matter ◽  
Mediterranean Sea ◽  
Submarine Canyons ◽  
Terrigenous Organic Matter ◽  
Gulf Of Lion ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

Food web structure and vulnerability of a deep-sea ecosystem in the NW Mediterranean Sea

2013 ◽  
Vol 75 ◽  
pp. 1-15 ◽  
Author(s):  
Samuele Tecchio ◽  
Marta Coll ◽  
Villy Christensen ◽  
Joan B. Company ◽  
Eva Ramírez-Llodra ◽  
...  
Keyword(s):  
Food Web ◽  
Mediterranean Sea ◽  
Deep Sea ◽  
Food Web Structure ◽  
Web Structure ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

scholarly journals Pseudo-nitzschia spp. (Bacillariophyceae) and dissolved organic matter (DOM) dynamics in the Ebro Delta (Alfacs Bay, NW Mediterranean Sea)

2009 ◽  
Vol 83 (4) ◽  
pp. 539-549 ◽  
Author(s):  
Sofia Loureiro ◽  
Esther Garcés ◽  
Margarita Fernández-Tejedor ◽  
Dolors Vaqué ◽  
Jordi Camp
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Mediterranean Sea ◽  
Ebro Delta ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

Riverine transport of terrestrial organic matter to the North Catalan margin, NW Mediterranean Sea

2013 ◽  
Vol 118 ◽  
pp. 71-80 ◽  
Author(s):  
Anna Sanchez-Vidal ◽  
Marina Higueras ◽  
Eugènia Martí ◽  
Camino Liquete ◽  
Antoni Calafat ◽  
...  
Keyword(s):  
Organic Matter ◽  
Mediterranean Sea ◽  
Terrestrial Organic Matter ◽  
The North ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea ◽  
Riverine Transport
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