Dissolved and particulate organic carbon and nitrogen in the Northwestern Mediterranean |
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| Institution: | 1. Fisheries and Oceans Canada, Pacific Biological Station, Nanaimo, British Columbia V9T 6N7, Canada;2. University of Victoria, Department of Geography, Victoria, British Columbia V8P 5C2, Canada;3. Vancouver Island University, Department of Fisheries and Aquaculture, Nanaimo, British Columbia V9R 5S5, Canada;4. SEA Vision Group Inc., Courtenay, British Columbia V9N 9N8, Canada;5. University of Victoria, Department of Biology, Victoria, British Columbia V8P 5C2, Canada;6. Fisheries and Oceans Canada, St. Andrews Biological Station, St. Andrews, New Brunswick E5B 2L9, Canada;7. Department of Biology, University of New Brunswick Saint John, Saint John, New Brunswick E2L 4L5, Canada;8. Grieg Seafood BC Ltd., Campbell River, British Columbia V9W 5P7, Canada;1. CAS key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Life Sciences, Shanxi Normal University, Xi''an, Shannxi, 710119, China;4. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla 666303, Yunnan, China;1. Archie Carr Center for Sea Turtle Research and Department of Biology, 220 Bartram Hall, University of Florida, Gainesville, FL 32611, USA;2. Caretta Research Project, PO Box 9841, Savannah, GA 31412, USA;3. ProDelphinus, Enrique Palacios 630-204, Lima 18, Peru;4. Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9EZ, UK;5. Fundação Pró-TAMAR, Rua Antônio Athanazio, 273, Ubatuba–SP, Brazil, 11680-000;6. Sea Turtle Association of Japan, Osaka, Japan and Suma Aqualife Park, Hyogo, Japan;7. Center for Ocean Solutions, 473 Via Ortega, Stanford University, Stanford, CA 94305, USA;8. Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, USA;9. Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, FL 34949, USA;10. Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile |
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| Abstract: | The distribution of dissolved organic carbon (DOC) and nitrogen (DON) and particulate organic carbon (POC) and nitrogen (PON) was studied on a transect perpendicular to the Catalan coast in the NW Mediterranean in June 1995. The transect covered a hydrographically diverse zone, including coastal waters and two frontal structures (the Catalan and the Balear fronts). The cruise was conducted during the stratified period, characterized by inorganic nutrient depletion in the photic zone and a well established deep chlorophyll a maximum. DOC concentrations were measured using a high-temperature catalytic oxidation method, and DON was determined directly, with an update of the Kjeldahl method, after removal of inorganic nitrogen.The ranges of DOC and DON concentrations were 44–95 μM-C and 2.8–6.2 μM-N. The particulate organic matter ranged between 0.9 and 14.9 μM-C and from 0.1 to 1.7 μM-N. The DOC : DON molar ratio averaged 15.5±0.4, and the mean POC : PON ratio was 8.6±0.6. The distribution of dissolved organic matter (DOM) was inverse to that of the salinity. The highest concentrations of DOM were found in coastal waters and in the stations affected by the Catalan front, located at the continental shelf break.It was estimated that recalcitrant DOM constituted 67% of the DOM pool in the upper 50 m. The data suggest that accumulation of DOC due to the decoupling of production and consumption may occur in the NW Mediterranean during stratification and that the organic matter exported from the photic layer is dominated by C-rich material. |
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