Biogeochemical significance of fatty acid distribution in the coastal upwelling ecosystem off Concepción (36°S), Chile |
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| Institution: | 1. Graduate School of Science and Technology, Shizuoka University, Suruga-ku, Shizuoka 422-8529, Japan;2. Department of Educational Chemistry, Indonesia University of Education, 40154 Bandung, Jawa Barat, Republic of Indonesia;3. Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan;4. JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;5. Graduate School of Science, Shizuoka University, Suruga-ku, Shizuoka 422-8529, Japan;6. Research Institute of Electronics, Shizuoka University, Suruga-ku, Shizuoka 422-8529, Japan;1. Department of Earth Sciences – Geochemistry, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;2. NIOZ Royal Netherlands Institute for Sea Research, PO Box 59, 1790 AB Den Burg, The Netherlands;3. ETH, Geological Institute, Sonneggstrasse 5, 8092 Zürich, Switzerland;4. Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;1. Post Graduate and Research Department of Physics, Government Arts College, Tiruvannamalai 606603, Tamil Nadu, India;2. Department of Physics, SSN college of Engineering, Chennai 603110, Tamil Nadu, India;3. Department of Geology, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India;4. National Institute of Oceanography, Council of Scientific and Industrial Research (CSIR), Donapaula, Goa 403004, India;1. Universidade Estadual do Ceará/LGCO, Av. Dr. Silas Munguba, 1700, CEP 60714-903, Fortaleza, Ceará, Brazil;2. Instituto de Ciências do Mar/UFC, Av. Abolição, 3207, CEP 60165-081, Fortaleza, Ceará, Brazil |
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| Abstract: | The distribution of fatty acids (FAs) in the water column and surface sediment of the coastal upwelling ecosystem off Concepción (central Chile; almost monthly from February 2007 to November 2008) was analyzed using gas chromatography–mass spectrometry. The concentration of FAs in the water column ranged from 3.4 to 67.7 μg l?1 and showed higher values in surface water than in bottom water, and under upwelling vs. non-upwelling conditions. The content in surface sediment ranged from 21.6 to 328.5 μg g dw?1 and had a higher abundance in February 2007, and January–March and June 2008. In surface water 16:0, 18:0 and 16:1n-7 made up ca. 47% of the FAs during the study period, while in bottom water 16:0, 18:0 and 18:1n-9 accounted for ca. 45%, and in surface sediment ca. 43% was accounted for by 14:0, 16:0, 16:1n-7 and 18:1n-7 FAs. Seasonal variability in the relative abundance of saturated and polyunsaturated FAs (PUFAs) was observed in surface water, while in bottom water and surface sediment no major temporal change in FA composition was observed. A negative exponential relationship between bacterial FAs and PUFAs from surface water and sediment suggests that bacteria may be responsible for ca. 80% of PUFA removal during sinking. We suggest that the FA composition of the surface sediment of the ocean is a consequence of rapid alteration of the FA pool by biological activity in the water column and sediment, driven by the removal of the labile fraction of FAs. |
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