Sains Malaysiana 34(2): 23-33 (2005)

 

Lipid Geochemistry in a Sediment Core from

Conwy Estuary, North Wales

(Geokimia Lipid dalam Turus Sedimen daripada

Estuari Conwy di Utara Wales)

 

 

Masni Mohd Ali

School of Environmental and Natural Resource Sciences

Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

 

Stephen M. Mudge

School of Ocean Sciences

University of Wales, Bangor

Menai Bridge, Anglesey LL59 5AB

United Kingdom

 

 

 

ABSTRACT

 

The sources and diagenesis of organic matter in sediment core from the Conwy Estuary, North Wales have been examined using lipid biomarker data (i.e. fatty alcohols and sterols). Twenty-five core sections were analysed from the surface to 50 cm depth. Sediments near the top of the core were enriched in marine organic matter with high concentration of short chain fatty alcohols and sterols, and decreased with depth. Terrestrial organic matter predominated the bottom sections of the core. These observations can be seen from the short/long ratio, Alcohol Source Index and Sterol Source Index, suggesting the degradation of the marine derived compounds. The sewage derived organic matter increased from bottom to top of the core showing the increasing input of sewage from the past until now. Multivariate statistical technique (PCA) was carried out to interpret the data. PCA confirmed above observations with PC1 and PC2 indicated biogeochemical sources.

 

Keywords: fatty alcohols, sterols, diagenesis, PCA

 

 

ABSTRAK

 

Sumber dan diagenesis bahan organik di dalam turus sedimen daripada estuari Conwy di Utara Wales telah dikaji menggunakan data penanda biologi lipid (seperti alkohol lemak dan sterol). Dua puluh lima bahagian dalam turus tersebut telah dianalisa bermula dari permukaan hinggalah ke kedalaman 50 cm. Sedimen di permukaan adalah kaya dengan bahan organik marin dengan kepekatan rantai pendek alkohol lemak dan sterol yang tinggi, dan berkurangan mengikut kedalaman. Bahan organik terestrial mendominasi bahagian bawah turus. Pemerhatian ini dapat dilihat daripada nisbah rantai pendek, rantai panjang, Indeks Sumber Alkohol dan Indeks Sumber Sterol. Pemerhatian ini juga menunjukkan degradasi sebatian marin. Bahan organik kumbahan pula meningkat daripada bahagian bawah ke bahagian atas turus menunjukkan penambahan input kumbahan daripada masa lalu hingga kini. Teknik statistik multivariat (PCA) telah digunakan untuk menginterpretasi data. Analisis Komponen Utama mengesahkan pemerhatian di atas dengan Komponen 1 dan Komponen 2 menunjukkan sumber biogeokimia.

 

Kata kunci: Alkohol lemah, sterol, diagenesis, analisis komponen utama  

 

 

RUJUKAN/REFERENCES

 

Cranwell, P.A. & Volkman, J.K. 1981. Alkyl and steryl esters in a recent lacustrine sediment. Chem. Geol. 32: 29-43.

Escalona, RL., Rosales, M.T.L. & Mandelli, E.E 1980. On the presence of faecal steroids in sediments from two Mexican harbor. Bull. Environ. Contam. Toxicol. 24: 289-295.

Fukushima, K. & Ishiwatari, R. 1984 Acid and alcohol compositions of wax esters in sediments from different environments. Chem. Geol. 47: 41-56.

Gagosian, R. B., Nigrelli, G. E. & Volkman, J.K. 1983. Vertical transport and transformation of biogenic organic compounds from a sediment trap experiment off the coast of Peru. In: Suess, E. and Thiede, J. (Eds.). Coastal Upwelling, its Sediment Record. Part A: Responses of the Sedimentary Regime to Present Coastal Upwelling. New York: Plenum Press.

Graeve, M. & Kattner, G. 1992. Species-specific differences in intact wax esters of Calanus hyperboreus and C. Finmarchicus from Fram Strait - Greenland Sea. Mar. Chem. 39: 269-281.

Grimalt, J.O. & Albaiges, J. 1990. Characterization of the depositional of the Ebro Delta (western Mediterranean) by the study of sedimentary lipid markers. Mar. Geol. 95: 207-­224.

Harvey, H. R. & Macko, S. A. 1997. Catalysts or contributers? Tracking bacterial mediation of early diagenesis in the marine water column. Org. Geochem. 26: 531-544.

Hedges, J.I. & Prahl, EG. 1993. Early diagenesis: consequences for applications of molecular markers. In: M.H. Engel and S.A. Macko (Editors), Organic Geochemistry: Principles and Applications. New York, NY, Plenum.

Hudson, E. D., Parrish, C. C. & Helleur, R. J. 2001 Biogeochemistry of sterols in plankton, settling particles and recent sediments in a cold ocean ecosystem (Trinity Bay, Newfoundland). Mar. Chem. 76: 253-270.

Ishiwatari, R., Yamada, K, Matsumoto, K, Houtatsu, M. & Naraoka, H. 1999. Organic molecular and carbon isotopic records of the Japan Sea over the past 30 kyr. Paleoceanography 14: 260-270.

Kelly, A. G. 1995. Accumulation and persistence of chlorobiphenyls, organochlorine pesticides and faecal sterols at the garroch head sewage sludge disposal site, Firth of Clyde. Environ. Pollut. 88: 207-217.

Killops, S.D. & Killops, V.J. 1993. An Introduction to Organic Geochemistry. New York: Longman Scientific and Technical.

Laureillard, J. & Saliot, A. 1993. Biomarkers in organic matter produced in estuaries: a case study of the Krka estuary (Adriatic Sea) using the sterol marker series. Mar. Chern. 43: 247-261.

Matsumoto, K, Yamada, K. & Ishiwatari, R 2001. Sources of 24-ethylcholest-5-en-3b-ol in Japan Sea sediments over the past 30,000 years inferred from its carbon isotopic composition. Org. Geochem. 32: 259-270.

Meyers, P. A, Leenheer, M. J., Eadie, B. J. & Maule, S. J. 1984. Organic geochemistry of suspended and settling particulate matter in Lake Michigan. Geochim. Cosmochim. Acta. 48: 443-452.

Mudge, S. M. & Bebianno, M. J. 1997. Sewage contamination following an accidental spillage in the Rio Formosa, Portugal. Mar. Poll. Bull. 34: 163-170.

Mudge, S. M. & Norris, C. E. 1997. Lipid biomarkers in the Conwy Estuary (North Wales, U.K.): a comparison between fatty alcohols and sterols. Mar Chem. 57: 61-84.

Mudge, S. M., Bebianno, M. J., East, J. A & Barreira, L, A. 1999. Sterols in the Ria Formosa Lagoon, Portugal. Wat. Res. 33: 1038-1048.

Mudge, S. M. & Lintern, D. G. 1999. Comparison of sterol biomarkers for sewage with other measures in Victoria Harbour, B. C., Canada. Estuar. Coast. ShelfSci. 48: 27-38

Newell, S. Y. & Fell, J. W. 1992. Ergosterol content of living and submerged, decaying leaves and twigs of red mangrove. Can. J. Microbiol. 38: 979-982.

Parkes, R J. 1987. Analysis of microbial communities within sediments using biomarkers. In: Fletcher, M., Gray, T. R G. and Jones, J. G. (Eds.). Ecology of Microbial Communities. London Cambridge University Press.

Pearson, A., Eglinton, T. & McNichols, A. P. 2000. An organic tracer for surface ocean radiocarbon. Paleoceanography 15: 541-550.

Peng, X., Zhang, G., Mai, B., Min, Y. & Wang, Z. (2002) spatial and temporal trend of sewage pollution indicated by coprostanol in Macao Estuary, southern China. Mar. Poll. Bull. 45: 295-299.

Pereira, M. G. S. 1999 Bacterial degradation of linseed and sunflower oils in salt marsh sediments. PhD Thesis. University of Wales, Bangor. 199p.

Rtitters, H., Sass, H., Cypionka, H. & Rullkotter, J. 2002. Microbial communities in a Wadden Sea sediment core-clues from analyses of intact glyceride lipids, and released fatty acids. Org. Geochem. 33: 803-816.

Sargent, J.R, Gatten, RR & McIntosh, R. 1977. Wax esters in the marine environment-their occurrence, formation, transformation and ultimate fates. Mar. Chem. 5: 573-584.

Sherwin, M.R, Van Vleet, E.S., Fossato, V.U. & Dolci, E 1993. Coprostanol (5β- cholestan-3{β-ol) in lagoonal sediments and mussels in Venice, Italy. Mar. Pollut. Bull. 26: 501-507.

Sun, M. Y. & Wakeham, S.G. 1999. Diagenesis of planktonic fatty acids and sterols in Long Island Sound sediments: Influences of a phytoplankton bloom and bottom water oxygen content. J. Mar. Res. 57: 357-385.

Venkatesan, M.I. & Kaplan, I.R. 1990 Sedimentary coprostanol as an index of sewage addition in Santa Monica Basin, Sourthern California. Environ. Sci. Technol. 24: 208-214.

Venkatesan, M. I. & Mirsadeghi, E H. 1992 Coprostanol as sewage tracer in McMurdoch Sound, Antarctica. Mar. Poll. Bull. 25: 328-333.

Volkman, J.K. 1986. A review of sterol markers for marine and terrigenous organic matter. Org. Geochem. 9: 83-99.

Volkman, J.K., Farrington, J.w. & Gagosian, RB. 1987. Marine and terrigenous lipids in coastal sediments from the Peru upwelling region at 15°S: Sterols and triterpene alcohols. Org. Geochem. 11: 463-477.

Volkman, J.K, Rohjans, D., Rullkotter, J., Scholz-Bottcher, B. M. & Liebezeit, G. 2000. Sources and diagenesis of organic matter in tidak flat sediments from the German Wadden Sea. Continental Shelf Res. 20: 1139-1158.

Wakeham, S.G. & Ertel, J.R. 1988.  Diagenesis of organic matter in suspended particles and sediments in the Cariaco Trench. Org. Geochem. 13: 815-822.

Wakeham, S.G. & Canuel, E.A. 1990. Fatty acids and sterols of particulate matter n a brackish and seasonally coastal salt pond. Org. Geochem. 16: 703-713.

Weete, J.D. 1973.  Sterols of the fungi: Distribution and biosynthesis. Phytochem. 12: 1843-1864.

Yunker, M.B., MacDonald, R.W., Veltkamp. D.J. & Cretrey, W.J. 1995. Terrestrial and marine biomarkers in a seasonally ice-covered Arctic estuary–integration of multivariate and biomarker approaches. Mar. Chem. 49: 1-50.

 

 

 

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