Organic Pollution and Its Impact on the Microbiology of Coastal Marine Environments: A Philippine Perspective
Organic pollution has changed marine coastal environments in both metropolitan and rural regions of the Philippines. This is documented for metropolitan Manila Bay and rural Lingayen Gulf with mariculture zones in Bolinao Bay. After less than a decade of intensive milk fish farming, organic feed and waste inputs apparently triggered negative feed back responses. These culminated in a devastating mass kill of cultivated as well as wild fish stocks in February 2002. This event appeared to be the combined result of oxygen depletion and a red tide harmful algae bloom. Subsequent minor fish kills affected a limited number of net cages mainly in stratified waters at drastically reduced salinities (down to 5) during the SW monsoonal rainy season.
Mesophilic vibrios from the fish farming area showed higher resistance to antibiotics than off-shore isolates and comprised several species of opportunistic pathogens, including Vibrio cholerae during the outbreak of a cholera epidemic in the coastal region.
Sediment traps revealed that 1 kg of (net) dry weight m–2 d–1 (or 50% of the average daily feed input to a fish cage) contributed to the sinking flux of particulate organic matter. Sediment cores mirror enormous near-source increases of organic matter input and deposition during the last decade. As a result of roughly eight years of intensive fish farming the sea floor of Bolinao Bay is covered with a 15-30 cm thick layer of watery sulfidic sediment (Eh = –250 to –150 mV). Due to the continued production of organic matter mineralization via microbe-mediated sulfaterespiration pathways, neritic sediments of the fish farming area are void of burrowing macrofauna. Comparisons with intertidal sediments of similar texture and redox potential reveal two orders of magnitude higher activities of key enzymes involved in organic matter recycling such as scleroproteases. This is at least partially attributable to abundant macrofaunal bioturbation in sulfidic intertidal sediments of the Bay. The extraordinary recycling potential of bioturbated and vegetated intertidal sediments remains a challenge to biogeochemical management options to circumvent the predominance of H2S-producing sulfate-respiration in organic matter remineralization.
Amann, R. and W. Ludwig (2000). Ribosomal RNA-targeted nucleic acid probes for studies in microbial ecology. FEMS Microbiol. Rev., 24: 555-565.
Azam, F. (1998). Microbial control of oceanic carbon flux: The plot thickens. Science, 280: 694-696.
Bruno, J.F., Petes, L.E., Harvell, C.D. and A. Hettinger (2003). Nutrient enrichment can increase the severity of coral diseases. Ecol. Lett. 6: 1056-1061.
Harvell, C.D., Kim, K., Burkholder, J.M., Colwell, R.R., Epstein, P.R. and D.J. Grimes (1999). Emerging marine diseases—climate links and anthropogenic factors. Science, 285: 1505-1510.
Holmer, M., Marba, N., Terrados, J., Duarte, C.M. and M.D. Fortes (2002). Impacts of milkfish (Chanos chanos) aquaculture on carbon and nutrient fluxes in the Bolinao area, the Philippines. Mar. Poll. Bull., 44: 685-696.
Jacinto, G. and I. Velasquez (2004). Hypoxia and dissolved inorganic nutrient dynamics in Manila Bay, Ms. Submitted.
Jass, J., Roberts, S.K. and H.M. Lappin-Scott (2002). Microbes and Enzymes in Biofilms. P. 307-326. In: R.G. Berns and R.P. Dick (eds.), Enzymes in the environment, M. Dekker, New York.
Kirchman, D.L. (ed.) (2000). Microbial Ecology of the ocean. Wiley & Sons, New York.
Kjelleberg, S., Hermansson, M. and P. Marden (1987). The transient phase between growth and nongrowth of heterotrophic bacteria, with emphasis on the marine environment. Ann. Rev. Microbiol, 41: 25-49.
Kostka, J.L., Gribsholt, B., Petrie, E., Dalton, D., Skelton, H. and E. Kristensen (2002). The rates and pathways of carbon oxidation in bioturbated saltmarsh sediments. Limnol. Oceanogr, 47: 230-240.
Lu, W.-J., Wang, H.-T., Huang, C.Y. and W. Reichardt (2002). Communities of iron(III)-reducing bacteria in irrigated tropical rice fields. Microbes Environ., 17: 170-178.
McGlone, M.L.S.D., Jacinto. G.,Velasquez. I. and D. Padayao (2004). Status of water quality in Philippine coastal and marine waters, pp.96-108. DA-BFAR, CRM project, Cebu City.
Reichardt, W. (1988a). Impact of bioturbation by Arenicola marina on microbiological parameters in intertidal sediments. Mar. Ecol. Prog. Ser., 44: 149-158.
Reichardt, W. (1988b). Measurement of enzymatic solubilization of P.O.M. in marine sediments by using dye release techniques. Arch. Hydrobiol./Ergebn. Limnol., 31: 353-363.
Reichardt, W., Jacinto, G.S. and M.L. McGlone (2003). Sustainable marine aquaculture in tropical waters with new concepts and technologies? Lessons learnt from a mass fish kill. Deutscher Tropentag, Goettingen.
Simidu,U. and K. Tsukamoto (1985). Habitat segregation and biochemical activities of marine members of the family Vibrionaceae. Appl. Environ. Microbiol, 50: 781-790.
Smith, D.C., Simon, M., Alldrege, A.L. and F. Azam (1992). Intensive hydrolytic activity on marine aggregates and implications for rapid particle dissolution. Nature, 359: 139-141.
Sombrito, E.Z., Bulos. A.D.M., Sta. Maria, E.J., Honrado, M.C.V., Azanza, R.V. and E.F. Furio (2004). Application of 210Pb-derived sedimentation rates and dinoflagellate cyst analyses in understanding Pyrodinium bahamense harmful algal blooms in Manila Bay and Malampaya Sound, Philippines. J. Environ. Radioactivity, 76: 177-194.
Talaue-MacManus, L., McGlone, M.L.S.D., Siringan, F., Villanoy, C. and W. Licuanan (1999). The impact of economic activities on the biogeochemical cycling in Lingayen Gulf, northern Philippines: A preliminary synthesis. LOICZ Newsletter, 10.
Udarbe-Walker, M.J. and E. Magdaong (2003). Circulation and hydrographic characteristics of a mariculture area northwest of Lingayen Gulf. Philipp. Scient., 40: 57-72.
Wingender, J. and K.-E. Jaeger (2002). Extracellular enzymes in biofilms. In: G. Bitton, Encyclopedia of Environmental Microbiology. Wiley & Sons, New York.
Webb, A.P. and B.D. Eyre (2004). Effect of natural populations of burrowing thalassinidean shrimp on sediment irrigation, benthic metabolism, nutrient fluxes and denitrification. Mar. Ecol. Prog. Ser., 268: 205-220.
Wu, R.S.S. (2002). Hypoxia: From molecular responses to ecosystem responses. Mar. Poll. Bull., 45: 35-45.
Ziebis, W., Forster, S., Huettel, M. and B.B. Joergensen (1996). Complex burrows of the mud shrimp Callianassa truncata and their geochemical impact in the sea bed. Nature, 382: 619-622.