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Use of local ecological knowledge in the management of algal blooms


More frequent and severe algal blooms are symptomatic of increasing ecosystem stress in coastal waters. Economic losses typically follow and local governments are forced to ‘manage’ this issue. Because many blooms are not monitored, local ecological knowledge (LEK) and oral history are the only practical tools to obtain data on bloom characteristics and identify their drivers. LEK was applied to outbreaks of brown algae on popular tourist beaches in south-east Queensland (Australia). Structured interviews with local citizens who had a close and frequent connection with the ocean provided 541 bloom records, which showed that blooms are regional (≥400 km) rather than local, and that they are a historical (≥40 years) rather than a recent phenomenon. LEK frequently cited that particular wind regimes coincided with the arrival of blooms, but this could not be verified by statistical cross-validation with empirical data. Harnessing LEK was valuable in engaging citizens, in generating testable hypotheses about plume causes, in providing a previously unrecognized historical perspective and in identifying the correct spatial scale of the issue. Multi-pronged approaches will be most effective in addressing blooms where local mitigation actions are combined with broader regional coastal environmental conservation efforts.

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*Correspondence: Dr Thomas Schlacher Tel +61 7 5430 2847 Fax +61754301276 e-mail:
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Agrawal A. & Gibson C.C. (1999) Enchantment and disenchantment: the role of community in natural resource conservation. World Development 27: 629649.
Begossi A. (2008) Local knowledge and training towards management. Environment, Development and Sustainability 10: 591603.
Berglund J., Mattila J., Ronnberg O., Heikkila J. & Bonsdorff E. (2003) Seasonal and inter-annual variation in occurrence and biomass of rooted macrophytes and drift algae in shallow bays. Estuarine Coastal and Shelf Science 56: 11671175.
Bolam S.G., Fernandes T.F., Read P. & Raffaelli D. (2000) Effects of macroalgal mats on intertidal sandflats: an experimental study. Journal of Experimental Marine Biology and Ecology 249: 123137.
Bonsdorff E. (1992) Drifting algae and zoobenthos—effects on settling and community structure. Netherlands Journal of Sea Research 30: 5762.
Busenberg G.J. (1999) Collaborative and adversarial analysis in environmental policy. Policy Sciences 32: 111.
Campbell S. (2001) Ammonium requirements of fast-growing ephemeral macroalgae in a nutrient-enriched marine embayment (Port Phillip Bay, Australia). Marine Ecology-Progress Series 209: 99107.
Campbell S.J. (1999) The uptake of ammonium by four species of macroalgae in Port Phillip Bay, Victoria, Australia. Marine and Freshwater Research 50: 515522.
Carr A. (2002) Grass Roots and Green Tape: Principles and Practices of Environmental Stewardship. Sydney, Australia: The Federation Press.
Chavez F.P., Strutton P.G., Friederich G.E., Feely R.A., Feldman G.C., Foley D.G. & McPhaden M.J. (1999) Biological and chemical response of the equatorial Pacific Ocean to the 1997–98 El Niño Science 286: 21262131.
Christie P. & White A.T. (1997) Trends in development of coastal area management in tropical countries: from central to community orientation. Coastal Management 25: 155181.
Clark B.M., Bennett B.A. & Lamberth S.J. (1996) Factors affecting spatial variability in seine net catches of fish in the surf zone of False Bay, South Africa. Marine Ecology Progress Series 131: 1734.
Clarke K.R. (1993) Non-parametric multivariate analyses of changes in community structure. Australian Journal of Ecology 18: 117143.
Cloern J.E. (2001) Our evolving conceptual model of the coastal eutrophication problem. Marine Ecology Progress Series 210: 223253.
Connolly R.M., Schlacher T.A. & Gaston T.F. (2010) Stable isotope evidence for trophic subsidy of coastal benthic fisheries by river discharge plumes generated off small estuaries. Marine Biology Research (in press).
Evans S.M. & Birchenough A.C. (2001) Community-based management of the environment: lessons from the past and options for the future. Aquatic Conservation: Marine and Freshwater Ecosystems 11: 137147.
Finlayson B.L. & Brizga S.O. (1995) The oral tradition, environmental change and river basin management: case studies from Queensland and Victoria. Australian Geographic Studies 33: 180192.
Fogerty J.E. (2001) Oral history: a guide to its creation and use. In: The Historical Ecology Handbook: a Restorationist's Guide to Reference Ecosystems, ed. Egan D. & Howell E.A., pp. 101120. Washington, DC, USA: Oxford University Press.
Gaston T.F., Schlacher T.A. & Connolly R.M. (2006) Flood discharges of a small river into open coastal waters: Plume traits and material fate. Estuarine Coastal and Shelf Science 69: 49.
Gray G.J., Enzer M.J. & Kusel J. (2001) Understanding community-based forest management: an editorial synthesis. In: Understanding Community-Based Forest Ecosystem Management, ed. Gray G.J., Enzer M.J. & Kusel J., pp. 123. New York, NY, USA: Hawarth Press Inc.
Gray J.S., Wu R.S.S. & Or Y.Y. (2002) Effects of hypoxia and organic enrichment on the coastal marine environment. Marine Ecology-Progress Series 238: 249279.
Hallegraeff G.M. (1993) A review of harmful algal blooms and their apparent global increase. Phycologia 32: 7999.
Head B. (2004) Letting the locals lead. Ecos 112: 3031.
Hoagland P., Anderson D.M., Kaoru Y. & White A.W. (2002) The economic effects of harmful algal blooms in the United States: estimates, assessment issues, and information needs. Estuaries 25: 819837.
Howarth R.W. & Marino R. (2006) Nitrogen as the limiting nutrient for eutrophication in coastal marine ecosystems: evolving views over three decades. Limnology and Oceanography 51: 364376.
Howarth R.W. (2008) Coastal nitrogen pollution: a review of sources and trends globally and regionally. Harmful Algae 8: 1420.
Kapoor I. (2001) Towards participatory environmental management? Journal of Environmental Management 63: 269279.
Kellert S.R., Mehta J.N., Ebbin S.A. & Lichtenfeld L.L. (2000) Community natural resource management: promise, rhetoric, and reality. Society and Natural Resources 13: 705715.
Kelly M.G. (1998) Use of community-based indices to monitor eutrophication in European rivers. Environmental Conservation 25: 2229.
Lane M.B., McDonald G.T. & Morrison T.H. (2004) Decentralisation and environmental management in Australia: a comment on the prescriptions of The Wentworth Group. Australian Geographical Studies 42: 103115.
Lane M.B. & Corbett T. (2005) The tyranny of localism: indigenous participation in community-based environmental management. Journal of Environmental Policy and Planning 7: 141159.
Lane M.B. & McDonald G. (2005) Community-based environmental planning: operational dilemmas, planning principles and possible remedies. Journal of Environmental Planning and Management 48: 709731.
Lane R. (1997) Oral histories and scientific knowledge in understanding environmental change: a case study in the Tumut Region, NSW. Australian Geographic Studies 35.
Lotze H.K. & Worm B. (2000) Variable and complementary effects of herbivores on different life stages of bloom-forming macroalgae. Marine Ecology-Progress Series 200: 167175.
Lotze H.K., Lenihan H.S., Bourque B.J., Bradbury R.H., Cooke R.G., Kay M.C., Kidwell S.M., Kirby M.X., Peterson C.H. & Jackson J.B.C. (2006) Depletion, degradation, and recovery potential of estuaries and coastal seas. Science 312: 18061809.
Lovelock C.E., Clegg E., Hurrey L., Udy J. & Moore K. (2008) Growth and physiology of nuisance alga Hincksia sordida during a bloom in South East Queensland, Australia. Journal of Experimental Marine Biology and Ecology 363: 8488.
McFadden L. (2007) Governing coastal spaces: the case of disappearing science in integrated coastal zone management. Coastal Management 35: 429443.
McGwynne L.E., McLachlan A. & Furstengerg J.P. (1988) Wrack breakdown on sandy beaches: its impact on interstitial meiofauna. Marine Environmental Research 25: 213232.
Myatt-Bell L.B., Scrimshaw M.D., Lester J.N. & Potts J.S. (2002) Public perception of managed realignment: Brancaster West Marsh, North Norfolk, UK. Marine Policy 26: 4557.
Nixon S.W. (1995) Coastal marine eutrophication: a definition, social causes, and future concerns. Ophelia 41: 199219.
Norkko J., Bonsdorff E. & Norkko A. (2000) Drifting algal mats as an alternative habitat for benthic invertebrates: species specific responses to a transient resource. Journal of Experimental Marine Biology and Ecology 248: 79104.
Olsson P. & Folke C. (2001) Local ecological knowledge and institutional dynamics for ecosystem management: a study of Lake Racken watershed, Sweden. Ecosystems 4: 85104.
Österblom H., Hansson S., Larsson U., Hjerne O., Wulff F., Elmgren R. & Folke C. (2007) Human-induced trophic cascades and ecological regime shifts in the Baltic Sea. Ecosystems 10: 877889.
Paerl H.W. (1997) Coastal eutrophication and harmful algal blooms: importance of atmospheric deposition and groundwater as ‘new’ nitrogen and other nutrient sources. Limnology and Oceanography 42: 11541165.
Paerl H.W., Valdes L.M., Peierls B.L., Adolf J.E. & Harding L.W. (2006) Anthropogenic and climatic influences on the eutrophication of large estuarine ecosystems. Limnology and Oceanography 51: 448462.
Phillips J.A. (2006) Drifting blooms of the endemic filamentous brown alga Hincksia sordida at Noosa on the subtropical east Australian coast. Marine Pollution Bulletin 52: 962968.
Raffaelli D.G., Raven J.A. & Poole L.J. (1998) Ecological impact of green macroalgal blooms. Oceanography and Marine Biology Annual Review 36: 97125.
Robertson H.A. & McGee T.K. (2003) Applying local knowledge: the contribution of oral history to wetland rehabilitation at Kanyabella Basin, Australia. Journal of Environmental Management 69: 275287.
Robertson M., Nichols P., Horwitz P., Bradby K. & MacKintosh D. (2000) Environmental narratives and the need for multiple perspectives to restore degraded landscapes in Australia. Ecosystem Health 6: 119133.
Romer G.S. (1990) Surf zone fish community and species response to a wave energy gradient. Journal of Fish Biology 36: 279287.
Salomonsen J., Flindt M., Geertz-Hansen O. & Johansen C. (1999) Modelling advective transport of Ulva lactuca (L) in the sheltered bay, Moellekrogen, Roskilde Fjord, Denmark. Hydrobiologia 397: 241252.
Schlacher T.A., Skillington A.J., Connolly R.M., Robinson W. & Gaston T.F. (2008) Coupling between marine plankton and freshwater flow in the plumes off a small estuary International Review of Hydrobiology 6: 641658.
Schlacher T.A. & Connolly R.M. (2009) Land-ocean coupling of carbon and nitrogen fluxes on sandy beaches. Ecosystems DOI: 10.1007/s10021-008-9224-2.
Smith J.E., Runcie J.W. & Smith C.M. (2005) Characterization of a large-scale ephemeral bloom of the green alga Cladophora sericea on the coral reefs of West Maui, Hawai'i. Marine Ecology-Progress Series 302: 7791.
Smith V.H. (2006) Responses of estuarine and coastal marine phytoplankton to nitrogen and phosphorus enrichment. Limnology and Oceanography 51: 377384.
Smith V.H., Joye S.B. & Howarth R.W. (2006) Eutrophication of freshwater and marine ecosystems. Limnology and Oceanography 51: 351355.
Tibby J., Lane M.B. & Gell P.A. (2007) Local knowledge and environmental management: A cautionary tale from Lake Ainsworth, New South Wales, Australia. Environmental Conservation 34: 334341.
Underwood A.J. (1997) Experiments in Ecology: Their Logical Design and Interpretation Using Analysis of Variance. Cambridge, UK: Cambridge University Press.
Valiela I., McClelland J., Hauxwell J., Behr P.J., Hersh D. & Foreman K. (1997) Macroalgal blooms in shallow estuaries: controls and ecophysiological and ecosystem consequences. Limnology and Oceanography 42 11051118.
Zar J.H. (1996) Biostatistical Analysis. Upple Saddle River, USA: Prentice Hall.
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