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Unsustainable Land-Based Source Pollution in a Climate of Change: A Roadblock to the Conservation and Recovery of Elkhorn Coral Acropora palmata (Lamarck 1816)

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DOI: 10.4236/nr.2014.510050    3,628 Downloads   4,696 Views   Citations


Chronic eutrophication and turbidity are critical detrimental factors impacting coral reef ecosystems, adversely affecting their ecological functions, services, benefits, and resilience across multiple spatial scales and over prolonged periods of time. Inadequate land use practices and lack of appropriate sewage treatment can adversely contribute to increase land-based source pollution (LBSP) impacts in coastal waters and to magnify impacts by sea surface warming trends associated to climate change. Fringing coral reefs off Vega Baja, Puerto Rico, support extensive remnant patches of Elkhorn coral Acropora palmata (Lamarck 1816), which was listed in 2006 as a threatened species under the US Endangered Species Act. Chronic impacts by LBSP have significantly affected local downstream fringing reefs. We characterized the spatial extent of a water quality stress gradient across 12 reefs along the Vega Baja coast through monthly measurements of multiple physico-chemical parameters. Most parameters, particularly PO4, , chlorophyll-a, and the concentration of optical brighteners (OABs), showed a statistically significant increase (PERMANOVA, p < 0.05) in waters close to the main pollution sources, but also in waters adjacent to Cibuco River effluents. Dissolved oxygen also declined and turbidity increased on polluted sites. PO4, , and chlorophyll-a, exceeded recommended concentrations for coral reef ecosystems by factors of 7 - 50 times, 600 - 1240 times, and 17 - 83 times, respectively, depending on the source of the effluents and the distance from sewage pollution sources. Also, water turbidity exceeded 4 - 10 times the recommended value for pristine coral reefs. Coral reefs showed significant decline in close proximity to the polluted zone, showing a significantly different benthic community structure (PERMANOVA, p < 0.0001) dominated by non-reef building taxa (i.e., macroalgae, algal turf) and bare substrate. Percent coral cover and abundance of A. palmata, showed a significant increase with distance. Coral species richness, species diversity index, and the variance in taxonomic distinctness were very low on reef patches adjacent to the polluted zone, increased at a moderate distance with increasing coral cover and co-existence of multiple species, and declined far from the pollution source due to dominance exerted by A. palmata. This study suggests that chronic LBSP resulted in a major decline of one of the largest and most dense remnant stands of A. palmata across the northeastern Caribbean and that nutrient and chlorophyll-a concentrations were unsustainable for coral reefs. This situation requires immediate solution to prevent further damage to these unprecedented resources. It further suggests that chronic LBSP may synergistically magnify sea-surface warming impacts driving corals to an increased state of risk in face of forecasted climate change impacts. Actions to mitigate and adapt to climate change impacts on coral reefs must require a priori controls of LBSP to be effective.

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The authors declare no conflicts of interest.

Cite this paper

Díaz-Ortega, G. and Hernández-Delgado, E. (2014) Unsustainable Land-Based Source Pollution in a Climate of Change: A Roadblock to the Conservation and Recovery of Elkhorn Coral Acropora palmata (Lamarck 1816). Natural Resources, 5, 561-581. doi: 10.4236/nr.2014.510050.


[1] Roberts, C.M., McClean, C.J., Veron, J.E.N., Hawkins, J.P., Allen, G.R., McAllister, D.E., Mittermeier, C.G., Schueler, F.W., Spalding, M., Wells, F., Vynne, C. and Werner, T.B. (2002) Marine Biodiversity Hotspots and Conservation Priorities for Tropical Reefs. Science, 295, 1280-1284.
[2] Pauly, D., Christensen, V., Guénette, S., Pitcher, T.J., Sumaila, U.R., Walter, C.J., Watson, R. and Zeller, D. (2002) Towards Sustainability in World Fisheries. Nature, 418, 689-695.
[3] Wilkinson, C. (2008) Status of Coral Reefs of the World: 2008. Global Coral Reef Monitoring Network and Reef and Rainforest Research Centre, Townsville, 296.
[4] Cloern, J. (2001) Our Evolving Conceptual Model of the Coastal Eutrophication Problem. Marine Ecology Progress Series, 210, 223-253.
[5] Nixon, S.W. (1995) Coastal Marine Eutrophication: A Definition, Social Causes, and Future Concerns. Ophelia, 41, 199-219.
[6] Lapointe, B.E., O’Connell, J.D. and Garrett, G.S. (1990) Nutrient Couplings between On-Site Sewage Disposal Systems, Groundwaters, and Nearshore Surface Waters of the Florida Keys. Biogeochemistry, 10, 289-307.
[7] Corbett, D.R., Chanton, J., Burnett, W., Dillon, K., Rutkowski, C. and Fourqueran, J.W. (1999) Patterns of Groundwater Discharge into Florida Bay. Limnology and Oceanography, 44, 1045-1055.
[8] Lewis, J.B. (1987) Measurements of Groundwater Seepage Flux onto a Coral Reef: Spatial and Temporal Variations. Limnology and Oceanography, 32, 1165-1169.
[9] Hernández-Delgado, E.A. (2005) Historia natural, caracterización, distribución y estado actual de los arrecifes de coral Puerto Rico. In: Joglar, R.L., Ed., Biodiversidad de Puerto Rico: Vertebrados Terrestres y Ecosistemas. Serie Historia Natural, Editorial Instituto de Cultura Puertorriquena, San Juan, 281-356, 563.
[10] Burke, L., Reytar, K., Spalding, M., Perry, A., Cooper, E., Kushner, B., Selig, E., Starkhouse, B., Teleki, K., Waite, R., Wilkinson, C. and Young, T. (2011) Reefs at Risk Revisited. World Resources Institute, Washington DC, 114.
[11] Hernández-Delgado, E.A., Ramos-Scharrón, C.E., Guerrero, C., Lucking, M.A., Laureano, R., Méndez-Lázaro, P.A. and Meléndez-Díaz, J.O. (2012) Long-Term Impacts of Non-Sustainable Tourism and Urban Development in Small Tropical Coastal Habitats in a Changing Climate: Lessons Learned from Puerto Rico. In: Kasimoglu, M., Ed., Visions from Global Tourism Industry-Creating and Sustaining Competitive Strategies, InTech Publications, 357-398.
[12] Lapointe, B.E. and Clark, M.W. (1992) Nutrient Inputs from the Watershed and Coastal Eutrophication in the Florida Keys. Estuaries, 15, 465-476.
[13] Nowlis, J.S., Roberts, C.M., Smith, A.H. and Siirila, E. (1997) Human-Enhanced Impacts of a Tropical Storm on Nearshore Coral Reefs. AMBIO, 26, 515-521.
[14] Ramos-Scharrón, C.E., Amador, J.M. and Hernández-Delgado, E.A. (2012) An Interdisciplinary Erosion Mitigation Approach for Coral Reef Protection—A Case Study from the Eastern Caribbean. In: Cruzado, A., Ed., Marine Ecosystems, InTech Publications, 127-160.
[15] Bruno, J., Peters, L., Harvell, C.D. and Hettinger, A. (2003) Nutrient Enrichment Can Increase the Severity of Coral Diseases. Ecology Letters, 6, 1056-1061.
[16] Kaczmarsky, L., Draud, M. and Williams, E. (2005) Is There a Relationship between Proximity to Sewage Effluent and the Prevalence of Coral Disease. Caribbean Journal of Science, 41, 124-137.
[17] Vega-Thurber, R., Burkepile, D., Fuchs, C., Shantz, A., McMinds, R. and Zaneveld, J. (2014) Chronic Nutrient Enrichment Increases Prevalence and Severity of Coral Disease and Bleaching. Global Change Biology, 20, 544-554.
[18] Walker, D. and Ormond, R. (1982) Coral Death from Sewage and Phosphate Pollution at Aqaba, Red Sea. Marine Pollution Bulletin, 13, 21-25.
[19] Pastorok, R. and Bilyard, G. (1985) Effects of Sewage Pollution on Coral-Reef Communities. Marine Ecology Progress Series, 21, 175-189.
[20] Patternson, K.L., Porter, J.W., Ritchie, K.B., Polson, S.W., Mueller, E., Peters, E.C., Santavy, D.L. and Smith, G.W. (2002) The Etiology of White Pox, a Lethal Disease of the Caribbean Elkhorn Coral, Acropora palmate. Proceedings of the National Academy of Sciences of the United States of America, 99, 8725-8730.
[21] Bonkosky, M., Hernández-Delgado, E.A., Sandoz, B., Robledo, I.E., Norat-Ramírez, J. and Mattei, H. (2009) Detection of Spatial Fluctuations of Non-Point Source Fecal Pollution in Coral Reef Surrounding Waters in Southwestern Puerto Rico Using PCR-Based Assays. Marine Pollution Bulletin, 58, 45-54.
[22] Hernández-Delgado, E.A., Sandoz, B., Bonkosky, M., Mattei, H. and Norat, J. (2010) Impacts of Non-Point Source Sewage Pollution in Elkhorn Coral, Acropora palmata (Lamarck), Assemblages of the Southwestern Puerto Rico Shelf. Proceedings of the 11th International Coral Reefs Symposium, Ft. Lauderdale, 7-11 July 2008, 747-751.
[23] Marubini, F. and Davies, P. (1996) Nitrate Increases Zooxanthellae Population Density and Reduces Skeletogenesis in Corals. Marine Biology, 127, 319-328.
[24] Lapointe, B.E., Littler, M.M. and Littler, D.S. (1992) Modification of Benthic Community Structure by Natural Eutrophication: The Belize Barrier Reef. Proceedings of the 7th International Coral Reef Symposium, 1, 323-334.
[25] Naim, O. (1993) Seasonal Responses of a Fringing Reef Community to Eutrophication (Reunion Island, Western Indian Ocean). Marine Ecology Progress Series, 99, 137-151.
[26] Szmant, A. (2002) Nutrient Enrichment on Coral Reefs: Is It a Major Cause of Coral Reef Decline? Estuaries, 25, 743-766.
[27] Littler, M., Littler, D. and Brooks, B. (2006) Harmful Algae on Tropical Coral Reefs: Bottom-Up Eutrophication and Top-Down Herbivory. Harmful Algae, 5, 565-585.
[28] Meesters, E.H., Bak, R.P.M., Westmacott, S., Ridgley, M. and Dollar, S. (1998) A Fuzzy Logic Model to Predict Coral Reef Development under Nutrient and Sediment Stress. Conservation Biology, 12, 957-965.
[29] Perry, C.T., Smithers, S.G. and Johnson, K.G. (2009) Long-Term Coral Community Records from Lugger Shoal on the Terrigenous Inner-Shelf of the Central Great Barrier Reef, Australia. Coral Reefs, 28, 941-948.
[30] Ramos, R., Cipirani, R., Guzmán, H.M. and García, E. (2009) Chronology of Mercury Enrichment Factors in Reef Corals from Western Venezuela. Marine Pollution Bulletin, 58, 222-229.
[31] Wallace, C. (1999) Staghorn Corals of the World: A Revision of the Coral Genus Acropora. CSIRO, Collingwood, 1922.
[32] Weil, E., Hernández-Delgado, E., Bruckner, A., Ortiz, A., Nemeth, M. and Ruiz, H. (2002) Distribution and Status of Acroporid Coral (Scleractinia) Populations in Puerto Rico. In: Bruckner, A.W., Ed., Proceedings of the Caribbean Acropora Workshop: Potential Application of the US Endangered Species Act as a Conservation Strategy, NOAA Tech. Memorandum NMFS-OPR-24, Silver Spring, 71-98, 199 pp.
[33] Bruckner, A.W. (2002) Proceedings of the Caribbean Acropora Workshop: Potential Application of the US Endangered Species Act as a Conservation Strategy. NOAA Technical Memorandum NMFS-OPR-24, Silver Spring, 199.
[34] Hernández-Delgado, E.A. (2000) Effects of Anthropogenic Stress Gradients in the Structure of Coral Reef Epibenthic and Fish Communities. Ph.D. Dissertation, University of Puerto Rico, San Juan, 330.
[35] Ortiz-Prosper, A. (2005) Population Dynamics of Hurricane-Generated Fragments of Elkhorn Coral Acropora palmata (Lamarck, 1816). Ph.D. Dissertation, University of Puerto Rico, Mayagüez, 74.
[36] Scharer, M., Nemeth, M., Valdivia, A., Miller, M., Williams, D. and Diez, C. (2010) Elkhorn Coral Distribution and Condition throughout the Puerto Rican Archipelago. Proceedings of the 11th International Coral Reef Symposium, Ft. Lauderdale, 7-11 July 2008, 815-819.
[37] Méndez-Lázaro, P., Hernández Delgado, E.A., Norat-Ramírez, J., Cordero-Rivera, L. and Santiago-Nieves, A. (2012) Técnicas de SIG Aplicadas al Estudio de Zonas Costaneras y Cuencas Hidrográficas en la Isla de Puerto Rico. Revista Internacional de Ciencia y Tecnología de Información Geogfráfica, Geo-Focus, 12, 71-92.
[38] Norat-Ramírez, J., Méndez-Lázaro, P., Hernández-Delgado, E.A. and Cordero-Rivera, L. (2013) El Impacto de Aguas Usadas de Fuentes Dispersas en el Litoral Costero de la Reserva Marina Tres Palmas (Rincón-Puerto Rico). Revista de la Asociación Venezolana de Ingeniería Sanitaria y Ambiental, 7, 27-30.
[39] Hernández-Delgado, E.A., Méndez-Lázaro, P.A., Medina-Muniz, J.L., Nieves-Santiago, A., Cabrera-Molina, J. and Rodríguez-Díaz, I.M. (2012) ChronicImpacts of Sewage and Turbidityon Coral Reefs within the Tres Palmas Marine Reserve, Rincón, Puerto Rico: I. Threatened Elkhorn Coral (Acropora palmata) Populations. Final Report Submitted to Environmental Science Graduate Program, Department of Public Health, University of Puerto Rico-Medical Sciences Campus, and to the Coral Reef Conservation Program, Department of Natural and Environmental Resources, San Juan, Puerto Rico, 70.
[40] Connell, J.H. (1978) Diversity of Tropical Rain Forests and Coral Reefs. Science, 199, 1302-1310.
[41] Hernández-Delgado, E.A., Hutchinson, Y., Hernández-Pacheco, R., Ruiz-Maldonado, T., Laureano, R., Oms, J. and Díaz, P.L. (2010) Beach Renourishment Activities and Sewage Pollution Caused Rapid Degradation of FederalDesignated Critical Habitats of the Threatened Elkhorn Coral (Acropora palmata) in Vega Baja, Puerto Rico. Technical Report Submitted to NOAA Law Enforcement Division, Guaynabo, 143.
[42] Hernández-Delgado, E.A., Hutchinson-Delgado, Y.M., Laureano, R., Hernández-Pacheco, R., Ruiz-Maldonado, T.M., Oms, J. and Díaz, P.L. (2011) Sediment Stress, Water Turbidity and Sewage Impacts on Threatened Elkhorn Coral (Acropora palmata) Stands at Vega Baja, Puerto Rico. Proceedings of the Gulf and Caribbean Fisheries Institute, 63, 83-92.
[43] Hernández-Delgado, E.A., Alvarado, A., Laureano, R., Flynn, K. and Griffin, S. (2011) Seawall Construction Activities Cause a Localized Mass Mortality of Threatened Elkhorn Coral (Acropora palmata) at Vega Baja, Puerto Rico. Proceedings of the Gulf and Caribbean Fisheries Institute, 63, 511.
[44] Shannon, C.E. and Weaver, W. (1948) The Mathematical Theory of Communication. University of Illinois Press, Urbana, 1-117.
[45] Pielou, E.C. (1966) The Measurement of Diversity in Different Types of Biological Collections. Journal of Theoretical Biology, 13, 131-144.
[46] Clarke, K.R. and Warwick, R.M. (2001) Change in Marine Communities: An Approach to Statistical Analysis and Interpretation. 2nd Edition, PRIMER-E Ltd., Plymouth Marine Laboratory, Plymouth.
[47] Anderson, M.J., Gorley, R.N. and Clarke, K.R. (2008) PERMANOVA + for PRIMER: Guide to Software and Statistical Methods. PRIMER-E, Plymouth.
[48] Bray, J.R. and Curtis, J.T. (1957) An Ordination of the Upland Forest Communities of Southern Wisconsin. Ecological Monographs, 27, 325-349.
[49] Otero, E. (2009) Spatial and Temporal Patterns of Water Quality Indicators in Reef Systems of Southwestern Puerto Rico. Caribbean Journal of Science, 45, 168-180.
[50] Lapointe, B.E. and Matzie, W.R. (1996) Effects of Stormwater Nutrient Discharges on Eutrophication Processes in Nearshore Waters of the Florida Keys. Estuaries, 19, 422-435.
[51] Sekar, R., Kaczmarsky, L. and Richardson, L. (2008) Microbial Community Composition of Black Band Disease on the Coral Host Siderastrea siderea from Three Regions of the Wider Caribbean. Marine Ecology Progress Series, 362, 85-98.
[52] Tomascik, T. and Sander, F. (1985) Effects of Eutrophication on Reef-Building Corals. I. Growth Rate of the Reef-Building Coral Montastrea annularis. Marine Biology, 87, 143-155.
[53] Tomascik, T. and Sander, F. (1987) Effects of Eutrophication on Reef-Building Corals. III. Reproduction of the Reef-Building Coral Porites porites. Marine Biology, 94, 77-84.
[54] Tomascik, T. (1991) Settlement Patterns of Caribbean Scleractinian Corals on Artificial Substrata along a Eutrophication Gradient, Barbados, West Indies. Marine Ecology Progress Series, 77, 261-269.
[55] Hughes, T.P. (1994) Catastrophes, Phase Shifts, and Large-Scale Degradation of a Caribbean Coral Reef. Science, 265, 1547-1551.
[56] Hubbard, D.K. (1986) Sedimentation as a Control of Reef Development: St. Croix, U.S.V.I. Coral Reefs, 5, 117-125.
[57] Rogers, C.S. (1990) Responses of Coral Reefs and Reef Organisms to Sedimentation. Marine Ecology Progress Series, 62, 185-202.
[58] Brown, B.E. (1997) Disturbances to Reefs in Recent Times. In: Birkeland, C., Ed., Life and Death of Coral Reefs, Kluwer Academic Publishers, Boston, Massachusetts, 354-379.
[59] Brown, B.E. and Howard, L.S. (1985) Assessing the Effects of “Stress” on Reef Corals. Advances in Marine Biology, 22, 1-63.
[60] Hoegh-Guldberg, O. (1999) Climate Change, Coral Bleaching and the Future of the World’s Coral Reefs. Marine and Freshwater Research, 50, 839-866.
[61] Veron, J.E.N., Hoegh-Guldberg, O., Lenton, T.M., Lough, J.M., Obura, D.O., Pearce-Kelly, P., Sheppard, C.R.C., Spalding, M., Stafford-Smith, M.G. and Rogers, A.D. (2009) The Coral Reef Crisis: The Critical Importance of <350 ppm CO2. Marine Pollution Bulletin, 58, 1428-1436.
[62] Rogers, C.S. and Miller, J. (2006) Permanent “Phase Shifts” or Reversible Declines in Coral Cover? Lack of Recovery of Two Coral Reefs in St. John, US Virgin Islands. Marine Ecology Progress Series, 306, 103-114.
[63] Miller, J., Muller, E., Rogers, C., Waara, R., Atkinson, A., Whelan, K.R.T., Patterson, M. and Witcher, B. (2009) Coral Disease Following Massive Bleaching in 2005 Causes 60% Decline in Coral Cover on Reefs in the US Virgin Islands. Coral Reefs, 28, 925-937.
[64] Edmunds, P.J. (2013) Decadal-Scale Changes in the Community Structure of Coral Reefs of St. John, US Virgin Islands. Marine Ecology Progress Series, 489, 107-123.
[65] Hernández-Pacheco, R., Hernández-Delgado, E.A. and Sabat, A.M. (2011) Demographics of Bleaching in the Caribbean Reef-Building Coral: Montastraea annularis. Ecosphere, 2, art9.
[66] Buddemeier, R.W., Lane, D.R. and Martinich, J.A. (2010) Modeling Regional Coral Reef Responses to Global Warming and Changes in Ocean Chemistry: Caribbean Case Study. Climatic Change, 109, 1-23.
[67] Lane, D.R., Ready, R.C., Buddemeier, R.W., Martinich, J.A., Cardamone-Shouse, K. and Wobus, C.W. (2013) Quantifying and Valuing Potential Climate Change Impacts on Coral Reefs in the United States: Comparison of Two Scenarios. PLoS ONE, 8, e82579.
[68] Roff, G. and Mumby, P.J. (2012) Global Disparity in the Resilience of Coral Reefs. Trends in Ecology and Evolution, 27, 404-413.
[69] Rau, G.H., McLeod, E.L. and Hoegh-Guldberg, O. (2012) The Need for New Ocean Conservation Strategies in a HighCarbon Dioxide World. Nature Climate Change, 2, 720-724.
[70] Hughes, T.P., Linares, C., Dakos, V., Van de Leemput, I.A. and Van Nes, E.H. (2013) Living Dangerously on Borrowed Time during Slow, Unrecognized Regime Shifts. Trends in Ecology and Evolution, 28, 149-155.

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