Land-based nutrient enrichment of the Buccoo Reef Complex and fringing coral reefs of Tobago, West Indies.

Tobago's fringing coral reefs (FR) and Buccoo Reef Complex (BRC) can be affected locally by wastewater and stormwater, and regionally by the Orinoco River. In 2001, seasonal effects of these inputs on water-column nutrients and phytoplankton (Chl a), macroalgal C:N:P and delta(15)N values, and biocover at FR and BRC sites were examined. Dissolved inorganic nitrogen (DIN, particularly ammonium) increased and soluble reactive phosphorus (SRP) decreased from the dry to wet season. Wet season satellite and Chl a data showed that Orinoco runoff reaching Tobago contained chromophoric dissolved organic matter (CDOM) but little Chl a, suggesting minimal riverine nutrient transport to Tobago. C:N ratios were lower (16 vs. 21) and macroalgal delta(15)N values higher (6.6 per thousand vs. 5.5 per thousand) in the BRC vs. FR, indicating relatively more wastewater N in the BRC. High macroalgae and low coral cover in the BRC further indicated that better wastewater treatment could improve the health of Tobago's coral reefs.

[1]  J. Morell,et al.  Nitrogen cycling and anthropogenic impact in the tropical interamerican seas , 1999 .

[2]  R. Laydoo,et al.  Historic records of phosphorus levels in the reef-building coral Montastrea annularis from Tobago, West Indies , 1998 .

[3]  Ricardo M Letelier,et al.  An analysis of chlorophyll fluorescence algorithms for the moderate resolution imaging spectrometer (MODIS) , 1996 .

[4]  Z. M. Leão,et al.  Nutrification impacts on coral reefs from northern Bahia, Brazil , 2000, Hydrobiologia.

[5]  B. Lapointe.  Phosphorus-rich waters at Glovers Reef, Belize? , 2004, Marine pollution bulletin.

[6]  William J. Kimmerer,et al.  Kaneohe Bay Sewage Diversion Experiment: Perspectives on Ecosystem Responses to Nutritional Perturbation , 1981 .

[7]  J. Morse,et al.  The chemistry of orthophosphate uptake from seawater on to calcite and aragonite , 1978 .

[8]  J. Agard,et al.  The Lesser Antilles, Trinidad and Tobago , 2000 .

[9]  B. Lapointe,et al.  Modification of tropical reef community structure due to cultural eutrophication: the southwest coast of Martinique , 1993 .

[10]  B. Lapointe,et al.  Anthropogenic nutrient enrichment of seagrass and coral reef communities in the Lower Florida Keys: discrimination of local versus regional nitrogen sources , 2004 .

[11]  R. Berner,et al.  Dissolution kinetics of calcium carbonate in sea water; IV, Theory of calcite dissolution , 1974 .

[12]  S. Andréfouët,et al.  Physical connectivity in the Mesoamerican Barrier Reef System inferred from 9 years of ocean color observations , 2009, Coral Reefs.

[13]  B. Lapointe.  Nutrient thresholds for bottom‐up control of macroalgal blooms on coral reefs in Jamaica and southeast Florida , 1997 .

[14]  R. Berner,et al.  Dissolution kinetics of calcium carbonate in sea water; I, A kinetic origin for the lysocline , 1972 .

[15]  F. Muller‐Karger,et al.  Red tide detection and tracing using MODIS fluorescence data: A regional example in SW Florida coastal waters , 2005 .

[16]  B. Lapointe,et al.  Nutrient couplings between on-site sewage disposal systems, groundwaters, and nearshore surface waters of the Florida Keys , 1990 .

[17]  B. Lapointe,et al.  Nutrient availability to marine macroalgae in siliciclastic versus carbonate-rich coastal waters , 1992 .

[18]  S. Andréfouët,et al.  Revisiting coral reef connectivity , 2002, Coral Reefs.

[19]  Chuanmin Hu,et al.  The 2002 ocean color anomaly in the Florida Bight: A cause of local coral reef decline? , 2003 .

[20]  B. Lapointe,et al.  The use of delta(15)N in assessing sewage stress on coral reefs. , 2009, Marine pollution bulletin.

[21]  B. Lapointe,et al.  Macroalgal blooms on southeast Florida coral reefs I. Nutrient stoichiometry of the invasive green alga Codium isthmocladum in the wider Caribbean indicates nutrient enrichment , 2005 .

[22]  W. Boynton,et al.  NUTRIENT ANALYTICAL SERVICES LABORATORY STANDARD OPERATING PROCEDURES , 2004 .

[23]  C. Sheppard.  Seas at the Millennium: An Environmental Evaluation , 2000 .

[24]  James W. Porter,et al.  The Everglades, Florida Bay, and coral reefs of the Florida Keys : an ecosystem sourcebook , 2001 .

[25]  K. Bjorndal,et al.  Historical Overfishing and the Recent Collapse of Coastal Ecosystems , 2001, Science.

[26]  E. Laws,et al.  Effect of Sewage Enrichment on the Phytoplankton Population of a Subtropical Estuary , 1979 .

[27]  Chuanmin Hu,et al.  Linkages between coastal runoff and the Florida Keys ecosystem: A study of a dark plume event , 2004 .

[28]  T. Hughes.  Catastrophes, Phase Shifts, and Large-Scale Degradation of a Caribbean Coral Reef , 1994, Science.

[29]  Robin L. Dennis,et al.  Atmospheric deposition of nitrogen: Implications for nutrient over-enrichment of coastal waters , 2002 .

[30]  P. Bell,et al.  Eutrophication and coral reefs—some examples in the Great Barrier Reef lagoon , 1992 .

[31]  B. Lapointe,et al.  Nutrient inputs from the watershed and coastal eutrophication in the Florida keys , 1992 .

[32]  J. McCarthy,et al.  The Dynamics of Nitrogen and Phosphorus Cycling in the Open Waters of the Chesapeake Bay , 1975 .

[33]  M. Hunter,et al.  Playing Chutes and Ladders: Heterogeneity and the Relative Roles of Bottom‐Up and Top‐Down Forces in Natural Communities , 1992, Ecology.

[34]  G. Likens.  Biogeochemistry, the watershed approach: some uses and limitations , 2001 .

[35]  K. Lockhart,et al.  Turks and Caicos Islands 2006 coral reef assessment: Large-scale environmental and ecological interactions and their management implications , 2007 .

[36]  B. Lapointe,et al.  Macroalgal blooms on southeast Florida coral reefs: II. Cross-shelf discrimination of nitrogen sources indicates widespread assimilation of sewage nitrogen , 2005 .

[37]  R. E. Johannes.  Chapter 2. Pollution and Degradation of Coral Reef Communities , 1975 .

[38]  B. Lapointe.  Phosphorus- and nitrogen-limited photosynthesis and growth of Gracilaria tikvahiae (Rhodophyceae) in the Florida Keys: an experimental field study , 1987 .

[39]  W. J. Mattson,et al.  Herbivory in relation to plant nitrogen content , 1980 .

[40]  S. Costanzo,et al.  A new approach for detecting and mapping sewage impacts. , 2001, Marine pollution bulletin.

[41]  B. Lapointe,et al.  Atmospheric nitrogen deposition from a remote source enriches macroalgae in coral reef ecosystems near Green Turtle Cay, Abacos, Bahamas. , 2005, Marine pollution bulletin.

[42]  A. Chau,et al.  A semi-automated method for the determination of inorganic, organic and total phosphate in sediments. , 1976, The Analyst.

[43]  V. Stoute,et al.  Phosphorus in sediments of a shallow bank influenced by sewage and sugar factory effluents in Trinidad, West Indies , 1998 .

[44]  A. Siung-Chang.  A review of marine pollution issues in the Caribbean , 1997 .

[45]  T. Platt,et al.  f-Ratio and its relationship to ambient nitrate concentration in coastal waters , 1987 .

[46]  F. Muller‐Karger,et al.  On the absorption of light in the Orinoco River plume , 2007 .

[47]  B. Lapointe,et al.  Nutrient-enhanced growth of Cladophora prolifera in harrington sound, bermuda: Eutrophication of a confined, phosphorus-limited marine ecosystem , 1989 .