Abstract
The bloom forming dinoflagellate, Ceratium furca, has been linked with coastal eutrophication worldwide in tropical and subtropical locations. During the summer of 2007, an unusual 6-month long bloom of C. furca was observed in Pago Pago Harbor, Tutuila Island, American Samoa. Incidents of dinoflagellate blooms in this area have not been previously reported. The bloom was first reported in May and dissipated in November 2007. In February–March 2009, a similar C. furca bloom was observed. During both blooms, no fish mortality events were reported. Maximum cell counts were observed on September 20, 2007 at 9 200 cell/mL. At this time, total nitrogen was measured at 1.2 mg/L while total phosphate was below detection limits.
Changes in land use practices may have been the primary driver of these blooms. Intense fertilization of athletic fields coupled with ineffective management strategies is hypothesized to have a direct link to the increase in nutrients found in the Pago Pago Harbor and may have been the trigger for the initialization of these blooms. During 2008, the fields were not used due to an infestation of the fire ant, Solenopsis geminata. Once controlled, the fields were opened again in 2009 and fertilizers were applied in January, a month before the bloom was observed.
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References
Anderson D M, Glibert P M, Burkholder J M. 2002. Harmful algal blooms and eutrophication: nutrient sources, composition, and consequences. Estuaries, 25(4): 704–726.
Baek S H, Shimode S, Kikuchi T. 2006. Reproductive ecology of dominate dinoflagellate, Ceratium fura in the coastal area of Sagami Bay. Coast. Mar. Sci., 30: 344–352.
Baek S H, Shimode S, Han M S, Kikuchi T. 2008. Growth of dinoflagellates, Ceratium furca and Ceratium fusus in Sagami bay, Japan: The role of nutrients. Harmful Algae, 7: 729–739.
Elbrachter M. 1973. Population dynamics of Ceratium in coastal waters of the Kiel Bay. Oikos, 15: 43–48.
Graham H W. 1941. An oceanographic consideration of the dinoflagellate genus Ceratium. Ecol. Monogr., 11: 99–116.
Horner R A, Garrison D L, Plumley G F. 1997. Harmful algal bloom and red tide problems on the U.S. west coast. Limnol. Oceanogr., 42: 1 076–1 088.
Machida M, Fujitomi M, Hasegawa K, Kudoh T, Kai M, Kobayashi T, Kamiida T. 1999. Red tide of Ceratium furca along the Pacific coast of central Japan in 1997. Nippon Suisan Gakkaishi, 65: 755–756.
Nordli E. 1953. Salinity and temperature as controlling factors for distribution and mass occurrence of Ceratia. Blyttia, 2: 16–18.
Qasim S Z, Bhattathiri P M, Devassy V P. 1973. Growth kinetics and nutrients requirements of two tropical marine phytoplankters. Mar. Biol., 21: 299–304.
Smayda T J. 1997. Harmful algal blooms: their ecophysiology and general relevance to phytoplankton biomass in the sea. Limnol. Oceanogr., 42: 1 137–1 153.
Vitousek P M, Aber J, Howarth R W, Likens G E, Matson P A, Schindler B W, Schlesinger W H, Tilman G D. 1997. Human alteration of the global nitrogen cycle: causes and consequences. Ecol. Appl., 7: 737–750.
Wetterer J K, Vargo D L. 2003. Ants (Hymenoptera: Formicidae) of Samoa. Pac. Sci., 57(4): 409–419.
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Supported partially by U.S. Department of Agriculture (USDA) Grant (No. CRIS 0185945), USDA Region 9 Water Quality Coordination Grant (to DV), and NOAA Base Funds (SM)
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Morton, S.L., Shuler, A., Paternoster, J. et al. Coastal eutrophication, land use changes and Ceratium furca (Dinophyceae) blooms in Pago Pago Harbor, American Samoa 2007–2009. Chin. J. Ocean. Limnol. 29, 790–794 (2011). https://doi.org/10.1007/s00343-011-0507-7
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DOI: https://doi.org/10.1007/s00343-011-0507-7