Blooms of Karenia brevis (Davis) G. Hansen &amp; Ø. Moestrup on the West Florida Shelf: Nutrient sources and potential management strategies based on a multi-year regional study

Heil, Cynthia A.; Dixon, L. Kellie; Hall, Emily R.; Garrett, Matthew; Lenes, Jason M.; O’Neil, Judith M.; Walsh, Brianne M.; Bronk, Deborah A.; Killberg-Thoreson, Lynn; Hitchcock, Gary L.; Meyer, Kevin A.; Mulholland, Margaret R.; Procise, Leo A.; Kirkpatrick, Gary J.; Walsh, John J.; Weisberg, Robert W.

doi:10.1016/j.hal.2014.07.016

Cited by 55 publications

(45 citation statements)

References 82 publications

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“…In particular, worsening eutrophication is evident in bays and estuaries south of the Tampa Bay region that receive drainage from the greater Everglades ecosystem. In order to manage flooding in heavily populated areas in southeastern Florida, large quantities of water that naturally flowed through the Everglades from Lake Okeechobee, situated in the center of the Florida peninsula, are diverted to both coasts into the St. Lucie Estuary on the Atlantic coast (Kramer et al, 2018) and the Caloosahatchee River estuary on the Gulf of Mexico coast (Heil et al, 2014). These flows deliver large loads of nutrients from agricultural lands north of the lake or from internal phosphorus loads within the lake.…”

Section: Tampa Baymentioning

confidence: 99%

Barriers and Bridges in Abating Coastal Eutrophication

Boesch

2019

Front. Mar. Sci.

127

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Over the past 30 years concerted campaigns have been undertaken to reverse nutrient-driven eutrophication in coastal waters in Europe, North America, Asia, and Australia. Typically, eutrophication abatement has proven a more recalcitrant challenge than anticipated, with ecosystem improvements only recently beginning to emerge or falling short of goals. Reduction in nutrient loads has come mainly from advanced treatment of wastewaters and has lagged targets set for diffuse agricultural sources. Synthesis of the major campaigns-varying in terms of physical settings, ecosystem characteristics, nutrient sources, socio-economic drivers, and governance-identified barriers inhibiting eutrophication abatement and potential bridges to overcome them. Actionable science can be advanced by: application of the well-established and emerging knowledge and experience around the globe, client-responsive strategic research, and timely and conclusive adjudication of scientific controversies. More accountable governance requires: enduring engagement of high-level officials of the responsible governments; effective communication of the causes, risks and benefits to the public and stakeholders; quantitative and accountable allocation of responsibility for nutrient load reductions; and binding requirements, as opposed to simply voluntary actions. Effective reduction in nutrient loads requires: reduction strategies for both nitrogen and phosphorus; inclusion of actions that reduce atmospheric emissions of nitrogen in addition to direct inputs to waterways; efficacious regulations; public subsidies based on performance; limitations on biofuel production that increases nutrient loads; and enhancing the sinks and losses for legacy nutrients retained in soils and groundwater. Outcomes must be measured and strategies appropriately adjusted through: sustained monitoring of essential indicators and processes, the use of multiple models, truly adaptive management, and cautious interventions within the coastal ecosystem. The changing climate must be taken into account by reassessing achievable future conditions and seeking alternatives for mitigating and adapting to climate change that also reduce nutrient loads.

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Section: Tampa Baymentioning

confidence: 99%

Barriers and Bridges in Abating Coastal Eutrophication

Boesch

2019

Front. Mar. Sci.

127

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“…Magaña et al [1] reported that the frequency of red tides on the Texas coast increased over the period of 1996-2000 compared to earlier years. In both instances, availability of historical data limited the scope of inferences that could be drawn from study findings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Eutrophication is often cited as the cause of increases in harmful algal blooms (HABs) globally [11][12][13]. In the case of K. brevis however, its ability to use nutrients from a wide variety of sources has called into question the role of eutrophication as the main factor causing increased bloom frequency and intensity [10,14]. In Florida for example, studies suggest that a complex suite of environmental conditions determine bloom formation.…”

Section: Introductionmentioning

confidence: 99%

“…Briefly, downwelling conditions followed by upwelling concentrates K. brevis and subsequently transports it shoreward [6,15,16]. During transport, K. brevis is thought to acquire nutrients from sediment porewater (directly or via benthic flux), zooplankton excretions, bacterial remineralization, upwelled deep-water nutrients, and "leaky" Trichodesmium blooms in an otherwise oligotrophic environment [9,10,14]. It is only in the nearshore and estuarine environments where blooms come into contact with relatively high nutrient waters [9,10,14].…”

Section: Introductionmentioning

confidence: 99%

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An assessment of trends in the frequency and duration of Karenia brevis red tide blooms on the South Texas coast (western Gulf of Mexico)

et al. 2020

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Limited data coverage on harmful algal blooms (HABs) in some regions makes assessment of long-term trends difficult, and also impedes understanding of bloom ecology. Here, observations reported in a local newspaper were combined with cell count and environmental data from resource management agencies to assess trends in Karenia brevis "red tide" frequency and duration in the Nueces Estuary (Texas) and adjacent coastal waters, and to determine relationships with environmental factors. Based on these analyses, the Coastal Bend region of the Texas coast has experienced a significant increase in the frequency of red tide blooms since the mid-1990s. Salinity was positively correlated with red tide occurrence in the Nueces Estuary, and a documented long-term increase in salinity of the Nueces Estuary may be a major factor in the long-term increase in bloom frequency. This suggests that freshwater inflow management efforts in Texas should consider impacts on red tide habitat suitability (i.e., salinity regime) in downstream estuaries. Natural climate variability such as the El Niño-Southern Oscillation, which is strongly related to rainfall and salinity in Central and South Texas, was also an influential predictor of red tide presence/absence. Though no significant change in the duration of blooms was detected, there was a negative correlation between duration and temperature. Specifically, summer-like temperatures were not favorable to K. brevis bloom development. The relationships found here between red tide frequency/duration and environmental drivers present a new avenue of research that will aid in refining monitoring and forecasting efforts for red tides on the Texas coast and elsewhere. Findings also highlight the importance of factors (i.e., salinity, temperature) that are likely to be altered in the future due to both population growth in coastal watersheds and anthropogenic climate change.

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“…Based on cell physiology and concentrations, the blooms were characterized as being in one of three stages: initiation, maintenance, or termination. All three blooms were first detected and sampled in the area to the West/Southwest of Sanibel Island, but each bloom (Heil et al, 2014). In 2007, bloom concentrations of Karenia brevis were present at all stations sampled for zooplankton.…”

Section: Karenia Zooplankton Assemblagementioning

confidence: 99%