Water column and sediment nitrogen and phosphorus distribution patterns in the Florida Keys, USA

  title={Water column and sediment nitrogen and phosphorus distribution patterns in the Florida Keys, USA},
  author={Alina M. Szmant and Andrew Forrester},
  journal={Coral Reefs},
Measurements of the distribution patterns of nutrients (ammonium, nitrate, orthophosphate, total N and total P) and chlorophyll concentrations were conducted under an interdisciplinary program known as SEAKEYS, initiated because of concern that anthropogenic nutrients may be impacting Florida coral reefs. Samples were collected along transects that extended from passes or canals to 0.5 km offshore of the outermost reefs. Seven of the transects were either in the Biscayne National Park (BNP) and… Expand
Nitrogen enrichment, altered stoichiometry, and coral reef decline at Looe Key, Florida Keys, USA: a 3-decade study
Improved management of water quality at the local and regional levels could moderate N inputs and maintain more balanced N:P stoichiometry, thereby reducing the risk of coral bleaching, disease, and mortality under the current level of temperature stress. Expand
Anthropogenic nutrient enrichment of seagrass and coral reef communities in the Lower Florida Keys: discrimination of local versus regional nitrogen sources
Land-based nutrient pollution represents a significant human threat to coral reefs globally. We examined this phenomenon in shallow seagrass and coral reef communities between the Content KeysExpand
Responses of seagrass communities to fertilization along a gradient of relative availability of nitrogen and phosphorus in a carbonate environment
Patterns of relative nutrient availability in south Florida suggest spatial differences regarding the importance of nitrogen (N) and phosphorus (P) to benthic primary producers. We did a 14-month inExpand
Nitrogen and Phosphorus Exchange Among Tropical Coastal Ecosystems
The concentration and flux of nitrogen (N) and phosphorus (P) through mangrove wetlands, seagrass meadows, and coral reef habitats are mediated by a wide range of hydrodynamic and chemical pathwaysExpand
Episodic nutrient transport to Florida coral reefs
This study documents the changes in nutrient fluxes associated with internal tidal bores arriving on Florida Keys coral reefs and points to biological use of subthermocline nitrate brought onshore byExpand
Sources of dissolved inorganic nitrogen in a coastal lagoon adjacent to a major metropolitan area, Miami Florida (USA)
Abstract Between 2006 and 2007, a study was carried out to determine the relative importance of natural and anthropogenic input of nitrogen into Biscayne Bay (South Florida, USA) using δ13C and δ15NExpand
Nitrogen and oxygen isotopic signatures of subsurface nitrate seaward of the Florida Keys reef tract
Hydrographic and nutrient structure and the nitrogen and oxygen isotopic compositions (d 15 N and d 18 O) of the nitrate pool seaward of the Florida Keys reef tract were measured in Summer 2003.Expand
Water-Quality Variables Across Sekisei Reef, A Large Reef Complex in Southwestern Japan1
Abstract: At Sekisei Reef in southwestern Japan (24° N), coral cover dramatically decreased in the mid-1980s, probably due to a population outbreak of the coral predator Acanthaster planci. CoralExpand
The fate of wastewater-derived nitrate in the subsurface of the Florida Keys: Key Colony Beach, Florida
Abstract Shallow injection is the predominant mode of wastewater disposal for most tourist-oriented facilities and some residential communities in the US Florida Keys National Marine Sanctuary.Expand
Controls on Temporal and Spatial Variation of Nutrients in a Tropical Marine Artificial Reef: The Case of the Victory 8B on the Southeastern Brazilian Coast
The objective of this study was to evaluate the temporal and spatial nutrient distribution around the marine artificial reef (MAR) Victory 8B, a ship purposely sunk at Guarapari (20°40' S and 40°30'Expand


Nutrient inputs from the watershed and coastal eutrophication in the Florida keys
Widespread use of septic tanks in the Florida Keys increase the nutrient concentrations of limestone groundwaters that discharge into shallow nearshore waters, resulting in coastal eutrophication.Expand
Experimental evidence for nutrient limitation of seagrass growth in a tropical estuary with restricted circulation
Tissue nutrient content and nitrogen fixation assays suggest that phosphorus availability limits seagrass growth in unenriched conditions, but that nitrogen becomes limiting with the addition of bird excrement. Expand
Process Influencing Water Column Nutrient Characteristics and Phosphorus Limitation of Phytoplankton Biomass in Florida Bay, FL, USA:Inferences from Spatial Distributions
Abstract The concentrations of nutrients, dissolved and particulate organic matter, salinity and chlorophyll-α in the water column were measured over the period of June 1989 to August 1990 at aExpand
Eutrophication and trophic state classification of seagrass communities in the Florida Keys
Seagrass communities in the Florida Keys are receiving increased nutrient loadings from a variety of land-based human activities that are accelerating coastal eutrophication, We assessedExpand
Relationships between porewater nutrients and seagrasses in a subtropical carbonate environment
The hypothesis that sediment porewaters are the most important source of nutrients for seagrass growth is supported in this subtropical carbonate environment, as the availability of phosphorus in the porewater limits the development, and controls the species composition, of seagRass beds. Expand
Phosphorus and nitrogen in coral reef sediments
The occurrence of P and N in the sediments has been investigated on Davies Reef in the central region of the Great Barrier Reef Complex. Concentrations of inorganic P and N in the water were typicalExpand
Interstitial water and sediment chemistry of two cores from Florida Bay
ABSTRACT The interstitial water and sediment chemistry of cores from two different environments in Florida Bay, mangrove swamp and submerged mud bank, have been analyzed. The interstitial waterExpand
Evidence for phosphorus limitation in carbonate sediments of the seagrass
The finding of high root biomass relative to leaf biomass in these seagrass beds corroborates this evidence by depicting a method of plant adaptation that increases nutrient absorptive root surface area and establishes the likelihood that plant acquisition of phosphorus was limited. Expand
Dissolved nutrient fluxes from the nearshore sediments of Bowling Green Bay, central Great Barrier Reef Lagoon (Australia)
The fluxes of dissolved inorganic N, P, and Si from the nearshore sediments of the Great Barrier Reef Lagoon are significantly lower than those reported from sediments in temperate regions at similarExpand
Nutrient couplings between on-site sewage disposal systems, groundwaters, and nearshore surface waters of the Florida Keys
We performed a one-year study to determine the effects of on-site sewage disposal systems (OSDS, septic tanks) on the nutrient relations of limestone groundwaters and nearshore surface waters of theExpand