Biogeochemical classification of South Florida’s estuarine and coastal waters

Briceño, Henry O.; Boyer, Joseph N.; Castro, Joffre; Harlem, Peter

doi:10.1016/j.marpolbul.2013.07.034

Cited by 32 publications

(28 citation statements)

References 36 publications

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“…Higher spectral c p , a p , b p , and lower E d were observed during low tide in the patch reef (red dotted lines in Figure 5A,C,E,I), indicating the influx of water with higher concentrations of suspended and dissolved materials from shallower coastal areas to the patch reef. These observations corresponded to previous studies in the Florida Keys that showed higher turbidity and lower light intensity nearshore the Keys [63,64].…”

Section: Discussionsupporting

confidence: 92%

“…We found relatively high values of total absorption (a p + a g ) (May a tp443q > 0.21 m´1, Oct. a tp443q > 0.14 m´1; Figure 4) compared to previously reported values near the Upper Florida Keys at the Atlantic side in much deeper water (~´17 m) during summer (a tp440q < 0.1 m´1) [32]. In general, the Lower Keys have higher turbidity compared to the Upper Keys [64], although higher productivity has been observed in seagrass and crustose coralline algae communities in the Lower Keys [65,66]. This may be due in part to higher nutrient concentrations in shallow waters around the Lower Keys from land-based sources [64].…”

Section: Discussionsupporting

confidence: 47%

“…In general, the Lower Keys have higher turbidity compared to the Upper Keys [64], although higher productivity has been observed in seagrass and crustose coralline algae communities in the Lower Keys [65,66]. This may be due in part to higher nutrient concentrations in shallow waters around the Lower Keys from land-based sources [64]. Additional research is needed to determine the effects of nutrient loads on combined benthic and water column productivity in the Florida Keys.…”

Section: Discussionmentioning

confidence: 99%

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Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys

et al. 2016

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Light availability is an important factor driving primary productivity in benthic ecosystems, but in situ and remote sensing measurements of light quality are limited for coral reefs and seagrass beds. We evaluated the productivity responses of a patch reef and a seagrass site in the Lower Florida Keys to ambient light availability and spectral quality. In situ optical properties were characterized utilizing moored and water column bio-optical and hydrographic measurements. Net ecosystem productivity (NEP) was also estimated for these study sites using benthic productivity chambers. Our results show higher spectral light attenuation and absorption, and lower irradiance during low tide in the patch reef, tracking the influx of materials from shallower coastal areas. In contrast, the intrusion of clearer surface Atlantic Ocean water caused lower values of spectral attenuation and absorption, and higher irradiance in the patch reef during high tide. Storms during the studied period, with winds >10 m¨s´1, caused higher spectral attenuation values. A spatial gradient of NEP was observed, from high productivity in the shallow seagrass area, to lower productivity in deeper patch reefs. The highest daytime NEP was observed in the seagrass, with values of almost 0.4 g¨O 2¨m´2¨h´1 . Productivity at the patch reef area was lower in May than during October 2012 (mean = 0.137 and 0.177 g¨O 2¨m´2¨h´1 , respectively). Higher photosynthetic active radiation (PAR) levels measured above water and lower light attenuation in the red region of the visible spectrum (~666 to~699 nm) had a positive correlation with NEP. Our results indicate that changes in light availability and quality by suspended or resuspended particles limit benthic productivity in the Florida Keys.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 47%

Section: Discussionmentioning

confidence: 99%

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Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys

et al. 2016

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“…South Florida coastal waters are characterized by complex hydrology and well studied biogeochemical gradients (Briceño et al, 2013 (Lee and Williams, 1999). The distribution of S. filiforme across the Florida Keys ranges from marginal and patchy in Florida Bay, to sparse in offshore intermixed beds on the Atlantic side, to dense, monospecific stands along the Middle and Lower Keys on the Gulf of Mexico side (Fourqurean et al, 2003;2001).…”

Section: S Filiforme Populates Expansive Meadows Contributing To Thmentioning

confidence: 99%

Genetic Diversity and Population Connectivity of Syringodium filiforme in the Florida Keys, USA and Northeastern Subtropical Atlantic Region

Bijak¹

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Syringodium filiforme is a seagrass that populates extensive meadows in South Florida and other coastal areas throughout the tropical and subtropical Atlantic. Such meadows are habitat-forming, support an abundance of biota, and confer economic and ecological benefits.The ability of this species to colonize bare areas following disturbance has been attributed to its fast rhizome elongation rates. The central research problem addressed in this thesis is how this rapid clonal growth strategy influences sexual reproduction and overall population survival in S. A total of 17 polymorphic microsatellite markers were developed for population genetic analysis of S. filiforme at the onset of this study. Sixteen populations from the Florida Keys and single populations from Florida Bay, Tampa Bay, Bermuda and the Bahamas were sampled and analyzed using these markers to determine how genetic diversity partitions within and among sampled populations. Allelic diversity and heterozygosity-based statistics were used to measure genetic diversity, and population structure and gene flow were analyzed using FST-and modelbased methods.The markers used in this study proved to be powerful, as the probability of genet identity The findings from this study suggest S. filiforme maintains moderate to high levels of heterozygosity and higher than expected genetic diversity even though it is a highly clonal seagrass. Population structure clearly develops across the complex topography and hydrology of the Florida Keys, in which Gulf and Atlantic populations represent distinct genetic clusters. Gulf and Atlantic genetic disjunctions have been observed for a number of other marine organisms in the southeastern U.S., suggesting the Florida peninsula represents a phylogeographic break for S. filiforme and several other taxa. In addition to geologic history, contemporary isolating mechanisms such as limited propagule exchange mediated by ocean currents may contribute to lower genetic connectivity between Florida, Bermuda and the Bahamas populations.iv

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“…In the case of nitrogen, it is mostly found as total organic nitrogen (TON) in the Everglades and near-shore waterbodies, but oxidized forms of inorganic nitrogen such as nitrate, nitrite, and ammonia have been observed as well (Briceño et al 2013;Lietz 1999 …”

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A Spatial and Temporal Analysis of Land Use and Water Quality in Southern Miami Dade County

Londono¹

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County. The following research questions and hypothesis will guide this thesis.• Question: What is the status of nutrient concentrations in the canals of southern Miami Dade County that flow through agricultural lands? 2 o Hypothesis: Nutrient concentrations in the canals will differ, considering the different land use practices. There will be differences between canals that flow through urban-residential areas and canals that flow through agricultural lands. Certain types of agricultural practices may influence water quality at specific sites. Those land use practices related to specific sites will be identified.• Question: Do the nutrient concentrations among the canals differ from each other?o Hypothesis: The nutrient concentrations across not only the canals, but across canal sites will differ considering the different land use compositions at each site.• Also, the higher levels of phosphorus in surface waters lead to the increased growth of organisms such as algae and duckweed, which changes the habitat of aquatic and nonaquatic wildlife (Bates et al. 2002). In the case of nitrogen, it is mostly found as total organic nitrogen (TON) in the Everglades and near-shore waterbodies, but oxidized forms of inorganic nitrogen such as nitrate, nitrite, and ammonia have been observed as well (Briceño et al. 2013;Lietz 1999 where: X _ is the sample mean n is the observed sample sizeThe sample is then ordered from smallest to largest as shown below,Also, for the observed sample size n, coefficients for the Shapiro-Wilk test must be looked up which are provided in statistical textbooks and integrated in computer statistical software (Conover 1999). The Shapiro-Wilk test statistic T 3 is derived as shown in Equation 2:where: X SFWMD 1995). For NH3-N, both thresholds were used for the summary statistics table.These NOx-N and NH3-N nutrient criteria were also used by Carey et al. (2011) for the Biscayne Bay watershed study regarding nutrient discharges into the bay. Objective 2The second objective is to determine whether or not the water quality stations have similar distribution functions of nutrient concentrations of TP, NOx-N, and NH3-N.In order to accomplish this, the data for each corresponding water quality station need to be ranked by degree of nutrient impairment. where: N = total number of observations n i = size of random sample k = random sample from populationwhere: i = 1, 2, …, k X ij = ith random sample of size n i R(X ij )= rank assigned to X ijThe test statistic T is defined by Equation 5 as: If the null hypothesis can be rejected, then it can be determined which pairs of water quality stations differ by employing a pairwise comparison procedure that utilizes the following inequality equation, Equation 8 devised by Sachs (1997):where: R i and R j are the rank sums of two samples If this inequality is satisfied then it can be said that water quality stations i and j are different in terms of their distributions. Also, box-plots depicting the nutrientconcentrations for each water quality station in each time...

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Biogeochemical classification of South Florida’s estuarine and coastal waters

Cited by 32 publications

References 36 publications

Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys

Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys

Genetic Diversity and Population Connectivity of Syringodium filiforme in the Florida Keys, USA and Northeastern Subtropical Atlantic Region

A Spatial and Temporal Analysis of Land Use and Water Quality in Southern Miami Dade County

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