Factors determining the distributions of total phosphorus, total nitrogen, and chlorophyll<i>a</i>in Florida lakes

Bachmann, Roger W.; Bigham, Dana L.; Hoyer, Mark V.

doi:10.1080/07438141.2011.646458

Cited by 22 publications

(24 citation statements)

References 30 publications

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“…For example, the 7700 lakes in the state of Florida naturally range from oligotrophic to hypereutrophic (Bachmann et al 2012) and have been grouped into 47 Lake Regions by the USEPA (Griffith et al 1997). These Florida lake regions have been aggregated into six TP zones with statistically significant differences in average concentrations of TP (Bachmann et al 2012). In the NLA, the Florida lakes are represented by only 1 lake out of the 14 reference lakes for the Coastal Plains nutrient ecoregion (USEPA 2010b) used for the determining lake condition with respect to TP and TN.…”

Section: Discussionmentioning

confidence: 99%

“…A paleolimnological survey of lakes in the state of Minnesota that was not based on a random sample of lakes showed some ecoregions with no changes in TP following European settlement, while some ecoregions did have some lakes that showed an increase in TP (Ramstack et al 2004). A study of the population of lakes in the state of Florida, by Bachmann et al (2012), using several different methods did not show widespread cultural eutrophication, though there are a small number of individual lakes that have been affected by anthropogenic activities.…”

Section: Discussionmentioning

confidence: 99%

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The extent that natural lakes in the United States of America have been changed by cultural eutrophication

Bachmann

Hoyer

2013

Limnology & Oceanography

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We used paleolimnological data for 240 lakes from the U.S. Environmental Protection Agency's (USEPA) 2007 National Lakes Assessment to estimate the extent that natural lakes in the coterminous United States have been changed by anthropogenic activities. In order to detect cultural eutrophication, we analyzed data on diatominferred concentrations of total nitrogen (TN), total phosphorus (TP), specific conductance (SC), and pH as determined from lake sediments from the tops and bottoms of sediment cores from 240 natural lakes where the bottom of the core was judged to represent conditions prior to European settlement. We found no statistically significant increases in the average concentrations of TN, while TP decreased by 14% in this population of lakes since the time of European settlement. We also analyzed data from 48 reference lakes used by the USEPA to determine the relative condition of the sample lakes. Paired t-tests showed the TN concentrations were not significantly different between the two time periods (p . 5%), while the average TP concentrations had significantly decreased by 26% since presettlement times (p , 5%). There were statistically significant increases in SC (17%) and pH (0.05 pH units). There were no statistically significant differences between the changes in TP, TN, SC, and pH in the 240 sample lakes and the changes in the 48 reference lakes. The proportions of lakes categorized as oligotrophic, mesotrophic, eutrophic, and hypereutrophic for the presettlement time period were not significantly different from the proportions found in 2007.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The extent that natural lakes in the United States of America have been changed by cultural eutrophication

Bachmann

Hoyer

2013

Limnology & Oceanography

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“…Lakes with lower values for pH and specific conductance had the highest LVI scores and would be considered the "healthiest," while those with the highest pH values tend to have the lowest LVI scores and would be declared impaired. Both pH and specific conductance are (Bachmann et al 2012) such that a high nutrient concentration in itself is not sufficient to label a Florida lake as impaired by accelerated cultural eutrophication. In the LVI developmental dataset, there was a significant relationship between the LVI and the Landscape Development Intensity index (R 2 = 0.29), possibly indicating that development around a lake would result in impairment with nutrients.…”

Section: Discussionmentioning

confidence: 99%

“…Other lakes are fed by groundwaters in contact with limestone and have waters with high values for pH, alkalinity, and dissolved solids (Baker et al 1988, Canfield and Hoyer 1988, Griffith et al 1997. In some lakes, groundwater inflows are in contact with deposits of phosphatic rocks, resulting in high TP concentrations (Bachmann et al 2012). The natural trophic states of Florida lakes range from oligotrophic to hypereutrophic, with a broad range of chemical compositions (Canfield and Hoyer 1988, Griffith et al 1997, Bachmann et al 2012).…”

Section: Florida Lakesmentioning

confidence: 99%

“…In some lakes, groundwater inflows are in contact with deposits of phosphatic rocks, resulting in high TP concentrations (Bachmann et al 2012). The natural trophic states of Florida lakes range from oligotrophic to hypereutrophic, with a broad range of chemical compositions (Canfield and Hoyer 1988, Griffith et al 1997, Bachmann et al 2012). …”

Section: Florida Lakesmentioning

confidence: 99%

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Effects of pH and specific conductance confound the use of the Florida Lake Vegetation Index to identify anthropogenic eutrophication

Bachmann

Hoyer

2013

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We found that the Florida Lake Vegetation Index (LVI) did not identify Florida lakes that were impaired due to excess loading of phosphorus or nitrogen from anthropogenic sources. The index is based on 4 plant metrics: the Coefficient of Conservatism of the dominant or co-dominant taxa, the percent of sensitive taxa, the percent of native taxa, and the percent of invasive exotic taxa. Our analysis of the data used by the Florida Department of Environmental Protection to establish and calibrate this biotic index found no link between nutrient concentrations and the LVI. The LVI was primarily associated with the pH and specific conductance of the lake waters, with the best scores found in acidic lakes and the poorest scores in more alkaline lakes. These variables are the result of natural gradients, not pollution, and are not included in the calculation of the LVI. Our study illustrates the importance of considering natural factors that determine the value of any index of biological integrity before it is used to indicate anthropogenic pollution.

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Impacts of residential fertilizer ordinances on Florida lacustrine water quality

Smidt

Avilés

Belshe

et al. 2022

Limnol Oceanogr Letters

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Despite the assumption that residential fertilizer ordinances improve regional water quality, their impacts across space and time largely remain unknown. Here, we analyze changes in water quality of lakes throughout the State of Florida from 1987 to 2018, comparing trends in water quality parameters before and after implementation of county‐wide fertilizer ordinances. We used a large dataset of publicly collected water quality data and linear mixed models to analyze ordinance impacts on total nitrogen, total phosphorus, chlorophyll a, and Secchi depth across 160 lakes throughout Florida. We further analyze water quality impacts relative to the type of ordinance (winter fertilizer ban, summer ban, nonseasonal ban, no ban). We found fertilizer ordinances favorably impacted lacustrine water quality, and winter (dry season) fertilizer bans had the greatest effect across all water quality metrics. Results of this study can be used to support the effectiveness of fertilizer ordinances across humid tropical and subtropical climate regions.

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Factors determining the distributions of total phosphorus, total nitrogen, and chlorophyllain Florida lakes

Cited by 22 publications

References 30 publications

The extent that natural lakes in the United States of America have been changed by cultural eutrophication

The extent that natural lakes in the United States of America have been changed by cultural eutrophication

Effects of pH and specific conductance confound the use of the Florida Lake Vegetation Index to identify anthropogenic eutrophication

Impacts of residential fertilizer ordinances on Florida lacustrine water quality

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