Indicators

Nutrients

Total Nitrogen - Discrete

Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Nitrogen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 8222 36 1990 - 2025 0.466 0.2315 0.37151 0.00729 0

Monthly average total nitrogen increased by 0.01 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Phosphorus - Discrete

Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Phosphorus
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 6513 34 1992 - 2025 0.032 0.60348 0.00437 0.0016 0

Monthly average total phosphorus increased by less than 0.01 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Quality

Dissolved Oxygen - Discrete

Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Dissolved Oxygen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field No significant trend 153189 39 1985 - 2025 6.71 0.02113 6.4604 0.00245 0.5065

Dissolved oxygen showed no detectable trend between 1985 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen - Continuous

Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Dissolved Oxygen
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
02326526 No significant trend 3342 10 2016 - 2025 6.7 0.14 6.61 0.04 0.0549
02323566 Significantly decreasing trend 3879 12 2014 - 2025 1.1 -0.38 1.49 -0.06 0
02313700 No significant trend 2425 8 2018 - 2025 5.5 -0.12 5.93 -0.03 0.1723
02326516 No significant trend 1583 6 2020 - 2025 2.6 -0.2 2.72 -0.03 0.1262
BBSDB No significant trend 184327 10 2007 - 2016 7.3 -0.05 7.46 -0.01 0.6066
BBSCK Insufficient data to calculate trend 14788 1 2023 - 2023 6.7 - - - -
BBSST No significant trend 146149 6 2019 - 2024 6.9 -0.01 6.71 0 1
BBSSK Significantly increasing trend 134287 10 2004 - 2015 7.1 0.28 6.6 0.09 0.0023
BBSSW No significant trend 182327 8 2009 - 2016 6.2 0 6 0 1

At one program location, monthly average dissolved oxygen increased by 0.09 mg/L per year. At one program location, monthly average dissolved oxygen decreased by 0.06 mg/L per year. No detectable change in monthly average dissolved oxygen was observed at six locations. There was insufficient data to fit a model for one location.

Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Discrete

Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Dissolved Oxygen Saturation
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly decreasing trend 1912 21 1999 - 2025 67 -0.21256 84.05593 -0.78413 7e-04

Monthly average dissolved oxygen saturation decreased by 0.78% per year.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Continuous

Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Dissolved Oxygen Saturation
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
BBSDB Significantly decreasing trend 183530 10 2007 - 2016 97.6 -0.3 100.88 -0.81 3e-04
BBSCK Insufficient data to calculate trend 19834 1 2023 - 2023 95.7 - - - -
BBSSK No significant trend 134196 10 2004 - 2015 91.8 0.12 93.37 0.36 0.2612
BBSST No significant trend 149203 6 2019 - 2024 93.3 0.08 92.61 0.26 0.4975
BBSSW No significant trend 182158 8 2009 - 2016 75.8 -0.05 79.14 -0.25 0.6835

At one program location, monthly average dissolved oxygen saturation decreased by 0.81% per year. No detectable change in monthly average dissolved oxygen saturation was observed at three locations. There was insufficient data to fit a model for one location.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Discrete

Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Seasonal Kendall-Tau Results for - Salinity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
All Significantly decreasing trend 158388 41 1964 - 2025 23.3 -0.09664 24.65953 -0.0556 0.0062

Monthly average salinity decreased by 0.06 ppt per year.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Continuous

Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Salinity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
02323592 Significantly decreasing trend 6064 16 2000 - 2015 0.1 -0.13 0.18 0 0.0156
291652083064100 Insufficient data to calculate trend 827 1 2000 - 2000 6.7 - - - -
02326550 Significantly increasing trend 2507 8 2002 - 2009 1.7 0.48 0.09 0.76 0
02313700 Significantly increasing trend 1601 7 2002 - 2009 2.1 0.52 0.1 0.53 0
291842083085100 Insufficient data to calculate trend 584 1 2000 - 2000 3.7 - - - -
BBSDB Significantly decreasing trend 265544 10 2007 - 2016 30.6 -0.53 33.78 -0.75 0
BBSCK Insufficient data to calculate trend 14782 1 2023 - 2023 29.2 - - - -
BBSSK Significantly decreasing trend 178356 10 2004 - 2015 29.6 -0.22 30.77 -0.21 0.0197
BBSST No significant trend 156720 6 2019 - 2024 28.5 0.08 27.59 0.15 0.516
BBSSW Significantly decreasing trend 221696 8 2009 - 2016 7.5 -0.23 10.39 -0.65 0.016

At two program locations, monthly average salinity increased by 0.53 ppt per year at one site and by 0.76 ppt per year at the other. At four program locations, monthly average salinity decreased between less than 0.01 and 0.75 ppt per year. No detectable change in monthly average salinity was observed at one location. There was insufficient data to fit a model for three locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of salinity continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Discrete

Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Water Temperature
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly increasing trend 159977 42 1964 - 2025 24.1 0.22576 21.14632 0.04221 0

Monthly average water temperature increased by 0.04°C per year.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

National Water Information System - 7

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Water Temperature
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
02326050 Significantly increasing trend 1695 5 2021 - 2025 21.9 0.32 20.48 0.32 0.0074
02326526 No significant trend 3399 10 2016 - 2025 21.6 -0.06 21.21 -0.01 0.4654
02313700 Significantly increasing trend 4097 15 2002 - 2025 23.0 0.14 22.58 0.03 0.0377
02323592 No significant trend 13025 23 2000 - 2025 23.3 -0.02 22.57 0 0.7205
02326516 Significantly increasing trend 1616 6 2020 - 2025 20.6 0.32 20.54 0.02 0.0107
02323566 Significantly increasing trend 4020 12 2014 - 2025 22.6 0.77 22.39 0.04 0
02326550 Significantly increasing trend 4930 13 2002 - 2025 22.4 0.21 21.25 0.04 0.0017
291842083085100 Insufficient data to calculate trend 542 1 2000 - 2000 23.1 - - - -
02327022 Insufficient data to calculate trend 658 3 2023 - 2025 21.3 - - - -
291652083064100 Insufficient data to calculate trend 473 1 2000 - 2000 26.1 - - - -

At five program locations, monthly average water temperature increased between 0.02 and 0.32°C per year. At one program location, monthly average water temperature decreased by 0.37°C per year. No detectable change in monthly average water temperature was observed at five locations. There was insufficient data to fit a model for four locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Big Bend Seagrasses Aquatic Preserves Continuous Water Quality Monitoring - 471

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Water Temperature
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
BBSDB No significant trend 265988 10 2007 - 2016 23.2 0.08 22.34 0.04 0.2922
BBSCK Insufficient data to calculate trend 22232 1 2023 - 2023 26.4 - - - -
BBSSK Significantly decreasing trend 179213 10 2004 - 2015 21.7 -0.33 25.19 -0.37 2e-04
BBSST No significant trend 163227 6 2019 - 2024 23.5 0.1 24.44 0.1 0.516
BBSSW No significant trend 227996 8 2009 - 2016 23.7 0.02 23.09 0.01 0.9025

At five program locations, monthly average water temperature increased between 0.02 and 0.32°C per year. At one program location, monthly average water temperature decreased by 0.37°C per year. No detectable change in monthly average water temperature was observed at five locations. There was insufficient data to fit a model for four locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Discrete

Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - pH
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field No significant trend 110554 38 1964 - 2025 8 -0.01123 7.8931 -0.00021 0.8406

pH showed no detectable trend between 1964 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Continuous

Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - pH
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
02326516 Significantly increasing trend 1485 6 2020 - 2025 7.7 0.4 7.63 0.02 5e-04
02326526 Significantly increasing trend 3148 10 2016 - 2025 8.0 0.19 7.97 0.02 0.0158
02323566 No significant trend 3666 12 2014 - 2025 7.2 -0.13 7.22 0 0.0573
02313700 No significant trend 2388 8 2018 - 2025 7.6 0.16 7.6 0.01 0.1127
BBSDB Significantly decreasing trend 250183 10 2007 - 2016 8.1 -0.28 8.17 -0.02 4e-04
BBSCK Insufficient data to calculate trend 18185 1 2023 - 2023 8.1 - - - -
BBSST No significant trend 153335 6 2019 - 2024 8.0 -0.01 7.95 0 0.9412
BBSSK Significantly decreasing trend 168278 10 2004 - 2015 8.1 -0.37 8.28 -0.04 0
BBSSW Significantly decreasing trend 224733 8 2009 - 2016 7.6 -0.29 7.8 -0.06 0.0017

At two program locations, monthly average pH increased by 0.02 pH units per year. At three program locations, monthly average pH decreased between 0.02 and 0.06 pH units per year. No detectable change in monthly average pH was observed at three locations. There was insufficient data to fit a model for one location.

Map showing location of ph continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of ph continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Clarity

Turbidity - Discrete

Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Turbidity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly decreasing trend 42959 36 1990 - 2025 3.4 -0.10162 4.67542 -0.03395 0.0033

Monthly average turbidity decreased by 0.03 NTU per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Turbidity - Continuous

Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Turbidity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
BBSDB Significantly increasing trend 224613 10 2007 - 2016 1 0.49 1.47 1.22 0
BBSCK Insufficient data to calculate trend 23243 1 2023 - 2023 7 - - - -
BBSSK No significant trend 165043 10 2004 - 2015 5 0.11 6.35 0.3 0.1867
BBSST Significantly decreasing trend 157393 6 2019 - 2024 4 -0.31 6.73 -0.55 0.0115
BBSSW Significantly decreasing trend 202699 8 2009 - 2016 6 -0.35 12.41 -0.99 1e-04

At one program location, monthly average turbidity increased by 1.22 NTU per year. At two program locations, monthly average turbidity decreased by 0.55 NTU per year at one site and by 0.99 NTU per year at the other. No detectable change in monthly average turbidity was observed at one location. There was insufficient data to fit a model for one location.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of turbidity continuous water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Suspended Solids - Discrete

Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Suspended Solids
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly decreasing trend 3003 36 1990 - 2025 4 -0.30015 5.15595 -0.06667 0

Monthly average total suspended solids decreased by 0.07 mg/L per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Uncorrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Chlorophyll a, Uncorrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 6287 36 1990 - 2025 1.2 0.22213 0.7769 0.06333 0

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.06 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Corrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Chlorophyll a, Corrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 4920 31 1995 - 2025 1.1 0.18637 1.26069 0.06452 0

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.06 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Secchi Depth - Discrete

Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Seasonal Kendall-Tau Results for - Secchi Depth
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly increasing trend 62713 37 1986 - 2025 -0.9 0.12827 -1.37205 0.00602 4e-04

Monthly average Secchi depth became shallower by 0.01 m per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Colored Dissolved Organic Matter - Discrete

Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Colored Dissolved Organic Matter
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 2889 25 2001 - 2025 17.6 0.4847 -12.05154 1.8 0

Monthly average colored dissolved organic matter increased by 1.8 PCU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Big Bend Seagrasses Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.