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 decreasing trend 34692 37 1989 - 2025 0.14636 -0.24149 0.25605 -0.00379 0

Monthly average total nitrogen decreased by less than 0.01 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 No significant trend 32400 37 1989 - 2025 0.00589 -0.04048 0.00637 -0.00002 0.2519

Total phosphorus showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 52269 37 1989 - 2025 6.30336 -0.00903 6.35318 -0.00076 0.7864

Dissolved oxygen showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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
FKLK Insufficient data to calculate trend 21525 1 2024 - 2024 6.2 - - - -
FKCB Insufficient data to calculate trend 16262 1 2024 - 2024 6.8 - - - -

There was insufficient data to fit a model for two locations.

Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 increasing trend 29573 31 1995 - 2025 94.78069 0.19145 91.89696 0.18908 0

Monthly average dissolved oxygen saturation increased by 0.19% per year.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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
FKLK Insufficient data to calculate trend 21525 1 2024 - 2024 91.9 - - - -
FKCB Insufficient data to calculate trend 16263 1 2024 - 2024 103.3 - - - -

There was insufficient data to fit a model for two locations.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 No significant trend 56024 48 1955 - 2025 36.18475 0.0374 34.53791 0.00961 0.279

Salinity showed no detectable trend between 1955 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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
1B No significant trend 86204 6 2003 - 2008 36.07 0.24 35.68 0.17 0.0543
245622080364200 Insufficient data to calculate trend 764 3 2002 - 2004 35.00 - - - -
245323080410100 Insufficient data to calculate trend 746 3 2002 - 2004 35.00 - - - -
FKLK Insufficient data to calculate trend 21517 1 2024 - 2024 36.10 - - - -
FKCB Insufficient data to calculate trend 16258 1 2024 - 2024 36.50 - - - -

No detectable change in monthly average salinity was observed at one location. There was insufficient data to fit a model for four locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 61726 47 1955 - 2025 27.3 0.23992 24.54436 0.03093 0

Monthly average water temperature increased by 0.03°C per year.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

Atlantic Oceanographic and Meteorological Laboratory (AOML) South Florida Program Moored Instrument Array - 2

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
1B Significantly increasing trend 86204 6 2003 - 2008 26.38 0.26 25.73 0.16 0.0392

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

National Data Buoy Center - 5

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
KYWF1 Significantly increasing trend 1522889 21 2005 - 2025 27.5 0.29 26.67 0.06 0
LONF1 No significant trend 205971 28 1992 - 2019 26.6 0.07 26.34 0.01 0.0825
MLRF1 Significantly increasing trend 256798 33 1987 - 2019 26.5 0.10 26.49 0.01 0.0043
SMKF1 Significantly increasing trend 154326 21 1988 - 2008 26.8 0.34 26.24 0.06 0
SANF1 No significant trend 117833 15 1991 - 2005 26.7 -0.03 26.69 0.00 0.6199

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

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
245622080364200 Insufficient data to calculate trend 853 3 2002 - 2004 28.3 - - - -
245323080410100 Insufficient data to calculate trend 791 3 2002 - 2004 27.9 - - - -

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Florida Keys National Marine Sanctuary Seagrass Monitoring Project - 296

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
276 Significantly increasing trend 123833 18 2002 - 2019 26.87 0.21 26.15 0.05 2e-04
287 Significantly increasing trend 133008 18 2002 - 2019 26.87 0.29 25.84 0.08 0
291 Significantly increasing trend 116240 18 2002 - 2019 26.38 0.26 25.72 0.09 0
305 Significantly increasing trend 122296 18 2002 - 2019 26.43 0.22 26.07 0.06 1e-04
307 Significantly increasing trend 110802 17 2002 - 2019 26.74 0.22 25.73 0.07 3e-04
SB Significantly increasing trend 145514 19 2001 - 2019 26.34 0.23 25.9 0.06 0
214 Significantly increasing trend 136333 18 2002 - 2019 26.52 0.27 25.84 0.07 0
225 Significantly increasing trend 117692 17 2002 - 2019 26.82 0.32 26.32 0.06 0
235 Significantly increasing trend 128499 18 2002 - 2019 27.14 0.28 25.77 0.08 0
237 Significantly increasing trend 122250 18 2002 - 2019 26.38 0.31 25.74 0.09 0
239 Significantly increasing trend 111523 17 2002 - 2018 26.92 0.24 25.96 0.07 1e-04
241 Significantly increasing trend 127914 18 2002 - 2019 27.26 0.27 25.91 0.09 0
243 Significantly increasing trend 121593 18 2002 - 2019 26.62 0.3 26 0.07 0
248 Significantly increasing trend 111702 18 2002 - 2019 26.79 0.31 25.54 0.08 0
255 Significantly increasing trend 119939 18 2002 - 2019 26.35 0.24 25.73 0.07 0
260 Significantly increasing trend 97832 16 2002 - 2019 27.07 0.28 26.22 0.08 0
267 Significantly increasing trend 99735 18 2002 - 2019 26.57 0.24 25.64 0.05 2e-04
269 Significantly increasing trend 106458 17 2002 - 2019 26.74 0.21 26.02 0.05 0.001
271 Significantly increasing trend 133627 18 2002 - 2019 26.92 0.26 25.77 0.07 0
273 Significantly increasing trend 129817 18 2002 - 2019 27.16 0.24 26.16 0.05 0
223 Significantly increasing trend 133082 18 2002 - 2019 26.89 0.3 25.84 0.08 0
227 Significantly increasing trend 105351 17 2003 - 2019 26.67 0.29 26.06 0.08 0
220 Significantly increasing trend 126033 17 2003 - 2019 26.52 0.25 25.94 0.06 0
215 Significantly increasing trend 133286 16 2003 - 2018 26.74 0.26 26.42 0.05 0
284 Significantly increasing trend 123977 17 2002 - 2019 26.86 0.28 25.14 0.09 0
285 Significantly increasing trend 121423 18 2002 - 2019 26.86 0.25 26.17 0.07 0
309 Significantly increasing trend 107410 18 2002 - 2019 27.85 0.27 26.07 0.06 0
216 Significantly increasing trend 98535 17 2002 - 2018 26.26 0.31 25.86 0.06 0
314 Significantly increasing trend 110686 18 2002 - 2019 27.41 0.23 25.63 0.06 2e-04
294 Significantly increasing trend 112348 18 2002 - 2019 26.92 0.27 25.52 0.09 0
296 Significantly increasing trend 114497 17 2002 - 2019 27.36 0.21 25.45 0.07 2e-04
500 Significantly increasing trend 69048 8 2012 - 2019 27.33 0.23 26.79 0.12 0.0074
506 No significant trend 35198 7 2012 - 2019 27.41 0.04 27.2 0.05 0.735
507 No significant trend 47517 8 2012 - 2019 27.36 0.18 27.48 0.09 0.1213
508 No significant trend 24021 6 2012 - 2019 26.67 0.33 26.54 0.07 0.2949
509 No significant trend 38607 8 2012 - 2019 27.70 0.05 27.79 0.11 0.4739
502 Insufficient data to calculate trend 22765 4 2016 - 2019 26.70 - - - -
501 No significant trend 34805 5 2012 - 2018 27.48 0.11 27.55 0.05 0.6481
503 Insufficient data to calculate trend 7490 1 2016 - 2016 28.74 - - - -
504 Insufficient data to calculate trend 4339 1 2018 - 2018 29.84 - - - -

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

USGS Coral Reef Ecosystem Studies (CREST) Project - 899

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
Sombrero Significantly increasing trend 459354 14 2009 - 2022 27.16 0.26 26.83 0.05 0
Molasses No significant trend 140713 5 2009 - 2013 26.72 -0.03 26.61 -0.04 0.9247
Crocker Significantly increasing trend 322670 10 2013 - 2022 27.32 0.15 27.07 0.03 0.0436

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature on Coral Reefs in the Florida Keys - 986

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
55 Significantly increasing trend 231874 23 2002 - 2024 26.94 0.33 26.69 0.06 0
15 Significantly increasing trend 218855 19 2006 - 2024 27.04 0.23 26.45 0.06 0
79 Significantly increasing trend 190275 18 2007 - 2024 26.94 0.33 26.51 0.07 0
40 Significantly increasing trend 259048 23 2002 - 2024 26.89 0.33 26.28 0.07 0
38 Significantly increasing trend 271179 23 2002 - 2024 26.59 0.35 25.96 0.07 0
73 Significantly increasing trend 193376 17 2008 - 2024 26.81 0.40 26.47 0.08 0
34 Significantly increasing trend 289051 23 2002 - 2024 26.84 0.36 25.94 0.07 0
56 Significantly increasing trend 190431 19 2006 - 2024 26.81 0.28 26.69 0.05 0
59 Significantly increasing trend 206603 20 2002 - 2024 26.96 0.37 26.63 0.07 0
36 Significantly increasing trend 207795 18 2007 - 2024 27.01 0.32 26.43 0.07 0
53 Significantly increasing trend 193391 17 2008 - 2024 27.06 0.42 26.53 0.08 0
57 Significantly increasing trend 202888 17 2008 - 2024 27.08 0.38 26.61 0.08 0
12 Significantly increasing trend 152036 15 2008 - 2024 27.18 0.26 26.41 0.07 0
35 Significantly increasing trend 232782 19 2006 - 2024 26.98 0.28 26.19 0.06 0
11 Significantly increasing trend 243135 20 2003 - 2024 26.84 0.34 26.13 0.07 0
14 Significantly increasing trend 238807 21 2002 - 2024 26.96 0.31 26.29 0.06 0
26 Significantly increasing trend 156891 16 2009 - 2024 27.08 0.31 26.74 0.08 0
52 Significantly increasing trend 202154 17 2008 - 2024 27.01 0.40 26.61 0.08 0
24 Significantly increasing trend 126389 13 2010 - 2024 27.08 0.40 26.16 0.10 0
77 Significantly increasing trend 203309 17 2008 - 2024 27.01 0.36 26.51 0.07 0
54 Significantly increasing trend 142926 13 2012 - 2024 27.09 0.31 26.64 0.06 0
78 Significantly increasing trend 102736 11 2014 - 2024 27.16 0.27 26.66 0.08 2e-04
22 Significantly increasing trend 185473 16 2009 - 2024 26.96 0.28 26.35 0.07 0
50 Significantly increasing trend 118231 12 2013 - 2024 27.11 0.33 26.82 0.07 0
72 Significantly increasing trend 198393 16 2008 - 2023 26.86 0.47 26.39 0.08 0
32 Significantly increasing trend 237317 20 2003 - 2024 26.74 0.36 26.04 0.07 0
80 Significantly increasing trend 182341 16 2009 - 2024 27.03 0.33 26.77 0.07 0
30 Significantly increasing trend 131074 13 2012 - 2024 26.67 0.26 26.23 0.06 1e-04
60 Significantly increasing trend 156278 16 2009 - 2024 27.01 0.23 26.99 0.05 3e-04
83 Significantly increasing trend 139311 17 2006 - 2023 25.86 0.19 25.79 0.05 4e-04
74 Significantly increasing trend 142860 13 2012 - 2024 26.94 0.31 26.52 0.06 0
76 Significantly increasing trend 183695 16 2009 - 2024 26.98 0.35 26.63 0.07 0
25 Significantly increasing trend 132181 14 2010 - 2024 27.28 0.21 26.73 0.07 0.0012
18 Significantly increasing trend 59983 9 2016 - 2024 27.18 0.20 26.21 0.08 0.031
51 Significantly increasing trend 237296 20 2003 - 2024 26.74 0.37 26.11 0.06 0
70 Significantly increasing trend 119048 12 2013 - 2024 27.01 0.33 26.73 0.06 0
61 Significantly increasing trend 68996 9 2016 - 2024 27.35 0.39 26.46 0.11 0
23 Significantly increasing trend 128184 13 2012 - 2024 27.43 0.27 26.73 0.08 0
75 Significantly increasing trend 159540 15 2010 - 2024 27.23 0.39 26.49 0.08 0
37 Significantly increasing trend 67333 9 2016 - 2024 27.03 0.30 26.27 0.12 0.0012
58 Significantly increasing trend 87137 11 2014 - 2024 27.35 0.25 26.94 0.07 0.0029
81 Significantly increasing trend 68931 9 2016 - 2024 27.35 0.39 26.48 0.11 0
39 No significant trend 48939 7 2018 - 2024 27.06 0.09 27.06 0.08 0.4478
21 Significantly increasing trend 69835 9 2016 - 2024 27.23 0.20 26.46 0.08 0.0257
33 No significant trend 50595 8 2016 - 2024 27.06 0.17 26.04 0.09 0.1793
10 No significant trend 32760 5 2020 - 2024 27.48 0.23 26.68 0.20 0.18

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Continuous Bottom Temperature Measurements along the Florida Reef Tract - 989

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
FKNMS-GRECIAN No significant trend 51723 18 1990 - 2010 26.65 -0.03 26.48 0 0.6634
FKNMS-KW-CHANL No significant trend 123578 18 1991 - 2012 26.27 0.1 26.11 0.02 0.0805
FKNMS-LONG-KEY No significant trend 69656 19 1990 - 2010 26.64 -0.03 26.35 -0.01 0.5769
FKNMS-7MILE-BR No significant trend 73055 19 1991 - 2010 26.66 0.05 26.22 0.01 0.3549
FKNMS-BULLARD Significantly increasing trend 66230 18 1992 - 2009 26.31 0.12 26.11 0.02 0.0313
FKNMS-SAND-KEY No significant trend 59287 18 1990 - 2010 26.70 0.05 26.46 0.01 0.323
FKNMS-BHONDA-BR No significant trend 77111 22 1990 - 2011 26.60 -0.02 26.67 0 0.6571
FKNMS-LOOE-ISELIN No significant trend 194367 13 1999 - 2014 26.88 0.13 26.55 0.03 0.0801
FKNMS-ALLIGATOR No significant trend 65144 19 1990 - 2010 26.55 -0.06 26.72 -0.01 0.2339
FKNMS-HEN-and-CHIX No significant trend 72285 21 1989 - 2011 26.50 -0.01 26.35 0 0.8763
FKNMS-9FT-SHOAL No significant trend 80299 21 1990 - 2010 26.50 0 26.76 0 0.9917
FKNMS-SMITH-SHL No significant trend 94527 10 1998 - 2012 25.45 0.13 25.99 0.02 0.1933
FKNMS-LOOE-BACK No significant trend 84984 18 1990 - 2012 26.80 -0.06 26.6 -0.01 0.4216
FKNMS-BOCA-GRND No significant trend 73434 17 1990 - 2012 26.14 0.08 26.04 0.01 0.1662
FKNMS-200YR-HD No significant trend 44601 12 1998 - 2009 26.10 -0.1 26.45 -0.04 0.172
FKNMS-CARYSFORT No significant trend 55001 16 1990 - 2006 26.40 -0.03 26.38 0 0.6354
FKNMS-SPRIGGER No significant trend 41834 13 1992 - 2006 26.10 0.02 25.78 0 0.8553
FKNMS-TENN-REEF No significant trend 63260 16 1990 - 2006 26.70 -0.06 26.22 -0.01 0.2738
FKNMS-SOMBRERO No significant trend 48974 13 1991 - 2005 26.50 0.13 26.14 0.03 0.0508
FKNMS-ELPIS No significant trend 31035 8 2004 - 2011 26.35 0.06 25.9 0.04 0.5313
FKNMS-LOOE-BUOY5 No significant trend 35252 10 1988 - 1998 26.90 0.05 26.86 0.02 0.3627
FKNMS-PILLAR No significant trend 40805 11 1996 - 2006 26.24 0.02 26.04 0.01 0.9363
FKNMS-WS-JACKYL No significant trend 29557 9 1991 - 1999 26.40 0.17 26.96 0.06 0.086
FKNMS-MOLASSES No significant trend 36146 13 1990 - 2002 26.70 -0.05 26.74 -0.01 0.4806
FKNMS-SNAKE-CRK No significant trend 56777 19 1989 - 2007 26.16 -0.06 26.33 -0.02 0.2771
FKNMS-CARD-SND No significant trend 18249 6 2001 - 2006 26.52 -0.05 27.32 -0.05 0.7909
FKNMS-NEWGROUND No significant trend 35329 12 1992 - 2006 25.49 -0.05 25.73 -0.01 0.5207
FKNMS-WELLWOOD No significant trend 30427 8 2002 - 2009 26.43 0 26.82 0 1
FKNMS-DIEGO-TER No significant trend 16693 5 2002 - 2006 25.58 -0.05 25.91 -0.03 0.8407
FKNMS-WS-BUOY16 Insufficient data to calculate trend 8123 3 2003 - 2005 25.99 - - - -
FKNMS-MAITLAND Insufficient data to calculate trend 12421 4 2004 - 2007 26.07 - - - -
FKNMS-W-SAMBO No significant trend 18786 6 1990 - 1995 26.90 0.09 26.16 0.03 0.5597
FKNMS-HARBORKEY No significant trend 15407 5 1992 - 1997 26.50 0.14 25.74 0.14 0.3261

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Florida Keys Aquatic Preserves Continuous Water Quality Monitoring - 10004

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
FKCB Insufficient data to calculate trend 16263 1 2024 - 2024 26.8 - - - -
FKLK Insufficient data to calculate trend 21517 1 2024 - 2024 29.0 - - - -

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for nine locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 Significantly decreasing trend 10078 30 1994 - 2025 8.04 -0.14463 8.06294 -0.00308 4e-04

Monthly average pH decreased by less than 0.01 pH units per year.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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
FKLK Insufficient data to calculate trend 21517 1 2024 - 2024 8.1 - - - -
FKCB Insufficient data to calculate trend 16263 1 2024 - 2024 8.2 - - - -

There was insufficient data to fit a model for two locations.

Map showing location of ph continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 No significant trend 8296 35 1991 - 2025 0.66 -0.02291 0.88731 -0.00172 0.531

Turbidity showed no detectable trend between 1991 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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
FKLK Insufficient data to calculate trend 21399 1 2024 - 2024 6 - - - -
FKCB Insufficient data to calculate trend 16240 1 2024 - 2024 4 - - - -

There was insufficient data to fit a model for two locations.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 537 18 2007 - 2024 12 -0.59838 50.05297 -4.69333 0

Monthly average total suspended solids decreased by 4.69 mg/L per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 No significant trend 21214 37 1989 - 2025 0.29775 0.0606 0.4178 0.00221 0.0904

Chlorophyll a, uncorrected for pheophytin, showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 2130 18 2004 - 2025 0.6495 0.24111 0.22352 0.03339 1e-04

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.03 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 No significant trend 5102 29 1996 - 2024 -2.13363 0.00171 -2.46264 0.00038 0.924

Secchi depth showed no detectable trend between 1996 and 2024.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. 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 1025 24 2001 - 2024 6 0.2457 5.43536 0.10476 3e-04

Monthly average colored dissolved organic matter increased by 0.1 PCU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. 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 Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.