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 2023 32 1989 - 2025 0.38645 0.13153 0.37438 0.00375 0.0024

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

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 No significant trend 2407 32 1989 - 2025 0.04345 0.08052 0.04309 0.00014 0.0505

Total phosphorus showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Quality

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
rkbfbwq No significant trend 603909 23 2002 - 2026 5.4 -0.02 5.19 0.00 0.6197
rkbfuwq Significantly decreasing trend 636515 22 2002 - 2026 5.1 -0.29 5.26 -0.02 0
rkbmbwq Significantly decreasing trend 657119 24 2000 - 2026 4.4 -0.24 4.90 -0.02 0
rkbpbwq No significant trend 332812 11 2016 - 2026 4.9 -0.14 5.22 -0.02 0.0762

At two program locations, monthly average dissolved oxygen decreased by 0.02 mg/L per year. No detectable change in monthly average dissolved oxygen was observed at two locations.

Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

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 Significantly decreasing trend 10119 35 1989 - 2025 5.8 -0.07697 5.95376 -0.01145 0.0498

Monthly average dissolved oxygen decreased by 0.01 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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
rkbfbwq No significant trend 608215 23 2002 - 2026 79.0 0.04 78.81 0.04 0.4281
rkbfuwq Significantly decreasing trend 636774 22 2002 - 2026 72.6 -0.20 76.84 -0.17 0
rkbmbwq Significantly decreasing trend 663443 24 2000 - 2026 65.3 -0.21 73.13 -0.24 0
rkbpbwq No significant trend 336249 11 2016 - 2026 72.7 -0.13 77.96 -0.28 0.0762

At two program locations, monthly average dissolved oxygen saturation decreased by 0.17% per year at one site and by 0.24% per year at the other. No detectable change in monthly average dissolved oxygen saturation was observed at two locations.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 Insufficient data to calculate trend 112 7 2008 - 2025 78.1 - - - -

There was insufficient data to fit a model for dissolved oxygen saturation.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 No significant trend 11080 45 1956 - 2025 31.9 -0.00448 31.10154 -0.00346 0.931

Salinity showed no detectable trend between 1956 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Continuous

Rookery Bay National Estuarine Research Reserve System-Wide Monitoring Program - 354

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 for All Stations - Salinity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkbfbwq No significant trend 703182 25 2002 - 2026 29.9 0.04 30.80 0.03 0.3375
rkbfuwq No significant trend 717069 25 2002 - 2026 26.3 0.01 27.82 0.01 0.7856
rkbmbwq Significantly decreasing trend 736129 27 2000 - 2026 33.3 -0.10 34.78 -0.06 0.016
rkbpbwq No significant trend 333127 11 2016 - 2026 30.5 0.14 29.94 0.23 0.0606

At one program location, monthly average salinity increased by 0.31 ppt per year. At two program locations, monthly average salinity decreased by 0.06 ppt per year at one site and by 0.44 ppt per year at the other. No detectable change in monthly average salinity was observed at seven locations. There was insufficient data to fit a model for two locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. 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 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 for All Stations - Salinity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
255123081321300 Significantly decreasing trend 1809 8 2007 - 2017 32 -0.23 35.11 -0.44 0.0182
255138081321701 Significantly increasing trend 2986 10 2017 - 2026 32 0.17 29.33 0.31 0.0294
255432081303900 No significant trend 6468 20 2006 - 2026 22 -0.08 26.67 -0.1 0.1135
255443081314700 Insufficient data to calculate trend 1465 4 2007 - 2011 32 - - - -
255532081314300 Insufficient data to calculate trend 902 3 2009 - 2011 31 - - - -
255534081324000 No significant trend 6162 19 2007 - 2026 32 -0.04 33.56 -0.06 0.3647
255654081350200 No significant trend 6183 19 2007 - 2026 32 -0.04 33.07 -0.04 0.365
255732081363700 No significant trend 1434 5 2011 - 2015 34 0.25 32.15 0.52 0.0955

At one program location, monthly average salinity increased by 0.31 ppt per year. At two program locations, monthly average salinity decreased by 0.06 ppt per year at one site and by 0.44 ppt per year at the other. No detectable change in monthly average salinity was observed at seven locations. There was insufficient data to fit a model for two locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

Rookery Bay National Estuarine Research Reserve System-Wide Monitoring Program - 354

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
rkbfbwq Significantly increasing trend 719021 25 2002 - 2026 27.0 0.22 26.16 0.04 0
rkbfuwq Significantly increasing trend 727501 25 2002 - 2026 26.9 0.26 26.03 0.06 0
rkbmbwq Significantly increasing trend 762033 27 2000 - 2026 26.8 0.25 26.04 0.04 0
rkbpbwq No significant trend 337833 11 2016 - 2026 27.4 0.05 26.96 0.02 0.5544

At six program locations, monthly average water temperature increased between 0.03 and 0.06°C per year. No detectable change in monthly average water temperature was observed at four locations. There was insufficient data to fit a model for two locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. 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
255123081321300 No significant trend 1818 8 2007 - 2017 27.3 0.1 26.46 0.03 0.3843
255138081321701 No significant trend 3005 10 2017 - 2026 27.0 0.02 26.85 0.01 0.9199
255432081303900 Significantly increasing trend 6527 20 2006 - 2026 27.0 0.17 26.18 0.05 0.0005
255443081314700 Insufficient data to calculate trend 2011 4 2007 - 2011 29.3 - - - -
255532081314300 Insufficient data to calculate trend 906 3 2009 - 2011 29.3 - - - -
255534081324000 Significantly increasing trend 6225 19 2007 - 2026 26.6 0.14 25.55 0.03 0.0069
255654081350200 Significantly increasing trend 6222 19 2007 - 2026 26.7 0.11 26.33 0.03 0.0327
255732081363700 No significant trend 1435 5 2011 - 2015 28.4 0.24 27.3 0.23 0.1149

At six program locations, monthly average water temperature increased between 0.03 and 0.06°C per year. No detectable change in monthly average water temperature was observed at four locations. There was insufficient data to fit a model for two locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 No significant trend 10694 43 1956 - 2025 26.8 0.06277 26.24631 0.01134 0.0788

Water temperature showed no detectable trend between 1956 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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
rkbfbwq No significant trend 670684 25 2002 - 2026 7.8 0.05 7.83 0 0.2078
rkbfuwq No significant trend 689115 25 2002 - 2026 7.7 0.02 7.72 0 0.6096
rkbmbwq Significantly decreasing trend 727383 27 2000 - 2026 7.7 -0.10 7.70 0 0.0184
rkbpbwq No significant trend 328113 11 2016 - 2026 7.8 0.13 7.80 0 0.0762

At one program location, monthly average pH decreased by less than 0.01 pH units per year. No detectable change in monthly average pH was observed at three locations.

Map showing location of ph continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 Significantly decreasing trend 4301 36 1956 - 2025 7.9 -0.23696 8.18343 -0.00802 0

Monthly average pH decreased by 0.01 pH units per year.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Specific Conductivity - Continuous

Seasonal Kendall-Tau Results - Specific Conductivity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
255123081321300 No significant trend 1295 6 2010 - 2017 49.10 -0.20 53.63 -1.03 0.2034
255138081321701 Significantly increasing trend 2986 10 2017 - 2026 48.30 0.18 45.21 0.36 0.0248
255432081303900 No significant trend 5512 17 2010 - 2026 34.40 -0.03 31.28 -0.08 0.6149
255534081324000 No significant trend 5509 17 2010 - 2026 48.60 0.04 48.14 0.08 0.4303
255654081350200 No significant trend 5547 17 2010 - 2026 48.60 0.03 47.21 0.03 0.5649
rkbfbwq No significant trend 703174 25 2002 - 2026 46.07 0.04 47.30 0.05 0.3304
rkbfuwq No significant trend 717061 25 2002 - 2026 41.17 0.01 43.06 0.02 0.7747
rkbmbwq Significantly decreasing trend 736129 27 2000 - 2026 50.83 -0.09 52.37 -0.08 0.0197
rkbpbwq No significant trend 333114 11 2016 - 2026 47.03 0.13 46.12 0.31 0.068
Map showing location of specific conductivity continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of specific conductivity continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Clarity

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
rkbfbwq Significantly decreasing trend 682915 25 2002 - 2026 7 -0.40 11.30 -0.23 0
rkbfuwq Significantly decreasing trend 657778 25 2002 - 2026 6 -0.19 8.57 -0.08 0
rkbmbwq Significantly decreasing trend 714237 27 2000 - 2026 9 -0.24 12.56 -0.14 0
rkbpbwq Significantly decreasing trend 331299 11 2016 - 2026 9 -0.31 13.47 -0.37 0

At four program locations, monthly average turbidity decreased between 0.08 and 0.37 NTU per year.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

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 increasing trend 4677 31 1989 - 2025 4 0.15654 4.59643 0.07792 0.0005

Monthly average turbidity increased by 0.08 NTU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 No significant trend 484 17 1989 - 2025 10 -0.00639 11.43828 -0.00667 0.8532

Total suspended solids showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 2173 30 1994 - 2025 3.65666 0.27384 3.27391 0.07449 0

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.07 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 No significant trend 639 15 2002 - 2025 3.7 0.09136 2.95078 0.04302 0.1463

Chlorophyll a, corrected for pheophytin, showed no detectable trend between 2002 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands 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 Insufficient data to calculate trend 220 9 2001 - 2025 -0.9 - - - -

There was insufficient data to fit a model for Secchi depth.

Map showing location of discrete water quality sampling locations within the boundaries of Cape Romano-Ten Thousand Islands 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 Cape Romano-Ten Thousand Islands Aquatic Preserve. The bubble size on the maps above reflect the amount of data available at each sampling site.