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 No significant trend 3831 29 1992 - 2025 0.628 -0.06347 0.69909 -0.00167 0.1357

Total nitrogen showed no detectable trend between 1992 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 decreasing trend 3970 29 1992 - 2025 0.031 -0.08501 0.03538 -0.00013 0.0345

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

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq Significantly decreasing trend 654044 25 2002 - 2026 7.3 -0.11 7.57 -0.01 0.0098
apaebwq Significantly decreasing trend 698115 32 1995 - 2026 6.8 -0.27 7.55 -0.06 0
apaeswq Significantly decreasing trend 745989 32 1995 - 2026 6.8 -0.10 7.04 -0.02 0.0067
apalmwq Significantly decreasing trend 289063 11 2016 - 2026 6.3 -0.16 6.74 -0.05 0.0379
apapcwq No significant trend 302205 11 2016 - 2026 6.9 -0.03 6.98 -0.01 0.7925
apabpwq No significant trend 184169 7 2020 - 2026 6.5 0.14 6.37 0.08 0.1616
apacpwq Significantly increasing trend 650006 25 2002 - 2026 7.1 0.12 7.05 0.01 0.0037

At one program location, monthly average dissolved oxygen increased by 0.01 mg/L per year. At four program locations, monthly average dissolved oxygen decreased between 0.01 and 0.06 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 Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 82148 34 1992 - 2025 7.5 -0.08287 7.66871 -0.00885 0.0252

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 Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq No significant trend 658527 25 2002 - 2026 94.9 -0.05 97.62 -0.08 0.2718
apaebwq Significantly decreasing trend 694367 32 1995 - 2026 84.9 -0.23 91.03 -0.60 0
apaeswq No significant trend 746726 32 1995 - 2026 84.5 -0.06 85.63 -0.15 0.0976
apalmwq Significantly decreasing trend 289599 11 2016 - 2026 74.9 -0.16 76.47 -0.51 0.0379
apapcwq No significant trend 305661 11 2016 - 2026 94.0 0.04 92.74 0.11 0.5393
apabpwq Significantly increasing trend 184169 7 2020 - 2026 77.0 0.25 73.51 0.96 0.0176
apacpwq Significantly increasing trend 651534 25 2002 - 2026 94.3 0.18 91.75 0.22 0

At two program locations, monthly average dissolved oxygen saturation increased by 0.22% per year at one site and by 0.96% per year at the other. At two program locations, monthly average dissolved oxygen saturation decreased by 0.51% per year at one site and by 0.6% per year at the other. No detectable change in monthly average dissolved oxygen saturation was observed at three locations.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 No significant trend 5833 26 2000 - 2025 91.4 -0.09071 91.53316 -0.15814 0.0515

Dissolved oxygen saturation showed no detectable trend between 2000 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 96103 37 1964 - 2025 16.8 -0.16808 21.27605 -0.10819 0

Monthly average salinity decreased by 0.11 ppt per year.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq No significant trend 651798 25 2002 - 2026 22.3 0.00 21.84 -0.01 0.9332
apaebwq No significant trend 782974 32 1995 - 2026 10.0 0.04 9.24 0.02 0.3201
apaeswq No significant trend 792598 32 1995 - 2026 7.6 0.05 6.97 0.03 0.1789
apalmwq Significantly increasing trend 304777 11 2016 - 2026 0.1 0.24 0.08 0.01 0.0014
apapcwq No significant trend 303665 11 2016 - 2026 27.1 0.14 25.99 0.25 0.0655
apabpwq Significantly increasing trend 186721 7 2020 - 2026 0.1 0.34 0.06 0.01 0.001
apacpwq No significant trend 666150 25 2002 - 2026 22.5 0.01 21.69 0.01 0.8105

At two program locations, monthly average salinity increased by 0.01 ppt per year. No detectable change in monthly average salinity was observed at five locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

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 - Water Temperature
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
apadbwq Significantly increasing trend 679646 25 2002 - 2026 23.3 0.16 22.86 0.03 0.0002
apaebwq Significantly increasing trend 799283 32 1995 - 2026 24.1 0.16 23.05 0.02 0
apaeswq Significantly increasing trend 800593 32 1995 - 2026 24.1 0.20 22.88 0.04 0
apalmwq No significant trend 307034 11 2016 - 2026 22.7 0.01 23.35 0.00 0.9301
apapcwq No significant trend 308627 11 2016 - 2026 23.2 0.00 23.62 -0.01 0.9767
APCF1 Significantly increasing trend 1433809 21 2005 - 2025 23.4 0.12 22.93 0.04 0.0181
apabpwq Significantly increasing trend 186721 7 2020 - 2026 22.6 0.23 22.07 0.23 0.0446
apacpwq Significantly increasing trend 705144 25 2002 - 2026 23.5 0.16 23.01 0.03 0.0001

At six program locations, monthly average water temperature increased between 0.02 and 0.23°C per year. No detectable change in monthly average water temperature was observed at two locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 95140 37 1964 - 2025 23.4 0.12621 20.98404 0.02006 0.0005

Monthly average water temperature increased by 0.02°C per year.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq Significantly decreasing trend 636788 25 2002 - 2026 8.0 -0.11 8.06 0.00 0.0082
apaebwq Significantly decreasing trend 754923 32 1995 - 2026 7.6 -0.11 7.63 -0.01 0.0038
apaeswq Significantly decreasing trend 745836 32 1995 - 2026 7.5 -0.10 7.58 -0.01 0.0081
apalmwq No significant trend 297196 11 2016 - 2026 7.1 -0.06 7.13 0.00 0.5013
apapcwq Significantly decreasing trend 302765 11 2016 - 2026 8.1 -0.35 8.16 -0.02 0
apabpwq No significant trend 184904 7 2020 - 2026 7.1 0.09 7.04 0.01 0.3009
apacpwq No significant trend 649552 25 2002 - 2026 8.0 0.01 8.01 0.00 0.8559

At four program locations, monthly average pH decreased between less than 0.01 and 0.02 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 Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 67283 35 1964 - 2025 7.98 -0.34086 8.29946 -0.01016 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 Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq No significant trend 651297 25 2002 - 2026 35.35 -0.01 34.64 -0.01 0.8609
apaebwq No significant trend 783182 32 1995 - 2026 16.97 0.04 15.57 0.03 0.3201
apaeswq No significant trend 792928 32 1995 - 2026 13.14 0.05 12.34 0.04 0.2
apalmwq Significantly increasing trend 304777 11 2016 - 2026 0.15 0.24 0.12 0.02 0.0018
apapcwq No significant trend 303667 11 2016 - 2026 42.28 0.15 40.60 0.35 0.0574
apabpwq Significantly increasing trend 186713 7 2020 - 2026 0.12 0.27 0.10 0.01 0.0089
apacpwq No significant trend 666166 25 2002 - 2026 35.70 0.01 34.62 0.01 0.8673
Map showing location of specific conductivity continuous water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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
apadbwq No significant trend 638719 25 2002 - 2026 10 0.05 16.21 0.06 0.2341
apaebwq Significantly decreasing trend 672490 28 1997 - 2026 13 -0.18 19.33 -0.18 0
apaeswq Significantly decreasing trend 735494 31 1996 - 2026 9 -0.13 11.31 -0.09 0.001
apalmwq No significant trend 275282 11 2016 - 2026 11 0.08 11.53 0.23 0.3592
apapcwq No significant trend 292616 11 2016 - 2026 7 -0.11 10.95 -0.15 0.1473
apabpwq No significant trend 186715 7 2020 - 2026 11 -0.07 11.82 -0.20 0.4289
apacpwq No significant trend 663199 25 2002 - 2026 8 -0.02 12.90 -0.02 0.5896

At two program locations, monthly average turbidity decreased by 0.09 NTU per year at one site and by 0.18 NTU per year at the other. No detectable change in monthly average turbidity was observed at five locations.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 22996 32 1992 - 2025 5.1 0.27472 4.73754 0.17348 0

Monthly average turbidity increased by 0.17 NTU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 3480 29 1992 - 2025 10 -0.1794 14.90129 -0.1625 0

Monthly average total suspended solids decreased by 0.16 mg/L per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 3216 25 2000 - 2025 10 0.41262 1.12156 0.52381 0

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.52 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 3877 27 1999 - 2025 7.5 0.51683 -0.78714 0.43636 0

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.44 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 47598 31 1992 - 2025 -0.8 0.18371 -0.9859 0.00467 0

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

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. 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 No significant trend 157 11 2009 - 2025 25 0.08184 18.16667 1.0625 0.1916

Colored dissolved organic matter showed no detectable trend between 2009 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Apalachicola National Estuarine Research Reserve. 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 Apalachicola National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.