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 4344 29 1992 - 2025 0.63 -0.07171 0.70011 -0.00197 0.0911

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 4692 29 1992 - 2025 0.031 -0.09957 0.03517 -0.00016 0.014

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 - 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 83315 34 1992 - 2025 7.5 -0.06921 7.66498 -0.00794 0.0582

Dissolved oxygen 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.

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
apapcwq No significant trend 289558 10 2016 - 2025 6.8 -0.02 6.98 -0.01 0.8774
apaeswq Significantly decreasing trend 733356 31 1995 - 2025 6.8 -0.13 7.15 -0.02 6e-04
apalmwq Significantly decreasing trend 275414 10 2016 - 2025 6.3 -0.20 6.81 -0.05 0.0104
apadbwq Significantly decreasing trend 641801 24 2002 - 2025 7.2 -0.14 7.56 -0.02 0.0012
apacpwq Significantly increasing trend 636748 24 2002 - 2025 7.1 0.11 7.05 0.01 0.0064
apaebwq Significantly decreasing trend 685348 31 1995 - 2025 6.8 -0.30 7.58 -0.06 0
apabpwq No significant trend 170534 6 2020 - 2025 6.5 0.06 6.37 0.02 0.547

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 0.02 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 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 7037 26 2000 - 2025 91.5 -0.0551 90.47811 -0.08997 0.1842

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.

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
apabpwq No significant trend 170534 6 2020 - 2025 76.2 0.17 73.51 0.47 0.1238
apalmwq Significantly decreasing trend 275950 10 2016 - 2025 74.6 -0.21 77.22 -0.64 0.0073
apaebwq Significantly decreasing trend 681137 31 1995 - 2025 84.5 -0.26 91.05 -0.67 0
apacpwq Significantly increasing trend 638276 24 2002 - 2025 94.1 0.17 92.01 0.21 1e-04
apapcwq No significant trend 293014 10 2016 - 2025 93.9 0.03 93.21 0.10 0.6435
apaeswq Significantly decreasing trend 734556 31 1995 - 2025 84.2 -0.09 85.63 -0.21 0.0172
apadbwq No significant trend 645250 24 2002 - 2025 94.7 -0.08 97.86 -0.12 0.0663

At one program location, monthly average dissolved oxygen saturation increased by 0.21% per year. At three program locations, monthly average dissolved oxygen saturation decreased between 0.21 and 0.67% per year. 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.

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 96041 36 1964 - 2024 16.8 -0.18087 21.30476 -0.11606 0

Monthly average salinity decreased by 0.12 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
apalmwq Significantly increasing trend 291127 10 2016 - 2025 0.1 0.18 0.09 0.01 0.0204
apaeswq No significant trend 778085 31 1995 - 2025 7.3 0.04 6.97 0.02 0.2995
apapcwq No significant trend 291880 10 2016 - 2025 27.0 0.08 26.18 0.12 0.3086
apaebwq No significant trend 768387 31 1995 - 2025 9.7 0.03 9.21 0.02 0.4613
apacpwq No significant trend 652892 24 2002 - 2025 22.3 0.00 21.85 0.00 1
apadbwq No significant trend 640362 24 2002 - 2025 22.2 -0.03 22.03 -0.03 0.5212
apabpwq Significantly increasing trend 173086 6 2020 - 2025 0.1 0.26 0.09 0.00 0.0254

At two program locations, monthly average salinity increased by less than 0.01 ppt per year at one site and by 0.01 ppt per year at the other. 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 - 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 96337 37 1964 - 2025 23.4 0.12928 20.84681 0.02117 4e-04

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.

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
APCF1 Significantly increasing trend 1391382 21 2005 - 2025 23.3 0.12 22.98 0.04 0.0259
apaeswq Significantly increasing trend 787341 31 1995 - 2025 24.2 0.20 22.82 0.04 0
apapcwq No significant trend 295378 10 2016 - 2025 23.4 0.00 23.62 0.00 0.9754
apalmwq No significant trend 293385 10 2016 - 2025 22.9 0.00 23.35 0.00 1
apabpwq No significant trend 173086 6 2020 - 2025 22.8 0.20 22.24 0.24 0.0708
apadbwq Significantly increasing trend 666370 24 2002 - 2025 23.5 0.17 22.89 0.03 1e-04
apaebwq Significantly increasing trend 783431 31 1995 - 2025 24.3 0.16 23.03 0.02 0
apacpwq Significantly increasing trend 691886 24 2002 - 2025 23.6 0.17 23.05 0.03 1e-04

At five program locations, monthly average water temperature increased between 0.02 and 0.04°C per year. No detectable change in monthly average water temperature was observed at three 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.

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 67538 35 1964 - 2025 7.98 -0.32824 8.28421 -0.00992 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.

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
apaeswq Significantly decreasing trend 736038 31 1995 - 2025 7.5 -0.12 7.58 -0.01 0.0011
apadbwq Significantly decreasing trend 623515 24 2002 - 2025 8.0 -0.13 8.06 0.00 0.0031
apalmwq No significant trend 283547 10 2016 - 2025 7.1 -0.13 7.13 -0.01 0.1156
apapcwq Significantly decreasing trend 289516 10 2016 - 2025 8.1 -0.34 8.16 -0.02 0
apabpwq No significant trend 171276 6 2020 - 2025 7.1 -0.05 7.07 0.00 0.8409
apaebwq Significantly decreasing trend 738964 31 1995 - 2025 7.6 -0.12 7.66 -0.01 9e-04
apacpwq No significant trend 636294 24 2002 - 2025 8.0 -0.02 8.01 0.00 0.7052

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.

Water Clarity

Turbidity - Discrete

Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Turbidity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 22988 32 1992 - 2025 5.1 0.26871 4.9 0.16728 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.

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
apaeswq Significantly decreasing trend 721945 30 1996 - 2025 9 -0.13 11.29 -0.09 0.0012
apapcwq No significant trend 280348 10 2016 - 2025 7 -0.05 10.67 -0.08 0.5527
apalmwq No significant trend 261636 10 2016 - 2025 12 0.13 13.14 0.36 0.111
apaebwq Significantly decreasing trend 656935 27 1997 - 2025 13 -0.17 19.33 -0.18 0
apadbwq No significant trend 625446 24 2002 - 2025 10 0.06 16.00 0.07 0.2189
apacpwq No significant trend 649942 24 2002 - 2025 8 -0.02 12.90 -0.02 0.6917
apabpwq No significant trend 173080 6 2020 - 2025 11 0.05 11.31 0.11 0.7379

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.

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 4183 29 1992 - 2025 10 -0.17823 14.94787 -0.16667 0

Monthly average total suspended solids decreased by 0.17 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 4903 25 2000 - 2025 10 0.19774 6.22108 0.3189 1e-04

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.32 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 9193 27 1999 - 2025 7.7 0.34185 4.01379 0.32492 0

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.32 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 47555 31 1992 - 2025 -0.8 0.18625 -0.99433 0.00481 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 Significantly increasing trend 180 13 2007 - 2025 22 0.14586 9.63015 1.97995 0.0133

Monthly average colored dissolved organic matter increased by 1.98 PCU 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.