baywide seagrass assessment tampa, fl 33619 · the 1988 - 2006 swfwmd seagrass polygon coverages....
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1. Objectives Determine new seagrass management areas to be used by the Tampa Bay Estuary Program (TBEP) and its partners for the re-evaluation of a Baywide Seagrass Management Plan. From these defined areas, determine the current and historic acreages of seagrass resources and describe any trends in abundance from the SWFWMD seagrass coverage layers (1982 – 2006). In addition, assess whether each defined management area is currently meeting existing TBEP bay segment water quality targets.
2. Data Sources 2.1 GIS Resources
Management areas were operationally defined by the Tampa Bay Seagrass Working group and then delineated as a GIS polygon shapefile using ArcGIS 9.2 software. Coverages of seagrass resources were obtained from the SWFWMD for the years 1988, 1990, 1992, 1994, 1996, 1999, 2001, 2004, and 2006 (SWFWMD 2007). Historic, baseline coverage of seagrasses were obtained from the TBEP for the year 1950 (TBEP 1986).
2.2 Water Quality Data Routine water quality monitoring data collected by the Environmental Protection Commission of Hillsborough County from stations that strictly occurred in Tampa Bay and adjacent to the defined seagrass management areas over the 1974 – 2006 time period were used in the water quality target attainment assessment (EPCHC 2006).
3. Analysis 3.1 Management Area Delineation
Initial drafts delineated 30 management areas throughout Tampa Bay to the 12’ contour to ensure all historic, current, and future seagrass resources would fall within a given management area. The final delineated management areas were truncated closer to the shoreline as per the recommendations of the Tampa Bay Seagrass Working Group. This final management area delineation was used in subsequent analyses to subset the historic 1950 TBEP seagrass coverage and the 1988 - 2006 SWFWMD seagrass polygon coverages.
3.2 Management Area Seagrass Status and Trends To compare changes from historic, baseline conditions, seagrass acreages were subset from the 1950 TBEP coverage (minus any areas that intersected current land areas) and the 2006 SWFWMD total seagrass coverage (both patchy and continuous attributes combined) along the defined management areas. The percent change in total seagrass acreage in each management area was determined from the subset datasets. To compare recent seagrass status and trends, seagrass acreages from the 1988 – 2006 SWFWMD seagrass coverages were subset and summed for patchy (FLUCCSCODE=9113), continuous ((FLUCCSCODE=9116), and total
seagrass coverage (both patchy and continuous attributes combined) in the defined management areas using ArcGIS’s intersect tool. For each management area and coverage class (i.e., patchy, continuous, total), a non-parametric, Kendall Tau trend test was performed to assess whether decreasing or increasing trends in seagrass acreage over the 1988 – 2006 period were apparent. Due to the relatively small dataset (n ≤ 9) for each management area, any trend statistics with a p-value < 0.1 were considered significant.
3.3 Management Area Water Quality Target Attainment Attainment of existing, bay segment specific water quality targets [i.e., annual average chlorophyll-a concentrations (μg/L) and light attenuation (m-1, calculated from secchi depth)] was assessed from a subset of EPC fixed, bay-wide monitoring stations according to the methods outlined in JEI (2000). Stations were selected based upon their proximity to the defined management areas, and annual average chlorophyll-a and light attenuation was assessed according to the decision matrix developed by JEI (2000) for the TBEP over the period of record for each management area subset. Water quality targets for each management area were selected based upon the location of the management area in a specific major bay segment (i.e. Old Tampa Bay, Hillsborough Bay, Middle Tampa Bay, and Lower Tampa Bay).
4. Results 4.1 Management Areas
Thirty distinct seagrass management areas were delineated throughout the extent of Tampa Bay (Figure 1). Management areas 1 – 5 and 29 occur in the Hillsborough Bay segment. Management areas 19 (partially), 20 – 26, and 28 occur in the Old Tampa Bay segment. Management areas 6 – 7, 17 – 18, 19 (partially), 27, and 30 occur in the Middle Tampa Bay segment. Management areas 8 (partially), 10 – 11, and 16 (partially) occur in the Lower Tampa Bay segment. Management areas 12 – 15 and 16 (partially) occur in the Boca Ciega Bay segment. Management area 8 (partially) occurs in the Terra Ceia Bay segment. Management area 9 encompasses the Manatee River segment.
4.2 Management Area Seagrass Status and Trends Increases in current seagrass coverage (2006) over baseline levels defined by the 1950 TBEP restorable seagrass acreage coverage were observed in management areas 8 – 9, 11 – 12, 14, 16, 23, and 29 (Table 1; Figure 2). Decreases of 25% or less were observed in management areas 7, 10, 13, and 15. Decreases of 25 – 50% were observed in management areas 17, 19, 22, and 24 – 27. Decreases of 50 – 75% were observed in management areas 1, 5, 18, and 20 – 21. Decreases of 75% or more were observed in management areas 2 – 4, 6, and 28. Recent (1988 – 2006) spatial distribution of total seagrass coverage in the 30 management areas is depicted in Figure 3. The majority of seagrass acreage occurs within the management areas in and adjacent to Lower Tampa Bay.
Decreasing trends in recent seagrass coverage were observed in management areas 6, 17, and 20 for patchy seagrass acreage (Table 2, Figure 4); management area 6 for continuous seagrass acreage (Table 2; Figure 5); and management areas 6, 18, and 25 for total seagrass acreage (Table 2; Figure 6). All other areas showed stable or increasing trends in either patchy, continuous, or total seagrass acreage (Table 2, Figures 4 – 6). A summary of the individual trend analyses are depicted in Table 2 and graphical presentation of seagrass acreages for the recent 1988 – 2006 period are depicted in Figures 7 – 35.
4.3 Management Area Water Quality Target Attainment Summary of the EPC stations and bay segment specific water quality targets used to assess historical attainment of water quality targets are depicted in Table 3. Period of record results of attainment of the water quality targets for each management area according to decision matrix outcomes are depicted in Table 4 and graphical presentation of average annual chlorophyll-a and light attenuation with respect to the targets used are presented in Appendix 1. The spatial distribution of the most recent decision matrix results is presented in Figure 36. Historically, management areas 8, 12, 16, and 21 – 23 were never below both chlorophyll-a and light attenuation bay segment specific targets concurrently in the same year in order to achieve a “green” status in the decision matrix. These areas may warrant the development of more site specific water quality targets in the future. Recent 2006 results indicate that the majority of management areas are currently meeting both bay segment specific water quality targets (as indicated by “green” status); however, areas 8, 16, 21, and 23 – 24 show intermediate conditions that may warrant management actions, and areas 12 and 22 show problematic conditions that may warrant immediate management response. The most recent decision matrix results should be considered preliminary and recommendations of management response are contingent on the acceptability of using the existing bay segment specific water quality targets on the 30, newly proposed seagrass management areas.
References Environmental Protection Commission of Hillsborough County (EPCHC). 2006.
Routine water quality monitoring database: 1974 – 2006. http://www.epchc.org/ERM%20Data/EPCHC_AWQM_1974_2006.xls .
Southwest Florida Water Management District (SWFWMD). 2007. Recent
seagrass coverages in the SWFWMD. http://www.swfwmd.state.fl.us/data/gis/layer_library/category/swim .
Tampa Bay Estuary Program (TBEP). 1986. Historical seagrass coverage for
Tampa Bay in 1950. http://www.tbeptech.org/GISShapefiles/Seagrasses/metadata_html/sg50_metadata.htm .
Table 1: Relative percent change and total acreage change in current seagrass acreage (2006 SWFWMD seagrass coverage estimates) from historic, baseline conditions (1950 TBEP restorable seagrass coverage estimates) in the TBEP seagrass management areas.
TBEP Seagrass
Management Area
2006 Total Seagrass Acreage
1950 Restorable Seagrass Acreage
Acreage Change
% Change
1 41.331 150.625 -109.294 -72.6% 2 3.204 50.693 -47.488 -93.7% 3 11.114 557.915 -546.801 -98.0% 4 29.979 316.364 -286.386 -90.5% 5 325.663 928.011 -602.348 -64.9% 6 333.879 2592.507 -2258.628 -87.1% 7 2094.546 2266.979 -172.433 -7.6% 8 4119.592 3508.683 610.908 17.4% 9 690.030 88.160 601.870 682.7%
10 2381.871 2495.726 -113.855 -4.6% 11 102.883 8.662 94.221 1087.7% 12 6715.784 6440.634 275.150 4.3% 13 949.223 1171.159 -221.937 -19.0% 14 709.600 418.652 290.948 69.5% 15 458.838 592.453 -133.615 -22.6% 16 1221.653 513.294 708.359 138.0% 17 837.972 1156.868 -318.896 -27.6% 18 403.126 890.958 -487.832 -54.8% 19 1091.656 2151.567 -1059.911 -49.3% 20 626.660 1344.569 -717.909 -53.4% 21 641.905 1788.884 -1146.980 -64.1% 22 332.242 636.398 -304.156 -47.8% 23 776.595 521.923 254.673 48.8% 24 1108.021 2065.101 -957.080 -46.3% 25 805.635 1482.594 -676.959 -45.7% 26 296.087 404.065 -107.979 -26.7% 27 1171.185 1568.009 -396.824 -25.3% 28 53.976 410.969 -356.993 -86.9% 29 0.575 0.000 0.575 - 30 0.000 0.000 0.000 -
Table 2: Patchy, continuous, and total seagrass acreages in the 30 management areas and the results of a Kendall Tau trend test on the recent acreage estimates. Significant increasing (green shading) and decreasing (red shading) trends and non-significant trends (blue shading) are depicted.
SWFWMD Acreage Estimates TBEP Manage-
ment Area
Coverage Class
1988 1990 1992 1994 1996 1999 2001 2004 2006
Kendall Tau
Statistic
P-VALUE
Patchy 5.27 5.27 41.06 1 0.1172 Continuous 0.09 0.09 0.27 1 0.1172 1
TOTAL 0.09 0.09 5.27 5.27 41.33 1 0.0143
Patchy 0.21 0.93 5.55 5.56 3.12 59.46 9.18 3.20 0.5 0.0833 Continuous 6.59 24.23 1 . 2
TOTAL 0.21 0.93 5.55 5.56 9.71 83.69 9.18 3.20 0.5 0.0833
Patchy 26.09 40.32 28.37 26.77 30.48 11.11 -0.2 0.573 Continuous 35.47 1.15 -1 . 3
TOTAL 26.09 40.32 63.84 27.93 30.48 11.11 -0.2 0.573
Patchy 1.18 6.87 9.98 32.55 38.33 23.81 186.34 270.98 16.64 0.61 0.0218 Continuous 29.64 49.66 13.33 -0.33 0.6015 4
TOTAL 1.18 6.87 9.98 32.55 38.33 23.81 215.98 320.64 29.98 0.67 0.0123
Patchy 1.24 33.24 24.36 72.17 94.74 86.78 30.43 122.43 158.23 0.67 0.0123 Continuous 1.39 1.37 1.04 1.04 13.73 69.70 51.47 167.43 0.57 0.0478 5
TOTAL 2.63 34.61 25.40 73.21 108.47 86.78 100.13 173.91 325.66 0.83 0.0018
Patchy 755.15 548.60 525.68 636.03 474.39 429.97 456.98 178.57 185.17 -0.78 0.0035 Continuous 389.08 490.44 286.84 224.03 177.17 149.79 326.23 211.99 148.71 -0.61 0.0218 6
TOTAL 1144.23 1039.04 812.52 860.06 651.56 579.76 783.21 390.56 333.88 -0.83 0.0018
Patchy 846.57 780.70 796.00 1070.68 1271.23 1112.49 942.16 1561.51 1080.24 0.5 0.0606 Continuous 854.69 997.82 989.74 937.84 750.97 937.15 1026.45 1012.75 1014.31 0.33 0.2109 7
TOTAL 1701.26 1778.53 1785.75 2008.52 2022.20 2049.64 1968.61 2574.26 2094.55 0.78 0.0035
Patchy 1404.99 1632.07 1602.79 1702.23 1907.00 1490.33 1118.74 2026.20 1727.79 0.28 0.2971 Continuous 2489.95 2586.60 2706.87 2626.22 2215.23 2270.53 2517.20 2200.09 2391.80 -0.33 0.2109 8
TOTAL 3894.94 4218.67 4309.66 4328.45 4122.23 3760.87 3635.94 4226.29 4119.59 -0.17 0.5316
Patchy 90.19 95.46 94.89 104.08 118.36 139.56 121.61 253.13 486.36 0.89 0.0008 Continuous 166.58 177.06 177.63 170.85 157.13 138.53 161.79 100.30 203.67 -0.22 0.4042 9
TOTAL 256.77 272.52 272.52 274.93 275.49 278.09 283.40 353.43 690.03 0.94 0.0004
Patchy 512.90 582.99 884.68 1091.66 1339.21 767.82 377.49 478.01 626.81 -0.06 0.8348 Continuous 1345.31 1434.08 1136.97 940.96 878.27 1423.13 1717.90 1616.16 1755.06 0.39 0.1444 10
TOTAL 1858.22 2017.08 2021.64 2032.62 2217.48 2190.95 2095.39 2094.17 2381.87 0.67 0.0123
Patchy 2.52 14.07 13.72 15.34 28.92 7.65 7.65 58.85 67.15 0.44 0.0953 Continuous 29.32 29.71 30.51 28.88 29.32 35.32 34.99 34.49 35.74 0.56 0.0371 11
TOTAL 31.84 43.78 44.22 44.22 58.24 42.97 42.64 93.34 102.88 0.5 0.0606
Table 2 (cont’d): SWFWMD Acreage Estimates TBEP
Manage-ment Area
Coverage Class 1988 1990 1992 1994 1996 1999 2001 2004 2006
Kendall Tau
Statistic P-
VALUE
Patchy 562.63 886.25 861.75 1087.01 1310.26 858.47 525.18 571.60 755.89 -0.17 0.5316 Continuous 5189.40 5253.47 5286.62 5020.45 5056.72 5372.20 5751.00 5728.19 5959.89 0.61 0.0218 12
TOTAL 5752.03 6139.72 6148.37 6107.46 6366.98 6230.67 6276.17 6299.79 6715.78 0.72 0.0067
Patchy 123.48 142.41 152.63 221.24 252.50 173.12 104.47 233.64 320.39 0.5 0.0606 Continuous 216.20 265.94 280.58 269.50 314.59 326.36 523.75 358.77 628.83 0.89 0.0008 13
TOTAL 339.67 408.35 433.21 490.75 567.09 499.48 628.22 592.41 949.22 0.89 0.0008
Patchy 42.65 67.20 95.67 191.55 194.31 96.80 22.20 130.46 277.31 0.44 0.0953 Continuous 73.43 102.20 117.71 122.26 178.66 250.95 345.26 270.71 432.29 0.94 0.0004 14
TOTAL 116.08 169.40 213.38 313.81 372.97 347.74 367.46 401.17 709.60 0.89 0.0008
Patchy 1.34 2.40 68.58 127.07 210.39 103.48 26.49 125.40 224.13 0.56 0.0371 Continuous 0.32 0.55 4.01 14.37 74.45 167.13 255.46 188.29 234.71 0.89 0.0008 15
TOTAL 1.66 2.95 72.59 141.44 284.84 270.61 281.95 313.68 458.84 0.89 0.0008
Patchy 286.21 455.04 440.66 438.37 613.56 394.68 282.15 321.88 306.15 -0.33 0.2109 Continuous 525.75 585.27 601.37 523.66 567.41 609.66 719.67 812.13 915.50 0.72 0.0067 16
TOTAL 811.96 1040.31 1042.03 962.03 1180.97 1004.33 1001.82 1134.01 1221.65 0.44 0.0953
Patchy 384.23 357.89 299.87 361.24 394.60 288.70 169.31 270.96 98.96 -0.61 0.0218 Continuous 417.32 474.11 535.91 507.84 534.81 630.01 741.62 682.15 739.01 0.78 0.0035 17
TOTAL 801.56 831.99 835.78 869.08 929.41 918.70 910.94 953.11 837.97 0.56 0.0371
Patchy 232.90 210.43 165.43 279.67 369.50 447.36 216.07 232.04 89.96 -0.06 0.8348 Continuous 318.56 349.39 404.65 276.44 235.09 89.24 277.65 297.83 313.16 -0.17 0.5316 18
TOTAL 551.46 559.81 570.07 556.11 604.59 536.60 493.71 529.88 403.13 -0.5 0.0606
Patchy 664.00 618.13 625.18 848.70 1042.61 666.44 425.60 555.49 549.03 -0.28 0.2971 Continuous 667.95 751.95 835.74 617.02 535.09 601.27 760.75 728.20 542.62 -0.22 0.4042 19
TOTAL 1331.95 1370.08 1460.92 1465.72 1577.70 1267.71 1186.35 1283.70 1091.66 -0.33 0.2109
Patchy 484.36 445.89 349.98 440.52 687.95 480.46 245.08 259.45 200.07 -0.5 0.0606 Continuous 274.52 453.10 555.12 501.38 490.16 103.68 420.31 369.96 426.59 -0.17 0.5316 20
TOTAL 758.88 898.99 905.11 941.91 1178.11 584.14 665.39 629.41 626.66 -0.28 0.2971
Patchy 322.28 362.48 250.73 197.34 164.61 93.49 597.94 470.29 635.20 0.17 0.5316 Continuous 58.76 172.06 162.27 162.44 95.49 116.21 136.99 0.62 6.71 -0.39 0.1444 21
TOTAL 381.04 534.55 413.00 359.78 260.10 209.69 734.93 470.91 641.90 0.11 0.6767
Patchy 120.05 32.70 31.66 129.55 273.01 227.60 226.54 555.82 331.62 0.61 0.0218 Continuous 31.64 29.86 29.86 46.75 33.30 185.02 0.62 0.05 0.8806 22
TOTAL 151.69 62.56 61.52 176.30 306.31 227.60 411.55 555.82 332.24 0.67 0.0123
Patchy 311.63 351.51 523.10 515.48 449.63 413.20 176.25 273.15 462.77 -0.11 0.6767 Continuous 246.06 277.13 252.01 260.00 273.34 191.87 470.23 27.85 313.83 0.11 0.6767 23
TOTAL 557.68 628.64 775.11 775.48 722.97 605.07 646.48 300.99 776.60 0.11 0.6767
Table 2 (cont’d): SWFWMD Acreage Estimates TBEP
Manage-ment Area
Coverage Class 1988 1990 1992 1994 1996 1999 2001 2004 2006
Kendall Tau
Statistic P-
VALUE
Patchy 464.63 552.30 784.11 746.08 647.81 392.46 416.95 378.29 420.20 -0.39 0.1444 Continuous 561.23 697.92 658.88 603.30 282.93 483.36 496.44 309.41 687.82 -0.22 0.4042 24
TOTAL 1025.86 1250.22 1442.99 1349.38 930.73 875.81 913.39 687.70 1108.02 -0.39 0.1444
Patchy 576.83 541.54 546.51 587.42 716.83 670.49 599.18 420.12 378.60 -0.11 0.6767 Continuous 405.03 462.06 514.78 459.34 328.07 141.50 210.03 316.86 427.03 -0.33 0.2109 25
TOTAL 981.86 1003.60 1061.29 1046.76 1044.90 811.99 809.20 736.98 805.63 -0.56 0.0371
Patchy 151.31 139.64 120.44 173.72 201.87 253.68 156.57 125.46 111.46 -0.11 0.6767 Continuous 130.98 142.51 179.76 142.25 128.14 44.44 121.41 197.37 184.63 0.06 0.8348 26
TOTAL 282.29 282.14 300.20 315.97 330.00 298.12 277.98 322.83 296.09 0.11 0.6767
Patchy 282.00 284.51 325.87 637.47 600.88 511.27 592.02 969.41 408.75 0.44 0.0953 Continuous 189.10 322.89 377.46 298.28 153.23 532.12 565.39 501.54 762.43 0.56 0.0371 27
TOTAL 471.10 607.41 703.33 935.75 754.10 1043.39 1157.41 1470.95 1171.19 0.89 0.0008
Patchy 24.56 42.87 34.50 43.02 55.05 27.19 17.65 23.64 16.90 -0.39 0.1444 Continuous 12.96 10.16 17.24 15.00 2.49 1.81 11.35 15.97 37.07 0.17 0.5316 28
TOTAL 37.52 53.02 51.74 58.02 57.54 29.00 29.00 39.61 53.98 -0.06 0.8348
Patchy 0.75 15.49 14.42 0.58 -0.33 0.4969 Continuous 6.08 7.16 1 . 29
TOTAL 0.75 21.58 21.57 0.58 -0.33 0.4969
Patchy Continuous 30
TOTAL No mapped seagrasses within management area extent No Data
Table 3: Summary of Environmental Protection Commission of Hillsborough County (EPC) routine water quality monitoring stations and Tampa Bay Estuary Program (TBEP) bay segment specific water quality targets used to assess attainment of targets in each management area.
Chlorophyll-a Target Light Attenuation Target TBEP
Seagrass Management
Area
EPC Station(s) Used
TBEP Bay Segment Target Applied Target
(μg/L)
Small Magnitude Difference
(μg/L)
Large Magnitude Difference
(μg/L)
Target (m-1)
Small Magnitude Difference
(m-1)
Large Magnitude Difference
(m-1)
1 58 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 2 6, 44, 70 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 3 8, 52, 55, 71 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 4 6, 7 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 5 73, 80 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 6 9, 80, 81, 84 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91 7 16, 19, 21 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91 8 22, 24, 90 Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 9 NA Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68
10 NA Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 11 93 Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 12 96 Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 13 NA Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 14 NA Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 15 NA Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 16 25 Lower Tampa Bay 4.6 4.8 5.1 0.63 0.66 0.68 17 28 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91 18 32 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91 19 68 Average MTB & OTB 7.95 8.4 8.9 0.83 0.865 0.895 20 38, 67 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 21 42, 62 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 22 65 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 23 46, 64 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 24 47, 60, 61, 62 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 25 40, 41, 50, 51, 63 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 26 36, 51 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 27 11, 13, 32, 33 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91 28 38, 67 Old Tampa Bay 8.5 8.9 9.3 0.83 0.86 0.88 29 52, 55, 80 Hillsborough Bay 13.2 14.1 15 1.58 1.63 1.67 30 28, 82 Middle Tampa Bay 7.4 7.9 8.5 0.83 0.87 0.91
Table 4: Summary of historic Tampa Bay Estuary Program decision matrix results for each seagrass management area.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 301974 Yellow Yellow Yellow Red Green Yellow Green Red Yellow Yellow Red Red Red Yellow Green Green Yellow Yellow1975 Red Red Red Red Green Green Red Red Yellow Red Red Red Red Red Red Red Yellow Red Red1976 Red Red Red Red Yellow Red Green Yellow Yellow Red Red Green Red Red Red Red Red Red Red Red Red Red Red Green1977 Red Red Red Red Red Red Yellow Red Yellow Red Red Yellow Yellow Red Red Red Red Red Red Yellow Yellow Red Red Red Green1978 Red Red Red Red Red Red Yellow Red Yellow Red Red Yellow Red Red Red Red Red Yellow Red Red Red Red Red Red Yellow1979 Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red1980 Red Red Red Red Yellow Red Yellow Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red Red1981 Red Red Red Red Red Red Yellow Red Red Red Red Red Yellow Red Red Red Red Red Red Red Yellow Red Red Red Red1982 Red Red Red Red Yellow Red Yellow Red Red Red Red Yellow Red Red Red Red Red Red Red Red Red Red Red Red Yellow1983 Red Yellow Yellow Yellow Yellow Red Yellow Red Red Red Red Yellow Red Red Red Red Red Red Red Red Red Red Red Yellow Yellow1984 Yellow Green Yellow Green Green Red Green Yellow Yellow Red Red Green Red Red Red Red Red Red Red Red Red Red Red Yellow Green1985 Red Yellow Red Red Yellow Red Green Yellow Green Red Red Green Yellow Yellow Red Red Red Red Red Red Yellow Red Red Yellow Green1986 Red Yellow Yellow Yellow Yellow Red Green Yellow Green Red Red Green Yellow Yellow Red Red Red Red Red Yellow Yellow Yellow Red Yellow Green1987 Yellow Green Yellow Green Yellow Red Green Yellow Green Red Red Green Yellow Yellow Yellow Red Red Red Red Yellow Yellow Yellow Yellow Yellow Green1988 Yellow Green Yellow Green Green Red Green Yellow Green Yellow Red Green Yellow Green Yellow Red Red Red Red Green Green Yellow Yellow Green Green1989 Yellow Green Yellow Green Green Red Green Red Green Red Red Yellow Yellow Yellow Yellow Red Red Red Red Yellow Green Yellow Yellow Yellow Green1990 Yellow Green Yellow Yellow Green Red Green Yellow Green Red Red Green Yellow Yellow Red Red Red Red Red Green Green Yellow Red Green Green1991 Yellow Yellow Yellow Yellow Green Red Green Yellow Green Yellow Red Green Yellow Green Green Red Red Red Red Green Green Yellow Green Green Green1992 Yellow Green Green Green Green Red Green Yellow Yellow Red Red Green Green Green Yellow Red Red Yellow Yellow Green Green Green Yellow Green Green1993 Yellow Green Green Green Green Yellow Green Yellow Yellow Red Red Green Green Yellow Yellow Red Red Yellow Yellow Yellow Green Green Yellow Green Green1994 Yellow Yellow Yellow Yellow Yellow Yellow Green Red Green Red Red Yellow Yellow Yellow Yellow Red Red Red Red Yellow Yellow Yellow Yellow Yellow Yellow1995 Yellow Yellow Yellow Yellow Yellow Red Green Yellow Yellow Red Red Yellow Yellow Yellow Red Red Red Red Red Yellow Yellow Yellow Red Yellow Green1996 Yellow Green Green Green Green Yellow Green Yellow Green Yellow Yellow Green Green Yellow Yellow Red Red Yellow Red Green Green Green Yellow Green Green1997 Green Yellow Green Green Green Red Green Red Green Red Red Green Yellow Yellow Yellow Red Red Red Red Green Green Yellow Yellow Green Green1998 Red Red Red Yellow Yellow Red Green Red Yellow Red Red Yellow Red Red Red Red Red Red Red Yellow Red Red Red Yellow Red1999 Green Green Green Green Green Yellow Green Red Green Red Red Green Yellow Yellow Red Red Red Yellow Yellow Green Yellow Yellow Red Green Green2000 Green Green Green Green Green Yellow Green Red Yellow Red Red Yellow Green Green Yellow Red Red Red Green Green Green Green Yellow Green Green2001 Green Green Green Green Green Red Green Red Yellow Red Red Green Yellow Yellow Yellow Red Red Red Red Yellow Yellow Yellow Yellow Green Green2002 Yellow Yellow Yellow Green Green Green Green Yellow Green Red Red Green Green Green Yellow Red Red Red Red Green Green Green Yellow Green Green2003 Green Green Yellow Yellow Green Yellow Green Yellow Green Yellow Red Green Green Yellow Red Red Red Red Red Red Yellow Yellow Red Green Green2004 Green Green Yellow Green Green Yellow Green Red Green Red Red Green Green Yellow Red Red Red Red Red Yellow Green Green Red Green Green2005 Yellow Yellow Green Green Green Yellow Green Red Yellow Red Yellow Green Yellow Green Yellow Red Red Red Red Green Green Yellow Yellow Green Green2006 Yellow Green Green Green Green Green Green Yellow Green Red Yellow Green Green Green Green Yellow Red Yellow Yellow Green Green Green Green Green Green
Tampa Bay Estuary Program Seagrass Management AreaYEAR
No Data
No Data
No Data
No Data
No Data
Figure 1: Final delineated Tampa Bay Estuary Program seagrass management areas.
Figure 2: Spatial distribution of the relative percent change and total acreage change (inset graph) in
current seagrass acreage (2006 SWFWMD seagrass coverage estimates) from historic, baseline conditions (1950 TBEP restorable seagrass coverage estimates) in the TBEP seagrass management areas.
Figure 3: Spatial and temporal distribution of total seagrass acreages, as estimated from SWFWMD
seagrass coverages from 1988 – 2006, in the 30 TBEP seagrass management areas.
Figure 4: Spatial distribution of patchy seagrass coverage trends as determined from SWFWMD acreage
estimates in the 30 TBEP seagrass management areas over the recent 1988 – 2006 time period.
Figure 5: Spatial distribution of continuous seagrass coverage trends as determined from SWFWMD
acreage estimates in the 30 TBEP seagrass management areas over the recent 1988 – 2006 time period.
Figure 6: Spatial distribution of total seagrass coverage trends as determined from SWFWMD acreage
estimates in the 30 TBEP seagrass management areas over the recent 1988 – 2006 time period.
0
10
20
30
40
50
60
70
80
90
100
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0143)
Inset
Figure 7: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 1.
0
10
20
30
40
50
60
70
80
90
100
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Increasing Trend (p=0.0833)Continuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0833)
Inset
Figure 8: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 2.
0
10
20
30
40
50
60
70
80
90
100
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 9: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 3.
0
50
100
150
200
250
300
350
400
450
500
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Increasing Trends (p=0.0218)Continuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0123)
Inset
Figure 10: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 4.
0
50
100
150
200
250
300
350
400
450
500
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0123)Continuous Seagrasses - Increasing Trend (p=0.0478)Total Seagrasses - Increasing Trend (p=0.0018)
Inset
Figure 11: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 5.
0
200
400
600
800
1000
1200
1400
1600
1800
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Decreasing Trend (p=0.0035)Continuous Seagrasses - Decreasing Trend (p=0.0218)Total Seagrasses - Decreasing Trend (p=0.0018)
Inset
Figure 12: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 6.
0
500
1000
1500
2000
2500
3000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0606)Continuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0035)
Inset
Figure 13: Estimated patchy, continuous, and total seagrass acreages and results of trend analysis for TBEP seagrass management area 7.
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend Inset
Figure 14: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 8.
0
100
200
300
400
500
600
700
800
900
1000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0008)Continuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0004)
Inset
Figure 15: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 9.
0
500
1000
1500
2000
2500
3000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0123)
Inset
Figure 16: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 10.
0
20
40
60
80
100
120
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0953)Continuous Seagrasses - Increasing Trend (p=0.0371)Total Seagrasses - Increasing Trend (p=0.0606)
Inset
Figure 17: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 11.
0
1000
2000
3000
4000
5000
6000
7000
8000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - Increasing Trend (p=0.0218)Total Seagrasses - Increasing Trend (p=0.0067)
Inset
Figure 18: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 12.
0
100
200
300
400
500
600
700
800
900
1000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0606)Continuous Seagrasses - Increasing Trend (p=0.0008)Total Seagrasses - Increasing Trend (p=0.0008)
Inset
Figure 19: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 13.
0
100
200
300
400
500
600
700
800
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Increasing Trend (p=0.0953)Continuous Seagrasses - Increasing Trend (p=0.0004)Total Seagrasses - Increasing Trend (p=0.0008)
Inset
Figure 20: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 14.
0
50
100
150
200
250
300
350
400
450
500
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0371)Continuous Seagrasses - Increasing Trend (p=0.0008)Total Seagrasses - Increasing Trend (p=0.0008)
Inset
Figure 21: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 15.
0
200
400
600
800
1000
1200
1400
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - Increasing Trend (p=0.0067)Total Seagrasses - Increasing Trend (p=0.0953)
Inset
Figure 22: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 16.
0
200
400
600
800
1000
1200
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Decreasing Trend (p=0.0218)Continuous Seagrasses - Increasing Trend (p=0.0035)Total Seagrasses - Increasing Trend (p=0.0371)
Inset
Figure 23: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 17.
0
100
200
300
400
500
600
700
800
900
1000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0606)
Inset
Figure 24: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 18.
0
200
400
600
800
1000
1200
1400
1600
1800
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 25: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 19.
0
200
400
600
800
1000
1200
1400
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Decreasing Trend (p=0.0606)Continuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 26: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 20.
0
100
200
300
400
500
600
700
800
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No trendContinuous Seagrasses - No trendTotal Seagrasses - No Trend
Inset
Figure 27: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 21.
0
100
200
300
400
500
600
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - Increasing Trend (p=0.0218)Continuous Seagrasses - No TrendTotal Seagrasses - Increasing Trend (p=0.0123)
Inset
Figure 28: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 22.
0
100
200
300
400
500
600
700
800
900
1000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 29: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 23.
0
200
400
600
800
1000
1200
1400
1600
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 30: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 24.
0
200
400
600
800
1000
1200
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - Decreasing Trend (p=0.0371)
Inset
Figure 31: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 25.
0
50
100
150
200
250
300
350
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No TrendInset
Figure 32: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 26.
0
200
400
600
800
1000
1200
1400
1600
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - Increasing Trend (p=0.0953)Continuous Seagrasses - Increasing Trend (p=0.0371)Total Seagrasses - Increasing Trend (p=0.0008)
Inset
Figure 33: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 27.
0
10
20
30
40
50
60
70
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)
Patchy Seagrasses - No trendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 34: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 28.
0
5
10
15
20
25
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007Year
Seag
rass
Cov
erag
e (a
cres
)Patchy Seagrasses - No TrendContinuous Seagrasses - No TrendTotal Seagrasses - No Trend
Inset
Figure 35: Estimated patchy, continuous, and total seagrass acreages and results of trend
analysis for TBEP seagrass management area 29.
Figure 36: Spatial distribution of water quality target attainment for the 30 Tampa Bay Estuary Program seagrass
management areas according to the decision matrix for 2006.
APPENDIX 1: Historic Water Quality Target Attainment in the Seagrass
Management Areas
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=58
TBEP Seagrass Management Area=1
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
-10
0
10
20
30
40
50
60
70
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=6, 44, 70
TBEP Seagrass Management Area=2
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
60
70
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=8, 52, 55, 71
TBEP Seagrass Management Area=3
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
60
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=6, 7
TBEP Seagrass Management Area=4
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
60
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=73, 80
TBEP Seagrass Management Area=5
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=9, 80, 81, 84
TBEP Seagrass Management Area=6
Target: 7.4 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=16, 19, 21
TBEP Seagrass Management Area=7
Target: 7.4 ug/LChl
orop
hyll-
a (u
g/L)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=22, 24, 90
TBEP Seagrass Management Area=8
Target: 4.6 ug/L
Chl
orop
hyll-
a (u
g/L)
1
2
3
4
5
6
7
8
9
10
11
12
13
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=93
TBEP Seagrass Management Area=11
Target: 4.6 ug/L
Chl
orop
hyll-
a (u
g/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=96
TBEP Seagrass Management Area=12
Target: 4.6 ug/L
Chl
orop
hyll-
a (u
g/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=25
TBEP Seagrass Management Area=16
Target: 4.6 ug/L
Chl
orop
hyll-
a (u
g/L)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=28
TBEP Seagrass Management Area=17
Target: 7.4 ug/L
Chl
orop
hyll-
a (u
g/L)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=32
TBEP Seagrass Management Area=18
Target: 7.4 ug/L
Chl
orop
hyll-
a (u
g/L)
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): Mean OTB & MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=68
TBEP Seagrass Management Area=19
Target: 7.95 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=38, 67
TBEP Seagrass Management Area=20
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=42, 62
TBEP Seagrass Management Area=21
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=65
TBEP Seagrass Management Area=22
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
50
60
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=46, 64
TBEP Seagrass Management Area=23
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=47, 60, 61, 62
TBEP Seagrass Management Area=24
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=40, 41, 50, 51, 63
TBEP Seagrass Management Area=25
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=36, 51
TBEP Seagrass Management Area=26
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=11, 13, 32, 33
TBEP Seagrass Management Area=27
Target: 7.4 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=38, 67
TBEP Seagrass Management Area=28
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=52, 55, 80
TBEP Seagrass Management Area=29
Target: 13.2 ug/L
Chl
orop
hyll-
a (u
g/L)
0
10
20
30
40
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Chlorophyll-a (ug/L): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=28, 82
TBEP Seagrass Management Area=30
Target: 8.5 ug/L
Chl
orop
hyll-
a (u
g/L)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=58
TBEP Seagrass Management Area=1
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
5
6
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=6, 44, 70
TBEP Seagrass Management Area=2
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=8, 52, 55, 71
TBEP Seagrass Management Area=3
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=6, 7
TBEP Seagrass Management Area=4
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=73, 80
TBEP Seagrass Management Area=5
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=9, 80, 81, 84
TBEP Seagrass Management Area=6
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=16, 19, 21
TBEP Seagrass Management Area=7
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=22, 24, 90
TBEP Seagrass Management Area=8
Target: 0.63 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=93
TBEP Seagrass Management Area=11
Target: 0.63 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=96
TBEP Seagrass Management Area=12
Target: 0.63 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): LTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=25
TBEP Seagrass Management Area=16
Target: 0.63 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=28
TBEP Seagrass Management Area=17
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=32
TBEP Seagrass Management Area=18
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): Mean OTB & MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=68
TBEP Seagrass Management Area=19
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=38, 67
TBEP Seagrass Management Area=20
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=42, 62
TBEP Seagrass Management Area=21
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=65
TBEP Seagrass Management Area=22
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=46, 64
TBEP Seagrass Management Area=23
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=47, 60, 61, 62
TBEP Seagrass Management Area=24
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=40, 41, 50, 51, 63
TBEP Seagrass Management Area=25
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=36, 51
TBEP Seagrass Management Area=26
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=11, 13, 32, 33
TBEP Seagrass Management Area=27
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): OTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=38, 67
TBEP Seagrass Management Area=28
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): HB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=52, 55, 80
TBEP Seagrass Management Area=29
Target: 1.58 m-1
Ligh
t Atte
nuat
ion
(per
m)
0
1
2
3
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006
1974 - 2006 Estimated Light Attenuation (Secchi Depths): MTB TargetsAnnual Averages +/- 95% Confidence Intervals; EPC Stations=28, 82
TBEP Seagrass Management Area=30
Target: 0.83 m-1
Ligh
t Atte
nuat
ion
(per
m)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Year
1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006