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25 June 2005 Kim Hanes SFWMD 8894 Belvedere Road West Palm Beach, FL 33411

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25 June 2005 Kim Hanes SFWMD 8894 Belvedere Road West Palm Beach, FL 33411 Southeast Environmental Research Center OE-148 Florida International University, Miami, FL 33199 305-348-3095, 305-348-4096 fax, http://serc.fiu.edu 25 June 2005 Kim Hanes SFWMD 8894 Belvedere Road West Palm Beach, FL 33411 Re: South Florida Coastal Water Quality Monitoring Network – 1-3/05 Quarterly Report (C-15397) Dear Mr. Hanes: This letter serves to transmit the South Florida Coastal Water Quality Monitoring Network Quarterly Report as per our SFWMD/SERC Cooperative Agreement #C-15397. This report consists of this letter along with corresponding tables and figures. Project Background This report includes water quality data collected monthly during the annual period of record (POR) Jan. – Mar. 2005 from 28 stations in Florida Bay, 22 stations in Whitewater Bay, 25 stations in Ten Thousand Islands, 25 stations in Biscayne Bay, and 28 stations in Cape Romano-Rookery Bay-Pine Island Sound. A total of 49 stations were also collected on the SW Florida Shelf on a quarterly basis. Figure 1 shows the location of the fixed sampling stations. Water quality parameters monitored at each station include the dissolved nutrients nitrate + nitrite (NOx), nitrite (NO2), nitrate (NO3), ammonium (NH4), inorganic nitrogen (DIN), and soluble reactive phosphorus (SRP). Silicate (Si(OH)4) was analyzed at all stations on a quarterly basis in conjunction with SW Shelf sampling. Total concentrations of nitrogen (TN), organic nitrogen (TON), phosphorus (TP), and organic carbon (TOC) were also measured. All concentrations for each of these parameters are reported as parts per million (ppm) except where noted. Biological parameters monitored included chlorophyll a (µg l-1) and alkaline phosphatase activity (APA; µM hr-1). Field parameters measured at both surface and bottom of the water column include salinity, dissolved oxygen (DO; mg l-1), and temperature (oC). Turbidity (NTU) of the surface water was also measured. Data Results A previous spatial analysis of data from Florida Bay resulted in the delineation of 3 groups of stations which have robust similarities in water quality (Fig. 2). We have argued that these spatially contiguous groups of stations are the result of similar loading and processing of materials, hence we call them 'zones of similar influence'. The Eastern Bay zone (FBE) acts most like a 'conventional' estuary in that it has a quasi-longitudinal salinity gradient caused by the mixing of freshwater runoff with seawater. In contrast, the Central Bay (FBC) is a hydrographically isolated area with low and infrequent terrestrial freshwater input, a long water residence time, and high evaporative potential. The Western Bay zone (FBW) is the most influenced by the Gulf of Mexico tides and is also isolated from direct overland freshwater sources. Station #7 - Highway Creek did not cluster out with any of the Florida Bay stations and was considered separately. Using the same statistical approach as above, the TTI-WWB complex was partitioned into 6 distinct zones of similar water quality (Fig. 3). The first cluster was composed of 13 stations in and around the Shark, Harney, Broad, and Lostmans Rivers and is called the Mangrove River (MR) group. This cluster also included a sampling station just off the Faka Union Canal. The second cluster was made up of the 8 stations enclosed within Whitewater Bay proper (WWB). Twelve stations situated mostly in and around the coastal islands of TTI-WWB formed the Gulf Island group (GI). The water quality characteristics at the Coot Bay site were sufficiently different so as to be a cluster of its own. The next cluster contained the northernmost 2 stations in the Blackwater River estuary (BLK). Finally, the Inland Wilderness Waterway zone (IWW) included 11 stations distributed throughout the inside passage as well as the Chatham River and the station off Everglades City. Biscayne Bay was partitioned into 6 distinct ZSI using the above statistical analysis. The first cluster was composed of 2 stations closest to the shore in the south Bay (Fig. 4); they were called the Alongshore group (AS). These are stations most influenced by the Goulds, Military and Mowry Canals. The second cluster was made up of the 5 stations farther from the coast called Inshore (IS). Thirteen stations situated mostly in the bay proper were called the main Bay (MAIN) group. The next cluster contained 3 stations situated in areas of great tidal exchange (ocean channel, not shown). Two stations in Card Sound grouped together SCARD. For purposes of this report, the stations added to the area north of the Rickenbacker Causeway are defined, a priori, as a distinct cluster, North Bay (NBAY). The above statistical analysis objectively classified the 49 Shelf sampling sites into 3 zones having similar water quality (Fig. 5). The first cluster was composed of only 2 stations which were closest to the shore off Cape Sable; they were called the SHARK group, after the Shark River, the main source of freshwater to the region. The second cluster was made up of the 7 more northerly stations nearest the coast and called SHOAL. The remaining stations were called the SHELF group. Sampling in the Rookery Bay area began Jan. 1999, so we now have 5 years of data available. But because of the very heterogeneous nature of the area, we will continue to use generally accepted geomorphological characteristics to group the stations (Fig. 6). These groupings are Cocohatchee River (COCO), Estero Bay (EST), Cape Romano-Marco Island (MARC), Naples Bay (NPL), Pine Island Sound (PIS), Rookery Bay (RB), and San Carlos Bay (SCB). Data are also reported as box-and-whiskers plots (Figs. 7-28). The center horizontal line in the box is the median of the data, the top and bottom of the box are the 25th and 75th percentiles (quartiles), and the ends of the whiskers are the 5th and 95th percentiles. Summary statistics of all water quality parameters by ecosystem are shown in Table 1. The median was chosen because it is a more accurate measure of central tendency in non-normally distributed water quality data. The range is expressed as the minimum (Min.) and maximum (Max.) values for the POR, and n is the number of data points used in the analysis. If you have any questions about the content of this report, please do not hesitate to contact me at 305- 348-4076 or [email protected]. Sincerely, Joseph N. Boyer, Ph.D. Associate Director and Scientist Figure 1: All fixed water quality stations funded by this SFWMD project. Florida Bay Water Quality Zones 25.4 25.2 25.0 24.8 -81.2 -81.0 -80.8 -80.6 -80.4 -80.2 Eastern Bay ( ), Central Bay, ( ), Western Bay ( ) Figure 2. Florida Bay zones. 26.0 75Blackwater River 74 70 73 72 71 69Faka Union Canal 68 64 67 65 66 51 535455 Gulf Islands 52 56Inner Waterway 60 585761 Everglades59 City 62 63 30 29 31 32 33 35 34 25.5 Mangrove 37 Rivers 36 38 39 40 41 4244 Whitewater 45 Bay 43 46 47 4849 50Coot Bay 25.0 -81.5 -81.0 Mangrove Rivers, Whitewater Bay, Gulf Islands, Coot Bay, Blackwater River, Inner Waterway Figure 3. WWB-TTI water quality zones. 26.0 134 133 132 131 130 Miami 129 128 126 127 104 103 109 108 102 111 110 25.5 112 101 124 123 113 122 116 121 135 -80.4 -80.3 -80.2 -80.1 Alongshore, Inshore, Main Bay, North Bay, South Card Sound Figure 4. Biscayne Bay water quality zones. 26.0 363 364 362 365 385 386 361 366 384387 25.5 360 367 383 388 359 368 382 389 369 358 381 390 357 370 380 391 356 371 379 392 399 355 372 378 393 398 25.0 354 373 377 394 397 395 353 374 376 396 352 375 351 24.5 -82.0 -81.5 -81.0 Shark, Shoal, Shelf Figure 5. SW Florida Shelf water quality zones. 26.7 26.6 Pine Island Sound 26.5 San Carlos Bay 26.4 Estero Bay 26.3 26.2 26.1 Naples Bay 26.0 Rookery Bay 25.9 Marco Island 25.8 -82.3 -82.2 -82.1 -82.0 -81.9 -81.8 -81.7 -81.6 Figure 6. SW estuaries. ppm 0.01 0.02 0.03 0.04 0.00 0.0 1.0 2.0 ug/l3.0 4.0 5.0 6.0 7.0 ppm 0.0 0.2 0.4 0.6 0.8 1.0 10 20 30 40 50 60 0 CHLA TP DIN Salinity 1989-06 1989-06 1989-06 1989-06 1989-12 1990-01 1990-01 1990-01 1990-04 1990-06 1990-06 1990-06 1990-08 1990-11 1990-12 1990-11 1990-11 Figure 7.Box-and-whisker plots ofwater 1991-04 1991-04 1991-04 1991-04 1991-09 1991-10 1991-10 1991-10 1992-01 1992-03 1992-03 1992-03 1992-05 1992-08 1992-09 1992-08 1992-08 1993-01 1993-01 1993-01 1993-01 1993-05 1993-06 1993-06 1993-06 1993-09 1993-11 1993-11 1993-11 1994-01 1994-04 1994-05 1994-04 1994-04 Eastern Florida Bay Zone Zone Florida Bay Eastern 1994-09 1994-09 1994-09 1994-09 1995-02 1995-03 1995-03 1995-03 1995-06 1995-08 1995-08 1995-08 1995-10 1996-01 1996-02 1996-01 1996-01 1996-06 1996-06 1996-06 1996-06 1996-10 1996-11 1996-11 1996-11 1997-02 quality inEasternFlorida Bay by survey. 1997-04 1997-04 1997-04 1997-06 1997-09 1997-10 1997-09 1997-09 1998-02 1998-02 1998-02 1998-02 1998-06 1998-07 1998-07 1998-07 1998-11 1999-01 1999-01 1999-01 1999-03 1999-06 1999-07 1999-06 1999-06 1999-11 1999-11 1999-11 1999-11 2000-03 2000-04 2000-04 2000-04 2000-07 2000-09 2000-09 2000-09 2000-11 2001-02 2001-03 2001-02 2001-02 2001-07 2001-07 2001-07 2001-07 2001-11 2001-12 2001-12 2001-12 2002-03 2002-05 2002-05 2002-05 2002-07 2002-10 2002-11 2002-10 2002-10 2003-03 2003-03 2003-03 2003-03 2003-07 2003-08 2003-08 2003-08 2003-11 2004-01 2004-01 2004-01 2004-03 2004-06 2004-07 2004-06 2004-06 2004-11 2004-11 2004-11 2004-11 2005-03 ppm ug/l 0.00 0.02 0.04 0.06 0.08 0.10 0.12 ppm 0.0 0.2 0.4 0.6 0.8 1.0 10 15 20 25 30 35 10 20 30 40 50 60 70 0 5 0 CHLA TP DIN Salinity 1989-06 1989-06 1989-06 1989-06 1989-12 1990-01 1990-01 1990-01 1990-04 1990-06 1990-06 1990-06 1990-08 1990-11 1990-12 1990-11 1990-11 Figure 8.Box-and-whisker plots ofwater 1991-04 1991-04 1991-04 1991-04 1991-09 1991-10 1991-10 1991-10 1992-01 1992-03 1992-03 1992-03 1992-05 1992-08 1992-09 1992-08 1992-08 1993-01 1993-01 1993-01 1993-01 1993-05 1993-06 1993-06 1993-06 1993-09 1993-11 1993-11 1993-11 1994-01 1994-04 1994-05 1994-04 1994-04 Central Florida Bay Zone Zone Bay Florida Central 1994-09 1994-09 1994-09 1994-09 1995-02 1995-03 1995-03 1995-03 1995-06 1995-08 1995-08 1995-08 1995-10 1996-01 1996-02 1996-01 1996-01 1996-06 1996-06 1996-06 1996-06 1996-10 1996-11 1996-11 1996-11 quality inCentralFlorida Bay by survey.
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