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Little Sarasota Bay Condition Report for 2015

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Caution

2 out of 3 indicators were rated as PASS.

All three indicators must pass
for the bay to be rated as PASS.

Learn more about how this report is created

Summary:

While the overall health of Little Sarasota Bay is good, the concentration of chlorophyll a in the bay increased markedly during the latter half of 2015. Despite this increase, dissolved oxygen concentration improved somewhat. Light attenuation increased slightly, undoubtedly due in part to the higher chlorophyll a levels.

Water Quality: The ratings for nitrogen and phosphorus remained virtually unchanged from their 2014 values, coming in at “Good” and “Excellent, respectively. Reversing an improving trend from the previous year, chlorophyll a concentration increased by 50.7% compared to 2014, pushing its mean value to 0.0104 mg/l, equal to the threshold and demoting its rating from “Excellent” to “Caution.” The mean nitrogen concentration improved slightly, to 0.5363 mg/l. Phosphorus concentration also decreased, to (0.086 mg/l), remaining well below the target of 0.180 mg/l. The mean for chlorophyll a was calculated as an arithmetic mean and the means for nitrogen and phosphorus were calculated as geometric means (per the Numeric Nutrient Criteria outlined in the Florida Administrative Code, section 62-302.532).

Biotic Indicator: Measurement of the biotic indicator, seagrass, was performed in 2014 by the Southwest Florida Water Management District. In recent years, total seagrass acreage in Little Sarasota Bay has held steady and, at 999 acres, is well above the target level of 702 acres.

Bay Location Map

Bays included in this report:

Water Chemistry Ratings

Total nitrogen, total phosphorus, and chlorophyll a levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a bay meets the water quality standards mandated by the Clean Water Act. The trend graphs for these indicators are shown below, along with their target and threshold values. A target value is a desirable goal to be attained, while a threshold is an undesirable level which is to be avoided. Learn More about these ratings and how they are calculated »

The Five-year Trend Graphs below illustrate the general trend of water quality parameters. They show a six-month running average, which moderates high and low values in the data.

Caution

Chlorophyll a

Score: Caution How was this determined?
Units: mg/l Year
2015
Historical
period of record
High 0.0304 0.0626
Mean 0.0104 0.0078 0.00712149 0.0082000000
Low 0.0021 0.0001
No. of Samples 75 1,395

Five-year Trend Graph

     
1/1/20112.8970.0028900mg/l
2/1/20112.5870.0027400mg/l
3/1/20113.7170.0030600mg/l
4/1/201114.0370.0058000mg/l
5/1/20115.8270.0058100mg/l
6/1/20116.4070.0059100mg/l
7/1/201111.2870.0073000mg/l
8/1/201114.3970.0092700mg/l
9/1/201113.3470.0108800mg/l
10/1/20119.5470.0101300mg/l
11/1/20118.4670.0105700mg/l
12/1/20113.8570.0101400mg/l
1/1/20122.8670.0087400mg/l
2/1/20126.4370.0074100mg/l
3/1/20126.0770.0062000mg/l
4/1/20123.6470.0052200mg/l
5/1/20124.8060.0046100mg/l
6/1/20127.8960.0052800mg/l
7/1/20129.0460.0063100mg/l
8/1/201215.2760.0077900mg/l
9/1/201212.9660.0089300mg/l
10/1/20129.4260.0099000mg/l
11/1/20127.4060.0103300mg/l
12/1/20123.0660.0095300mg/l
1/1/20133.6960.0086300mg/l
2/1/20134.7860.0068900mg/l
3/1/20134.4360.0054600mg/l
4/1/20134.7360.0046800mg/l
5/1/20133.9560.0041100mg/l
6/1/20137.3360.0048200mg/l
7/1/201319.9160.0075200mg/l
8/1/201313.1160.0089100mg/l
9/1/201315.9060.0108200mg/l
10/1/201333.5960.0156300mg/l
11/1/20138.2960.0163600mg/l
12/1/20133.4160.0157000mg/l
1/1/20143.6060.0129800mg/l
2/1/20143.3460.0113600mg/l
3/1/20144.0560.0093800mg/l
4/1/20145.1560.0046400mg/l
5/1/20146.7660.0043900mg/l
6/1/20146.2560.0048600mg/l
7/1/20146.0660.0052700mg/l
8/1/20145.3260.0056000mg/l
9/1/20146.0960.0059400mg/l
10/1/201421.0070.0085800mg/l
11/1/20146.0460.0084600mg/l
12/1/20146.4270.0084900mg/l
1/1/201513.4560.0097200mg/l
2/1/20153.1160.0093500mg/l
3/1/20154.8770.0091500mg/l
4/1/20153.2760.0061900mg/l
5/1/20153.1970.0057200mg/l
6/1/20153.8160.0052800mg/l
7/1/20155.8560.0040200mg/l
8/1/201516.4560.0062400mg/l
9/1/201519.5460.0086900mg/l
10/1/201519.2960.0113600mg/l
11/1/201518.8970.0139700mg/l
12/1/201514.3960.0157400mg/l
Loading Chart...
Target
0.0082 mg/l
Threshold
0.0104 mg/l
Good

Nitrogen, Total

Units: mg/l Year
2015
Historical
period of record
High 0.845 1.175
Mean 0.5363 0.17065049 0.5200000000
Low 0.315 0.055
No. of Samples 75 1,359

Five-year Trend Graph

     
1/1/2011290.6760.2906700mg/l
2/1/2011277.5060.2840900mg/l
3/1/2011551.6760.3732800mg/l
4/1/2011633.1760.4382500mg/l
5/1/2011593.5060.4693000mg/l
6/1/2011541.6760.4813600mg/l
7/1/2011538.3360.5226400mg/l
8/1/2011651.6760.5850000mg/l
9/1/2011761.6760.6200000mg/l
10/1/2011521.6760.6014200mg/l
11/1/2011540.3360.5925600mg/l
12/1/2011418.3360.5720000mg/l
1/1/2012380.0060.5456100mg/l
2/1/2012501.6760.5206100mg/l
3/1/2012545.0060.4845000mg/l
4/1/2012456.6760.4736700mg/l
5/1/2012393.3360.4491700mg/l
6/1/2012353.3360.4383300mg/l
7/1/2012639.5060.4815800mg/l
8/1/2012640.0060.5046400mg/l
9/1/2012715.0060.5329700mg/l
10/1/2012658.3360.5665800mg/l
11/1/2012442.3360.5747500mg/l
12/1/2012299.0060.5656900mg/l
1/1/2013385.0060.5232800mg/l
2/1/2013378.3360.4796700mg/l
3/1/2013283.3360.4077200mg/l
4/1/2013436.6760.3707800mg/l
5/1/2013491.6760.3790000mg/l
6/1/2013511.1760.4143600mg/l
7/1/2013810.0060.4852000mg/l
8/1/2013765.0060.5496400mg/l
9/1/2013846.6760.6435300mg/l
10/1/20131018.8360.7405600mg/l
11/1/2013621.6760.7622200mg/l
12/1/2013556.3360.7697500mg/l
1/1/2014421.6760.7050300mg/l
2/1/2014483.3360.6580800mg/l
3/1/2014513.3360.6025300mg/l
4/1/2014492.0060.5147200mg/l
5/1/2014566.6760.5055600mg/l
6/1/2014583.3360.5100600mg/l
7/1/2014535.8360.5290800mg/l
8/1/2014609.0060.5500300mg/l
9/1/2014709.1760.5826700mg/l
10/1/2014857.8670.6436400mg/l
11/1/2014606.6760.6503100mg/l
12/1/2014546.4370.6441600mg/l
1/1/2015616.3360.6575800mg/l
2/1/2015405.0060.6235800mg/l
3/1/2015469.2970.5836000mg/l
4/1/2015340.0060.4972900mg/l
5/1/2015469.2970.4743900mg/l
6/1/2015498.3360.4663700mg/l
7/1/2015542.0060.4539900mg/l
8/1/2015703.3360.5037100mg/l
9/1/2015740.0060.5488300mg/l
10/1/2015638.5060.5985800mg/l
11/1/2015653.5770.6292900mg/l
12/1/2015551.6760.6381800mg/l
Loading Chart...
Target
0.52 mg/l
Threshold
0.60 mg/l
Excellent

Phosphorus, Total

Score: Excellent How was this determined?
Units: mg/l Year
2015
Historical
period of record
High 0.20 0.699
Mean 0.086 0.07698541 0.1800000000
Low 0.05 0.05
No. of Samples 75 1,395

Five-year Trend Graph

     
1/1/201166.0070.0660000mg/l
2/1/2011110.2970.0881500mg/l
3/1/2011167.1470.1144800mg/l
4/1/2011187.2970.1326800mg/l
5/1/2011197.0070.1455400mg/l
6/1/2011109.5770.1395500mg/l
7/1/2011106.0070.1462200mg/l
8/1/2011139.5770.1511000mg/l
9/1/2011117.0070.1427400mg/l
10/1/2011134.8670.1340000mg/l
11/1/201190.7170.1162900mg/l
12/1/2011128.4370.1194300mg/l
1/1/201295.0070.1176000mg/l
2/1/2012130.5770.1161000mg/l
3/1/2012182.4370.1270000mg/l
4/1/2012147.5770.1291200mg/l
5/1/201268.3360.1253900mg/l
6/1/201290.0060.1189800mg/l
7/1/2012156.6760.1292600mg/l
8/1/2012136.6760.1302800mg/l
9/1/2012138.3360.1229300mg/l
10/1/2012101.6760.1152800mg/l
11/1/201290.0060.1188900mg/l
12/1/201270.0060.1155600mg/l
1/1/201361.6760.0997200mg/l
2/1/201361.6760.0872200mg/l
3/1/2013116.6760.0836100mg/l
4/1/201381.6760.0802800mg/l
5/1/201351.6760.0738900mg/l
6/1/201391.6760.0775000mg/l
7/1/2013155.0060.0930600mg/l
8/1/2013120.0060.1027800mg/l
9/1/2013110.0060.1016700mg/l
10/1/2013188.3360.1194500mg/l
11/1/2013108.3360.1288900mg/l
12/1/201371.6760.1255600mg/l
1/1/201466.6760.1108300mg/l
2/1/201480.0060.1041700mg/l
3/1/201496.6760.1019500mg/l
4/1/201498.3360.0869500mg/l
5/1/2014115.0060.0880600mg/l
6/1/2014105.0060.0936100mg/l
7/1/2014106.6760.1002800mg/l
8/1/201483.3360.1008300mg/l
9/1/201491.6760.1000000mg/l
10/1/2014100.0070.1002800mg/l
11/1/2014115.0060.1002800mg/l
12/1/201450.0070.0911100mg/l
1/1/201596.6760.0894500mg/l
2/1/201581.6760.0891700mg/l
3/1/201554.2970.0829400mg/l
4/1/2015110.0060.0846100mg/l
5/1/201568.5770.0768700mg/l
6/1/201565.0060.0793700mg/l
7/1/201588.3360.0779800mg/l
8/1/2015108.3360.0824200mg/l
9/1/2015101.6760.0903200mg/l
10/1/201595.0060.0878200mg/l
11/1/2015137.1470.0992500mg/l
12/1/201590.0060.1034100mg/l
Loading Chart...
Target
0.18 mg/l
Threshold
0.21 mg/l

Dissolved Oxygen

Units: mg/l Year
2015
Historical
period of record
High 9.00 11.60
Mean 6.86 6.57 1.17293
Low 3.90 2.80
No. of Samples 72 1,505

Five-year Trend Graph

     
1/1/20117.7067.7000000mg/l
2/1/20118.2867.9900000mg/l
3/1/20117.1367.7000000mg/l
4/1/20117.1267.5600000mg/l
5/1/20115.4767.1400000mg/l
6/1/20115.9366.9400000mg/l
7/1/20115.5366.5800000mg/l
8/1/20115.3366.0900000mg/l
9/1/20116.6366.0000000mg/l
10/1/20116.1565.8400000mg/l
11/1/20116.7866.0600000mg/l
12/1/20118.2566.4500000mg/l
1/1/20127.9066.8400000mg/l
2/1/20126.6367.0600000mg/l
3/1/20127.3867.1800000mg/l
4/1/20126.4867.2400000mg/l
5/1/20126.5267.1900000mg/l
6/1/20125.7066.7700000mg/l
7/1/20125.4366.3600000mg/l
8/1/20125.1566.1100000mg/l
9/1/20125.7365.8400000mg/l
10/1/20126.1365.7800000mg/l
11/1/20126.3265.7400000mg/l
12/1/20126.3765.8600000mg/l
1/1/20136.5066.0300000mg/l
2/1/20138.1066.5300000mg/l
3/1/20136.9066.7200000mg/l
4/1/20136.5866.8000000mg/l
5/1/20136.6366.8500000mg/l
6/1/20135.2766.6600000mg/l
7/1/20137.1366.7700000mg/l
8/1/20135.2866.3000000mg/l
9/1/20136.2566.1900000mg/l
10/1/20136.0266.1000000mg/l
11/1/20137.2866.2100000mg/l
12/1/20136.7066.4400000mg/l
1/1/20147.3366.4800000mg/l
2/1/20147.9066.9100000mg/l
3/1/20146.7767.0000000mg/l
4/1/20147.0567.1700000mg/l
5/1/20147.5867.2200000mg/l
6/1/20145.8067.0700000mg/l
7/1/20144.8266.6500000mg/l
8/1/20143.6065.9400000mg/l
9/1/20144.6565.5800000mg/l
10/1/20146.8265.5500000mg/l
11/1/20147.6065.5500000mg/l
12/1/20146.4365.6500000mg/l
1/1/20156.8866.0000000mg/l
2/1/20158.1366.7500000mg/l
3/1/20157.6067.2400000mg/l
4/1/20157.0867.2900000mg/l
5/1/20156.7567.1500000mg/l
6/1/20157.4067.3100000mg/l
7/1/20155.0066.9900000mg/l
8/1/20157.8866.9500000mg/l
9/1/20156.0866.7000000mg/l
10/1/20156.3366.5700000mg/l
11/1/20156.3566.5100000mg/l
12/1/20156.7866.4000000mg/l
Loading Chart...
Target
mg/l
Threshold
0.00 mg/l

Light Attenuation

Units: K(1/m) Year
2015
Historical
period of record
High 2.01 2.98
Mean 0.96 1.0 0.43716
Low 0.29 0.08
No. of Samples 72 1,269

Five-year Trend Graph

     
1/1/20110.3860.3800000K(1/m)
2/1/20110.5760.4800000K(1/m)
3/1/20111.0260.6600000K(1/m)
4/1/20111.2860.8100000K(1/m)
5/1/20110.7960.8100000K(1/m)
6/1/20110.7760.8000000K(1/m)
7/1/20111.0260.9100000K(1/m)
8/1/20111.2361.0200000K(1/m)
9/1/20111.5461.1100000K(1/m)
10/1/20111.1361.0800000K(1/m)
11/1/20111.0661.1300000K(1/m)
12/1/20110.6861.1100000K(1/m)
1/1/20120.8161.0800000K(1/m)
2/1/20121.2061.0700000K(1/m)
3/1/20121.1061.0000000K(1/m)
4/1/20120.7660.9400000K(1/m)
5/1/20120.5060.8400000K(1/m)
6/1/20120.8460.8700000K(1/m)
7/1/20121.1260.9200000K(1/m)
8/1/20121.6761.0000000K(1/m)
9/1/20121.6961.1000000K(1/m)
10/1/20121.3661.2000000K(1/m)
11/1/20121.0461.2900000K(1/m)
12/1/20120.8161.2800000K(1/m)
1/1/20130.6761.2100000K(1/m)
2/1/20130.7561.0500000K(1/m)
3/1/20130.8760.9200000K(1/m)
4/1/20130.8260.8300000K(1/m)
5/1/20130.6460.7600000K(1/m)
6/1/20130.9660.7900000K(1/m)
7/1/20131.7060.9600000K(1/m)
8/1/20131.1861.0300000K(1/m)
9/1/20131.4561.1300000K(1/m)
10/1/20131.8261.2900000K(1/m)
11/1/20131.0061.3500000K(1/m)
12/1/20130.6461.3000000K(1/m)
1/1/20140.4761.0900000K(1/m)
2/1/20140.6061.0000000K(1/m)
3/1/20140.7960.8900000K(1/m)
4/1/20140.9460.7400000K(1/m)
5/1/20140.8260.7100000K(1/m)
6/1/20140.8460.7400000K(1/m)
7/1/20140.7460.7900000K(1/m)
8/1/20140.7260.8100000K(1/m)
9/1/20140.7860.8100000K(1/m)
10/1/20141.9060.9700000K(1/m)
11/1/20140.9260.9800000K(1/m)
12/1/20140.6060.9400000K(1/m)
1/1/20150.9060.9700000K(1/m)
2/1/20150.9461.0100000K(1/m)
3/1/20150.8161.0100000K(1/m)
4/1/20150.6460.8000000K(1/m)
5/1/20150.6160.7500000K(1/m)
6/1/20150.7160.7700000K(1/m)
7/1/20150.5960.7200000K(1/m)
8/1/20151.2060.7600000K(1/m)
9/1/20151.4460.8700000K(1/m)
10/1/20151.3660.9900000K(1/m)
11/1/20151.2561.0900000K(1/m)
12/1/20151.0761.1500000K(1/m)
Loading Chart...
Target
K(1/m)
Threshold
0.00 K(1/m)

Rainfall

Units: inches/yr Year
2015
Historical
period of record
High 46.07 47.76
Mean 35.27 12.6061430167297
Low 7.86
No. of Samples 365 4,774

Five-year Trend Graph

     
1/1/20112.77312.7700000inches
2/1/20110.39280.3900000inches
3/1/20117.36317.3600000inches
4/1/20110.88300.8800000inches
5/1/20112.51312.5100000inches
6/1/20112.94302.9400000inches
7/1/20116.35316.3500000inches
8/1/20119.13319.1300000inches
9/1/20114.36304.3600000inches
10/1/20111.40301.4000000inches
11/1/20111.76301.7600000inches
12/1/20110.42300.4200000inches
1/1/20120.69290.6900000inches
2/1/20120.65290.6500000inches
3/1/20121.38311.3800000inches
4/1/20121.40241.4000000inches
5/1/20121.89311.8900000inches
6/1/201213.373013.3700000inches
7/1/20125.10315.1000000inches
8/1/20126.55316.5500000inches
9/1/20123.32303.3200000inches
10/1/20121.98311.9800000inches
11/1/20120.01280.0100000inches
12/1/20122.04312.0400000inches
1/1/20130.26310.2600000inches
2/1/20131.01231.0100000inches
3/1/20131.53301.5300000inches
4/1/20132.81302.8100000inches
5/1/20132.05312.0500000inches
6/1/201314.823014.8200000inches
7/1/20136.29316.2900000inches
8/1/20138.54318.5400000inches
9/1/20138.04308.0400000inches
10/1/20131.05311.0500000inches
11/1/20131.19301.1900000inches
12/1/20130.17310.1700000inches
1/1/20145.24315.2400000inches
2/1/20141.28281.2800000inches
3/1/20144.63314.6300000inches
4/1/20141.34291.3400000inches
5/1/20144.16314.1600000inches
6/1/20143.57303.5700000inches
7/1/20143.33313.3300000inches
8/1/20144.10284.1000000inches
9/1/20147.31257.3100000inches
10/1/20142.32292.3200000inches
11/1/20143.07303.0700000inches
12/1/20140.44310.4400000inches
1/1/20151.91311.9100000inches
2/1/20155.14285.1400000inches
3/1/20152.43312.4300000inches
4/1/20150.65300.6500000inches
5/1/20151.98311.9800000inches
6/1/20153.00303.0000000inches
7/1/201513.033113.0300000inches
8/1/20155.46315.4600000inches
9/1/20157.42307.4200000inches
10/1/20151.59311.5900000inches
11/1/20150.74300.7400000inches
12/1/20152.72312.7200000inches
Loading Chart...
Target
inches/yr
Threshold
inches/yr

Salinity

Units: PSS Year
2015
Historical
period of record
High 35.20 39.50
Mean 29.7 30.71 4.80738
Low 19.90 7.30
No. of Samples 72 1,505

Five-year Trend Graph

     
1/1/201132.28632.2800000PSS
2/1/201130.58631.4300000PSS
3/1/201134.05632.3000000PSS
4/1/201124.23630.2900000PSS
5/1/201130.57630.3400000PSS
6/1/201134.80631.0900000PSS
7/1/201131.58630.9700000PSS
8/1/201132.33631.2600000PSS
9/1/201124.05629.5900000PSS
10/1/201129.42630.4600000PSS
11/1/201132.65630.8100000PSS
12/1/201132.63630.4400000PSS
1/1/201233.22630.7200000PSS
2/1/201233.58630.9300000PSS
3/1/201235.35632.8100000PSS
4/1/201236.55634.0000000PSS
5/1/201236.13634.5800000PSS
6/1/201233.00634.6400000PSS
7/1/201225.50633.3500000PSS
8/1/201227.77632.3800000PSS
9/1/201228.00631.1600000PSS
10/1/201226.42629.4700000PSS
11/1/201233.67629.0600000PSS
12/1/201233.68629.1700000PSS
1/1/201333.08630.4400000PSS
2/1/201333.55631.4000000PSS
3/1/201333.42632.3000000PSS
4/1/201332.05633.2400000PSS
5/1/201332.73633.0900000PSS
6/1/201335.40633.3700000PSS
7/1/201322.20631.5600000PSS
8/1/201325.45630.2100000PSS
9/1/201320.17628.0000000PSS
10/1/201320.95626.1500000PSS
11/1/201328.95625.5200000PSS
12/1/201331.25624.8300000PSS
1/1/201432.88626.6100000PSS
2/1/201431.53627.6200000PSS
3/1/201432.10629.6100000PSS
4/1/201429.00630.9500000PSS
5/1/201427.45630.7000000PSS
6/1/201432.33630.8800000PSS
7/1/201431.97630.7300000PSS
8/1/201432.62630.9100000PSS
9/1/201431.52630.8200000PSS
10/1/201420.27629.3600000PSS
11/1/201430.33629.8400000PSS
12/1/201429.10629.3000000PSS
1/1/201532.23629.3500000PSS
2/1/201530.20628.9400000PSS
3/1/201528.72628.4800000PSS
4/1/201531.27630.3100000PSS
5/1/201534.15630.9500000PSS
6/1/201533.95631.7500000PSS
7/1/201534.68632.1600000PSS
8/1/201520.97630.6200000PSS
9/1/201524.33629.8900000PSS
10/1/201523.37628.5800000PSS
11/1/201530.63627.9900000PSS
12/1/201531.90627.6500000PSS
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Turbidity

Units: NTU Year
2015
Historical
period of record
High 18.00 18.00
Mean 3.85 3.96 2.03652
Low 1.30 0.60
No. of Samples 75 1,395

Five-year Trend Graph

     
1/1/20111.6071.6000000NTU
2/1/20113.4772.5400000NTU
3/1/20114.3373.1300000NTU
4/1/20117.6974.2700000NTU
5/1/20115.2674.4700000NTU
6/1/20113.4674.3000000NTU
7/1/20114.3474.7600000NTU
8/1/20114.9375.0000000NTU
9/1/20116.0775.2900000NTU
10/1/20115.5774.9400000NTU
11/1/20113.8774.7100000NTU
12/1/20113.4174.7000000NTU
1/1/20123.6474.5800000NTU
2/1/20127.0674.9400000NTU
3/1/20127.6775.2000000NTU
4/1/20125.2075.1400000NTU
5/1/20123.8865.1400000NTU
6/1/20124.6765.3500000NTU
7/1/20125.2765.6300000NTU
8/1/20125.1265.3000000NTU
9/1/20128.0065.3600000NTU
10/1/20125.1365.3500000NTU
11/1/20124.8765.5100000NTU
12/1/20123.0565.2400000NTU
1/1/20132.3864.7600000NTU
2/1/20134.0064.5700000NTU
3/1/20133.5363.8300000NTU
4/1/20134.8363.7800000NTU
5/1/20134.1763.6600000NTU
6/1/20134.4263.8900000NTU
7/1/20135.1564.3500000NTU
8/1/20133.7364.3100000NTU
9/1/20136.2864.7600000NTU
10/1/20135.3364.8500000NTU
11/1/20134.5264.9100000NTU
12/1/20132.9864.6700000NTU
1/1/20142.4564.2200000NTU
2/1/20141.9063.9100000NTU
3/1/20143.1763.3900000NTU
4/1/20143.6563.1100000NTU
5/1/20143.3762.9200000NTU
6/1/20142.7862.8900000NTU
7/1/20142.6862.9300000NTU
8/1/20142.6263.0500000NTU
9/1/20142.3862.9100000NTU
10/1/20145.0073.1400000NTU
11/1/20142.7063.0300000NTU
12/1/20141.4872.8100000NTU
1/1/20155.7863.3300000NTU
2/1/20153.7363.5100000NTU
3/1/20152.6973.5600000NTU
4/1/20153.6263.3300000NTU
5/1/20152.9473.3700000NTU
6/1/20152.4263.5300000NTU
7/1/20152.2862.9500000NTU
8/1/20153.9362.9800000NTU
9/1/20154.2563.2400000NTU
10/1/20155.3263.5200000NTU
11/1/20155.5173.9500000NTU
12/1/20153.7764.1800000NTU
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Other Measures of Bay Health

In addition to nutrient levels and chlorophyll concentration, dissolved oxygen levels, and water clarity are also objective indicators of bay health. These have complex interactive cycles which are affected by rainfall, temperature, and tidal action, as well as other factors. High nutrient levels (nitrogen and phosphorus) can stimulate excessive growth of marine algae (indicated by chlorophyll a level), resulting in reduced water clarity (and increased light attenuation) and depleted oxygen levels. Both plants and animals in a bay need oxygen to survive, and the seagrasses which provide food and cover for bay creatures need light for photosynthesis.

Bay Contour Maps (2015)

Contour mapping is one of the best ways to visualize spatial differences in coastal water quality. The interactive map shown below presents monthly data for one selected water quality indicator atop an aerial view of the bay. Choose a different water quality parameter from the list at the top to change the map. Learn More about Water Quality Contour Mapping »

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Contour Visibility:

Visit the Water Quality Contour Mapping Tool to view and compare monthly water quality contour maps for ten different water quality indicators. In addition, you can generate your own custom maps.

Contour Legend:

  • Less than 1 mg/l
  • 1.0 - 5.9 mg/l
  • 6.0 - 10.9 mg/l
  • 11.0 - 17.9 mg/l
  • Greater than 18 mg/l

Seagrasses

Among the most important habitats in Florida's estuarine environments, seagrass beds are indispensable for the role they play in cycling nutrients, supplying food for wildlife, stabilizing sediments, and providing habitat for juvenile and adult finfish and shellfish. Use the interactive map below to observe the size, density and location of seagrass beds from year to year. The graph shows how the total amount of seagrass in the bay has changed over time. Learn More about Seagrasses »

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Target
702 acres

Land Use / Land Cover

Land use within a bay's watershed has a major effect on its water quality. In general, less development means better water quality. Land Cover/Land Use classifications categorize land in terms of its observed physical surface characteristics (upland or wetland, e.g.), and also reflect the types of activity that are taking place on it (agriculture, urban/built-up, utilities, etc.). Florida uses as its standard a set of statewide classifications which were developed by the Florida Department of Transportation. Learn More about Land Use and Land Cover »

Little Sarasota Bay is located within the Little Sarasota Bay Watershed. The chart below shows the land use / land cover characteristics for Little Sarasota Bay Watershed within the boundary of this Water Atlas. View details about the Little Sarasota Bay Watershed »

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