87 ° 86 ° 85 ° 84 ° 83 ° 82 ° 81 ° 80 °

87 ° 86 ° 85 ° 84 ° 83 ° 82 ° 81 ° 80 ° 25 ° 26 ° 27 ° 28 ° 29 ° 30 °

25 ° 26 ° 27 ° 28 ° 29 ° 30 ° 87 ° 86 ° 85 ° 84 ° 83 ° 82 ° 81 ° 80 °

87 ° 86 ° 85 ° 84 ° 83 ° 82 ° 81 ° 80 ° 25 ° 26 ° 27 ° 28 ° 29 ° 30 °

25 ° 26 ° 27 ° 28 ° 29 ° 30 °



### 75-10 65-02

75-02 65-01

65-06 65-04

75-03 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-09 75-06

75-07 75-11 75-14 75-12
75-16 

### 75-15

75-13 75-11 

### 75-11

75-21 

### 75-18 75-19 75-17 75-20


### 75-26 75-27

75-22

75-35 75-32 

### 75-25

75-36 75-24 75-31

75-34 

### 75-30 75-28 75-23
75-34

75-31 75-34 75-29

75-33

76-03 76-01 75-37

76-02

76-04 75-04

75-10 65-02

75-02 65-01

65-06 65-04

75-03 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-09 75-06

75-07 75-11 75-14 75-12 75-16 

### 75-15

75-13 75-11 

### 75-11

75-21 

### 75-18 75-19 75-17 75-20



### 75-26 75-27

75-22

75-35 75-32 

### 75-25

75-36 75-24 75-31

75-34 

### 75-30 75-28 75-23
75-34

75-31 75-34 75-33 

### 75-29

75-33



### 76-03 76-01 75-37

76-02

76-04 75-04 

## < 5 5 - 9 10 - 14 15 - 19 20 - 29 30 - 49 50 - 79

> 80 insufficient data 

# Total Phosphorus ( μ g/l) Regional median value 

# Total Alkalinity (mg/l) Regional median value


## < 1.0 1.0 - 1.9 2.0 - 3.9 4.0 - 9.9 10.0 - 19.9 20.0 - 40.0 > 40.0 insufficient data Alabama

Georgia Alabama

Georgia



### < 5.0 5.0 - 5.4 5.5 - 5.9 6.0 - 6.4 6.5 - 6.9 7.0 - 7.5

> 7.5 insufficient data 

## pH Regional median value



### < 400 400 - 599 600 - 799 800 - 999 1000 - 1300 > 1300 insufficient data 

## Total Nitrogen ( μ g/l) Regional median value 

### < 4 4 - 7 8 - 11 12 - 15 16 - 30

> 30 insufficient data 

## Chlorophyll a ( μ g/l) Regional median value 

### < 1.0 1.0 - 1.4 1.5 - 1.9 2.0 - 2.4 2.5 - 3.0

> 3.0 insufficient data 

## Secchi (m) Regional median value 

### < 10 10 - 19 20 - 29 30 - 49 50 - 99 100 - 200

> 200 insufficient data 

## Color (pcu) Regional median value 75-10 65-02

75-02 65-01

65-06 65-04

75-03

75-04 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-11

75-09 75-06

75-07

75-11 75-14 75-12

7516 75-15 75-16

75-13 75-11 75-21 75-18 75-11 75-19 75-17

75-20
75-26 75-27 75-22

75-35 75-32
75-25

75-36 75-24 75-31

75-34 75-30 75-28

75-23

75-34 75-31 75-34

75-33 75-10

75-29 75-33

76-03 76-01 75-37

76-02

76-04 76-03 75-10 65-02

75-02 65-01

65-06 65-04

75-03

75-04 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-11

75-09 75-06

75-07

75-11 75-14 75-12

7516 75-15 75-16

75-13 75-11 75-21 75-18 75-11 75-19 75-17

75-20
75-26 75-27 75-22

75-35 75-32 75-25

75-36 75-24 75-31

75-34 75-30 75-28

75-23

75-34 75-31 75-34

75-33 75-10

75-29 75-33

76-03 76-01 75-37

76-02

76-04 76-03 75-10 65-02

75-02 65-01

65-06 65-04

75-03

75-04 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-11

75-09 75-06

75-07

75-11 75-14 75-12

7516 75-15 75-16

75-13 75-11 75-21 75-18 75-11 75-19 75-17

75-20
75-26 75-27 75-22

75-35 75-32 75-25

75-36 75-24 75-31

75-34 75-30 75-28

75-23

75-34 75-31 75-34

75-33 75-10

75-29 75-33

76-03 76-01 75-37

76-02

76-04 76-03 75-10 65-02

75-02 65-01

65-06 65-04

75-03

75-04 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-11

75-09 75-06

75-07

75-11 75-14 75-12

7516 75-15 75-16

75-13 75-11 75-21 75-18 75-11 75-19 75-17

75-20
75-26 75-27 75-22

75-35 75-32

75-25

75-36 75-24 75-31

75-34 75-30 75-28

75-23

75-34 75-31 75-34

75-33 75-10

75-29 75-33

76-03 76-01 75-37

76-02

76-04 76-03 75-10 65-02

75-02 65-01

65-06 65-04

75-03

75-04 75-01 65-03

75-01 65-05

75-01 75-08 75-04

75-05 75-11

75-09 75-06

75-07

75-11 75-14 75-12

75-16 75-15 75-16

75-13 75-11 75-21 75-18 75-11 75-19 75-17

75-20
75-26 75-27 75-22

75-35 75-32
75-25

75-36 75-31

75-34 75-30 75-28

75-23

75-34 75-31 75-34 75-10

75-29 75-33

76-03 76-01 75-37

76-02

76-04 76-03 T o t a l p h o s p h o r u s i s a m e a s u r e o f o n e o f t h e p r i m a r y n u t r i e n t s t h a t r e g u l a t e s a l g a l a n d m a c r o p h y t e g r o w t h i n l a k e s

. P h o s p h a t e s c a n e n t e r t h e a q u a t i c s y s t e m t h r o u g h a t m o s p h e r i c d e p o s i t i o n , g r o u n d w a t e r p e r c o l a t i o n , a n d t e r r e s t r i a l r u n o f f

. P h o s p h a t e l o a d i n g s c a n b e i n c r e a s e d

w i t h i n p u t s f r o m s e w a g e t r e a t m e n t p l a n t s , i n d u s t r i a l s o u r c e s , a g r i c u l t u r a l a n d r e s i d e n t i a l r u n o f f
, o r f r o m p h o s p h a t e m i n i n g a n d f e r t i l i z e r p r o c e s s i n g a c t i v i t i e s

. H i g h p h o s p h o r u s c o n c e n t r a t i o n s c a n a c c e l e r a t e t h e p r o c e s s o f e u t r o p h i c a t i o n

. T h e h i g h e s t r e g i o n a l p h o s p h o r u s

v a l u e s a r e f o u n d i n s o u t h w e s t F l o r i d a w h e r e p h o s p h a t e s a r e o f t e n n a t u r a l l y h i g h ( e

. g

. , 7 5

- 3 0
, 7 5

- 3 6 )
, a n d t h e l o w e s t r e g i o n a l v a l u e s a r e f o u n d i n s o m e o f t h e u p l a n d s a n d y r i d g e s ( 6 5

- 0 3
, 6 5

- 0 5
, 7 5

- 0 4
, a n d 7 5

- 3 3 )

. T o t a l a l k a l i n i t y m e a s u r e s t h e c o m p o n e n t s i n w a t e r , s u c h a s c a r b o n a t e s , b i c a r b o n a t e s , a n d h y d r o x y l b a s e s t h a t t e n d t o e l e v a t e p H a n d b u f f

e r a g a i n s t i n c r e a s e s i n a c i d i t y

. A l t h o u g h m u c h o f F l o r i d a i s u n d e r l a i n b y l i m e s t o n e , m a n y l a k e s i n t h e s t a t e a r e s i t u a t e d i n o v e r l y i n g s a n d s

a n d a r e s o f t

- w a t e r , a c i d i c l a k e s w i t h l o w a l k a l i n i t y

. L o w a l k a l i n i t y i s f o u n d i n m a n y c l e a r l a k e s o f s o m e o f t h e s a n d y u p l a n d r i d g e r e g i o n s ( e

. g

. , 6 5

- 0 3
, 6 5

- 0 5
, 7 5

- 0 4
, a n d 7 5

- 0 9 )
, a s w e l l a s i n s o m e d a r k w a t e r l a k e s i n l o w l a n d r e g i o n s ( 7 5

- 0 1
, 7 5

- 0 2
, 7 5

- 1 0 )

. H i g h e r a l k a l i n i t y i s g e n e r a l l y f o u n d i n c e n t r a l a n d s o u t h e r n F l o r i d a o r i n l a k e s w i t h g r o u n d w a t e r c o n t a c t s

. H i g h a l k a l i n i t y o c c u r s i n l a k e r e g i o n s w h e r e l i m e s t o n e i s n e a r t h e s u r f a c e ( e

. g

. , 7 5

- 0 6
, 7 5

- 1 2 )
, w h e r e l a k e s a r e l i m e d f o r f i s h p r o d u c t i o n ( 6 5

- 0 1 )
, o r i n u r b a n i z e d r e g i o n s w i t h a c o m b i n a t i o n

o f g r o u n d w a t e r i n f l u e n c e a n d h u m a n d i s t u r b a n c e ( 7 5

- 2 1
, 7 5

- 2 8 )

.

T o t a l n i t r o g e n i s t h e c o m b i n e d m e a s u r e o f n i t r a t e , n i t r i t e , a m m o n i a , a n d o r g a n i c n i t r o g e n f o u n d i n a l a k e

. N i t r o g e n i s

a n i m p o r t a n t n u t r i e n t t o m a n y a q u a t i c o r g a n i s m s , s e r v i n g w i t h p h o s p h o r u s a s t h e n u t r i e n t b a s e f o r p r i m a r y p r o d u c t i v i t y

. N i t r o g e n

- t o

- p h o s p h o r u s r a t i o s a r e g e n e r a l l y l o w f o r F l o r i d a l a k e s

. N i t r o g e n l e v e l s o f l a k e s a r e i n c r e a s e d b y i n p u t s f r o m

s e w a g e t r e a t m e n t p l a n t s , c i t r u s a n d a g r i c u l t u r a l r u n o f f
, o r o t h e r u r b a n a n d r e s i d e n t i a l s o u r c e s

. T h i s c a n l e a d t o a l g a l b l o o m s a n d s u b s e q u e n t r e d u c t i o n s i n d i s s o l v e d o x y g e n

. C h l o r o p h y l l a i s t h e p r e d o m i n a n t f o r m o f p h o t o s y n t h e t i c g r e e n p i g m e n t f o u n d i n p l a n t s

. A s a n i n d i c a t o r o f
p h y t o p l a n k t o n b i o m a s s , i t i s u s e d t o a p p r o x i m a t e a l g a e l e v e l s i n a l a k e

. I t i s c o r r e l a t e d w i t h t o t a l p h o s p h o r u s a n d s e c c h i d e p t h
, a n d h e l p s i n d i c a t e t h e t r o p h i c c o n d i t i o n o f l a k e s

. W h i l e m a n y o f F l o r i d a ' s s h a l l o w l a k e s h a v e l o w c h l o r o p h y l l a l e v e l s , a l a r g e p a r t o f t h e n u t r i e n t p o o l m a y b e u s e d b y t h e l a r g e r a q u a t i c p l a n t s c a l l e d m a c r o p y h y t e s

. C o l o r o r t r u e c o l o r o f a l a k e i s a m e a s u r e o f t h e d i s s o l v e d a n d c o l l o i d a l s u b s t a n c e s i n w a t e r t h a t r e d u c e l i g h t t r a n s m i s s i o n

. I t i s m e a s u r e d i n c o m p a r i s o n t o a s c a l e d s e r i e s o f p l a t i n u m

- c o b a l t u n i t ( p c u ) c o l o r s t a n d a r d s

. T h e d e c r e a s e d l i g h t p e n e t r a t i o n i n h i g h c o l o r o r h u m i c

- s t a i n e d d a r k w a t e r l a k e s c a n r e d u c e p r i m a r y p r o d u c t i v i t y a n d t h e

e x t e n t o f t h e l i t t o r a l z o n e

. T h e s a n d y u p l a n d r i d g e s g e n e r a l l y c o n t a i n t h e l a k e s o f l o w e s t c o l o r , w h i l e m o s t o f t h e d a r k

w a t e r l a k e s a r e f o u n d i n l o w l a n d f l a t w o o d s r e g i o n s o r s w a m p y a r e a s t h a t h a v e p e a t a n d o r g a n i c s o i l s

. S e c c h i d e p t h i s a s i m p l e m e a s u r e o f w a t e r c l a r i t y o r t r a n s p a r e n c y

. I t i s d e t e r m i n e d b y t h e a v e r a g e o f t h e d e p t h s a t

w h i c h a b l a c k a n d w h i t e d i s k d i s a p p e a r s a n d r e a p p e a r s w h e n v i e w e d f r o m t h e w a t e r ' s s u r f a c e

. T h e s e c c h i d e p t h i s d e p e n d e n t u p o n t h e t u r b i d i t y , c o l o r , a n d t o t a l s u s p e n d e d s o l i d s i n t h e w a t e r , a m o n g o t h e r f a c t o r s

. T h e l o w

- c o l o r l a k e s

o f t h e u p l a n d r i d g e s ( 6 5

- 0 3
, 7 5

- 0 4
, 7 5

- 0 9
, 7 5

- 1 5
, 7 5

- 2 0
, a n d 7 5

- 3 3 ) g e n e r a l l y h a v e t h e g r e a t e s t s e c c h i d e p t h s

. T h e p H o f a l a k e i s a m e a s u r e o f i t s h y d r o g e n i o n c o n c e n t r a t i o n o r w h e t h e r i t i s a c i d i c o r b a s i c ( a l k a l i n e )

. M a n y o f F l o r i d a ' s l a k e s a r e a c i d i c a n d h a v e b e e n a c i d i c t h r o u g h o u t t h e i r h i s t o r y , w i t h t h e b i o l o g i c a l c o m m u n i t i e s a d a p t i n g t o t h e s e c o n d i t i o n s

. R e g i o n s o f h i g h p H a r e m o s t l y f o u n d i n c e n t r a l a n d s o u t h e r n F l o r i d a , o r i n t h e n o r t h w h e r e l i m e s t o n e i s n e a r t h e s u r f a c e ( 7 5

- 0 6 ) o r t h e l a k e s a r e l i m e d ( 6 5

- 0 1 )

. 100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 4 65-01

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 17 65-02

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 28 65-03

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 37 65-04

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 7 65-05

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 28 65-06

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 32 75-01

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 4 75-02

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 11 75-03

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 72 75-04

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 5 75-05

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 9 75-06

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 2 75-07

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 46 75-08

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 61 75-09

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 85 75-10

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 51 75-11

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 17 75-12

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 18 75-13

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 17 75-14

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 18 75-15

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 66 75-16

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 8 75-17% of lakes 100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 3 75-18

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 39 75-19

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 15 75-20

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 89 75-21

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 8 75-22

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 32 75-23

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 39 75-24% of lakes 100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 3 75-25

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 1 75-26

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 18 75-27

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 6 75-28

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 44 75-31

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 20 75-32

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 42 75-33% of lakes 100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 27 75-34

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 13 75-35

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 44 75-36

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 1 75-37 100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 18 75-30

100 90 80 70 60 50 40 30 20 10

Total phosphorus ( μ g/l) n = 2 76-03 100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 4 65-01

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 17 65-02

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 28 65-03

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 25 65-04

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 6 65-05

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 21 65-06

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 26 75-01

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 4 75-02

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 9 75-03

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 50 75-04

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 5 75-05

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 6 75-06

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 1 75-07

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 44 75-08

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 57 75-09

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 39 75-10

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 29 75-11

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 16 75-12

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 18 75-13

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 13 75-14

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 14 75-15

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 47 75-16

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 6 75-17% of lakes 100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 3 75-18

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 33 75-19

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 9 75-20

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 40 75-21

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 6 75-22

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 19 75-23

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 20 75-24% of lakes 100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 2 75-25

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 17 75-27

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 2 75-28

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 17 75-30

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 15 75-32

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 35 75-33% of lakes 100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 28 75-34

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 13 75-35

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 17 75-36

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 1 75-37 100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 25 75-31

100 90 80 70 60 50 40 30 20 10

Total alkalinity (mg/l) n = 2 76-03% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<55-910-1415-1920-2930-4950-79>80% of lakes<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40<1.01.0-1.92.0-3.94.0-9.910.0-19.920-40>40% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes% of lakes 

# LAKE REGION CHARACTERISTICS

T h e m a p s b e l o w i l l u s t r a t e s o m e o f t h e r e g i o n a l d i f f

e r e n c e s i n t h e c h a r a c t e r i s t i c s o f F l o r i d a l a k e s

. A n u n d e r s t a n d i n g o f r e g i o n a l d i f f

e r e n c e s i n t h e c u r r e n t s t a t u s o f l a k e s , a s w e l l a s o f p o t e n t i a l o r a t t a i n a b l e c o n d i t i o n s , i s i m p o r t a n t f o r e f f

e c t i v e l a k e m a n a g e m e n t

. T h e m a p s a r e d e r i v e d f r o m m e a n l a k e d a t a f r o m 1 1 3 3 l a k e s , s a m p l e d b e t w e e n 1 9 7 9 a n d 1 9 9 6

. M o s t o f t h e d a t a ( 8 2 % ) a r e f r o m l a k e s s a m p l e d b e t w e e n 1 9 9 0 a n d 1 9 9 6

. T h e d a t a a r e f r o m t h e U n i v e r s i t y o f F l o r i d a ( 5 4 % )
, t h e L a k e w a t c h p r o g r a m ( 3 4 % )
, t h e U

. S

. E P A ' s E a s t e r n L a k e S u r v e y ( 8 % )
, a n d f r o m t h e U

. S

. F o r e s t S e r v i c e ( 4 % )

. L a k e d a t a f r o m t h e F l o r i d a D e p a r t m e n t o f E n v i r o n m e n t a l P r o t e c t i o n , t h e F l o r i d a w a t e r m a n a g e m e n t d i s t r i c t s , a n d o t h e r s o u r c e s w e r e a l s o a s s e s s e d f

o r t h e d e l i n e a t i o n o f t h e l a k e r e g i o n b o u n d a r i e s , b u t a r e n o t i n c l u d e d i n t h e s e c h e m i s t r y m a p s o r h i s t o g r a m s d u e t o d i f f

e r e n c e s i n d e t e c t i o n l i m i t s , s a m p l i n g m e t h o d s , d u p l i c a t i o n o f l a k e s , o r o t h e r q u a l i t y c o n t r o l a n d c o m p a r i s o n e f f

o r t s

. T h e m a p s a r e c o l o r

- c o d e d b y t h e m e d i a n v a l u e f o r e a c h l a k e r e g i o n

. A m e d i a n , o r m i d d l e v a l u e , i s u s e d a s a m e a s u r e o f t h e c e n t r a l t e n d e n c y o f a r e g i o n ' s d a t a b e c a u s e i t i s l e s s s k e w e d b y e x t r e m e v a l u e s t h a n i s t h e m e a n o r a v e r a g e v a l u e

. I n r e g i o n s w h e r e t h e r e w e r e i n s u f f

i c i e n t d a t a ( g e n e r a l l y l e s s t h a n t h r e e l a k e s
s a m p l e d )
, t h e r e g i o n s w e r e n o t c o l o r

- c o d e d u n l e s s t h e r e w a s c o n f i d e n c e t h a t t h e o n e o r t w o l a k e s r e p r e s e n t e d t h e r e g i o n ' s t o t a l p o p u l a t i o n o f l a k e s o r p o n d s

. I n s o m e r e g i o n s , t h e
e x t r a p o l a t i o n o f t h e m e d i a n v a l u e t o t h e e n t i r e r e g i o n c a n g i v e a m i s l e a d i n g v i e w o f t h e s p a t i a l d i s t r i b u t i o n o f t h e a c t u a l l a k e v a l u e s

. H o w e v e r , t h e m a p s d o h e l p p o r t r a y s o m e o f t h e
s t a t e w i d e p a t t e r n s a n d r e g i o n a l t e n d e n c i e s

. T h e h i s t o g r a m s o n t h e p h o s p h o r u s a n d a l k a l i n i t y m a p s i l l u s t r a t e t h e f r e q u e n c y d i s t r i b u t i o n , o r r a n g e o f v a r i a t i o n , o f t h e l a k e v a l u e s i n e a c h

r e g i o n

.