Ecological Archives M076-013-A1

Paul C. Hanson, Stephen R. Carpenter, David E. Armstrong, Emily H. Stanley, and Timothy K. Kratz. 2006. Lake dissolved inorganic carbon and dissolved oxygen: changing drivers from days to decades. Ecological Monographs 76:343–363.

Appendix A (Table A1). Standardized normal test statistics from the Mann-Kendall test showing long-term trends in the seven study lakes. See Notes at end of table for more details.


Variable

AL

 

BL

 

CB

 

CL

 

SL

 

TB

 

TL

 


Chl

1

2

3

4

1.39

-1.21

-0.37

0.42

 

 

-0.58

-0.59

0.42

0.14

 

-0.13

1.10

2.85

-0.59

 

 

***

1.63

0.085

-0.48

1.72

 

 

 

*

0.48

0.03

0.31

0.54

 

-1.81

0.65

3.02

2.00

*

 

***

**

-0.36

-1.10

0.25

-1.49

 

DOC

1

2

3

4

-2.01

0.87

1.32

0.49

 

**

-0.27

-0.41

-0.72

-0.27

 

-0.98

2.68

3.29

1.40

 

**

***

2.69

2.39

3.37

2.84

**

**

***

**

-1.02

1.40

2.31

1.48

 

 

**

3.75

3.83

3.90

4.58

***

***

***

***

-0.80

-1.55

0.64

1.86

 

 

 

*

SO4

1

2

3

4

-1.00

-1.86

0.37

-1.13

 

 

*

-1.49

-2.85

-2.37

-2.82

 

***

**

***

-3.57

-4.43

-4.52

-4.71

***

***

***

***

-5.25

-5.78

-5.55

-5.59

***

***

***

***

-3.26

-4.63

-3.95

-4.71

***

***

***

***

-4.41

-4.82

-4.60

-5.39

***

***

***

***

-1.15

-2.06

-1.33

-2.74

 

**

 

**

LL

1

2

3

4

-3.89

-1.43

-1.82

-3.63

 

***

 

*

***

-1.20

-1.61

-0.93

-1.55

 

-1.68

-2.08

-1.17

-1.95

*

**

*

-1.36

-1.44

-0.87

-1.21

 

-0.53

-0.78

-0.39

-0.58

 

-0.60

0.71

0.65

-0.91

 

-0.39

-0.39

-0.32

-0.58

 

T

1

2

3

4

1.27

-0.08

0.82

1.21

 

 

1.04

0.48

0.70

0.70

 

-0.13

-1.83

0.14

1.72

 

*

 

*

0.66

0.14

0.99

1.72

 

 

 

*

-0.30

-0.82

1.04

2.28

 

 

 

**

0.72

-0.87

-0.37

1.21

 

2.29

1.66

0.59

2.40

**

*

 

**

ANC

1

2

3

4

3.08

2.85

2.79

3.24

 

***

***

**

***

1.72

3.13

4.74

4.65

*

***

***

***

-1.33

1.86

0.14

1.27

 

*

3.32

4.26

3.64

3.81

***

***

***

***

1.75

3.47

4.17

4.96

*

***

***

***

1.45

0.25

0.03

-0.14

 

3.80

2.11

4.40

4.09

***

**

***

***

DIC

1

2

3

4

-0.04

2.08

2.31

1.78

 

 

**

**

*

-0.95

3.83

3.90

2.77

 

***

***

**

-3.45

1.86

1.55

-2.92

***

*

 

***

-2.39

1.78

4.36

1.70

**

*

***

*

-1.48

2.61

4.43

4.05

 

**

***

***

-2.46

1.55

-0.19

-2.16

**

 

 

**

0.57

2.46

3.98

3.60

 

**

***

***

DO

1

2

3

4

1.93

1.72

0.82

1.95

 

*

*

 

*

1.30

2.51

1.83

1.55

 

**

*

-1.88

-1.21

-1.04

0.25

*

0.85

1.83

-1.49

0.65

 

*

0.91

2.40

-0.93

2.00

 

**

 

**

-2.72

-1.78

-1.55

-1.10

**

*

0.85

1.27

-1.33

1.66

 

 

 

*

CO2

1

2

3

4

-1.55

0.04

0.19

-1.02

 

 

-1.48

0.27

-1.78

0.04

 

 

*

-3.30

1.86

1.78

-2.69

***

*

*

**

-2.69

0.11

2.77

-1.10

**

 

**

-1.63

1.10

-0.49

1.33

 

-2.39

1.55

-0.19

-2.08

**

 

 

**

-0.80

0.04

1.48

1.02

 

HCO3

1

2

3

4

0.42

2.16

2.39

2.92

 

**

**

***

-0.80

2.84

4.28

2.54

 

***

***

**

-4.43

0.72

-0.34

-1.93

***

 

 

*

0.27

3.60

4.05

3.75

 

***

***

***

-0.87

2.46

4.47

3.67

 

**

***

***

-2.46

1.33

0.49

-1.63

**

0.87

2.61

3.90

3.45

 

**

***

***


   Notes: Columns are lakes. Codes for the seven study lakes in northern Wisconsin are: AL, Allequash Lake; BL, Big Muskellunge Lake; CB, Crystal Bog; CL, Crystal Lake; SL, Sparkling Lake; TB, Trout Bog; TL, Trout Lake. Rows are the four annual quarters for each variable.

† Proxy variables, which represent lake physical, chemical, and biological processes are: Chl, chlorophyll a; DOC, dissolved organic carbon; SO4, sulfate; LL, lake level; T, temperature; ANC, acid-neutralizing capacity; CO2, dissolved carbon dioxide; HCO3, DIC-CO2. Response variables are: DIC, dissolved inorganic carbon; DO, dissolved oxygen.

* P < 0.1; ** P < 0.05; *** P < 0.005.



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