Ecological Archives A014-010-A2

Melinda G. Knutson, William B. Richardson, David M. Reineke, Brian R. Gray, Jeffrey R. Parmelee, and Shawn E. Weick. 2004. Agricultural ponds support amphibian populations. Ecological Applications 14:669–684.

Appendix B. Summary statistics for the top predictor variables for agricultural ponds in Houston and Winona Counties, Minnesota, 2000.
   

NATUR

NGRAZ

GRAZE

AGRIC

Kruskall-Wallis
P value

Group

Top Predictors

Min

Med

Mean

Max

Min

Med

Mean

Max

Min

Med

Mean

Max

Min

Med

Mean

Max

Landscape

(ha, m)

FOREST1000

21

131

122

167

19

123

118

204

7

98

99

195

5

67

83

181

 

FOREST2500

181

916

901

1159

309

822

795

1109

214

598

645

1052

293

612

637

1152

 

GRASSLAND 1000

10

53

56

88

23

47

49

74

20

43

48

83

12

43

39

64

 

GRASSLAND 2500

114

304

293

469

197

297

303

441

167

272

288

461

170

296

294

379

 

WET_AREA 500

1.6

4.9B

10.0

42.0

0.0

0.3A

0.5

1.8

0.1

0.4A

0.5

1.6

0.1

0.5A

0.5

0.8

<0.0001

NEAR_WET

11.2

62.6

83.5A

205.2

29.2

321.0

325.6B

628.6

164.9

302.5

377.5B

788.5

32.0

332.7

328.4B

735.2

0.0043

NEAR_FOREST

0.0

0.0

36.8

172.3

0.0

5.4

38.0

278.1

0.0

38.6

62.8

170.7

0.0

24.1

84.8

500.2

 

Pond
Morph.
(m, ha)
Pond

W_DEPTH_MEAN

0.2

0.5

0.5A

1.00

0.7

1.4

1.5B

2.7

0.1

1.3

1.4B

2.8

0.6

1.1

1.1AB

1.7

0.0043

POND_AREA

0.10

0.36

1.01

5.58

0.03

0.12

0.18

0.41

0.04

0.21

0.22

0.65

0.05

0.14

0.23

0.53

0.0330

TREESHRB

0.0

2.0B

4.0

10.0

0.0

1.0B

2.4

10.0

0.0

0.0A

0.0

0.0

0.0

1.0B

1.9

7.0

0.0029

Vegetation
(%, index)

Predators
%, index)

VEG_SUM

0.0

5.5

4.9

9.0

0.0

2.0

2.6

8.0

0.0

0.5

1.0

4.0

0.0

2.0

1.5

3.0

 

FISH (%)

0

100

80B

100

0

0

30AB

100

0

0

10A

100

0

0

0A

0

0.0004§

BCKSMR

0.0

1.0

1.5

6.0

0.0

2.0

2.0

4.0

2.0

3.0

3.1

6.0

0.0

2.5

2.5

4.0

 

WATBEE

0.0

2.0

2.0

5.0

0.0

2.0

1.8

4.0

0.0

1.0

0.9

2.0

0.0

2.0

1.6

3.0

 

AMTRIN

0.0

0.0

0.3

2.0

0.0

0.0

0.4

2.0

0.0

0.0

0.4

2.0

0.0

0.0

0.2

1.0

 

Water Quality

TOTNITR (mg/L)

0.04

0.17

0.25

0.73

0.01

0.20

0.30

1.29

0.08

0.48

1.50

7.18

0.08

0.27

1.76

14.76

 

TOTPHOS (mg/L)

0.6

1.1A

1.5

4.8

0.4

1.2AB

1.5

4.0

1.0

3.2B

4.4

15.0

1.1

1.8AB

3.3

16.7

0.0062

TURB (NTU)

4.2

8.9A

9.8

18.0

2.5

9.5AB

20.4

70.2

8.1

37.2B

42.4

100.0

7.5

16.9AB

26.4

74.6

0.0073

COND µmhos/cm)

257

410B

421

666

66

85A

144

392

112

210AB

303

962

96

133A

258

1269

0.0005

Statistics with different letters were significantly different (alpha = 0.05) from one another.

ANOVA test P value.

§ Fisher’s exact test P value.




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