Ecological Archives E088-056-A1

Christine R. Whitcraft and Lisa A. Levin. 2007. Regulation of benthic algal and animal communities by salt marsh plants: impact of shading. Ecology 88:904–917.

Appendix A. A table of macrofaunal density at two sampling points and in two habitats.

TABLE A1. Comparison of responses to unshaded, shaded, and control treatments by the macrofaunal community (density) after three months (August) and six months (November) in (A) S. foliosa and (B) S. virginica habitats. Mean density of organisms per core (18.1 cm2) ( +1 SE) are reported. Superscripted letters indicate a posteriori differences among treatments (P > 0.05).

 

Three months

Six months

Species

Unshaded

Shaded

Control

χ22

P value

Unshaded

Shaded

Control

χ22

P value

A) Spartina foliosa                    

Assiminea californica

0.13 (0.13)

0.50 (0.27)

0.50 (0.33)

1.31

0.519

0

0

0.13 (0.13)

2.00

0.368

Capitella spp . complex

0a

0a

1.38 (0.98)b

6.54

0.038

0.88 (0.44)

0.63 (0.26)

1,88 (1.74)

0.55

0.759

Capitellidae sp #2

0.13 (0.13)

0.75 (0.49)

0.50 (0.10)

2.15

0.342

n/a

       

Ceratapogonidae larvae sp. 1

2.38 (1.34)

2.13 (0.93)

5.00 (3.84)

0.09

0.954

0.13 (0.13)

0

0.25 (0.16)

5.38

0.068

Coleoptera sp. 1

0

0.38 (0.18)

0.13 (0.13)

4.03

0.138

0.38 (0.18)a

0b

0b

6.57

0.037

Chironomid larvae sp 1

0

0

0

   

0

0

0.13 (0.13)

2.00

0.368

Corophium spp .

0.13 (0.13)

6.0 (3.53)

3.88 (2.38)

2.15

0.342

0.38 (0.18)

6.63 (4.37)

23.38 (12.76)

4.76

0.093

Dolicopodidae larvae sp 1

0.75 (0.53)

0.25 (0.16)

0.25 (0.16)

0.10

0.949

1.63 (0.68)a

0.88 (0.40)ab

0.25 (0.16b

8.15

0.017

Enchytraidae sp 1

16.75 (9.84)a

70.5 (23.88)b

29.38(10.40)ab

7.93

0.019

49.88 (13.99)

74.75 (21.80)

75.88 (24.35)

0.52

0.771

Ephydra larvae sp 1

0.13 (0.13)

1.13 (0.61)

0.75 (0.37)

3.32

0.190

0

1.25 (0.53)

0.63 (0.63)

7.75

0.021

Fabricia sabella

0.13 (0.13)

4.62 (1.74)

4.0 (2.81)

5.36

0.068

0

3.63 (3.21)

3.38 (3.38)

5.09

0.079

Ligia occidentalis

0

0

0.13 (0.13)

2.00

0.368

0.13 (0.13)

0

0.13 (0.13)

1.05

0.593

Mite 1

7.38 (4.12)

10.63 (2.70)

6.23 (3.10)

1.78

0.411

0

0

0.50 (0.50)

2.00

0.368

Mite 2

0.13 (0.13)

0.25 (0.16)

0.50 (0.27)

1.49

0.475

5.88 (0.13)

5.63 (0.16)

5.38 (0.27)

0.02

0.992

Muscidae larvae sp 1

1.88 (0.64)

2.25 (0.59)

2.38 (1.24)

0.63

0.731

22.75 (8.20)

1.75 (0.59)

1.25 (0.73)

4.63

0.099

Nemertea sp 1

0

0

0

   

0

0

0.13 (0.13)

3.86

0.145

Traskorchestia traskiana

0.63 (0.63)

1.38 (0.46)

0.75 (0.53)

3.11

0.211

0

0.38 (0.38)

0

6.02

0.049

Platyhelminthes sp 1

0

0

0

   

0.25 (0.25)

0

0.63 (0.32)

4.18

0.124

Poduridae sp 1

0

0

1.38 (1.38)

2.00

0.368

0

0

0

   

Polydora cornuta

0.63 (0.63)

1.38 (0.94)

0

2.18

0.336

1.00 (0.65)

2.75 (2.75)

7.75 (3.17)

4.69

0.096

Paranais littoralis

0

0

0

   

31.13 (15.92)

26.50 (11.53)

42.25 (16.83)

0.62

0.732

Polydora nuchalis

0.13 (0.13)

2.75 (1.82)

1.38 (0.78)

2.00

0.368

4.63 (3.43)

5.25 (2.99)

0.5 (0.5)

1.60

0.449

Psychodidae sp 1

0.25 (0.25)

0.25 (0.25)

0

1.05

0.593

2.00 (0.53)a

0.88 (0.48)ab

0.13 (0.13)b

8.15

0.017

Spionidae sp 1

1.63 (0.98)

0.63 (0.42)

0.25 (0.16)

1.72

0.424

0

0.25 (0.25)

0

2.00

0.368

Staphylinidae sp 1
(larvae and adults)

1.00 (0.50)

0

0.13 (0.13)

6.58

0.037

0

0

0

   

Tubificidae sp 1

1.13 (0.99)a

14.38 (7.21)b

5.63 (1.95)ab

9.00

0.011

1.25 (0.49)

0.13 (0.13)

4.25 (4.11)

4.78

0.092

                     
B) Salicornia virginica                    

Assiminea californica

1.0 (0.87)

4.0 (3.34)

0.25 (0.16)

1.00

0.606

3.25 (1.76)

3.25 (2.02)

2.62 (0.94)

0.74

0.691

Barleeia sp.

0

0.25 (0.25)

0

2

0.368

0

0

0

   

Capitella spp . complex

0

0

0

   

0

0

0.25 (0.25)

2.00

0.368

Ceratapogonidae larvae sp. 1

0

1.38 (1.10)

2.63 (2.63)

3.59

0.166

11.63 (6.78)

14.13 (5.14)

2.62 (0.84)

2.29

0.318

Cincindelidae adult sp. 1

0.5 (0.27)

0.25 (0.25)

0.13 (0.13)

1.81

0.405

0

0

0.25 (0.16)

4.18

0.124

Coleoptera sp. 1

0

0

0

   

0

0

0.13 (0.13)

2.00

0.368

Chironomid larvae sp 1

0

0

0

   

0

0.13 (0.13)

0

2.00

0.368

Dolicopodidae larvae sp 1

0

0

2.0 (1.33)

9.15

0.011

0.75 (0.49)a

2.88 (0.85)b

0.88 (0.30)a

6.77

0.034

Enchytraidae sp 1

14.88 (6.25)

61.63 (19.27)

46.63 (14.51)

4.59

0.100

24.25 (8.96)

29.00 (6.91)

59.13 (23.11)

1.34

0.151

Ephydra larvae sp 1

0

0.13 (0.13)

0.25 (0.25)

1.05

0.592

0.63 (0.42)

1.00 (0.42)

0

4.70

0.095

Ligia occidentalis

0

0

0.25 (0.25)

2.00

0.368

0

0

0

   

Mite 1

0

0

0

   

0.25 (0.16)

0.75 (0.53)

6.50 (5.93)

1.56

0.458

Mite 2

0

2.13 (2.13)

0.13 (0.13)

1.05

0.592

0

0.13 (0.13)

0.50 (0.50)

1.05

0.592

Muscidae larvae sp 1

1.88 (1.04)

0.25 (0.16)

0.50 (0.19)

4.95

0.084

1.13 (0.52)

0.38 (0.26)

0.25 (0.16)

2.28

0.320

Nemertea sp 1

0

0.13 (0.13)

0.50 (0.50)

1.05

0.592

0.13 (0.13)

0

0

2.00

0.368

Neanthes succinea

0

0.13 (0.13)

0

2

0.368

0

1.00 (1.00)

1.50 (1.50)

1.05

0.592

Oniscid isopod sp 1

0

0.25 (0.25)

0.38 (0.26)

2.01

0.351

0a

0a

0.88 (0.50)b

6.55

0.037

Traskorchestia traskiana

0

1.63 (1.21)

1.00 (0.60)

5.57

0.062

1.25 (1.00)

1.25 (0.59)

0.88 (0.23)

1.57

0.456

Platyhelminthes sp 1

3.88 (3.59)

2.00 (0.78)

0.88 (0.48)

1.71

0.426

0.88 (0.64)

3.63 (2.05)

0

3.78

0.151

Paranais littoralis

0

0

0

   

0.25 (0.16)

1.88 (1.61)

0.13 (0.13)

0.67

0.717

Polydora nuchalis

0.38 (0.26)

0.88 (0.61)

0.75 (0.75)

0.87

0.646

0.50 (0.50)

2.38 (1.50)

0.63 (0.63)

2.15

0.341

Psychodidae sp 1

0

0

0

   

0

0.25 (0.25)

0

2.00

0.368

Staphylinidae sp 1
(larvae and adults)

0.13 (0.13)

0.25 (0.16)

0.25 (0.16)

0.48

0.785

0.50 (0.38)

0.63 (0.63)

0.25 (0.25)

0.45

0.799

Stratiomyidae larvae sp 1

0

0.25 (0.25)

0

2.00

0.368

0.88 (0.52)

2.63 (2.35)

0.25 (0.16)

0.53

0.767

Tubificidae sp 1

0

0

0

   

0

0

0.13 (0.13)

2.00

0.368



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