Ecological Archives E087-042-A3

Andrew H. Altieri and Jon D. Witman. 2006. Local extinction of a foundation species in a hypoxic estuary: integrating individuals to ecosystem. Ecology 87:717–730.

Appendix C. An ANOVA table comparing densities of predators at mussel and non-mussel sites.

TABLE C1. Results of ANOVA testing the hypothesis that predator density did not differ between mussel and non-mussel sites in the spring survey.  The factor site was nested within the factor of mussel presence since sites were treated as replicates of either mussel or non-mussel sites.

Species

Source

df

F

P

Asterias

Mussels present

1

216.63

< 0.0001

Site (mussels present)

14

9.63

< 0.0001

Busycon

Mussels present

1

0.32

0.5734

Site (mussels present)

14

2.24

0.0154

Cancer

Mussels present

1

12.24

0.0009

Site (mussels present)

14

34.20

< 0.0001

Carcinus

Mussels present

1

0.6317

0.4297

Site (mussels present)

14

5.4351

< 0.0001

Drills

Mussels present

1

13.5650

0.0005

Site (mussels present)

14

13.0816

< 0.0001

Dyspanopeus

Mussels present

1

0.3342

0.5652

Site (mussels present)

14

46.0380

< 0.0001

Libinia

Mussels present

1

6.1742

0.0156

Site (mussels present)

14

11.8755

< 0.0001



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