Ecological Archives E089-035-A3

Paul R. Gagnon and William J. Platt. 2008. Multiple disturbances accelerate clonal growth in a potentially monodominant bamboo. Ecology 89:612–618.

Appendix C. Results of mixed-model ANCOVA of finite rates of increase for populations of ramets over the three-year study, using orthogonal individual degree-of-freedom contrasts.

TABLE C1. Result of mixed-model ANCOVA of finite rates of increase (i.e., lambda [lambda], defined as Nt+1/Nt where N = culm density, t = census 1 and t+1 = census 3) for populations of ramets over the three-year study, using orthogonal individual degree-of-freedom contrasts. Results are adjusted for the significant covariate (Ramet density at census 1). Ndf = numerator degrees of freedom; Ddf = denominator degrees of freedom based on Kenward-Roger approximation.


Source of variation:

Ndf

Ddf

F

P

Census 3 fixed effects onlambda

       

   Stand type

2

23.5

22.40

<.0001

   Fire

1

23.7

1.89

0.1825

   Stand type × fire

2

23.7

3.41

0.0500

   Ramet density at census 1 (covariate)

1

111

8.92

0.0035

Individual degree of freedom contrasts

       

   Blowdown × canopy

1

24.4

39.61

<.0001

   Discrete canopy × continuous canopy

1

22.7

5.29

0.0310

   (Blowdown × canopy) × (burned × unburned)

1

24.3

6.76

0.0156

   (Discrete canopy × continuous) × (burned × unburned)

1

23.1

0.05

0.8303


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