Ecological Archives E087-166-A5

Eric J. Baack, Nancy C. Emery, and Maureen L. Stanton. 2006. Ecological factors limiting the distribution of Gilia tricolor in a California grassland mosaic. Ecology 87:2736–2745.

Appendix E. Mixed-model analysis of the probability of emergence in the first growing season for transplanted G. tricolor seeds.

Fixed effects for the split-plot model are shown here, although the full model also included transect (nested within boundary type) and its interactions with population zone and removal treatment as random effects. Significance testing is based on restricted maximum likelihood and a binomial error structure. Population zone is a fixed factor with three levels: core population sites, edge sites, and peripheral sites beyond major population boundary. There are two population boundary types: the oak-canopy boundary and the valley bottom boundary. (N = 2816)

Effect

Numerator df

Denominator df

F

P

Population zone

2

11.3

4.09

0.0463

Removal treatment

1

19.4

22.13

0.0001

Population zone × removal treatment

2

19.3

6.82

0.0058

Boundary type

1

7.5

4.21

0.0767

Population zone × boundary type

2

11.3

2.24

0.1520

Removal treatment × boundary type

1

19.4

0.78

0.3893

Zone × removal × boundary type

2

19.3

1.38

0.2757



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