Ecological Archives E091-053-A2

Stuart Wagenius and Stephanie Pimm Lyon. 2010. Reproduction of Echinacea angustifolia in fragmented prairie is pollen-limited but not pollinator-limited. Ecology 91:733–742.

Appendix B. Analysis of deviance tables.

TABLE B1. Analysis of deviance table for a generalized linear model with binomial response. Explanatory variables are observation day and isolation (distance to third nearest neighbor). The response is bee visitation (yes/no) within 20 minutes. Parameter estimates for the additive model are shown in Fig. 1a.

Explanatory
variables

Model df

Model deviance

Test df

Test deviance

Test P value

offset†

728

865.01

 

 

 

obsday

699

750.14

29

114.86

<0.0001

obsday + log(iso3)

698

746.14

1

4.00

0.05

obsday × log(iso3)

669

718.16

29

27.98

0.52

† Note: all models include log(minutes observed) as a known linear predictor (offset).

TABLE B2. Analysis of deviance table for a generalized linear model with binomial response. Explanatory variables are observation day and population size. The response is bee visitation (yes/no) within 20 minutes. Parameter estimates for the additive model are shown in Fig. 1b.

Explanatory
variables

Model df

Model deviance

Test df

Test deviance

Test P value

offset†

768

899.22

 

 

 

obsday

739

775.10

29

124.12

<0.0001

obsday + log(popSize)

738

772.89

1

2.21

0.14

obsday × log(popSize)

710

740.57

28

32.32

0.26

† Note: all models include log(minutes observed) as a known linear predictor (offset).

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