Ecological Archives E093-032-A5

David L. Kimbro. 2012. Tidal regime dictates the cascading consumptive and nonconsumptive effects of multiple predators on a marsh plant. Ecology 93:334–344.

Appendix E (TABLE E1). Model selection summary for analysis of change in cordgrass biomass over experiment (i) and size of indirect predator effect on cordgrass (ii).  Fitted parameters include (a) intercept of 1, (b) tidal regime, (c) identity of predator and its cue, as well as (d) presence of any predator or predator cue.  AIC difference (Δi) is the difference between the AICc of model i and the lowest AICc observed.  Akaike weight (wi) is calculated as the model likelihood, exp(-Δi / 2), normalized by the sum of all model likelihoods; values close to 1 indicate greater confidence in the selection of a model.

(i) Change in biomass
of cordgrass
df i) wi
a 3 22.6 < 0.001
b 4 16.3 < 0.001
c 10 16.3 < 0.001
b + c 11 10.7    0.005
b × c 18 0.0    0.995
(ii) Size of indirect
predator effect
     
 a 3 7.8 0.01
b 4 0.0 0.54
c 8 9.2 0.005
b + c 9 2.3 0.17
b × c 14 1.4 0.27

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