Table 1 Comparisons of AIC values of models to explain variation in bill size in relation to change in summer and winter extremes over the past 20 years, with and without accounting for change in primary cover

From: Australian birds track climate warming over decades via shifts in bill morphology

  

Model structure

AICc

ΔAICc

Summer extreme models

m1

Δdays ≥ 35 °C + Tmax + Δdays ≥ 35 °C:Tmax + rainfall + Δdays≥35°C:rainfall

−4229.946

 

m3

Δdays ≥35 °C + Tmax + Δdays≥35 °C:Tmax + rainfall + Δdays ≥ 35 °C:rainfall +Δprimary cover + Δdays ≥ 35 °C:Δprimary cover

−4224.520

5.426

m5

FG*Δdays ≥ 35 °C* Tmax + FG*Δdays ≥ 35 °C* rainfall

−4224.489

5.457

  

−4202.702

 

Winter extreme models

m2

Δdays < 5 °C + Tmin + Δdays < 5 °C:Tmin + rainfall + Δdays < 5 °C: rainfall

m4

Δdays < 5 °C + Tmin + Δdays < 5 °C:Tmin + rainfall + Δdays < 5 °C: rainfall + Δprimary cover + Δdays < 5 °C:Δprimary cover

−4204.603

−1.901

  1. The AICc values of models with three-way interactions between climate interactions and feeding guild (FG) are also shown. Model with the lowest AICc values (or within 2 AIC of lowest value) among the respective sets of summer and winter models are highlighted in bold. The delta AICc values are also shown. All models controlled for body size, feeding guild, IBRA region, year,season of collection and for phylogeny. (Tmax Mean maximum summer temperature, Tmin Mean minimum winter temperature, rainfall summer or winter precipitation). AICc values for m1 and m4, without controling for phylogeny, are −4232.514 and −4206.446 respectively.
Back to article page