Table 1 Final best-fit models for each species.

From: Analyzing a phenological anomaly in Yucca of the southwestern United States

Term

Y. brevifolia

Y. schidigera

N

1084

1378

Intercept

− 4.28 ± 0.48**

− 2.46 ± 0.25**

GDD

− 3.25 ± 0.55**

− 0.66 ± 0.27*

Average precipitation

0.19 ± 0.49

1.48 ± 0.20**

Poly1 (daylength)

− 4.10 ± 15.4

59.3 ± 11.4**

Poly2 (daylength)

− 73.7 ± 20.5**

− 70.9 ± 10.8**

GDD: average precipitation

− 0.04 ± 0.61

1.75 ± 0.30**

GDD:poly1 (daylength)

− 3.60 ± 17.7

19.0 ± 11.3

GDD:poly2 (daylength)

− 32.3 ± 23.3

3.32 ± 12.5

Average precipitation:poly1 (daylength)

− 25.3 ± 16.5

− 13.8 ± 9.34

Average precipitation:poly2 (daylength)

− 81.0 ± 23.6**

5.25 ± 11.5

GDD: average precipitation: poly1 (daylength)

− 44.2 ± 21.5*

− 63.1 ± 12.3**

GDD: average precipitation: poly2 (daylength)

− 63.5 ± 28.8*

44.7 ± 16.3**

ΔAIC

16.6

4.48

R2

0.41

0.39

  1. Occurrence records with incomplete climate data were filtered from the datasets used to fit these models. The best model includes a three-way interaction between growing degree days, precipitation, and photoperiod. A star is used to denote p < 0.05 and a double star indicates p < 0.01.
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