Microrefuges and the occurrence of thermal specialists: implications for wildlife persistence amidst changing temperatures

Table 4 Rankings and relative support for models that quantify the role of microrefuges in pika occurrence during the period in which green vegetation was available (1 June – 30 September)

Model	K	AIC_c	Δ AIC_c	W_j	E_j
Subsurface microrefuge (magnitude)	2	45.57	0.00	0.75	n/a
Interstitial temperature (variation)	2	48.95	3.38	0.14	5.36
Interstitial temperature (magnitude)	2	51.78	6.22	0.03	25.00
Subsurface microrefuge (variation)	2	52.51	6.94	0.02	37.50
Local habitat - Cos(Aspect)	2	52.89	7.32	0.02	37.50
Surface temperature (variation)	2	52.91	7.34	0.02	37.50
Surface temperature (magnitude)	3	54.23	8.66	0.01	75.00
Local habitat - Slope + Elevation + Cos(Aspect)	4	55.81	10.24	0.00	undefined

Model-selection parameters from competing models used to examine the effects of microrefuges and surface temperatures on American pika (Ochotona princeps) occurrence in western Wyoming, USA, 1 June – 30 September; K, number of parameters in the model; AIC_c, Akaike Information Criterion corrected for small samples; Δ AIC_c, difference for model relative to the smallest AIC_c in the model set; W_j, Akaike weight is the approximate probability in favor of the given model from the set of models considered; E_j represents the weight of evidence in support of a model, compared to the top ranked model (W_jTop/W_ji)

ISSN: 2053-7565