. Author manuscript; available in PMC: 2019 Aug 30.

Published in final edited form as: Rapid Commun Mass Spectrom. 2018 Aug 30;32(16):1425–1438. doi: 10.1002/rcm.8168

Table 5.

Results from linear mixed effects model selection for Experiment 2, identifying variables that influence δ¹⁵N and δ¹³C values in layers of skin of 28 sperm whales. Table shows the top five models for each isotope ratio. “DOY” refers to the day of the year variable, which is also included in the model as a quadratic term, and is allowed to interact with the layer variable. The symbol “+” indicates the factor variable is included in the model. Weights refer to AICc weights from each model.

	Model Rank	DOY²	Layer	DOY* Layer	df	logLik	ΔAICc	Weight

δ¹⁵N	1	+	+		8	−36.05	0	0.81
	2		+		6	−40.36	3.81	0.12
	3	+			6	−41.47	6.02	0.04
	4	+	+	+	12	−34.35	7.09	0.02
	5				4	−45.79	10.10	0.01

δ¹³C	1	+	+		8	−37.21	0	0.75
	2		+		6	−40.76	2.28	0.24
	3	+	+	+	12	−36.52	9.10	0.01
	4	+			6	−60.28	41.32	0
	5				4	−63.84	43.85	0