Table 1. Trophic enrichment factor (TEF) values for carbon and nitrogen isotopes in plasma and red cells of little penguins.

Stable isotope	Blood tissue	TEF	SD	t value	p value
δ15 N	Plasma	4.05	0.95	17.48	<0.001
	Red cells	2.73	0.49	10.23	<0.001
δ13 C	Plasma	−1.91	1.49	−5.47	<0.001
	Red cells	−0.13	0.98	−0.33	0.74

The mean difference between prey and consumer values (TEF) in the linear model output are in comparison with stable isotope values of sardine muscle tissue. SD = standard deviation.