Table 1.

Model parameters and likelihood ratio tests for colour vision analyses.

Behaviour	Test model relative to null model	Primate Species Effecta	Colour Vision Effectb	Fruit Conspicuity Effectc	Fruit Conspicuity × Colour Vision Interactiond
Sniffing	χ22 = 68.14***	Alouatta: −1.17***	0.49*	n.s.	1.28***
		Cebus: −1.32***			conspicuous: 0.49*
					cryptic: 1.78***
Manual Touch	χ22 = 21.95***	Alouatta: −1.68***	n.s.	n.s.	−0.29***
		Cebus: 0.79***			conspicuous: n.s.
					cryptic: −0.34***
Bite and Reject	χ22 = 28.30***	Alouatta: 1.33***	0.5*	n.s.	0.99**
		Cebus: 0.90***			conspicuous: 0.5*
					cryptic: 1.5***
Acceptance	χ22 = 105.74***	Alouatta: 0.11**	n.s.	n.s.	−0.63***
		Cebus: n.s.			conspicuous: n.s.
					cryptic: −0.60***

^aModel estimate for Alouatta and Cebus relative to Ateles.

^bModel estimate for dichromats relative to trichromats.

^cModel estimate for cryptic relative to conspicuous fruits.

^dInteraction effect in model, with post-hoc pairwise contrasts depicting effects of dichromats relative to trichromats for conspicuous and cryptic fruits.

Significance: p > 0.05 (n.s.), <0.05 (^*), <0.01 (^**), <0.001 (^***).