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Table 2 Parameters of colour discrimination ellipses fits for a male Alouatta caraya and a female Alouatta seniculus

From: Uniform trichromacy in Alouatta caraya and Alouatta seniculus: behavioural and genetic colour vision evaluation

Subject

Length (u’v’ unit)

Ratio

Angle (degree)

Male Alouatta caraya

 Ellipse 1

0.022158

1.2608

28.053

 Ellipse 2

0.022844

1.3323

138.134

 Ellipse 3

0.040704

2.7798

116.07

Female Alouatta seniculus

 Ellipse 1

0.043602

1.2659

130.95

 Ellipse 2

0.04284

1.241

101.06

 Ellipse 3

0.048058

1.5154

106.87

  1. Subjects were tested using an adaptation from Goulart et al. [24] colour vision test, for the Alouatta genus. Length = Major axis of the ellipses in u’v’units of CIE 1976 chromaticity diagram units, Ratio = major axis length over minor axis length, Angle = relative angle of the major axis in degrees
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Frontiers in Zoology

ISSN: 1742-9994