Species-Specific Relationships between Water Transparency and Male Coloration within and between Two Closely Related Lake Victoria Cichlid Species

Table 2

Coloration metrics.

Name/description	Formula	Reference
	𝐶=√𝐿𝑀^2+𝑀𝑆^2
	𝐿𝑀=𝐵𝑅−𝐵𝐺
	𝑀𝑆=𝐵𝑌−𝐵𝐵
	where:
	𝐵𝐵=∑^474400𝑄(𝜆,𝑥)𝐵
Chroma	𝐵𝐺=∑^549475𝑄(𝜆,𝑥)𝐵	[35]
A measure of the “purity” or saturation of a colour; a function of how rapidly intensity changes with wavelength	𝐵𝑌=∑^624550𝑄(𝜆,𝑥)𝐵
	𝐵𝑅=∑^700625𝑄(𝜆,𝑥)𝐵,
	𝐵=∑^700400𝑄(𝜆,𝑥)
𝜆𝑃50
Wavelength that divides the spectrum in two parts with equal spectral energy (i.e., the median of the cumulative distribution between 400–700 nm)	^𝜆𝑃∑^50400=∑^700𝜆𝑃50	[33, 34]