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The fish eye view: are cichlids conspicuous?

Brian E Dalton1, Thomas W Cronin, N Justin Marshall

  • 1Department of Biology, University of Maryland, Baltimore County, MD 21250, USA.

The Journal of Experimental Biology
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Male cichlid fish have more conspicuous colors than females due to sexual selection, though natural selection may favor cryptic female coloration for breeding. This study quanties color differences in nine Lake Malawi species.

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Area of Science:

  • Evolutionary biology
  • Animal coloration
  • Behavioral ecology

Background:

  • Animal coloration results from natural and sexual selection.
  • In Lake Malawi cichlids, sexual selection likely drives male coloration, while natural selection favors cryptic females due to mouthbrooding.

Purpose of the Study:

  • To test the hypothesis that male cichlids exhibit more conspicuous colors than females.
  • To compare the conspicuousness of male and female nuptial colors across nine cichlid species using models of their visual systems.

Main Methods:

  • Modeled cichlid trichromatic color space to assess color conspicuousness.
  • Quantified color conspicuousness using Euclidean distance from backgrounds and other fish colors.
  • Analyzed nuptial colors of nine Lake Malawi cichlid species.

Main Results:

  • In six of nine species, breeding males displayed statistically more conspicuous colors than females.
  • Male colors contrasted strongly with backgrounds and other fish colors, within the habitat's optimal light transmission spectrum.
  • Female colors were sometimes less conspicuous, suggesting cryptic adaptations, but conspicuous females were observed in two species.

Conclusions:

  • Sexual and natural selection differentially shape male and female cichlid coloration, generally favoring conspicuous males and cryptic females.
  • Deviations from this pattern in some species indicate the influence of other selective pressures or sexual conflicts.
  • Cichlid spectral sensitivity influences the visual perception of these color differences.