Synopsis
The midas cichlid, Cichlasoma citrinellum, occurs in the lakes of Nicaragua. In semi-turbid to turbid lakes about 8% of the adults are amelanic, having lost their melanophores at various ages, and are thus yellow through red and sometimes white. The commonest hues are yellow through orange, called gold. Gold morphs ought to be selected against because they are probably conspicuous to predators and they cannot communicate by changing markings. To maintain the polymorphism, gold coloration must have offsetting advantages. Gold morphs dominate normal ones of equal size, and that improves their access to limiting resources. Gold morphs, however, do not seem to be intrinsically more aggressive but rather attain dominance through the effect of their color on their opponents. This gold effect is affected by experience; it is enhanced by sharing the color of the dominant fish in a group, and by being rare. The midas cichlid mates assortatively but imperfectly. Choice of mate is influenced by color of self and of parents and can be constrained by size-color relationship.
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© 1983 Dr W. Junk Publishers, The Hague
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Barlow, G.W. (1983). The benefits of being gold: behavioral consequences of polychromatism in the midas cichlid, Cichlasoma citrinellum . In: Noakes, D.L.G., Lindquist, D.G., Helfman, G.S., Ward, J.A. (eds) Predators and prey in fishes. Developments in environmental biology of fishes, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7296-4_9
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