Competition Between Color Morphs of the Midas Cichlid, Cichlasoma citrinellum, in Lake Jiloá, Nicaragua
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Competition between Color Morphs of the Polychromatic Midas Cichlid Cichlasoma citrinellum.
The Midas cichlid, Cichlasoma citrinellum, is a polychromatic fish that occurs in Nicaragua. All of these fish start life as normally colored, cryptic individuals. In some populations a few fish change into conspicuously colored morphs, most frequently gold. When kept in unmixed color groups, golds and normals grow at the same rate; but when they are mixed, growth of the golds becomes faster an...
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i. Cichlasoma citrinellum occurs as gray or gold morphs in lakes in Nicaragua. The gold morph is variable and individuals range from yellow to dark orange. 2. The pigments responsible for the carotenoid coloration are E-carotene and canthaxanthin. The gray morph contains a carotenoid component and also heavy melanin deposits. 3. The carotenoids are dietary in origin, but their distribution and ...
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The growing body of empirical evidence for sympatric speciation has been complemented by recent theoretical treatments that have identified evolutionary conditions conducive to speciation in sympatry. The Neotropical Midas cichlid (Amphilophus citrinellum) fits both of the key characteristics of these models, with strong assortative mating on the basis of a colour polymorphism coupled with trop...
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The feeding performance on soft and hard prey of two morphs of the trophically polymorphic Neotropical cichlid fish, Cichlasoma citrinellum, was investigated in the laboratory. The molariform morphs, specialized to feed on hard prey, are able to crack snail shells that are twice as hard as those cracked by the papilliform morphs. During ecological bottlenecks in food resources this ability shou...
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12 benthic-limnetic axis and most populations are also color-polymorphic. The most comprehensive project focuses on the gold/dark color polymorphism in the Midas cichlid species complex (Amphilophus citrinellus spp.). Using a comparative approach that bases on extensive field collections of Midas cichlids, a substantial degree of ecological differentiation between color morphs is revealed. The ...
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