Color polymorphism and intrasexual competition in assemblages of cichlid fish
نویسندگان
چکیده
منابع مشابه
Intrasexual competition among females and the stabilization of a conspicuous colour polymorphism in a Lake Victoria cichlid fish.
The maintenance of colour polymorphisms within populations has been a long-standing interest in evolutionary ecology. African cichlid fish contain some of the most striking known cases of this phenomenon. Intrasexual selection can be negative frequency dependent when males bias aggression towards phenotypically similar rivals, stabilizing male colour polymorphisms. We propose that where females...
متن کاملPigments of a color polymorphism in a cichlid fish.
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 ...
متن کاملKnow thine enemy: intrasexual selection and sympatric speciation in Lake Victoria cichlid fish
It has been suggested that sympatric speciation can be driven by sexual selection on male mating traits alone. However, a fundamental problem for this process is the lack of ecological differentiation that would stabilize co-existence of incipient species through frequency-dependent selection. Such selection can also occur if male aggression is primarily directed towards similar rather than tow...
متن کاملA role for male bower size as an intrasexual signal in a Lake Malawi cichlid fish
Disruptive sexual selection through female mate choice has been proposed as a key mechanism driving the evolution of haplochromine cichlid fish diversity. Here we investigated if male secondary sexual traits employed by females in direct mate choice have an additional function in male competition. We conducted a field experiment on aggression among males of a lekking Lake Malawi cichlid species...
متن کاملFrequency-dependent social dominance in a color polymorphic cichlid fish.
A mechanism commonly suggested to explain the persistence of color polymorphisms in animals is negative frequency-dependent selection. It could result from a social dominance advantage to rare morphs. We tested for this in males of red and blue color morphs of the Lake Victoria cichlid, Pundamilia. Earlier work has shown that males preferentially attack the males of their own morph, while red m...
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ژورنال
عنوان ژورنال: Behavioral Ecology
سال: 2008
ISSN: 1045-2249,1465-7279
DOI: 10.1093/beheco/arn125