Photopic adaptations to a changing environment in two Lake Victoria cichlids
نویسندگان
چکیده
منابع مشابه
Two new species of zooplanktivorous haplochromine cichlids from Lake Victoria, Tanzania
Two new species of zooplanktivorous haplochromine cichlids from Lake Victoria, Tanzania, are described and illustrated. These species closely resemble each other. Their affinities to other zooplanktivorous haplochromines from Lake Victoria are discussed. Haplochromis argens sp. n., which featured under nicknames (mainly Haplochromis "argens") in more than 50 papers, was caught both in the Mwanz...
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Many fish species adapt to hypoxia by reducing their metabolic rate and increasing hemoglobin-oxygen (Hb-O(2)) affinity. Pilot studies with young broods of cichlids showed that the young could survive severe hypoxia in contrast with the adults. It was therefore hypothesized that early exposure results in improved oxygen transport. This hypothesis was tested using split brood experiments. Broods...
متن کاملA pharyngeal jaw evolutionary innovation facilitated extinction in Lake Victoria cichlids.
Evolutionary innovations, traits that give species access to previously unoccupied niches, may promote speciation and adaptive radiation. Here, we show that such innovations can also result in competitive inferiority and extinction. We present evidence that the modified pharyngeal jaws of cichlid fishes and several marine fish lineages, a classic example of evolutionary innovation, are not univ...
متن کاملColour vision and speciation in Lake Victoria cichlids of the genus Pundamilia.
Lake Victoria cichlids are one of the most speciose groups of vertebrates. Selection on coloration is likely playing an important role in their rapid speciation. To test the hypothesis that sensory biases could explain species differences in mating preferences and nuptial coloration, we studied seven populations of four closely related species of the genus Pundamilia that differ in visual envir...
متن کاملFast adaptive responses in the oral jaw of Lake Victoria cichlids.
Rapid morphological changes in response to fluctuating natural environments are a common phenomenon in species that undergo adaptive radiation. The dramatic ecological changes in Lake Victoria provide a unique opportunity to study environmental effects on cichlid morphology. This study shows how four haplochromine cichlids adapted their premaxilla to a changed diet over the past 30 years. Direc...
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ژورنال
عنوان ژورنال: Biological Journal of the Linnean Society
سال: 2012
ISSN: 0024-4066
DOI: 10.1111/j.1095-8312.2012.01859.x