Detection of fruit by theCerrado's marmoset (Callithrix penicillata): modeling color signals for different background scenarios and ambient light intensities
| Autor: | Daniel M.A. Pessoa, Eduardo Sosti Perini, Valdir Filgueiras Pessoa |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Light
genetic structures Physiology Color vision Overdominance Discrimination Psychological biology.animal Genetics medicine Animals Molecular Biology Ecology Evolution Behavior and Systematics Appetitive Behavior Callithrix penicillata Color Vision biology Ecology Trichromacy Marmoset Callithrix medicine.disease biology.organism_classification Plant Leaves Light intensity Phenotype Evolutionary biology Fruit Visual Perception Animal Science and Zoology Dichromacy Brazil |
| Zdroj: | Journal of Experimental Zoology Part A: Ecological Genetics and Physiology. :289-302 |
| ISSN: | 1932-5231 1932-5223 |
| DOI: | 10.1002/jez.531 |
| Popis: | Among placental mammals, only primates have trichromatic color vision, however this is not a uniform condition. Under different genetic status, Old World monkeys have routine trichromacy, while New World monkeys show a visual polymorphism, characterized by obligatory male dichromacy. The ecological role of this genetic difference still remains unclear, but some studies show that dichromats and trichromats appear to have different abilities in detecting colored targets against a background of leaves. The Cerrado's marmoset (Callithrix penicillata) is known to forage in brightly illuminated (savanna-like vegetation) and dimly illuminated (forests) environments, exploiting a high amount of dark fruits. Hence, it seems to be a good model for studying the differential advantages enjoyed by each color vision phenotype under natural conditions. Our aim was to verify how the different phenotypes of Cerrado's marmoset detect components of their diet, evaluating the existence of differential phenotype advantages. Under two different light conditions, visual signals of naturally consumed fruits were modeled against different backgrounds scenarios. Even though dichromats and trichromats appear to be equally suited for tasks involving fruit detection, phenotype differential advantages are observed in this marmoset. In many conditions trichromats are predicted to perform better than dichromats, but under low ambient light dichromats manage to outperform trichromats in some scenarios. Phenotypes that carry widely spaced and longer M/L pigments enjoy the most advantage. These differential performances of trichromatic phenotypes, together with overdominance selection, seem to explain the maintenance of the tri-allelic system found in callitrichids. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text