Banca de DEFESA: MARIANA DA SILVA CAPÍTULO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MARIANA DA SILVA CAPÍTULO
DATA : 31/08/2019
HORA: 09:00
LOCAL: Sala Darwin
TÍTULO:

Influence of color vision on fruit and insect detection in Callithrix jacchus groups in Caatinga

PALAVRAS-CHAVES:

visual polymorphism; frugivory; insectivory; caatinga; common- marmoset.

PÁGINAS: 63
GRANDE ÁREA: Ciências Humanas
ÁREA: Psicologia
RESUMO:

Primates have the ability to be trichromat, but this characteristic is quite variable. While in catarrhine monkeys males and females both have trichromatic vision, in platyrrhine there is color vision polymorphism, with occurrence of trichromat and dichromat females, while males are necessarily dichromat. Trichromacy is thought to be an adaptation to improve detection of ripe fruits and / or young leaves against a background of mature leaves. On the other hand, it has been suggested that dichromat individuals are better at finding camouflaged insects, whereas trichromatmas have the advantage of detecting conspicuous insects. Although there are several studies on color vision focused on visual modeling, experiments on semi-natural conditions and studies on nature, the results are inconsistent. Therefore, in this study we analyze if color vision influences the detection of fruits and insects in groups of Callithrix jacchus in Caatinga. For this, two groups of marmosets were followed from dawn until dusk and recorded the food items consumed. Fruit availability and arthropod abundance in the foraging area of marmoset groups was also evaluated. We used visual modeling to calculate the chromatic contrast (JND) between fruits and insects and their backgrounds for the six color vision phenotypes from field photographs. According to our work, the fruits found in Caatinga can be detected by the brightness and the green-red axis, while the insects can only be detected by the green-red axis, suggesting an advantage of the trichromats in the detection of both. the items. We have found that trichromat phenotypes have superior fruit detection performance as expected. As far as insect detection is concerned, although phenotype 543/562 outperforms, all phenotypes are equally able to detect insects. This is the second work on color vision carried out at Caatinga and the first visual modeling work that includes the two main food item types of the calithrichid diet.

MEMBROS DA BANCA:
Externo à Instituição - ANDRE CARREIRA BRUINJÉ - USP
Presidente - 1476621 - DANIEL MARQUES DE ALMEIDA PESSOA
Interna - 2696495 - RENATA GONCALVES FERREIRA