Banca de QUALIFICAÇÃO: DIOGO JACKSON DE AQUINO SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : DIOGO JACKSON DE AQUINO SILVA
DATA : 05/03/2018
HORA: 09:00
LOCAL: Sala da PPG em Psicobiologia
TÍTULO:

Importance of the coloration of Minuca rapax: reproduction versus predation

PALAVRAS-CHAVES:

Fiddler crabs, ultraviolet, mate choice, camouflage, trade-off.

PÁGINAS: 17
GRANDE ÁREA: Ciências Humanas
ÁREA: Psicologia
RESUMO:

Conspicuous signs can evolve to increase the efficiency of communication, but possess a cost associated with exposure to predation. In the fiddler crab Minuca rapax, the hypertrophied cheliped of males presents reflection of ultraviolet light that can be a conspicuous and honest signal used in the intraspecific communication of these animals. However, predators can also detect this signal. Thereby, the present work intends to analyze the influence of the coloration of the males, mainly of the ultraviolet reflection, on the relationships of intrasexual competition, intersexual selection and predation. Individuals of Minuca rapax will be captured, tagged and measured in terms of their size and color during low tide. For the experiments of agonistic and sexual behavior, and autotomized chelipeds, three replicates will be performed. For each replica will use 20 males with similar size, 10 of these will be male of high quality of color (reflect more ultraviolet light) and the other 10 with low quality, both groups will be placed in a fenced arena built in the own habitat in semi-captivity. Thus, three experiments will be carried out in sequence: (i) competition between males, which will consist of filming the interaction of the males in the enclosure; (ii) mate choice and competition, which will consist of adding females to male enclosures and filming the agonistic and sexual interactions; (iii) comparison of color and size of autotomized and regenerated chelipeds. The experiment of predation risk will take place in another enclosure; it consists in forming three groups of males with 20 individuals each with different intensities of ultraviolet light, which will be analyzed periodically regarding natural predation. As a result of these interactions, it is expected that animals that reflect more ultraviolet light will be chosen more by females and be better competitors than males that reflect less ultraviolet. In addition, we expect that regenerated chelipeds will reflect less ultraviolet when compared to the original autotomized chelipeds. In contrast, animals with higher ultraviolet reflection tend to be more predated when compared to those with less ultraviolet reflection. Therefore, it is expected that ultraviolet light is a determining factor for the sexual selection of these animals, bringing a possible cost associated with the risk of predation.

MEMBROS DA BANCA:
Interno - 1644341 - ANA CAROLINA LUCHIARI
Presidente - 1476621 - DANIEL MARQUES DE ALMEIDA PESSOA