Banca de DEFESA: STELLA GUEDES CALAZANS LIMA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : STELLA GUEDES CALAZANS LIMA
DATA : 22/11/2016
HORA: 09:00
LOCAL: Sala de Aula da Pós-Graduação em Psicobiologia
TÍTULO:

Acustic behavior and social complexity in Cavioidea

PALAVRAS-CHAVES:

Caviomorph, Hystricognathi, Bioacoustic, Vocal Complexity, Communication

PÁGINAS: 142
GRANDE ÁREA: Ciências Humanas
ÁREA: Psicologia
SUBÁREA: Psicologia Comparativa
ESPECIALIDADE: Estudos Naturalísticos do Comportamento Animal
RESUMO:

The relationship between acoustic communication and sociality has been the focus of several studies concerning the hypothesis of social complexity for communication. This hypothesis predicts that animals that live in complex social groups, requires a more diverse repertoire to produce more information. However, there is a lack of studies that explain the causal directionality between social and vocal complexity in mammals, and that identify which factors -environmental and/or social - may have co-evolved and contributed to the complexity of mammalian communication. In this context, the comparative study between caviomorph species that differ in their social and ecological systems, may contribute to the understanding of this system. The caviomorph rodents are comprised of a wide diversity of species, which present variation in the size and composition of social groups, in the types of mating systems, in the types of social systems, in the types of habitat and size of acoustic repertoires. These characteristics of this taxon are available in the literature for ten species of caviomorph. In this study, we aim to provide data about the acoustic repertoire of Cuniculus Paca and Dasyprocta leporina species as well as explore the relationship between social and vocal complexity in caviomorphs. Thus, the first chapter of this work describes the vocal repertoire of spotted pacas kept in captivity. The results revealed seven types of vocalizations, mainly emitted in agonistic contexts, possibly related to territorial defense. We also found sex differences in a call that seems to function as a sexual recognition mechanism. In addition, we found an unexpected degree of vocal complexity for this solitary species. The second chapter describes the acoustic repertoire of red-rumped agoutis, consisting of 10 types of calls, mainly associated with agonistic and defense contexts during the feeding period. Sexual differences were identified in several vocalizations: “coo”, “groan”, “creak-squeak”, “grunt”, bark and “snarl”, which generally have lower frequencies for males. We also found gradations, transitions and combinations of sounds that add complexity to the acoustic repertoire of red-rumped agouti, as expected for species that live in pairs or form small family groups. The third chapter tests the correlation between social and vocal complexity among ten species of caviomorphs. The results confirmed that there is a positive relationship between the complexity in the social system of the species (group composition, size of offspring, social system and mating system) and the size of caviomorph friendly vocal repertoires. On the other hand, we found no relationship among vocal complexity and ecological and morphological characteristics of the species studied here. This study corroborates with social complexity hypothesis for communication in caviomorph and contributed to identify which social and non-social factors are related to vocal complexity in these species.

MEMBROS DA BANCA:
Interno - 1149552 - ARRILTON ARAUJO DE SOUZA
Externo à Instituição - CARLOS BARROS DE ARAÚJO - UFPB
Interno - 6346130 - MARIA BERNARDETE CORDEIRO DE SOUSA
Interno - 1863735 - RENATA SANTORO DE SOUSA LIMA MOBLEY
Externo à Instituição - ROGÉRIO GRASSETTO TEIXEIRA DA CUNHA - UNIFAL-MG