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Doctoral Thesis
DOI
https://doi.org/10.11606/T.47.2018.tde-17072018-174350
Document
Author
Full name
Muriele Lobato Brito
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Silva, Maria Luisa da (President)
Costa, Marcelo Fernandes da
Lima, Silene Maria de Araújo
Ranvaud, Ronald Dennis Paul Kenneth Clive
Santos, Carlos David da Silva Oliveira dos
Title in Portuguese
Identificação neuroanatômica de áreas cerebrais relacionadas à produção do canto em uma espécie de pássaro Suboscine da Amazônia (Myiozetetes cayanensis)
Keywords in Portuguese
CTB
NXIIts
Producao do canto
Sistema de controle do canto
Suboscines
Abstract in Portuguese
A comunidade cientifica, ao longo dos anos, comprovou aprendizagem vocal em tres ordens de aves (papagaios, beija-flores e passeriformes oscines). Contudo, mais recentemente, estudos feitos em tres especies de Suboscines, Sayornis Phoebe, Procnias tricarunculata e Chiroxiphia linearis revelaram a existencia de um sistema rudimentar do canto e/ou extensivas variacoes vocais quantitativas e qualitativas entre as populacoes reprodutivas, sugerindo que estas especies sao capazes de aprender o seu canto. Esta evidencia incita a investigacao de outras especies de passaros Suboscines, visto que a distincao entre passaros aprendizes e nao-aprendizes vocais nao e tao obvia quanto se pensava. Uma especie de passaro Suboscines amazonica, Myiozetetes cayanensis, desperta o nosso interesse devido a complexidade estrutural do canto em dueto que pode inferir alguma aprendizagem do canto. Com o intuito de identificar as regioes de controle da producao do canto nestes animais nos utilizamos diferentes tecnicas de marcacao celular coloracao de Nissl, hibridizacao in situ radioativa e injecao de tracadores neuronais; ferramentas neuroanatomicas estas que nos forneceram pistas sobre a presenca de areas cerebrais potencialmente envolvidas no sistema de controle do canto. Dos tres nucleos envolvidos na producao do canto, conseguimos identificar apenas o nucleo hipoglosso - porcao traqueosiringeal (NXIIts) e somente atraves da injecao do tracador neuronal CTB. Identificamos o NXIIts tanto em macho quanto em femeas e ao quantificar os dados verificamos que o volume deste nucleo e 2 vezes maior nos machos do que nas femeas, inferindo um possivel dimorfismo sexual. Ao compararmos o volume total de NXIIts entre o nosso animal experimental e uma especie de passaro Oscine, Taeniopigia guttata, verificamos que este nucleo foi quase 2 vezes maior em Taeniopigia guttata machos e femeas. Nao foram identificados nucleos telencefalicos que se assemelhassem ao HVC e ao RA de Oscines por meio de nenhuma das tecnicas utilizadas, o que nos leva a concluir que, em Myiozetetes cayanensis, nao haja sistema de controle do canto e que seu canto seja inato
Title in English
Neuroanatomical identification of cerebral areas related to the song production in a suboscine amazonian bird (Myiozetetes cayanensis).
Keywords in English
CTB
NXIIts
Song production
Song system control
Suboscines
Abstract in English
Along the years vocal learning has been repeatedly demonstrated in three bird orders (parrots, hummingbirds and the oscine songbirds). But recently some studies developed in three spicies of suboscine birds, Sayornis Phoebe, Procnias tricarunculata e Chiroxiphia linearis, demonstrated the existence of a rudmentary song system and/or extensive qualitative and quantitative vocal variations between reproductives populations suggesting that these species are capable of learning their songs. This evidence instigates the investigation of other suboscine songbirds spieces, since the distinction between learning and non-learning vocal birds is not that clear as thought. An amazon uboscine bird, Myiozetetes cayanensis, has attracted our attention due to the structural complexity of its duet song that may imply some vocal learning. Therefore, we tried to identificate the song control regions in this animals by means of different technics: Nissl staining, radioactive in situ hibridization and injections of neural tracers; neuroanatomical tools that provided important clues of cerebral areas implicated in the song system control. We identified only one of the three nuclei involved in the controlling of song production, the NXIIts and only by the injection of the neural tracer CTB. The NXIIts was identified both in males and females. When we quantified the data, we observed that the NXIIts was 2 times larger in males than in females, indicating a possible sexual dimorphism. We also compared the total volume of NXIIts between our experimental animal and a oscine species, Taeniopygia guttata. The volume of NXIIts was almost 2 times larger both in males and females of Taeniopigia guttata. We didint identified any nucleus that guards some resemblence to the oscine HVC or RA through none of the techniques that we tested. Therefore, we can assume that Myiozetetes cayanensis have no song control system and that their song are inate
 
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Publishing Date
2018-07-20
 
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