Banca de DEFESA: SIDNEI SAMPAIO DOS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : SIDNEI SAMPAIO DOS SANTOS
DATE: 28/02/2023
TIME: 08:30
LOCAL: https://conferenciaweb.rnp.br/webconf/henrique-batalha-filho-2
TITLE:

Vocal evolution in suboscine: the complexity of vocal variation and acoustic discrimination of ruficapilla complex

KEY WORDS:

vocal divergence; song evolution; neotropical region; acoustic recognition; playback

PAGES: 114
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUMMARY:

Acoustic signals mediate many interactions, such as mate choice and territory defense in numerous animals. Stochastic and deterministic forces shape divergence in acoustic signals that can drive behavior discrimination in many pathways. Acoustic discrimination influenced by signal divergence can create behavior barriers to gene flow, therefore, with the potential to play a crucial role in speciation and the evolutionary process. Nonetheless, the understanding of how selective regimes drive acoustic divergence and, by consequence, influence behavior response is poorly studied in birds with innate vocalization (for example, suboscines passerines). In suboscines birds, vocalizations are considered innate, and divergence signal from cultural evolution is low or less possible. Therefore, these birds are an excellent system to test the effects of stochastic and determinist processes in acoustic evolution and behavior discrimination without the impact of cultural learning. Here, we tested the effects of stochastic and deterministic processes shaping acoustic divergence in suboscines passerines, specifically in spinetails of the Synallaxis ruficapilla complex that are endemic to the Atlantic Forest. Additionally, we tested the role of signal divergence and phylogenetic relationships in the behavior discrimination through playback experiments. To test evolutionary forces acting in vocal divergence, we analyzed the vocal sampling covering a broad region within the complex's geographic distribution. To test biological relevance and behavior discrimination, we conducted playback experiments in three isolated populations covering the principal clades of the complex. Our results indicate that vocal variation in the ruficapilla complex does not mirror phylogenetic relationships. Instead, stochastic processes, sexual selection, geographic space, and habitat emerge as candidates to explain a puzzling vocal variation in the complex. Additionally, our results show that song discrimination in suboscine through playback is symmetric, and clades of ruficapilla complex similarly exhibited strong behavioral responses to the conspecific songs. The pattern of response to heterospecific does not show a significant statistical difference. Still, the tendency of behavior response to heterospecific in each clade can be clues leading to possible paths followed by the group in recent historical evolution. Surprisingly, we found no significant relationship between phylogenetic or acoustic similarity with behavior response. Our results suggest that evolutionary processes can shape distinct elements of the song in specific ways with the potential to play a crucial role in the acoustic discrimination of suboscine passerines.

COMMITTEE MEMBERS:
Presidente - 2048980 - HENRIQUE BATALHA FILHO
Interno - 1349793 - MARCELO FELGUEIRAS NAPOLI
Externo à Instituição - GUILHERME HENRIQUE SILVA DE FREITAS - UFG
Externo à Instituição - LUIZ PEDREIRA GONZAGA - UFRJ
Externo à Instituição - MARIO COHN-HAFT - INPA