Papers by Thais Maya Aguilar
Biologia da nidificação de Lathrotriccus euleri (Cabanis, 1968) (Tyrannidae) em fragmentos de mata de Minas Gerais
Revista Brasileira de Ornitologia
Population Viability analysis of Lear’s Macaw – Anodorhynchus leari
Brazilian Journal of Biology, 2007
Nest and or nest site reuse within and between breeding seasons was reported by the Euler's F... more Nest and or nest site reuse within and between breeding seasons was reported by the Euler's Flycatcher (Lathrotriccus euleri), the Sepia-capped Flycatcher (Leptopogon amaurocephalus) and the Gray-hooded Flycatcher (Mionectes -rufiventris) in forest fragments from southeastern Brazil. Nest and or nest site reuse between some years was frequent within a single breeding season by the Sepia-capped Flycatcher. Nest reuse, however, was not related to nesting success in the previous breeding attempt. Nest turnover rates (movement to a new site between years) were low for L. amaurocephalus, intermediate for L. euleri and high for M. rufiventris.
The Wilson Journal of Ornithology, 2012
The Yellow-olive Flatbill (Tolmomyias sulphurescens) is a small insectivorous passerine inhabitin... more The Yellow-olive Flatbill (Tolmomyias sulphurescens) is a small insectivorous passerine inhabiting Neotropic forests. Its breeding biology is poorly known despite its abundance and conspicuousness. We describe the nesting biology of Yellow-olive Flatbills from Atlantic Forest fragments in Belo Horizonte County, Minas Gerais State, southeastern Brazil. Eighty nests were monitored every 3-5 days from August to January between 1995 and 2000. Active nests were found from mid-September through late December with a peak from mid October through late November. First clutches were usually laid during the first rains, but prior to the main peak in annual rainfall. The Yellow-olive Flatbill builds closed, pencile nests on tree branches along streams or roads, principally of dark fungal (Marasmius sp.) fibers. Clutch size ranged from two to four white eggs. Incubation was irregular and hatching was asynchronous. Incubation and nestling periods were 20 and 23 days, respectively. Nesting success across all 5 years was 29% (mean among years 5 31%, CI 5 25-37%), and nest predation was the main cause of nest failure (49%). Mayfield estimates of nest survival were low (mean 5 26%, CI 5 17-36%), and the probability of an egg to produce a fledgling was only 10%. Fledging success was 0.8 fledglings per breeding pair, and chicks fledged at 107% (CI 5 106-108%) of mean adult body mass. Our results do not support the purported pattern of long breeding seasons for tropical birds. The Yellow-olive Flatbill laid unusually large clutches, had lower nest survival, and greater fledgling productivity compared with other tropical passerines.
Journal of Field Ornithology, 2008
Behavioral Ecology, 2007
The handicap principle proposes that male sexual ornaments and displays provide honest indicators... more The handicap principle proposes that male sexual ornaments and displays provide honest indicators of quality. Female preference for high-quality males, however, may be driven not only by genetic benefits but also by indirect benefits. We investigated the impact of parasitism on morphological, ornamental, and behavioral characteristics of male and female blue-black grassquits (Volatinia jacarina) in captivity. First, we tested whether male displays and morphology were influenced by parasitism. Second, we assessed if females were attentive to variation in male morphology and displays linked to parasitism. Third, we tested whether parasitism in females influenced health and mate preferences. We maintained 2 groups of birds in captivity: nonmedicated birds developed high levels of coccidian parasitism, whereas medicated birds were free of parasitism. Parasitized males developed, relative to nonparasitized males, lower weight/tarsus indices and mass. They also showed relative deficiencies in their displays, with less persistence and lower rates. Despite the negative effects of parasitism on males, females did not prefer nonparasitized males. This held for both parasitized and nonparasitized females. Our data suggest that coccidian parasitism has adverse effects on morphological condition and expression of displays. These effects, however, appear not to be attended to by females; moreover, female mate preferences appear not to be impacted by the threat of parasitism. It thus seems that female mate preferences may not depend only on sexual characters affected by parasitism in this species.
CAPÍTULO I: O impacto de parasitas sobre ornamentos, morfologia e comportamento de Volatinia jaca... more CAPÍTULO I: O impacto de parasitas sobre ornamentos, morfologia e comportamento de Volatinia jacarina (Aves, Emberizidae) CAPÍTULO II: Fêmeas de Volatinia jacarina (Aves, Emberizidae) preferem machos não parasitados? CAPÍTULO III: Influência do parasitismo sobre a condição corporal de fêmeas de Volatina jacarina (Aves, Emberizidae) CAPÍTULO IV: Seleção de sítios de nidificação e biologia reprodutiva em Volatinia jacarina (Aves, Emberizidae) V CAPÍTULO V: Ausência de efeitos de parasitas sobre características morfológicas de Volatinia jacarina (Aves, Emberizidae) em condições silvestres ANEXOS Anexo I: Tabela 1-Valores dos displays e taxas de salto, altura e persistência para cada macho individualmente Anexo II: Tabela 2-Espécies de plantas encontradas nos pontos avaliados para a seleção de habitat dos ninhos de Volatinia jacarina. Anexo III: Artigo submetido ao Journal of Field Biology (de acordo com as exigências de defesa da Pós-Graduação em Biologia Animal)-Lack of Parasitic Effects Upon Morphological and Ornamental Traits of The Blue-black Grassquit (Volatinia jacarina) Under Natural Conditions 154-162.
Ornitologia …, 2000
Resumo. Mionectes rufiventris ("Abre-asa-de-cabeça-cinza") é um Passeriforme frugívoro de matas t... more Resumo. Mionectes rufiventris ("Abre-asa-de-cabeça-cinza") é um Passeriforme frugívoro de matas tropicais, cuja ecologia reprodutiva é muito pouco conhecida. O objetivo deste estudo foi descrever diversos detalhes da sua biologia da nidificação em fragmentos florestais localizados nos municípios de Belo Horizonte e Nova Lima, MG, Brasil. Ninhos (N = 17) foram monitorados a cada 3-5 dias de agosto a janeiro de 1995, 1996, 1997 e 1998. Mionectes rufiventris constrói ninhos fechados em barrancos e em folhas secas de Pteridium ao longo de córregos utilizando fibra vegetal seca e fungos (Marasmius). As ninhadas foram invariavelmente de três ovos (N = 11), sendo estes de cor branca (N = 12) e possuíram os seguintes parâmetros: massa = 2,4 ± 0,1 g (N = 12); largura = 14,8 ± 0,1 mm (N = 15); e comprimento = 20,8 ± 0,2 mm (N = 15). As estimativas do tempo de incubação e o período que os filhotes permanecem no ninho foram de 22 dias (N = 1) e de 19,3 ± 1,3 dias (N = 3), respectivamente. O sucesso reprodutivo foi de 24,4%, com 47,1% dos ninhos tendo sido predados, 11,8% sendo abandonados e 11,8% perdidos por outras causas.
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Papers by Thais Maya Aguilar