Doutorado em Ecologia e Evolução (ICB)
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Navegando Doutorado em Ecologia e Evolução (ICB) por Por Orientador "Bastos, Rogério Pereira"
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Item A influência das características da matriz em paisagens fragmentadas sobre a comunidade de aves no cerrado(Universidade Federal de Goiás, 2017-03-02) Bernardo, Paulo Vitor dos Santos; Oliveira, Arthur Ângelo Bispo de; http://lattes.cnpq.br/1100433822757573; Bastos, Rogério Pereira; http://lattes.cnpq.br/6015137404238990; Nomura, Fausto; Nabout, João Carlos; Tesesa, Fabrício; Pérsio, Marcos; Bastos, Rogério Pereira(Sem resumo em outra língua)Item A conservação da diversidade de anuros no cerrado brasileiro(Universidade Federal de Goiás, 2014-07-28) Lima, Luciana Signorelli Faria; With, Kimberly; Bastos, Rogério Pereira; http://lattes.cnpq.br/6015137404238990; Nomura,Fausto; http://lattes.cnpq.br/9506582657045983; Maciel, Natan Medeiros; http://lattes.cnpq.br/2116561844584292; Oliveira, Arthur Angelo Bispo de; http://lattes.cnpq.br/1100433822757573Land use activities have been frequently transforming broad native areas into pastures or plantations. This process turned out to be a global problem and is known as one major responsible for declinesin various taxonomical groups. Frogs are one of the most threated groups among vertebrates, from which species with aquatic larvae are more susceptible. Such populations follow metacommunity dynamics and can be structured in function of combined processes, such as patch dynamics, species ordination dynamics, mass effect and neutral dynamics. Nevertheless, the lack of knowledge with respect to anuran species occupation and richness patterns in local and regional scale poses as a threat to their conservation. The aim of my work is to provide relevant information to the conservation of anurans in the Brazilian Cerrado. I investigated regional and local scale patterns and identified factors related to richness and occupation of anuran species that breed in Cerrado ponds. For that, I have collected data in the state of Goiás, which is the only Brazilian state totally inserted in the Cerrado biome and that follows that same tendency of habitat loss as the whole biome (due to agriculture expansion). In Chapter I present the first official list for the whole state of Goiás, with the objective to cover inventory gaps. In Chapter II, I explore local and landscape factors that determine local and regional diversities of anurans. I also assess the effects of area, heterogeneity, productivity and local and landscape habitat complexity over alpha and beta diversities of anurans. In Chapter III, I approach one of the most classic and controversial models for the conservation of the species, known as "SLOSS" (single large or several small). This model should be considered especially when the goal is to preserve as many frog species associated with ponds.Finally, in Chapter IV, I built occupation models to assess the effects of amount of remaining habitats, isolation between remnants as well as local characteristics on the occurrence of some species of amphibians typical Brazilian Cerrado.Item Influência de indivíduos coespecíficos no comportamento acústico de machos de Hypsiboas goianus (Anura, Hylidae)(Universidade Federal de Goiás, 2014-06-18) Morais, Alessandro Ribeiro de; Márquez, Rafael; Bastos, Rogério Pereira; http://lattes.cnpq.br/6015137404238990; Bastos, Rogério Pereira; Solé, Mirco; Nomura, Fausto; Maciel, Natan Medeiros; Lingnau, RodrigoAcoustic signals are a key element in social interactions in anuran amphibians. Accordingly, different types of vocalizations can be emitted in specific social contexts. Thus, this study investigated the influence of conspecific individuals on the vocal behavior of Hypsiboas goianus. Field observations and playback experiments were conducted at the Silvânia National Forest, Silvânia, Goiás, central Brazil, in the breeding season between 2011 and 2013. We used playback experiments of pre-recorded advertisement calls to test the influence of conspecific calls on the acoustic behavior of males of H. goianus. We found that males change their acoustic behavior after stimulation by conspecifics calls. Specifically, males decrease the interval between calls, the emission rate of advertisement calls, and the duration of pulses. Additionally, we tested whether males of H. goianus use acoustic signals to discriminate large- from small-sized conspecifics. We used an experimental approach with playbacks of synthetic advertisement calls built with different dominant frequencies. We used calls with low frequency (3,123 Hz) to simulate large-sized individuals, and calls with high frequency (3,573 Hz) to simulate small-sized individuals. Males of H. goianus significantly altered their acoustic behavior in response to high-frequency calls by shortening the duration and emission rate of advertisement calls, but increasing the duration and number of pulses of the short aggressive call. Conversely, there were no changes in the acoustic behavior of males when stimulated by low-frequency advertisement calls. Finally, we tested whether males of H. goianus respond less aggressively to close neighbors than unknown intruders. To test this, we used playback experiments to stimulate males of H. goianus with calls of both adjacent neighbors and distant individuals. However, there was no change in the acoustic behavior of males. Our results show that males of H. goianus not only modify their acoustic behavior in 13 response to conspecific males, but also asses their competitors by using acoustic signals. Thus, the acoustic plasticity of males of H. goianus not only maximizes signal transmission, but also overcome the acoustic interference of conspecifics.