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| Author(s): |
Flavio de Oliveira Francisco
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2012-10-22 |
| Examining board members: |
Maria Cristina Arias;
Sueli Angelo Furlan;
Cristina Yumi Miyaki;
Isabel Alves dos Santos
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| Advisor: | Maria Cristina Arias |
| Abstract | |
Islands have been key research fields on the ecology and evolutionary biology for a long time. The study of their biota has made possible the development of important theories that could be extrapolated to other environments. The increase in deforestation and habitat fragmentation has led to isolation of the organisms in \"islands\" within the continent. Loss of diversity in fragments is a concern, because nowadays many species only exist in fragments. Populations restricted to islands or fragments have higher probability of extinction. Bees have a key role in ecosystems and the extinction of their populations will impact other trophic levels. The aim of this study was to test the hypothesis that populations of two bee species, Tetragonisca angustula and Bombus morio, in islands with more than 100 ha located in the states of Santa Catarina (SC), Paraná (PR), São Paulo (SP) and Rio de Janeiro (RJ), and mainland populations in areas near the Atlantic Forest remnants in the states of Minas Gerais (MG), PR, RJ, SC and SP have low genetic diversity and therefore would be more prone to extinction. Our results to T. angustula showed low mitochondrial genetic diversity which can be associated to queen philopatry behavior. Moreover, microsatellites showed lower structure and moderate/high genetic diversity, indicating a greater dispersion by males. The genetic diversity observed for B. morio for both markers was high, excepting two populations. Females also had higher population structure than detected for males. Therefore, most of T. angustula and B. morio populations are not prone to extinction, mainly because of their capability to survive in urban environments and high male migration. Therefore, these characteristics seem to be responsible for allowing many of the geographically isolated populations do not present genetic isolation (AU) | |
| FAPESP's process: | 08/08546-4 - Genetic structure of island and mainland populations of bees from Atlantic Forest |
| Grantee: | Flávio de Oliveira Francisco |
| Support Opportunities: | Scholarships in Brazil - Doctorate |