| Grant number: | 16/07246-3 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| Start date: | April 01, 2017 |
| End date: | August 13, 2017 |
| Field of knowledge: | Biological Sciences - Zoology - Taxonomy of Recent Groups |
| Principal Investigator: | Naercio Aquino Menezes |
| Grantee: | Fernando Cesar Paiva Dagosta |
| Host Institution: | Museu de Zoologia (MZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
Abstract The present project aims to detect the presence of incongruence and to investigate its influence in biogeographic analyses of amazonian fishes. Incongruence is the degree of disagreement between topologies resulting from different datasets. Its identification and treatment remain mostly controversial within the realm of systematics. In biogeography, discussions about incongruence between different datasets are extremely rare, even if its implications and consequences are equally or even more relevant. The main idea of cladistic biogeography is the search for historical congruence of biogeographical patterns involving different groups of organisms, without finding or trying to explain incongruence. Thus, the present project is pioneer in identifying incongruence based on comparison of different qualitative variables from the datasets (migratory fishes x non-migratory fishes, different taxonomic groups and different body size in lineages). The biogeographic analyses will be performed by using vicariant biogeographic methods (e.g., BPA) and detection of incongruence will be done using three different, but complementary, methods: incongruence length difference, partitioned bremer support e sensitivity analysis. Once identified, incongruence will be discussed in the light of its sources (incorrect area definition, restricted sample, temporal mixture, extinction, and sympatric speciation, cladogenetic failure after vicariant event, biotic dispersion, random dispersal and intrinsic biological characteristics of the lineages). The project will represent an unprecedented and pioneering formalization of the problem of incongruence in biogeographic analyzes, with the development of a comprehensive and coherent formulation about the theoretical and conceptual bases on the subject. (AU) | |
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