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Characterization of macroevolutionary patterns of body size in Testudinata

Grant number: 18/10276-7
Support type:Scholarships in Brazil - Master
Effective date (Start): November 01, 2018
Status:Discontinued
Field of knowledge:Biological Sciences - Zoology
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Max Cardoso Langer
Grantee:Bruna de Mattos Farina
Home Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Associated scholarship(s):19/06119-6 - Characterisation of deep-time body size evolutionary patterns in Testudinata, BE.EP.MS

Abstract

Testudinata is a morphologically disparate group that exhibits a rich fossil record. The linage probably was originated in terrestrial habitats, while the crown-group Testudines (i.e. modern turtles) would have arisen from a semi-aquatic group. Accordingly, turtles display remarkable morphological variations, including in size disparity, which reflects the different habitats they colonized through time. Phylogenetic comparative methods are the main tools to characterize evolutionary patterns and trait evolution. Therefore, this project aims to characterize body size evolution in Testudinata, using a large sample of extant and fossils taxa. For this, we will use the SURFACE algorithm, that assumes trait evolution within at multi-peak Ornstein-Uhlenbeck (OU) process, although we will test for presence of other models, such as Brownian Motion (BM), BM with trend, Early Burst and OU with just one peak. Additionally, using linear regression, we will test for the presence of correlations between patterns of body size and abiotic factors, as well as other biology-related factors.