Data from: Ecological and phylogenetic dimensions of the cranial shape diversification in South American caviomorph rodents (Rodentia: Hystricomorpha)
Álvarez, Alicia, National University of La Plata
Perez, S. Ivan, National University of La Plata
Verzi, Diego H., National University of La Plata
Published Jul 18, 2013 on Dryad.
Cite this dataset
Álvarez, Alicia; Perez, S. Ivan; Verzi, Diego H. (2013). Data from: Ecological and phylogenetic dimensions of the cranial shape diversification in South American caviomorph rodents (Rodentia: Hystricomorpha) [Dataset]. Dryad. https://doi.org/10.5061/dryad.qg67c
Caviomorph rodents represent an excellent model to explore morphological diversification on a macroevolutionary scale, as they are ecologically and morphologically diverse. We analysed cranial shape variation using geometric morphometrics and phylogenetic comparative methods. Most variation involved the shape of the rostrum, basicranium, and cranial vault, and clearly matched the phylogenetic structure. At the same time, a strong allometric pattern was associated with the length of the rostrum and cranial vault, size of the auditory bulla, and depth of the zygomatic arch. After accounting for size influence, and taking phylogenetic structure into account, shape variation was significantly associated with habitat. Our results highlight the presence of complex relationships between morphological, phylogenetic, and ecological dimensions in the diversification of the caviomorph cranium.
Regression Scores (RegScore1) obtained from an Ordinary Least Square regression between Procrustes Coordinates (original data: 43 landmarks from caviomorph crania) and ln-CS. These were obtained using MorphoJ (Klingenberg, 2011).
Phylogenetic relationships among caviomorphs studied. Phylogenetic relationships were estimated through Bayesian inference methods implemented in BEAST v1.6.1. Sequences from the Growth Hormone Receptor (GHR), Transtyrethin Hormone (TTH) and mitochondrial subunit 12S (12S rRNA) were used. Values correspond to estimated age of each taxa.
Procrustes coordinates obtained through a Generalized Procrustes Analysis (GPA) on raw coordinates of 43 landmarks representing caviomorph cranial shape. To obtain average ProcCoord for each genus, a separate GPA was carried for each one in Morphologika 2.5.
PC scores for caviomorph genera within a morphospace constructed through a Principal Component Analysis on the residuals of an Ordinary Least Square regression between Procrustes Coordinates (raw data: 43 landmarks representing cranial shape) and lnCS (natural-log transformed centroid sizes). This analysis was carried out using MorphoJ (Klingenberg, 2011)
Relative Warps scores (i.e. PC scores) of caviomorph taxa corresponding to the study of cranial shape variation. RWA was performed on the Procrustes Coordinates of 43 landmarks representing cranial shape. This analysis was carried out using MorphoJ (Klingenberg, 2011)
variabes used in regression analyses. Chew, main direction of masticatory movements; BF, bite force; lnCS natural-log of Centroid size.