10.5061/DRYAD.M55M7
Stange, Madlen
University of Zurich
Aguirre-Fernández, Gabriel
University of Zurich
Salzburger, Walter
University of Basel
Sánchez-Villagra, Marcelo R.
University of Zurich
Data from: Study of morphological variation of northern Neotropical
Ariidae reveals conservatism despite macrohabitat transitions
Dryad
dataset
2018
Sciades
Ariidae
Bagre
Ariopsis
disparity
convevol
Cathorops
Holocene
Notarius
2018-03-15T14:02:59Z
2018-03-15T14:02:59Z
en
https://doi.org/10.1186/s12862-018-1152-y
294855 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Background: Morphological convergence triggered by trophic adaptations is
a common pattern in adaptive radiations. The study of shape variation in
an evolutionary context is usually restricted to well-studied fish models.
We take advantage of the recently revised systematics of New World Ariidae
and investigate skull shape evolution in six genera of northern
Neotropical Ariidae. They constitute a lineage that diversified in the
marine habitat but repeatedly adapted to freshwater habitats. 3D geometric
morphometrics was applied for the first time in catfish skulls and
phylogenetically informed statistical analyses were performed to test for
the impact of habitat on skull diversification after habitat transition in
this lineage. Results: We found that skull shape is conserved throughout
phylogeny. A morphospace analysis revealed that freshwater and marine
species occupy extreme ends of the first principal component axis and that
they exhibit similar Procrustes variances. Yet freshwater species occupy
the smallest shape space compared to marine and brackish species (based on
partial disparity), and marine and freshwater species have the largest
Procrustes distance to each other. We observed a single case of shape
convergence as derived from 'C-metrics', which cannot be
explained by the occupation of the same habitat. Conclusions: Although
Ariidae occupy such a broad spectrum of different habitats from sea to
freshwater, the morphospace analysis and analyses of shape and
co-variation with habitat in a phylogenetic context shows that
conservatism dominates skull shape evolution among ariid genera.
input_17LMcontains 3D landmark data of 17 landmarks taken on catfish
skullsinput_18LMcontains 3D geometric morphometric landmark data taken on
sea catfish skullsskulllinks_17LMcontains skull links necessary for
generalized Procrustes fit for the 17LM datasetskulllinks_18LMcontains
skull links necessary for generalized Procrustes fit for the 18LM
datasetoutlinecontains skull outline necessary for producing shape change
graphs from the 3D GM datar_analysesR script, contains all code necessary
to reproduce the results and figures presented in this manuscript, except
for the analyses of convergencer_AnalysisOfConvergenceR script, contains
all code necessary to reproduce the results and figures for the analyses
of convergence
Venezuela
Tropical Eastern Pacific
Panama
Caribbean