10.5061/DRYAD.GV3R544
Farina, Stacy C.
Howard University
Knope, Matthew L.
University of Hawaii at Hilo
Corn, Katherine A.
University of California, Davis
Summers, Adam P.
University of Washington
Bemis, William E.
Cornell University
Data from: Functional coupling in the evolution of suction feeding and
gill ventilation of sculpins (Perciformes: Cottoidei)
Dryad
dataset
2019
National Science Foundation
https://ror.org/021nxhr62
DEB-1310812
2019-05-01T14:19:45Z
2019-05-01T14:19:45Z
en
https://doi.org/10.1093/icb/icz022
48336238 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Suction feeding and gill ventilation in teleosts are functionally coupled,
meaning that there is an overlap in the structures involved with both
functions. Functional coupling is one type of morphological integration, a
term that broadly refers to any covariation, correlation, or coordination
among structures. Suction feeding and gill ventilation exhibit other types
of morphological integration, including functional coordination (a
tendency of structures to work together to perform a function) and
evolutionary integration (a tendency of structures to covary in size or
shape across evolutionary history). Functional coupling, functional
coordination, and evolutionary integration have each been proposed to
limit morphological diversification to some extent. Yet teleosts show
extraordinary cranial diversity, suggesting that there are mechanisms
within some teleost clades that promote morphological diversification,
even within the highly integrated suction feeding and gill ventilatory
systems. To investigate this, we quantified evolutionary integration among
four mechanical units associated with suction feeding and gill ventilation
in a diverse clade of benthic, primarily suction-feeding fishes
(Cottoidei; sculpins and relatives). We reconstructed cottoid phylogeny
using molecular data from 108 species, and obtained 24 linear measurements
of four mechanical units (jaws, hyoid, opercular bones, and branchiostegal
rays) from micro-CT reconstructions of 44 cottoids and one outgroup taxon.
We tested for evolutionary correlation and covariation among the four
mechanical units using phylogenetically corrected principal component
analysis to reduce the dimensionality of measurements for each unit,
followed by correlating phylogenetically independent contrasts and
computing phylogenetic generalized least squares models from the first
principle component axis of each of the four mechanical units. The jaws,
opercular bones, and branchiostegal rays show evolutionary integration,
but the hyoid is not positively integrated with these units. To examine
these results in an ecomorphological context, we used published ecological
data in phylogenetic ANOVA models to demonstrate that the jaw is larger in
fishes that eat elusive or grasping prey (e.g., prey that can easily
escape or cling to the substrate) and that the hyoid is smaller in
intertidal and hypoxia-tolerant sculpins. Within Cottoidei, the relatively
independent evolution of the hyoid likely has reduced limitations on
morphological evolution within the highly morphologically integrated
suction feeding and gill ventilatory systems.
Trees, data files, and R scriptbesttree_icz022.tree = maximum clade
credibility tree from best MrBayes run; cottoidei.run1.t = posterior
distribution of trees from best MrBayes run; Functional Couping Stats
icz022.R = R Script for all analyses in this study; ctdata_icz022.txt =
morphological measurements from micro-CT scans of 45 species; CSV files =
ecological dataicz022_dryad.zip