10.5061/DRYAD.J4N09
Sherratt, Emma
University of Adelaide
Serb, Jeanne
Iowa State University
Adams, Dean
Iowa State University
Data from: Rates of morphological evolution, asymmetry and morphological
integration of shell shape in scallops
Dryad
dataset
2017
tempo and mode
bivalved scallops
Pectinidae
National Science Foundation
https://ror.org/021nxhr62
DEB-1118884 , DEB-1257287
2017-11-28T14:36:35Z
2017-11-28T14:36:35Z
en
https://doi.org/10.1186/s12862-017-1098-5
82185846 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Background: Rates of morphological evolution vary across different
taxonomic groups, and this has been proposed as one of the main drivers
for the great diversity of organisms on Earth. Of the extrinsic factors
pertaining to this variation, ecological hypotheses feature prominently in
observed differences in phenotypic evolutionary rates across lineages. But
complex organisms are inherently modular, comprising distinct body parts
that can be differentially affected by external selective pressures. Thus,
the evolution of trait covariation and integration in modular systems may
also play a prominent role in shaping patterns of phenotypic diversity.
Here we investigate the role ecological diversity plays in morphological
integration, and the tempo of shell shape evolution and of directional
asymmetry in bivalved scallops. Results: Overall, the shape of both valves
and the magnitude of asymmetry of the whole shell (difference in shape
between valves) are traits that are evolving fast in ecomorphs under
strong selective pressures (gliders, recessers and nestling), compared to
low rates observed in other ecomorphs (byssal-attaching, free-living and
cementing). Given that different parts of an organism can be under
different selective pressures from the environment, we also examined the
degree of evolutionary integration between the valves as it relates to
ecological shifts. We find that evolutionary morphological integration is
consistent and surprisingly high across species, indicating that while the
left and right valves of a scallop shell are diversifying in accordance
with ecomorphology, they are doing so in a concerted fashion. Conclusions:
Our study on scallops adds another strong piece of evidence that
ecological shifts play an important role in the tempo and mode of
morphological evolution. Strong selective pressures from the environment,
inferred from the repeated evolution of distinct ecomorphs, have
influenced the rate of morphological evolution in valve shape and the
magnitude of asymmetry between valves. Our observation that morphological
integration of the valves making up the shell is consistently strong
suggests tight developmental pathways are responsible for the concerted
evolution of these structures while environmental pressures are driving
whole shell shape. Finally, our study shows that directional asymmetry in
shell shape among species is an important aspect of scallop
macroevolution.
avspecimen_coords_LLandmark coordinate data in 3D of the left valve (202
landmarks) for 933 specimens of scallops. Coordinate data are Procrustes
residuals, and the average shape from 2 replicates. Specimen IDs
correspond to file "ID classifier
all.csv".avspecimen_coords_RLandmark coordinate data in 3D of the
right valve (202 landmarks) for 859 specimens of scallops. Coordinate data
are Procrustes residuals, and the average shape from 2 replicates.
Specimen IDs correspond to file "ID classifier all.csv"ID
classifier allClassifier file to relate specimen IDs to species.
Corresponds to specimen IDs in the following files:
avspecimen_coords_L_ProcLR.tps avspecimen_coords_L.csv
avspecimen_coords_R_ProcLR.tps avspecimen_coords_R.csv
rawspecimens_202_L_1.tps rawspecimens_202_L_2.tps rawspecimens_202_R_1.tps
rawspecimens_202_R_2.tps86sp scallop treePhylogenetic tree (time
calibrated) for 86 species of scallop.Spec classifier_ALLClassifier file
to relate species IDs to phylogenetic tree. See Supplementary Materials
Table S1 of paper for full list of
species.avspecimen_coords_L_ProcLRLandmark coordinate data in 3D of the
left valve (202 landmarks) for 699 specimens of scallops. Coordinate data
are Procrustes residuals, from a Procrustes fit of both lefts and
x-flipped rights. Specimen IDs correspond to file "ID classifier
all.csv".avspecimen_coords_R_ProcLRLandmark coordinate data in 3D of
the right valve (202 landmarks) for 699 specimens of scallops. Coordinate
data are Procrustes residuals, from a Procrustes fit of both lefts and
x-flipped rights. Specimen IDs correspond to file "ID classifier
all.csv".rawspecimens_202_L_1Landmark coordinate data in 3D of the
left valve (202 landmarks) for 933 specimens of scallops. Coordinate data
are raw coordinates digitised from 3D surface models, first of two
replicates. Specimen IDs correspond to file "ID classifier
all.csv".rawspecimens_202_L_2Landmark coordinate data in 3D of the
left valve (202 landmarks) for 933 specimens of scallops. Coordinate data
are raw coordinates digitised from 3D surface models, second of two
replicates. Specimen IDs correspond to file "ID classifier
all.csv".rawspecimens_202_R_1Landmark coordinate data in 3D of the
right valve (202 landmarks) for 859 specimens of scallops. Coordinate data
are raw coordinates digitised from 3D surface models, first of two
replicates. Specimen IDs correspond to file "ID classifier
all.csv".rawspecimens_202_R_2Landmark coordinate data in 3D of the
right valve (202 landmarks) for 859 specimens of scallops. Coordinate data
are raw coordinates digitised from 3D surface models, second of two
replicates. Specimen IDs correspond to file "ID classifier
all.csv".Sherratt et al BMC Evo Bio Asymmetry Rate MSR script for the
analyses of the paper.