The ontogenetic origins of skull shape disparity in the <i>Triturus cristatus</i> group

Cvijanović, Milena; Ivanović, Ana; Kalezić, Miloš L.; Zelditch, Miriam Leah

doi:10.1111/ede.12093

Cited by 19 publications

(26 citation statements)

References 45 publications

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“…Our results are complementary to Cvijanović et al. (), suggesting that during ontogeny (from hatchlings to adults) disparity is mostly constant, with a notable increase in disparity at the metamorphosed stage.…”

Section: Discussionsupporting

confidence: 84%

“…There is a marked difference in the ontogenetic pattern of variation recorded for head shape (Cvijanović et al. ; this study) and body shape (Ivanović et al. ).…”

Section: Discussionmentioning

confidence: 65%

“…However, a more detailed study of Triturus skull shape ontogeny indicated no differences in disparity between juveniles and adults (Cvijanović et al. ). Such differences in the disparity patterns of skull shape in two studies could be explained by inadequate sampling and the selection of species in the earlier study (Ivanović et al.…”

Section: Discussionmentioning

confidence: 99%

“…) and the shape of metamorphs, juveniles, and adults (Cvijanović et al. ; Ivanović and Arntzen ). In natural populations of crested newts, hybridization is an important force that shapes phenotypic variability at species’ contact zones (Crnobrnja‐Isailović et al.…”

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confidence: 99%

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Testing the evolutionary constraints of metamorphosis: The ontogeny of head shape inTriturusnewts

et al. 2019

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In vertebrates with complex, biphasic, life cycles, larvae have a distinct morphology and ecological preferences compared to metamorphosed juveniles and adults. In amphibians, abrupt and rapid metamorphic changes transform aquatic larvae to terrestrial juveniles. The main aim of this study is to test whether, relative to larval stages, metamorphosis (1) resets the pattern of variation between ontogenetic stages and species, (2) constrains intraspecific morphological variability, and (3) similar to the “hour‐glass” model reduces morphological disparity. We explore postembryonic ontogenetic trajectories of head shape (from hatching to completed metamorphosis) of two well‐defined, morphologically distinct Triturus newts species and their F1 hybrids. Variation in head shape is quantified and compared on two levels: dynamic (across ontogenetic stages) and static (at a particular stage). Our results show that the ontogenetic trajectories diverge early during development and continue to diverge throughout larval stages and metamorphosis. The high within‐group variance and the largest disparity level (between‐group variance) characterize the metamorphosed stage. Hence, our results indicate that metamorphosis does not canalize head shape variation generated during larval development and that metamorphosed phenotype is not more constrained relative to larval ones. Therefore, metamorphosis cannot be regarded as a developmental constraint, at least not for salamander head shape.

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Section: Discussionsupporting

confidence: 84%

“…There is a marked difference in the ontogenetic pattern of variation recorded for head shape (Cvijanović et al. ; this study) and body shape (Ivanović et al. ).…”

Section: Discussionmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Testing the evolutionary constraints of metamorphosis: The ontogeny of head shape inTriturusnewts

et al. 2019

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“…; Cvijanović et al. ), pointing to high evolvability of allometric relations of the skull shape in salamandrid salamanders. However, the shortening and widening of the oticoccipital region, with parallel changes in the position of the jaw articulation point, are changes in shape that are associated with evolutionary change in size in salamandrid salamanders.…”

Section: Discussionmentioning

confidence: 99%

Evolution of skull shape in the family Salamandridae (Amphibia: Caudata)

Ivanović

Arntzen

2017

Journal of Anatomy

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We carried out a comparative morphometric analysis of 56 species of salamandrid salamanders, representing 19 out of 21 extant genera, with the aim of uncovering the major patterns of skull shape diversification, and revealing possible trends and directions of evolutionary change. To do this we used micro-computed tomography scanning and three-dimensional geometric morphometrics, along with a well-resolved molecular phylogeny. We found that allometry explains a relatively small amount of shape variation across taxa. Congeneric species of salamandrid salamanders are more similar to each other and cluster together producing distinct groups in morphospace. We detected a strong phylogenetic signal and little homoplasy. The most pronounced changes in the skull shape are related to the changes of the frontosquamosal arch, a unique feature of the cranial skeleton for the family Salamandridae, which is formed by processes arising from the frontal and squamosal bones that arch over the orbits. By mapping character states over the phylogeny, we found that a reduction of the frontosquamosal arch occurs independently in three lineages of the subfamily Pleurodelinae. This reduction can probably be attributed to changes in the development and ossification rates of the frontosquamosal arch. In general, our results are similar to those obtained for caecilian amphibians, with an early expansion into the available morphospace and a complex history characterizing evolution of skull shape in both groups. To evaluate the specificity of the inferred evolutionary trajectories and Caudata-wide trends in the diversity of skull morphology, information from additional groups of tailed amphibians is needed.

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A staging table of Balkan crested newt embryonic development to serve as a baseline in evolutionary developmental studies

Vučić,

Drobnjaković,

Ajduković

et al. 2024

J Exp Zool Pt B

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There is an increased interest in the evolution and development of newts from the genus Triturus because: (1) morphological differentiation among the nine constituent species largely corresponds to different ecological preferences, (2) hybridization between different species pairs has various evolutionary outcomes in terms of life history traits and morphology, and (3) the genus expresses a balanced lethal system that causes arrested growth and death of half of the embryos. These features provide natural experimental settings for molecular, morphological, and life‐history studies. Therefore, we produce a staging table for the Balkan crested newt (T. ivanbureschi). We provide detailed descriptions of 34 embryonic stages based on easily observable and interpretable external morphological characters, to ensure reproducibility. Compared with previous staging tables for Triturus, we include a vastly increased sample size and provide high‐resolution photographs in lateral, ventral, and dorsal view, complemented by videos of specific developmental periods, and accompanied by detailed explanations on how to delineate the specific stages. Our staging table will serve as a baseline in comparative studies on Triturus newts: an emerging model system in evolutionary and developmental studies.

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The ontogenetic origins of skull shape disparity in the Triturus cristatus group

Cited by 19 publications

References 45 publications

Testing the evolutionary constraints of metamorphosis: The ontogeny of head shape inTriturusnewts

Testing the evolutionary constraints of metamorphosis: The ontogeny of head shape inTriturusnewts

Evolution of skull shape in the family Salamandridae (Amphibia: Caudata)

A staging table of Balkan crested newt embryonic development to serve as a baseline in evolutionary developmental studies

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