Please use this identifier to cite or link to this item: https://biore.bio.bg.ac.rs/handle/123456789/1650
Title: Testing the evolutionary constraints of metamorphosis: The ontogeny of head shape in Triturus newts
Authors: Vučić, Tijana 
Sibinović, Maša
Vukov, Tanja D.
Tomašević Kolarov, Nataša
Cvijanović, Milena
Ivanović, Ana 
Keywords: Developmental constraints;hybridization;metamorphosis;ontogenetic trajectories;shape disparity
Issue Date: 1-Jun-2019
Rank: M21
Project: Diversity of the amphibians and reptiles on the Balkan Peninsula: evolutionary and conservation aspects 
Journal: Evolution
Abstract: 
© 2019 The Author(s). Evolution © 2019 The Society for the Study of Evolution. 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.
URI: https://biore.bio.bg.ac.rs/handle/123456789/1650
ISSN: 0014-3820
DOI: 10.1111/evo.13743
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