Paedogenesis in European newts (Triturus: Salamandridae): Cranial morphology during ontogeny

Djorović, Ana; Kalezić, Miloš L.

doi:10.1002/(sici)1097-4687(200002)243:2<127::aid-jmor2>3.0.co;2-0

Cited by 21 publications

(22 citation statements)

References 17 publications

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“…Juvenile and adult individuals of T. vulgaris (Linnaeus, 1758) and T. alpestris (Laurenti, 1768) were collected from natural populations (relevant data in DjoroviT and KaleziT 2000;IvanoviT et al 2005). Adult individuals of the cristatus group were represented by population samples of T. carnifex (Laurenti, 1768) (Podstrmec, Slovenia), T. cristatus (Laurenti, 1768) (Mirob Mt., Serbia), T. dobrogicus (Kiritzescu, 1903) (Svetozar MiletiT, Serbia), and T. karelinii (Strauch, 1870) (Vlasi, Serbia).…”

Section: Species and Samples Analyzedmentioning

confidence: 99%

“…Ontogenetic shape changes can be markedly non-linear (Bookstein 1991;. Also, developmental rate can be variable, while complex structures such as the skull can exhibit spatiotemporal variation in patterns of development (Zelditch and Carmichael 1989;Zelditch et al 1992;DjoroviT and KaleziT 2000).…”

Section: Post-metamorphic Modeling Of the Triturus Skullmentioning

confidence: 99%

“…The highly specialized larval skeleton changes rapidly during metamorphic transition from the aquatic larval to the terrestrial juvenile stage. Morphological organization of the skull at the post-metamorphic stage corresponds to that of the adult skull (Duellman and Trueb 1986;Reilly 1990;DjoroviT and KaleziT 2000;Lebedkina 2004). Although amphibians have indeterminate growth, in newts the growth rate diminishes with size in a linear way (Hagström 1977;Miaud et al 2000;Arntzen 2000;Olgun et al 2005).…”

Section: Introductionmentioning

confidence: 98%

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Ontogeny of skull size and shape changes within a framework of biphasic lifestyle: a case study in six Triturus species (Amphibia, Salamandridae)

et al. 2007

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As with many other amphibians, Triturus species are characterized by a biphasic life cycle with abrupt changes in the cranial skeleton during metamorphosis. The post-metamorphic shape changes of the cranial skeleton were investigated using geometric morphometric techniques in six species: Triturus alpestris, T. vulgaris, T. dobrogicus, T. cristatus, T. carnifex, and T. karelinii. The comparative analysis of ontogenetic trajectories revealed that these species have a conserved developmental rate with divergent ontogenetic trajectories of the ventral skull shape that mainly reXect phylogenetic relatedness. A striking exception in the ontogenetic pattern was possibly found in T. dobrogicus, characterized by a marked increase in the developmental rate compared to the other newt species. The size-related shape changes explained a large proportion of shape change during postmetamorphic growth within each species, with marked positive allometric growth of skull elements related to foraging.

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Section: Species and Samples Analyzedmentioning

confidence: 99%

Section: Post-metamorphic Modeling Of the Triturus Skullmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Ontogeny of skull size and shape changes within a framework of biphasic lifestyle: a case study in six Triturus species (Amphibia, Salamandridae)

et al. 2007

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“…The differences between morphs are mainly due to the variation of characters related to feeding and locomotion as has been suggested in similar studies (Tucić et al 1985;Djorović and Kalezić 2000). Although the presence Journal of Natural History 441 of external gills in paedomorphic individuals is responsible for the relatively wider heads, the simultaneous reduction of the mouth opening could reflect alternative feeding habits.…”

Section: Influence Of Paedomorphosis In Morphometric Variationmentioning

confidence: 99%

Patterns of morphometric variation in the smooth newt (Lissotriton vulgaris) from Greece: environmental correlates

Sotiropoulos

Legakis

Polymeni

2008

Journal of Natural History

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Multivariate analyses were applied to an array of body measures of smooth newt specimens derived from 14 local populations of two subspecies in Greece, in order to describe, analyse and detect patterns and putative causes of among-population morphometric variation. The two subspecies do not differ morphometrically, in spite of their considerable genetic differentiation. Paedomorphosis explains a significant portion of the observed morphometric differentiation of populations. Differences between the two morphs refer mostly to characters and structures relevant to feeding and locomotion, which might lead to niche segregation and subsequent reduction of intra-population competition. Body size varies in relation to altitude probably as a result of differential developmental processes or as an environmentally induced response to varying predation pressures. Variation of different aspects of the external morphology is correlated both to climatic factors and habitat characteristics.

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“…Previous studies on the very same populations revealed that conspecific metamorphic and paedomorphic adults differ in body size and shape changes during ontogeny , and that in both species paedomorphs have less prominent sexual dimorphism (Kalezić et al, 1992). Paedomorphosis also significantly affects the cranial skeleton -paedomorphic individuals of both species are characterised with cranial organisation that mostly corresponds to organisation of the cranial skeleton at late larval stage, before metamorphosis (Djorović and Kalezić, 2000).…”

Section: Introductionmentioning

confidence: 99%

Morphological integration of cranium and postcranial skeleton during ontogeny of facultative paedomorphic European newts (Triturus vulgaris and T. alpestris)

Aleksic¹,

Kalezić²,

Ivanović³

2005

Amphib Reptilia

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The patterns of ontogenetic and interspecific variation of morphological integration (the relationships and correlation patterns of functionally and developmentally related morphological traits) in facultative paedomorphic species of two European newts (Triturus vulgaris and T. alpestris) were examined. The degree of morphological integration differed among ontogenetic stages. Variation in the level of morphological integration of cranium and postcranial skeleton during ontogeny of paedomorphic newts had the same pattern in both analysed species. The lowest level of cranium morphological integration characterises the larvae and the juveniles. Individuals that follow alternative life-history path (paedomorphs) remain at a relatively low level of morphological integration, while integration highly increased in metamorphosed adult individuals. Limb skeleton also showed a lower level of integration in paedomorphs in comparison with metamorphosed individuals. The hypothesis of morphological integration was confirmed for all stages of T. vulgaris, while the same hypothesis was confirmed only for larval and paedomorphic stages of T. alpestris. In T. vulgaris, metamorphosis changes the pattern of correlation among the cranial traits, while in T. alpestris, the patterns of phenotypic correlation among the cranial traits remain substantially similar for all analysed ontogenetic stages.

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Paedogenesis in European newts (Triturus: Salamandridae): Cranial morphology during ontogeny

Cited by 21 publications

References 17 publications

Ontogeny of skull size and shape changes within a framework of biphasic lifestyle: a case study in six Triturus species (Amphibia, Salamandridae)

Ontogeny of skull size and shape changes within a framework of biphasic lifestyle: a case study in six Triturus species (Amphibia, Salamandridae)

Patterns of morphometric variation in the smooth newt (Lissotriton vulgaris) from Greece: environmental correlates

Morphological integration of cranium and postcranial skeleton during ontogeny of facultative paedomorphic European newts (Triturus vulgaris and T. alpestris)

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