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

Aleksic, I.; Kalezić, Miloš L.; Ivanović, Ana

doi:10.1163/156853805774806223

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…All analysed population samples, except for two, came from the G. DqukiT Herpetological Collection housed in the Institute for Biological Research "Sinina StankoviT," Belgrade. The sample from Bukumirsko Lake was previously used for the analysis of morphological integration and skull ontogeny (IvanoviT et al 2005(IvanoviT et al , 2007.…”

Section: Examined Materialsmentioning

confidence: 99%

Skull size and shape variation versus molecular phylogeny: a case study of alpine newts (Mesotriton alpestris, Salamandridae) from the Balkan Peninsula

Ivanović

Sotiropoulos

Džukić³

et al. 2009

Zoomorphology

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We explored the phylogenetic signal of skull size and shape in alpine newts from the Balkans, a group of European newts that, in spite of their considerable phylogeographic substructuring (as inferred from previous DNA analyses), maintain a conserved phenotype. In terms of skull shape disparity, geometric morphometrics show that the dorsal cranium carries a signiWcant phylogenetic signal, the most notable evidence in this present study. On the contrary, no phylogenetic signal in the shape of the ventral cranium was found. This result indicates that the variation in the shape of the ventral cranium is more prone to other factors and processes, such as adaptations to local environments rather than phylogenetic constraints. Variation in skull size within alpine newts seems to be independent from phylogenetic constraints.

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Section: Examined Materialsmentioning

confidence: 99%

Skull size and shape variation versus molecular phylogeny: a case study of alpine newts (Mesotriton alpestris, Salamandridae) from the Balkan Peninsula

Ivanović

Sotiropoulos

Džukić³

et al. 2009

Zoomorphology

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“…The large range of ecologies and developmental histories across lissamphibians, along with their impressive cranial diversity, suggest patterns of cranial integration in this clade may be complex. However, studies of European newts at the static level have found that the skull is highly integrated with no distinct modules (Ivanović et al, 2005;Ivanović & Kalezić, 2010), a result mirrored at the evolutionary level across the myobatrachid frog family (Vidal-García & Keogh 2017). Interestingly, static integration of the cranium is lower for paedomorphic forms of two European newts compared with fully metamorphosed forms, which can be explained by ontogenetic integration, where integration increases post-metamorphosis (Ivanović et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…However, studies of European newts at the static level have found that the skull is highly integrated with no distinct modules (Ivanović et al, 2005;Ivanović & Kalezić, 2010), a result mirrored at the evolutionary level across the myobatrachid frog family (Vidal-García & Keogh 2017). Interestingly, static integration of the cranium is lower for paedomorphic forms of two European newts compared with fully metamorphosed forms, which can be explained by ontogenetic integration, where integration increases post-metamorphosis (Ivanović et al, 2005). Mixed support was found for a range of three to five module models across different toad species of the Rhinella granulosa complex (Simon & Marroig, 2017), and for caecilians, a two-module model was found as best supported for the skull at both the evolutionary and static level (Sherratt, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…We also determine whether integration constrains or facilitates morphological diversity (disparity) by quantifying the relationship between withinmodule variance and within-module magnitude of integration. Combined, these analyses allow us to assess static (intraspecific) modularity and integration within a population, for qualitative comparison to previous studies of modularity and integration within lissamphibians [e.g., in caecilians (Bardua et al, 2019b;Marshall et al, 2019), frogs and toads (Simon & Marroig, 2017;Vidal-García & Keogh 2017) and salamanders and newts (Ivanović et al, 2005;Ivanović & Kalezić, 2010)] and amniotes. This study thus adds to a rich and increasing pool of understanding the evolution and significance of phenotypic integration and modularity for shaping organismal variation at micro-and macroevolutionary scales.…”

Section: Introductionmentioning

confidence: 99%

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Cranial integration in the fire salamander, Salamandra salamandra (Caudata: Salamandridae)

Bon

Bardua

Goswami

et al. 2020

Biological Journal of the Linnean Society

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Phenotypic integration and modularity are concepts that represent the pattern of connectivity of morphological structures within an organism. Integration describes the coordinated variation of traits, and analyses of these relationships among traits often reveals the presence of modules, sets of traits that are highly integrated but relatively independent of other traits. Phenotypic integration and modularity have been studied at both the evolutionary and static level across a variety of clades, although most studies thus far are focused on amniotes, and especially mammals. Using a high-dimensional geometric morphometric approach, we investigated the pattern of cranial integration and modularity of the Italian fire salamander (Salamandra salamandra giglioli). We recovered a highly modular pattern, but this pattern did not support either entirely developmental or functional hypotheses of cranial organisation, possibly reflecting complex interactions amongst multiple influencing factors. We found that size had no significant effect on cranial shape, and that morphological variance of individual modules had no significant relationship with degree of within-module integration. The pattern of cranial integration in the fire salamander is similar to that previously recovered for caecilians, with highly integrated jaw suspensorium and occipital regions, suggesting possible conservation of patterns across lissamphibians.

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“…Although we prefer the former scenario from a pure parsimony standpoint, the latter cannot be ruled out with this dataset. Additionally, a number of studies have documented fluctuations in integration over ontogeny (Cheverud et al 1983;Cheverud and Leamy 1985;Zelditch 1988;Zelditch and Carmichael 1989;Cane 1993;Ackermann 2005;Ivanovic et al 2005), so this question remains open. For example, if these epigenetic factors do not have an effect on integration, then other interactions that do not vary in these groups may have driven the convergence in integrative pattern.…”

Section: Discussionmentioning

confidence: 99%

Epigenetic Effects on Integration of Limb Lengths in a Mouse Model: Selective Breeding for High Voluntary Locomotor Activity

2009

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Mammals exhibit a similar pattern of integration among homologous limb elements, the strength of which is believed to vary in response to selection for functional coordination or similarity. Although integration is hypothesized to primarily reflect the effect of genes intrinsic to limbs, extrinsic genetic or epigenetic factors may also affect the strength of integration through their impact on the magnitude and direction of skeletal variance or covariance. Such factors as neuromuscular coordination or bone-muscle interactions may therefore play a role in both canalization and the structure or magnitude of limb integration. If this were the case, then increased levels of locomotor activity would be predicted to increase canalization and the magnitude of covariation between limbs. To investigate whether postnatal activity levels can have a significant effect on variance within or covariance among homologous limb elements, we compared four groups of male mice from a long-term selective breeding experiment: (1) mice from lines bred for increased voluntary activity on running wheels and allowed free access to a wheel for 8 weeks beginning at weaning (''active''), (2) selected mice that did not have wheel access (''sedentary''), (3) active mice from nonselected control lines, and (4) sedentary control mice. Mice from selected lines that had wheel access ran significantly more than control-line mice. However, when controlled for activity, linetype, and body mass, results indicate few significant differences in means, variance, or covariation structure, and no significant differences in integration between limbs, suggesting that postnatal activity levels do not significantly affect canalization or integration of limb lengths. A possible explanation for this result is that whereas baseline levels of postnatal activity may help to maintain patterns of variance and integration, increased levels of activity do not further increase these measures. Investigations into disrupted epigenetic processes (e.g., via models in which neuromuscular coordination is impaired) are required to further test hypotheses about how canalization or integration of limb variation is affected by epigenetic factors.

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

Cited by 12 publications

References 32 publications

Skull size and shape variation versus molecular phylogeny: a case study of alpine newts (Mesotriton alpestris, Salamandridae) from the Balkan Peninsula

Skull size and shape variation versus molecular phylogeny: a case study of alpine newts (Mesotriton alpestris, Salamandridae) from the Balkan Peninsula

Cranial integration in the fire salamander, Salamandra salamandra (Caudata: Salamandridae)

Epigenetic Effects on Integration of Limb Lengths in a Mouse Model: Selective Breeding for High Voluntary Locomotor Activity

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