Cranial divergence among evolutionary lineages of Martino's vole,<i>Dinaromys bogdanovi</i>, a rare Balkan paleoendemic rodent

Kryštufek, Boris; Klenovšek, Tina; Bužan, Elena; Loy, Anna; Janžekovič, Franc

doi:10.1644/11-mamm-a-260.2

Cited by 10 publications

(13 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A rare paleoendemic vole, Martino's vole, Dinaromys bogdanovi (Martino and Martino, 1922) is the only living member of the genus Dinaromys occupying a small, fragmented range in the western Balkans (Kryštufek and Bužan, 2008). Both mitochondrial (Kryštufek et al, 2007(Kryštufek et al, , 2012 and microsatellite (Bužan et al, 2010) DNA analyses revealed three allopatric phylogenetic groups (from the Northwestern, Central and Southeastern part of the species range) within the species, whereas geometric morphometric analyses of cranial shape variation (Kryštufek et al, 2012) retrieved significant differences among these phylogenetic groups. In general, voles are short-lived, proliferating rodents, which rarely survive for longer than two years.…”

Section: Introductionmentioning

confidence: 98%

Modularity and cranial integration across ontogenetic stages in Martino’s vole, Dinaromys bogdanovi

Klenovšek

Jojić

2016

CTOZ

Self Cite

View full text Add to dashboard Cite

We explored modularity and morphological integration of the ventral cranium during postnatal ontogeny in Martino’s vole (Dinaromys bogdanovi). Two closely related phylogenetic groups, originating from the Central and Southeastern part of the species range in the western Balkans, were considered. As expected, both phylogroups had similar patterns of ontogenetic changes in cranial size and shape variation, modularity and integration. At the level of within individual variation, the hypothesis that the viscerocranial and neurocranial regions are separate modules was rejected, indicating that the hypothesized modules are not developmental, but rather functional. At the level of among individual variation, the viscerocranium and the neurocranium could not be recognized as separate modules at the juvenile stage. The strength of association between the hypothesized modules becomes lower with age which finally results in a clear 2-module organization of the ventral cranium at the adult stage. On the other hand, patterns of morphological integration for the cranium as a whole, the viscerocranium and the neurocranium stay consistent across ontogenetic stages. The developmental mechanism producing integration of the cranium as a whole, as well as integration of the neurocranium, varies throughout postnatal ontogeny. In contrast, we detected the ontogenetic stability of the mechanism responsible for covariation of viscerocranial traits which could provide ongoing flexibility of the viscerocranial covariance structure for high functional demands during lifetime. Findings from our study most likely support the idea of the ‘palimpsest-like’ model of covariance structure. Moreover, similarity or dissimilarity in the patterns of within and among individual variation in different sets of analyzed traits and comparisons across ontogenetic stages demonstrate how studies on small mammals other than mice can give new insights into postnatal cranial development.

show abstract

Section: Introductionmentioning

confidence: 98%

Modularity and cranial integration across ontogenetic stages in Martino’s vole, Dinaromys bogdanovi

Klenovšek

Jojić

2016

CTOZ

Self Cite

View full text Add to dashboard Cite

show abstract

“…This drift in morphology explained most of the global variation in human cranial shape and size when isolation‐by‐distance was taken into account (Betti, Balloux, Hanihara, & Manica, 2010). Drift also explained ventral cranial differences across the range of Martino's vole ( Dinaromys bogdanovi ; Kryštufek, Klenovšek, Bužan, Loy, & Janžekovič, 2012). While many studies test for drift, there are few examples that failed to reject the null model; thus, it is unclear to what extent these results may be publication bias or a function of the true prevalence of this evolutionary process within the systems investigated.…”

Section: Introductionmentioning

confidence: 99%

Variation in brown rat cranial shape shows directional selection over 120 years in New York City

Puckett

Sherratt

Combs

et al. 2020

Ecology and Evolution

View full text Add to dashboard Cite

Urbanization exposes species to novel environments and selection pressures that may change morphological traits within a population. We investigated how the shape and size of crania and mandibles changed over time within a population of brown rats (Rattus norvegicus) living in Manhattan, New York, USA, a highly urbanized environment. We measured 3D landmarks on the cranium and mandible of 62 adult individuals sampled in the 1890s and 2010s. Static allometry explained approximately 22% of shape variation in crania and mandible datasets, while time accounted for approximately 14% of variation. We did not observe significant changes in skull size through time or between the sexes. Estimating the P‐matrix revealed that directional selection explained temporal change of the crania but not the mandible. Specifically, rats from the 2010s had longer noses and shorter upper molar tooth rows, traits identified as adaptive to colder environments and higher quality or softer diets, respectively. Our results highlight the continual evolution to selection pressures. We acknowledge that urban selection pressures impacting cranial shape likely began in Europe prior to the introduction of rats to Manhattan. Yet, our study period spanned changes in intensity of artificial lighting, human population density, and human diet, thereby altering various aspects of rat ecology and hence pressures on the skull.

show abstract

“…Contrary to the present results on the European snow vole, size is seemingly stable among deeply divergent phylogenetic lineages of another rock‐dwelling rodent, Martino's vole Dinaromys bogdanovi (Martino & Martino, 1922). This was attributed to the narrow limits of the adaptive zone occupied by Martino's vole, where strong pressures of stabilizing selection for the normative (intermediate) phenotype impose severe limits on its phenotypic variation, including variation in size (Kryštufek et al ., ). Contrasting patterns of size change between the two rock‐occupying arvicolines may be indicative of ecological differences beyond the identical narrow niche component of their shelter.…”

Section: Discussionmentioning

confidence: 97%

“…This was attributed to the narrow limits of the adaptive zone occupied by Martino's vole, where strong pressures of stabilizing Fig. 1 and Table 1. selection for the normative (intermediate) phenotype impose severe limits on its phenotypic variation, including variation in size (Kryštufek et al, 2012). Contrasting patterns of size change between the two rock-occupying arvicolines may be indicative of ecological differences beyond the identical narrow niche component of their shelter.…”

Section: Variability In Sizementioning

confidence: 99%

Captured in ‘continental archipelago’: phylogenetic and environmental framework of cranial variation in the European snow vole

et al. 2015

View full text Add to dashboard Cite

Fragmented landscapes entail important consequences for the evolution of the species confined to them. Isolation of population fragments accelerates selection for narrow local conditions and facilitates morphological divergence. Throughout its range, the European snow vole Chionomys nivalis is restricted to fractured, rocky substrate in mountain regions, which is naturally fragmented into 'continental archipelagos'. Consequently, its extensive morphological and genetic diversity was categorized into about 20 traditional subspecies and at least eight allopatric phylogenetic lineages. In this study, we aimed toward an integrative understanding of cranial variation throughout the European snow vole range. We analyzed seven linear cranial variables on 326 adult skulls from 27 populations belonging to eight phylogenetic lineages. We confirmed significant variation among the fragmented populations but retrieved little meaningful patterning in morphometric variability. Phenetic distances among populations were not related to the phylogenetic architecture of the species, and traditional subspecies were at odds with morphologically diagnosable populations. The lack of an association between morphometric and geographic distances argued against isolation by distance. Furthermore, mean size did not correlate with climatic variables. Morphological principal components 2 and 3 (loaded by the interorbital width and length of neurocranium, respectively) correlated significantly with geographic coordinates and climatic variables. Shape variables discriminated between the abulensis and nivalis phylogroups, and the European and Asiatic populations, but the largest phylogroups (nivalis and malyi) showed high interpopulation heterogeneity and classification accuracy was low. We suggest that cranial shape or size do not incorporate a signal that is strong enough to be of reliable use for subspecific taxonomy. Skull is seemingly prone to vary according to narrow local conditions, which distorts the underlying phylogenetic signal. A small-scale approach, with detailed knowledge of environmental parameters within each habitat fragment, might be more appropriate for a species whose range is actually a continental archipelago.

show abstract

Cranial divergence among evolutionary lineages of Martino's vole,Dinaromys bogdanovi, a rare Balkan paleoendemic rodent

Cited by 10 publications

References 29 publications

Modularity and cranial integration across ontogenetic stages in Martino’s vole, Dinaromys bogdanovi

Modularity and cranial integration across ontogenetic stages in Martino’s vole, Dinaromys bogdanovi

Variation in brown rat cranial shape shows directional selection over 120 years in New York City

Captured in ‘continental archipelago’: phylogenetic and environmental framework of cranial variation in the European snow vole

Contact Info

Product

Resources

About