Advances in insectivore and rodent systematics due to geometric morphometrics

Barčiová, Lenka

doi:10.1111/j.1365-2907.2009.00139.x

Cited by 21 publications

(11 citation statements)

References 57 publications

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“…However, more modern methods such as geometric morphometrics have proven successful in studies of rodent morphology (Barciova 2009) and are preferable when describing shape variation in highly complex anatomical units such as the skull (MacLeod and Forey 2002). Therefore, we complemented our linear morphometric approach with geometric morphometrics as a powerful means to quantify both size and shape.…”

Section: Geometric Morphometricsmentioning

confidence: 99%

From Desert to Rainforest: Phenotypic Variation in Functionally Important Traits of Bushy-Tailed Woodrats (Neotoma cinerea) Across Two Climatic Extremes

Cordero

Epps

2012

J Mammal Evol

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Changes in body size inversely related to ambient temperatures have been described in woodrats (Neotoma) over time scales ranging from decades to millennia. However, climate-mediated variation in other traits has not been evaluated, and the effects of precipitation have been overlooked. We assessed variation in skull morphology among bushytailed woodrats (Neotoma cinerea) over two sampling transects spanning coastal rainforest and interior desert environments to determine whether skull morphology varied with climate. We also tested whether previously described sizetemperature relationships could be generalized to our study populations. In both transects, linear measurements of functionally significant traits differed between coastal and interior populations. Geometric morphometric analyses of shape confirmed some of those differences and revealed additional patterns of skull variation. Variation in some linear measurements, including body size, was predicted by climate. However, body and skull size, as well as measurements of skull components, displayed varying responses. Although longitudinal patterns of body size variation supported Bergmann's rule, skull size variation was only weakly associated with climate. The strongest phenotypic responses to climate were those of auditory, dental, and palatal skull traits. Altogether, our findings suggest that geographic variation in temperature and precipitation mediated selective heterogeneity and plasticity in skull traits associated with food processing and sensory organs in N. cinerea. This was consistent with our expectation of resource-dependent phenotypic variation among populations in environments with highly contrasting climatic regimes.

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Section: Geometric Morphometricsmentioning

confidence: 99%

From Desert to Rainforest: Phenotypic Variation in Functionally Important Traits of Bushy-Tailed Woodrats (Neotoma cinerea) Across Two Climatic Extremes

Cordero

Epps

2012

J Mammal Evol

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“…As a paradigmatic case, Wagner et al (2013) demonstrated that high-throughput DNA sequence data from restriction site-associated DNA (RAD) markers provide "unprecedented resolution of species boundaries" in Lake Victoria cichlid fish, a group which has yielded conflicting phylogenies due to recent divergence times and shared polymorphisms. Although large morphological differences are not expected in this group of species living in homogeneous underground environments (Ortells 1990), geometric morphology methodologies (Barčiová 2009, Sánchez et al 2013, Ruane 2015 would offer a more detailed analysis of variable characters that could serve as another source of data to re-discuss lineages boundaries in this group.…”

Section: Future Perspectivesmentioning

confidence: 99%

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Caraballo

Rossi

2017

Mammalia

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Abstract:The tuco-tucos rodents (genus Ctenomys) of the Corrientes group comprise several populations that inhabit the vast area under the influence of the Iberá wetland. Lineage delimitation within the recently diverged Corrientes group is a challenging task as morphological differentiation is not conspicuous between populations. However, delimitation is crucial for evolutionary studies and conservation issues. In this study, we performed a phylogenetic analysis including cytochrome b (cyt-b) sequences from taxa that had never been studied in a comprehensive context. We integrated previously published chromosomal studies, mitochondrial phylogenies and simple sequence repeat (SSR) variability analyses, and applied a delimitation criterion over the basis of chromosomal incompatibilities and genetic exclusivity. Under this integrative approach seven independently evolving lineages were delimited in the Corrientes group: Ctenomys roigi, which conserves its former definition, Ctenomys dorbignyi and Ctenomys perrensi complex which were redefined, Sarandicito which includes the population of Paraje Sarandicito and probably a group of nearby poorly studied populations, and Iberá i, ii and iii distributed at both sides of the Iberá wetland. We discuss future perspectives to evaluate the proposed lineages and conservation issues concerning these tuco-tucos.

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“…The detection and description of geographic variation on skull size and shape are important for investigations on mammalian systematics and taxonomy (Barčiová 2009, Yazdi 2011. In relation to rodents, geographically based studies have addressed closely related species (i.e.…”

Section: Introductionmentioning

confidence: 99%

Geographic variation in skull shape of the water rat Scapteromys tumidus (Cricetidae, Sigmodontinae): isolation-by-distance plus environmental and geographic barrier effects?

Quintela

Fornel

Freitas

2016

An. Acad. Bras. Ciênc.

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The geographic variation in skull size and shape of the swamp rat Scapteromys tumidus was examined in samples from eight geographic clusters in almost of its distribution in southern Brazil and Uruguay. For analysis we used two-dimensional geometric morphometric methods for dorsal, ventral and lateral views of the skull. The geometric descriptors showed no signifi cant differences in skull size between geographic clusters, while differences in shape were highly signifi cant. We found a signifi cant and moderate correlation between geographic and morphological distances, corroborating the isolation-by-distance model. Samples from the Rio Grande do Sul central coastal plain were the most differentiated, segregating completely from all other samples in canonical variate analysis for the dorsal view. The most visible variable regions in skull were the zygomatic arch (mainly the squamosal root of zygomatic) and the lateral braincase borders. Once correlation between geographic and morphological distances were not strong, it is possible that other factors (environmental heterogeneity and/or geographic barriers) may are acting in S. tumidus skull differentiation.

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Advances in insectivore and rodent systematics due to geometric morphometrics

Cited by 21 publications

References 57 publications

From Desert to Rainforest: Phenotypic Variation in Functionally Important Traits of Bushy-Tailed Woodrats (Neotoma cinerea) Across Two Climatic Extremes

From Desert to Rainforest: Phenotypic Variation in Functionally Important Traits of Bushy-Tailed Woodrats (Neotoma cinerea) Across Two Climatic Extremes

Integrative lineage delimitation in rodents of the Ctenomys Corrientes group

Geographic variation in skull shape of the water rat Scapteromys tumidus (Cricetidae, Sigmodontinae): isolation-by-distance plus environmental and geographic barrier effects?

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