Fabio Andrade Machado

Fabio Andrade Machado
Virginia Tech (Virginia Polytechnic Institute and State University) | VT · Department of Biological Sciences

PhD

About

85
Publications
47,894
Reads
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513
Citations
Citations since 2017
69 Research Items
391 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
Additional affiliations
February 2012 - February 2017
University of São Paulo
Position
  • PhD
Education
January 2007 - December 2010
Museu de Zoologia
Field of study
  • Morphometrics and Evolution
March 2002 - June 2006
Instituto Butantan
Field of study
  • Animal Behavior and cladistics

Publications

Publications (85)
Article
Full-text available
Morphological integration refers to the fact that different phenotypic traits of organisms are not fully independent from each other, and tend to covary to different degrees. The covariation among traits is thought to reflect properties of the species' genetic architecture and thus can have an impact on evolutionary responses. Furthermore, if morph...
Article
Full-text available
The association between phenotype and ecology is essential for understanding the environmental drivers of morphological evolution. This is a particularly challenging task when dealing with complex traits, such as the skull, where multiple selective pressures are at play and evolution might be constrained by ontogenetic and genetic factors. I integr...
Article
The prevalence of stasis on macroevolution has been classically taken as evidence of the strong role of stabilizing selection in constraining morphological change. Rates of evolution calculated over longer timescales tend to fall below the expected under genetic drift, suggesting that directional selection signals are erased at longer timescales. H...
Article
Full-text available
The magnitude of morphological integration is a major aspect of multivariate evolution, providing a simple measure of the intensity of association between morphological traits. Studies concerned with morphological integration usually translate phenotypes into morphometric representations to quantify how different morphological elements covary. Geom...
Article
Full-text available
The Drosophila wing is a structure shared by males and females with the primary function of flight. However, in males, wings are also used to produce songs or visual displays during courtship. Understanding the genetic architecture underlying wing variation within and between the sexes is central to predicting the possible outcomes of evolutionary...
Article
How covariance patterns of phenotypes change during development is fundamental for a broader understanding of evolution. There is compelling evidence that mammalian cranium covariance patterns change during ontogeny. However, it is unclear to what extent variation in covariance patterns during ontogeny can impact the response to selection. To tackl...
Article
We present a taxonomic revision of maned sloths, subgenus Bradypus (Scaeopus), a taxon endemic to the Brazilian Atlantic Forest and currently composed of a single species, the vulnerable Bradypus torquatus. Our review is based on coalescent species delimitation analyses using mitochondrial and nuclear DNA, morphological analyses, and field observat...
Article
A central challenge for biology is to reveal how different levels of biological variation interact and shape diversity. However, recent experimental studies have indicated that prevailing models of evolution cannot readily explain the link between micro‐ and macroevolution at deep time scales. Here, we suggest that this paradox could be the result...
Preprint
Full-text available
Studies of macroevolution have classically rejected the notion that large-scale divergence patterns can be explained through populational, microevolutionary models. For morphology, this consensus partly derives from the inability of quantitative genetics models to correctly predict the behavior of evolutionary processes at the scale of millions of...
Article
The taxonomy of the South American river dolphins of the genus Inia has been a focus of intense debate. While traditionally it is thought to be composed of a single species with three geographically structured subspecies (Inia geoffrensis geoffrensis, I. g. humboldtiana, and I. g. boliviensis), recent molecular studies have highlighted substantial...
Preprint
Full-text available
Understanding how development changes the genetic covariance of complex phenotypes is fundamental for the study of evolution. If the genetic covariance changes dramatically during postnatal ontogeny, one cannot infer confidently evolutionary responses based on the genetic covariance estimated from a single postnatal ontogenetic stage. Mammalian sku...
Preprint
Full-text available
The prevalence of stasis on paleontological and comparative data has been classically taken as evidence of the strong role of stabilizing selection in shaping morphological evolution. When confronted against biologically informed predictions, empirical rates of evolution tend to fall below what is expected under genetic drift, suggesting that the s...
Preprint
Full-text available
The Drosophila wing is a structure shared by males and females with the main function of flight. However, in males, wings are also used to produce songs, or visual displays during courtship. Thus, observed changes in wing phenotype depend on the interaction between sex-specific selective pressures and the genetic and ontogenetic restrictions impose...
Article
Full-text available
Understanding the interplay between morphological integration and modularity is considered an important topic in the study of the evolution of the form of complex structures. The mandible is a complex structure that can be shaped by diverse factors such as ontogeny, ecology, and evolutionary history. In canids, this is particularly interesting beca...
Article
Researchers are increasingly using museum collections for taxonomy, systematics, phylogenetics, and faunal analyses, and they assume that taxonomic identifications on museum labels are correct. However, identifications may be incorrect or out of date, which could result in false conclusions from subsequent research. A recent geometric morphometrics...
Article
Full-text available
We conducted a geometric morphometric analysis to investigate the morphological variation of the golden wolf, Canis lupaster, and to clarify the morphological and taxonomic affinities of different taxa of the genera Canis and Lupulella. We suggest that the variation observed within the complex of Canis lupaster may be incompatible with what would b...
Article
Full-text available
Gal apagos snakes are among the least studied terrestrial vertebrates of the Archipelago. Here, we provide a phylogenetic analysis and a time calibrated tree for the group, based on a sampling of the major populations known to occur in the Archipelago. Our study revealed the presence of two previously unknown species from Santiago and R abida Islan...
Article
Full-text available
The cover image, by Fernanda Magalhães Silva et al., is based on the Original Article Aquatic adaptations in a Neotropical coral snake: A study of morphological convergence, DOI: 10.1111/jzs.12202. Photo credit: Diego Meneghelli.
Cover Page
Full-text available
Coyote at Yosemite Park. Courtesy of Diego Ástua
Cover Page
Full-text available
The cover image, by Fernanda Magalhães Silva et al., is based on the Original Article Aquatic adaptations in a Neotropical coral snake: A study of morphological convergence. Photo credit: Diego Meneghelli.
Article
Full-text available
The taxonomy of Cyclopes didactylus is marked by a confusing history of new names, with few or no references to types, and new subspecies without any verified geographic correspondence. Here, we review the taxonomy of the genus Cyclopes using an integrative approach that combines morphological, morphometric and molecular data. We, therefore, aim to...
Article
Full-text available
Micrurus surinamensis is an aquatic member of the genus Micrurus. This species is known for its highly specialized venom and distinctive diet, mostly made of aquatic vertebrates. Here, we explore both external (head and body) and skull shape morphologies in M. surinamensis, comparing it with two terrestrial species of the genus (M. lemniscatus and...
Article
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[ Proc. R. Soc. B 283 , 20161783 (Published Online 26 October 2016) ([doi:10.1098/rspb.2016.1783][2])][2] Table 1 of vector correlations presented in Simon et al. [[1][2]] is incorrect. The following headings of the table columns [Δ z × PC1], [PC1 × β ] and [ β × most selected axis] do not
Article
Full-text available
Interactions among traits that build a complex structure may be represented as genetic covariation and correlation. Genetic correlations may act as constraints, deflecting the evolutionary response from the direction of natural selection. We investigated the relative importance of drift, selection, and constraints in driving skull divergence in a g...
Article
Neotropical “goo-eating” dipsadine snakes display a set of morphological and histo-chemical adaptations linked to the capture of their soft-bodied, viscous invertebrate prey. Within this group, species from the genus Sibynomorphus feed chiefly on snails and slugs. Here, we analyzed a series of skull and mandible characters in S. mikanii, S. neuwied...
Article
Full-text available
Tropidurus Wied, 1825, is one of the most ubiquitous lizard genera distributed in open habitats of tropical and subtropical South America. Nevertheless, the broad representation of specimens of this group in scientific collections is hardly reflected in our knowledge of its taxo- nomic diversity. Most species currently assigned to Tropidurus began...
Poster
Full-text available
Evolutionary constraints are properties of populations that hinder the generation of variation of a given kind or bias the production of variants on a given direction. The interaction between constraints and the adaptive regime of a population can lead to different evolutionary outcomes, thus being important in the understanding of macroevolutionar...
Article
Full-text available
Increasing public interest in science information in a digital and 2.0 science era promotes a dramatically, rapid and deep change in science itself. The emergence and expansion of new technologies and internet-based tools is leading to new means to improve scientific methodology and communication, assessment, promotion and certification. It allows...
Data
Research Blogging Reports raw data. Excel spreadsheet with Research Blogging data from November 1, 2007 until December 31, 2011. Sheet S1-A: RB Blog Report with blog name, blog URL, status, Research Blogging topic, number of posts and blog language. Sheet S1-B: RB Citations Report with publication date, post title, number of views, blog name, DOI,...
Article
Full-text available
Mesoclemmys heliostemma (Testudines: Chelidae) was described based on five vouchered specimens and nine live specimens from the western Amazon basin. Some authors questioned its status as a valid species, suggesting that it represents a junior synonym of M. raniceps. Here, we report on eight additional specimens from eastern Peru and northern Brazi...
Article
Full-text available
Despite the fact that heterochronic processes seem to be an important process determining morphological evolution of the delphinid skull, previous workers have not found allometric scaling as relevant factor in the differentiation within the genus Sotalia. Here we analyzed the skull ontogeny of the estuarine dolphin S. guianensis and investigate di...
Article
Full-text available
the snake oxyrhopus clathratus, which has a restricted distribution within the atlantic forest domain, exhibits great variability in color pattern, shape of the hemipenis, and scalation. the extent of variation has resulted in substantial taxonomic con‐ fusion. to date, identification and recognition are problematic, and this is reflected in the sy...
Article
Full-text available
Spiders are considered conservative with regard to their resting metabolic rate, presenting the same allometric relation with body mass as the majority of land-arthropods. Nevertheless, web-building is thought to have a great impact on the energetic metabolism, and any modification that affects this complex behavior is expected to have an impact ov...
Article
Full-text available
Many of the controversies around the concept of homology rest on the subjectivity inherent to primary homology propositions. Dynamic homology partially solves this problem, but there has been up to now scant application of it outside of the molecular domain. This is probably because morphological and behavioural characters are rich in properties, c...