16 results on '"Klaczko, J."'
Search Results
2. Developmental anomalies in ‘reptiles’: a scoping review
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Dillenburg, G., primary, Pic-Taylor, A., additional, and Klaczko, J., additional
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- 2023
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3. Phenotypic Plasticity
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Luzete, J., primary, Oliveira, I. F., additional, Ferreira, L. A., additional, and Klaczko, J., additional
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- 2021
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4. Hemipenial morphology and diversity in South American anoles (Squamata: dactyloidae)
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D'Angiolella, A.B., Klaczko, J., Rodrigues, M.T., and Avila-Pires, T.C.S.
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Anolis -- Distribution -- Physiological aspects ,Company distribution practices ,Zoology and wildlife conservation - Abstract
Hemipenial morphology has provided useful characters to improve species identification and phylogenetic relationships in squamates. Here we provide hemipenial description and illustration of 13 South American anoles. At generic and specific levels, differences are mainly related to shape and ornamentation; intraspecific variation is low. An asulcate process, present in the hemipenis of most anole species studied, was highly variable among species and may be a useful taxonomic character in hemipenial morphology of this group. Key words: Norops, Dactyloa, South America, hemipenis, male genitalia. La morphologie hemipeniale a fourni des caracteres utiles pour ameliorer l'identification des especes et les relations phylogeniques chez les squamates. Nous presentons des descriptions et illustrations d'hemipenis de 13 anolis sud-americains. Aux niveaux du genre et de l'espece, les differences sont principalement associees a la forme et a l'ornementation, et la variation intraspecifique est faible. Un processus sans sillon, present dans l'hemipenis de la plupart des especes d'anolis etudiees, varie considerablement d'une espece a l'autre et pourrait constituer un caractere taxinomique utile de la morphologie hemipeniale de ce groupe. [Traduit par la Redaction] Mots-cles: Norops, Dactyloa, Amerique du Sud, hemipenis, organes genitaux males., Introduction Morphology of male genitalia provide helpful taxonomic characters in many groups of vertebrates and invertebrates (Keogh 1999; Lupold et al. 2004; Yoshizawa and Johnson 2006; Kohler et al. 2007; [...]
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- 2016
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5. Patterns of cranial shape diversification during the phylogenetic branching process of New World monkeys (Primates: Platyrrhini)
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PEREZ, S. I., KLACZKO, J., ROCATTI, G., and Dos REIS, S. F.
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- 2011
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6. Hemipenial morphology and diversity in South American anoles (Squamata: Dactyloidae)
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D’Angiolella, A.B., primary, Klaczko, J., additional, Rodrigues, M.T., additional, and Avila-Pires, T.C.S., additional
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- 2016
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7. Patterns of cranial shape diversification during the phylogenetic branching process of New World monkeys (Primates: Platyrrhini)
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Perez, Sergio Ivan, Klaczko, J., Rocatti, Guido, and dos Reis, S.F.
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Ciencias Biológicas ,comparative studies ,morphometrics ,semilandmarks ,Biología ,ecological axes ,natural selection ,body size ,molecular phylogeny ,CIENCIAS NATURALES Y EXACTAS - Abstract
One of the central topics in evolutionary biology is understanding the processes responsible for phenotypic diversification related to ecological factors. New World monkeys are an excellent reference system to investigate processes of diversification at macroevolutionary scales. Here, we investigate the cranial shape diversification related to body size and ecology during the phylogenetic branching process of platyrrhines. To investigate this diversification, we used geometric morphometric techniques, a molecular phylogenetic tree, ecological data and phylogenetic comparative methods. Our statistical analyses demonstrated that the phylogenetic branching process is the most important dimension to understand cranial shape variation among extant platyrrhines and suggested that the main shape divergence among the four principal platyrrhine clades probably occurred during the initial branching process. The phylogenetic conservatism, which is the retention of ancestral traits over time within the four principal platyrrhine clades, could be the most important characteristic of platyrrhine cranial shape diversification. Different factors might have driven early shape divergence and posterior relative conservatism, including genetic drift, stabilizing selection, genetic constraints owing to pleiotropy, developmental or functional constraint, lack of genetic variation, among others. Understanding the processes driving the diversification among platyrrhines will probably require further palaeontological, phylogenetic and comparative studies. Fil: Perez, Sergio Ivan. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Klaczko, J.. Universidade Estadual de Campinas; Brasil Fil: Rocatti, Guido. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina Fil: dos Reis, S.F.. Universidade Estadual de Campinas; Brasil
- Published
- 2011
8. Genitals evolve faster than other traits inAnolis lizards
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Klaczko, J., primary, Ingram, T., additional, and Losos, J., additional
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- 2015
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9. Genitals evolve faster than other traits in A nolis lizards.
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Klaczko, J., Ingram, T., and Losos, J.
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GENITALIA , *LIZARDS , *ANIMAL morphology , *BIOLOGICAL evolution , *PHYLOGENY , *ANOLES - Abstract
Male genitalia are thought to be particularly rapidly evolving morphological structures, but there have been few quantitative interspecific comparisons between the evolutionary rates of genital and nongenital traits. We characterize the morphology of hemipenes in 25 Caribbean A nolis lizard species, and compare rates of hemipenial evolution to those of traits related to ecology or visual signaling. Using phylogenetically based comparisons of rates of evolutionary divergence, we show that genital traits evolve more rapidly than nongenital traits in anoles. [ABSTRACT FROM AUTHOR]
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- 2015
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10. Higher-level molecular phylogeny of snakes: Conflicts and congruence
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Grazziotin, F. G., Hussam Zaher, Ferrarezzi, H., Klaczko, J., Bonatto, S. L., and Wilkinson, M.
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lcsh:Biology (General) ,lcsh:Botany ,lcsh:Q ,lcsh:Science ,lcsh:QH301-705.5 ,lcsh:QK1-989
11. Effects of incubation temperature on development, morphology, and thermal physiology of the emerging Neotropical lizard model organism Tropidurus torquatus.
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De-Lima AKS, de Oliveira CH, Pic-Taylor A, and Klaczko J
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- Animals, Climate Change, Ecosystem, Female, Global Warming, Temperature, Lizards physiology
- Abstract
Incubation temperature is among the main phenotypic trait variation drivers studied since the developmental trajectory of oviparous animals is directly affected by environmental conditions. In the last decades, global warming predictions have aroused interest in understanding its impacts on biodiversity. It is predicted that the effects of direct warming will be exacerbated by other anthropogenic factors, such as microclimatic edge effects. Although the Brazilian Cerrado biome is one of the most affected by these issues, little is known about the aforementioned effects on its biodiversity. Therefore, the aim of our study is to investigate the influence of incubation temperature on developmental parameters, morphology and thermal physiology traits of the collared lizard (Tropidurus torquatus). Furthermore, we discuss our findings regarding lizard developmental biology and the climate change paradigm. Therefore, we incubated T. torquatus eggs under five temperature regimes ranging from artificial nest temperature (28.7 °C) to 35.0 °C. We found that elevated incubation temperatures affect several investigated traits: egg mass gain is positively affected, without any influence in newborn mass; incubation period is broadly reduced with temperature increase; survival rate is negatively affected by temperature, constant 35.0 °C regime is confirmed as a lethal incubation temperature, and the sex ratio is affected at 30.0 °C, with a prevailing outbreak of females. Increased incubation temperature also affects body and head size but has no effect on limb size. Newborn thermoregulation and the critical thermal maximum (CT
max ) are not affected by incubation temperature. On the other hand, basal body temperature (Tbb ) and the critical thermal minimum (CTmin ) were positively affected. Thermal physiology was also affected by age, with newborns differing from adults for all analyzed thermal traits. Our findings indicate that future modifications in incubation temperature regimes at nesting sites caused by warming may affect several features of the development, morphology, and thermal physiology of newborns of this species. Laboratory experiments have pointed to possible drastic effects of warming on lizard survival rates, also affecting aspects of its natural history and population distribution. Moreover, in addition to being more vulnerable than adults in aspects such as predation and feeding, T. torquatus newborns are also more vulnerable regarding thermal physiological traits., (© 2022. The Author(s).)- Published
- 2022
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12. Sexual dimorphism and allometry in malacophagus snakes (Dipsadidae: Dipsadinae).
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Dos Santos MM, Klaczko J, and da Costa Prudente AL
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- Animals, Body Size, Female, Head, Male, Skull anatomy & histology, Sex Characteristics, Snakes
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Sexual dimorphism in snakes is generally described in association with body or tail size and scale counts, with relatively few studies addressing intrasexual divergence in the skull. Here, we analyzed sexual dimorphism in the size and shape of skull and body in three malacophagous dipsadine snakes, Dipsas mikanii, Dipsas neuwiedi and Dipsas turgida, as well as allometric effect on these components. We used linear and geometric analysis to assess: (1) if there is sexual dimorphism in cranial components; (2) if there are differences between the sexes regarding body and tail size, number of ventral and subcaudal scales; (3) whether there is covariation between cranial components and body size; (4) if there are changes in cranial shape associated with increased size; and (5) whether there is an allometric relationship between body and tail size. Our results showed that all three species are dimorphic in cranial shape and size (except D. turgida for cranial size), with females having longer and thinner skulls than males. In the three species, the female skull was negatively allometric, whereas the male skull was isometric. Allometry related to cranial shape was significant only in males of D. turgida, which showed greater snout robustness and eye size associated with enlargement of the skull. Females of D. mikanii and D. neuwiedi were significantly larger than males. Only males of D. neuwiedi showed positive allometry for the tail, while dimorphism related to scale counts followed the pattern found in most snakes, with females having a greater number of ventrals and males subcaudals (except D. neuwiedi in the latter case). Based on our results, we hypothesize that patterns of sexual dimorphism and skull allometry in malacophagous snakes may be explained both by aspects related to diet and reproduction. Meanwhile, patterns associated with body size reflect advantages related to fecundity favoring greater reproductive success of females., (Copyright © 2022 Elsevier GmbH. All rights reserved.)
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- 2022
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13. Are hemipenial traits under sexual selection in Tropidurus lizards? Hemipenial development, male and female genital morphology, allometry and coevolution in Tropidurus torquatus (Squamata: Tropiduridae).
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De-Lima AKS, Paschoaletto IP, Pinho LO, Benmamman P, and Klaczko J
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- Animals, Biological Evolution, Female, Genitalia, Female growth & development, Genitalia, Male growth & development, Lizards anatomy & histology, Male, Phylogeny, Selection, Genetic, Sexual Behavior, Genitalia, Female anatomy & histology, Genitalia, Male anatomy & histology, Lizards growth & development
- Abstract
Male genitalia show considerable morphological variation among animals with internal fertilization and exhibit a high level of evolvability in lizards. Studies have suggested that sexual selection may be driving hemipenial evolution against natural selection and pleiotropy. Given the direct interaction of male and female genitals, coevolution of the aforementioned is posited by several hypotheses of genital evolution. However, there are only a few studies on female genitalia morphology, resulting in a lack of coevolution description and understanding. Studies of allometric patterns have filled some gaps by answering questions about male genital evolution and could prove a powerful tool in clarifying coevolution between male and female genitals. Here, we studied the genital morphology of Tropidurus torquatus. This Tropidurus lizard species is an emerging Neotropical lizard model organism notable for having enlarged hemipenial lobes in contrast with other tropidurid species. In this study, we analyzed hemipenial development in early and late stages, describing both morphological variation and ontogenetic allometric pattern. We used quantitative traits to describe male and female genital morphology, examining their static allometric patterns and correspondence. Our study provides a quantitative discussion on the evolution of lizard genitals, suggesting that sexual selection plays an important role in genital evolution in Tropidurus lizards., Competing Interests: The authors have declared that no competing interests exist.
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- 2019
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14. Are Diet Preferences Associated to Skulls Shape Diversification in Xenodontine Snakes?
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Klaczko J, Sherratt E, and Setz EZ
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- Anatomic Landmarks, Animals, Phylogeny, Predatory Behavior, Choice Behavior, Colubridae anatomy & histology, Diet, Skull anatomy & histology
- Abstract
Snakes are a highly successful group of vertebrates, within great diversity in habitat, diet, and morphology. The unique adaptations for the snake skull for ingesting large prey in more primitive macrostomatan snakes have been well documented. However, subsequent diversification in snake cranial shape in relation to dietary specializations has rarely been studied (e.g. piscivory in natricine snakes). Here we examine a large clade of snakes with a broad spectrum of diet preferences to test if diet preferences are correlated to shape variation in snake skulls. Specifically, we studied the Xenodontinae snakes, a speciose clade of South American snakes, which show a broad range of diets including invertebrates, amphibians, snakes, lizards, and small mammals. We characterized the skull morphology of 19 species of xenodontine snakes using geometric morphometric techniques, and used phylogenetic comparative methods to test the association between diet and skull morphology. Using phylogenetic partial least squares analysis (PPLS) we show that skull morphology is highly associated with diet preferences in xenodontine snakes.
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- 2016
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15. Species tree estimation for a deep phylogenetic divergence in the New World monkeys (Primates: Platyrrhini).
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Perez SI, Klaczko J, and dos Reis SF
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- Animals, Bayes Theorem, Models, Genetic, Monte Carlo Method, Platyrrhini genetics, Evolution, Molecular, Phylogeny, Platyrrhini classification
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The estimation of a robust phylogeny is a necessary first step in understanding the biological diversification of the platyrrhines. Although the most recent phylogenies are generally robust, they differ from one another in the relationship between Aotus and other genera as well as in the relationship between Pitheciidae and other families. Here, we used coding and non-coding sequences to infer the species tree and embedded gene trees of the platyrrhine genera using the Bayesian Markov chain Monte Carlo method for the multispecies coalescent (*BEAST) for the first time and to compared the results with those of a Bayesian concatenated phylogenetic analysis. Our species tree, based on all available sequences, shows a closer phylogenetic relationship between Atelidae and Cebidae and a closer relationship between Aotus and the Cebidae clade. The posterior probabilities are lower for these conflictive tree nodes compared to those in the concatenated analysis; this finding could be explained by some gene trees showing no concordant topologies between Aotus and the other genera. Moreover, the topology of our species tree also differs from the findings of previous molecular and morphological studies regarding the position of Aotus. The existence of discrepancies between morphological data, gene trees and the species tree is widely reported and can be related to processes such as incomplete lineage sorting or selection. Although these processes are common in species trees with low divergence, they can also occur in species trees with deep and rapid divergence. The sources of the inconsistency of morphological and molecular traits with the species tree could be a main focus of further research on platyrrhines., (Copyright © 2012 Elsevier Inc. All rights reserved.)
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- 2012
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16. Molecular phylogenetic relationships and phenotypic diversity in miniaturized toadlets, genus Brachycephalus (Amphibia: Anura: Brachycephalidae).
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Clemente-Carvalho RB, Klaczko J, Ivan Perez S, Alves AC, Haddad CF, and dos Reis SF
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- Animals, Base Sequence, Bayes Theorem, Brazil, DNA, Mitochondrial genetics, DNA, Ribosomal genetics, Evolution, Molecular, Mitochondria genetics, Molecular Sequence Data, Multilocus Sequence Typing, Phenotype, Phylogeny, RNA, Ribosomal, 16S genetics, Sequence Analysis, DNA, Skull anatomy & histology, Species Specificity, Anura anatomy & histology, Anura classification, Anura genetics, Biological Evolution
- Abstract
Toadlets of the genus Brachycephalus are endemic to the Atlantic rainforests of southeastern and southern Brazil. The 14 species currently described have snout-vent lengths less than 18 mm and are thought to have evolved through miniaturization: an evolutionary process leading to an extremely small adult body size. Here, we present the first comprehensive phylogenetic analysis for Brachycephalus, using a multilocus approach based on two nuclear (Rag-1 and Tyr) and three mitochondrial (Cyt b, 12S, and 16S rRNA) gene regions. Phylogenetic relationships were inferred using a partitioned Bayesian analysis of concatenated sequences and the hierarchical Bayesian method (BEST) that estimates species trees based on the multispecies coalescent model. Individual gene trees showed conflict and also varied in resolution. With the exception of the mitochondrial gene tree, no gene tree was completely resolved. The concatenated gene tree was completely resolved and is identical in topology and degree of statistical support to the individual mtDNA gene tree. On the other hand, the BEST species tree showed reduced significant node support relative to the concatenate tree and recovered a basal trichotomy, although some bipartitions were significantly supported at the tips of the species tree. Comparison of the log likelihoods for the concatenated and BEST trees suggests that the method implemented in BEST explains the multilocus data for Brachycephalus better than the Bayesian analysis of concatenated data. Landmark-based geometric morphometrics revealed marked variation in cranial shape between the species of Brachycephalus. In addition, a statistically significant association was demonstrated between variation in cranial shape and genetic distances estimated from the mtDNA and nuclear loci. Notably, B. ephippium and B. garbeana that are predicted to be sister-species in the individual and concatenated gene trees and the BEST species tree share an evolutionary novelty, the hyperossified dorsal plate., (Copyright © 2011 Elsevier Inc. All rights reserved.)
- Published
- 2011
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