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Lucas J. Legendre
Indiana Statewide Testing for Educational Progress-Plus
11Publications
6H-index
98Citations
Publications 11
Newest
#1Julien Benoit (University of the Witwatersrand)H-Index: 5
#2Lucas J. Legendre (University of Texas at Austin)
Last.Paul R. Manger (University of the Witwatersrand)H-Index: 32
view all 6 authors...
As the largest and among the most behaviourally complex extant terrestrial mammals, proboscideans (elephants and their extinct relatives) are iconic representatives of the modern megafauna. The timing of the evolution of large brain size and above average encephalization quotient remains poorly understood due to the paucity of described endocranial casts. Here we created the most complete dataset on proboscidean endocranial capacity and analysed it using phylogenetic comparative methods and ance...
#1Jessica Mitchell (University of Bonn)H-Index: 3
#2Lucas J. LegendreH-Index: 6
Last.Jorge Cubo (University of Paris)H-Index: 20
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The furcula is a specialized bone in birds involved in flight function. Its morphology has been shown to reflect different flight styles from soaring/gliding birds, subaqueous flight to high-frequency flapping flyers. The strain experienced by furculae can vary depending on flight type. Bone remodeling is a response to damage incurred from different strain magnitudes and types. In this study, we tested whether a bone microstructural feature, namely Haversian bone density, differs in birds with d...
#1Lucas J. Legendre (UPMC: Pierre-and-Marie-Curie University)H-Index: 6
#2GuénardGuillaume (UdeM: Université de Montréal)H-Index: 8
Last.Jorge Cubo (UPMC: Pierre-and-Marie-Curie University)H-Index: 20
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Metabolic heat production in archosaurs has played an important role in their evolutionary radiation during the Mesozoic, and their ancestral metabolic condition has long been a matter of debate in systematics and palaeontology. The study of fossil bone histology provides crucial information on bone growth rate, which has been used to indirectly investigate the evolution of thermometabolism in archosaurs. However, no quantitative estimation of metabolic rate has ever been performed on fossils us...
#1François J. Meunier (CNRS: Centre national de la recherche scientifique)H-Index: 20
#2Lucas J. Legendre (University of Paris)H-Index: 6
Last.Armand de Ricqlès (University of Paris)H-Index: 21
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The research group known as “Formations squelettiques” team, specialized in the study of mineralized tissues of vertebrates, has been active for 40 years, starting in 1968. In this paper, we review the history of this group from its most remote roots – the original chair of Comparative Anatomy at the Faculty of Sciences in Paris – and explain its specialization in the study of bone histology during the second half of the 20th century. Many techniques were developed in the lab over these decades,...
#1Armand de Ricqlès (University of Paris)H-Index: 21
#2Estelle Bourdon (Wild Center)H-Index: 7
Last.Jorge Cubo (University of Paris)H-Index: 20
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Abstract Aepyornis , a giant subfossil ratite from Madagascar, shows a well-preserved bone histology. Hindlimb bones exhibit an extensive histodiversity; the cortex is initially made of fibrolamellar, well-vascularized primary bone that modulates locally into plexiform or laminar patterns. Lines of arrested growth are generally weakly expressed. Haversian reconstruction can be complete. Perimedullar endosteal deposition is variable but can be extensive. The complex causality (phylogenetic, syste...
#1Lucas J. LegendreH-Index: 6
Archosaurs are a clade of vertebrates that includes birds, crocodiles, and numerous fossil groups. This clade has been a matter of debate among paleontologists for decades concerning the evolution of thermometabolism in its different lineages. The classical hypothesis considers that only modern birds are true endotherms, whereas all other archosaurs are ectotherms. Bone histology allows to study several traits linked to bone growth rate and thermometabolism, otherwise impossible to estimate on f...
#1Jorge Cubo (University of Paris)H-Index: 20
#2Jéromine Baudin (University of Paris)H-Index: 1
Last.Vivian de Buffrénil (University of Paris)H-Index: 22
view all 5 authors...
Periosteal, endosteal, and intracortical blood vessels bring oxygen and nutrients to, and evacuate the metabolic by-products from, osteocytes. This vascular network is in communication with bone cells through a network of canaliculi containing osteocyte cytoplasmic processes. The geometric and physiological constraints involved in the relationships between osteocytes (including canaliculi) and blood vessels in bones remain poorly documented from a comparative point of view. Therefore, first of a...
#1Lucas J. Legendre (University of Paris)H-Index: 6
#2Estelle Bourdon (Wild Center)H-Index: 7
Last.Jorge Cubo (University of Paris)H-Index: 20
view all 7 authors...
The presence of a phylogenetic signal in the variation of osteohistological features has been recently debated in the literature. Previous studies have found a significant signal for some features, but these results were obtained on a small amount of characters and a reduced sample. Here we perform a comprehensive study in which we quantify the phylogenetic signal on 62 osteohistological features in an exhaustive sample of palaeognathous birds. We used four different estimators to measure phylog...
ABSTRACT The study of bone growth rate and metabolic rate evolution in archosaurs (crocodiles, dinosaurs including birds, and pterosaurs) and close outgroups has become a subject of major interest among paleontologists in recent years. In this paper, we estimate the bone growth rate of Euparkeria using a new statistical inference model for the humerus. We modified the taxonomic range of extant species used in previous studies, on which we performed quantitative measurements of histological featu...
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