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de Vries D, Winchester JM, Fulwood EL, St Clair EM, Boyer DM. Dental topography of prosimian premolars predicts diet: A comparison in premolar and molar dietary classification accuracies. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024; 185:e24995. [PMID: 38965918 DOI: 10.1002/ajpa.24995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 06/18/2024] [Accepted: 06/21/2024] [Indexed: 07/06/2024]
Abstract
OBJECTIVES This study tests whether (1) premolar topography of extant "prosimians" (strepsirrhines and tarsiers) successfully predicts diet and (2) whether the combination of molar and premolar topography yields higher classification accuracy than using either tooth position in isolation. MATERIALS AND METHODS Dental topographic metrics (ariaDNE, relief index, and orientation patch count rotated) were calculated for 118 individual matched-pairs of mandibular fourth premolars (P4) and second molars (M2). The sample represents 7 families and 22 genera. Tooth variables were analyzed in isolation (P4 only; M2 only), together (P4 and M2), and combined (PC1 scores of bivariate principal component analyses of P4 and M2 for each metric). Discriminant function analyses were conducted with and without a measure of size (two-dimensional surface area). RESULTS When using topography only, "prosimian" P4 shape predicts diet with a success rate that is slightly higher than that of M2 shape. When absolute size is included, premolars and molars perform comparably well. Including both premolar and molar topography (separately or combined) improves classification accuracy for every analysis beyond considering either in isolation. Classification accuracy is highest when premolar and molar topography and size are included. DISCUSSION Our findings indicate that molar teeth incompletely summarize the functional requirements of oral food breakdown for a given diet, and that the mechanism selecting for premolar form is more varied than what is expressed by molar teeth. Finally, our findings suggest that fossil P4s (in isolation or with the M2) can be used for meaningful dietary reconstruction of extinct primates.
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Affiliation(s)
- Dorien de Vries
- School of Science, Engineering, and Environment, University of Salford, Salford, UK
- Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, New York, USA
| | - Julie M Winchester
- Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, USA
| | - Ethan L Fulwood
- DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, Tennessee, USA
| | | | - Doug M Boyer
- Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, USA
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2
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DeMers AC, Hunter JP. Dental complexity and diet in amniotes: A meta-analysis. PLoS One 2024; 19:e0292358. [PMID: 38306370 PMCID: PMC10836679 DOI: 10.1371/journal.pone.0292358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 09/19/2023] [Indexed: 02/04/2024] Open
Abstract
Tooth morphology is among the most well-studied indicators of ecology. For decades, researchers have examined the gross morphology and wear patterns of teeth as indicators of diet, and recent advances in scanning and computer analysis have allowed the development of new and more quantitative measures of tooth morphology. One of the most popular of these new methods is orientation patch count (OPC). OPC, a measure of surface complexity, was originally developed to distinguish the more complex tooth crowns of herbivores from the less complex tooth crowns of faunivores. OPC and a similar method derived from it, orientation patch count rotated (OPCR), have become commonplace in analyses of both modern and fossil amniote dietary ecology. The widespread use of these techniques makes it possible to now re-assess the utility of OPC and OPCR. Here, we undertake a comprehensive review of OPC(R) and diet and perform a meta-analysis to determine the overall difference in complexity between herbivores and faunivores. We find that the relationship between faunivore and herbivore OPC or OPCR values differs substantially across studies, and although some support the initial assessment of greater complexity in herbivores, others do not. Our meta-analysis does not support an overall pattern of greater complexity in herbivores than faunivores across terrestrial amniotes. It appears that the relationship of OPC or OPCR to diet is taxon-specific and dependent on the type of faunivory of the group in question, with insectivores often having values similar to herbivores. We suggest extreme caution in comparing OPC and OPCR values across studies and offer suggestions for how OPCR can constructively be used in future research.
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Affiliation(s)
- Anessa C DeMers
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, Ohio, United States of America
| | - John P Hunter
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Newark, Ohio, United States of America
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Dubied M, Montuire S, Navarro N. Functional constraints channel mandible shape ontogenies in rodents. ROYAL SOCIETY OPEN SCIENCE 2022; 9:220352. [PMID: 36300135 PMCID: PMC9579770 DOI: 10.1098/rsos.220352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 08/31/2022] [Indexed: 06/16/2023]
Abstract
In mammals, postnatal growth plays an essential role in the acquisition of the adult shape. During this period, the mandible undergoes many changing functional constraints, leading to spatialization of bone formation and remodelling to accommodate various dietary and behavioural changes. The interactions between the bone, muscles and teeth drive this developmental plasticity, which, in turn, could lead to convergences in the developmental processes constraining the directionality of ontogenies, their evolution and thus the adult shape variation. To test the importance of the interactions between tissues in shaping the ontogenetic trajectories, we compared the mandible shape at five postnatal stages on three rodents: the house mouse, the Mongolian gerbil and the golden hamster, using geometric morphometrics. After an early shape differentiation, by both longer gestation and allometric scaling in gerbils or early divergence of postnatal ontogeny in hamsters in comparison with the mouse, the ontogenetic trajectories appear more similar around weaning. The changes in muscle load associated with new food processing and new behaviours at weaning seem to impose similar physical constraints on the mandible, driving the convergences of the ontogeny at that stage despite an early anatomical differentiation. Nonetheless, mice present a rather different timing compared with gerbils or hamsters.
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Affiliation(s)
- Morgane Dubied
- Biogéosciences, UMR 6282 CNRS, EPHE, Université Bourgogne Franche-Comté, 6 bd Gabriel, 21000 Dijon, France
| | - Sophie Montuire
- Biogéosciences, UMR 6282 CNRS, EPHE, Université Bourgogne Franche-Comté, 6 bd Gabriel, 21000 Dijon, France
- EPHE, PSL University, 75014 Paris, France
| | - Nicolas Navarro
- Biogéosciences, UMR 6282 CNRS, EPHE, Université Bourgogne Franche-Comté, 6 bd Gabriel, 21000 Dijon, France
- EPHE, PSL University, 75014 Paris, France
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How Can Phenotypic Evolution be Characterized Over Time and Through Environmental Changes? J MAMM EVOL 2022. [DOI: 10.1007/s10914-022-09620-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Berthaume MA, Lazzari V, Guy F. The landscape of tooth shape: Over 20 years of dental topography in primates. Evol Anthropol 2020; 29:245-262. [PMID: 32687672 PMCID: PMC7689778 DOI: 10.1002/evan.21856] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 11/14/2019] [Accepted: 06/24/2020] [Indexed: 12/19/2022]
Abstract
Diet plays an incontrovertible role in primate evolution, affecting anatomy, growth and development, behavior, and social structure. It should come as no surprise that a myriad of methods for reconstructing diet have developed, mostly utilizing the element that is not only most common in the fossil record but also most pertinent to diet: teeth. Twenty years ago, the union of traditional, anatomical analyses with emerging scanning and imaging technologies led to the development of a new method for quantifying tooth shape and reconstructing the diets of extinct primates. This method became known as dental topography.
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Affiliation(s)
- Michael A. Berthaume
- Division of Mechanical Engineering and DesignLondon South Bank UniversityLondonUK
- Department of BioengineeringImperial College LondonLondonUK
| | - Vincent Lazzari
- PALEVOPRIM—UMR 7262 CNRS INEE Laboratoire Paléontologie Evolution Paléoécosystèmes PaléoprimatologieUniversité de PoitiersPoitiersFrance
| | - Franck Guy
- PALEVOPRIM—UMR 7262 CNRS INEE Laboratoire Paléontologie Evolution Paléoécosystèmes PaléoprimatologieUniversité de PoitiersPoitiersFrance
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Balanta-Melo J, Toro-Ibacache V, Torres-Quintana MA, Kupczik K, Vega C, Morales C, Hernández-Moya N, Arias-Calderón M, Beato C, Buvinic S. Early molecular response and microanatomical changes in the masseter muscle and mandibular head after botulinum toxin intervention in adult mice. Ann Anat 2017; 216:112-119. [PMID: 29289710 DOI: 10.1016/j.aanat.2017.11.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/22/2017] [Accepted: 11/27/2017] [Indexed: 11/19/2022]
Abstract
BACKGROUND Masseter muscle paralysis induced by botulinum toxin type A (BoNTA) evokes subchondral bone loss in mandibular heads of adult rats and growing mice after 4 weeks. However, the primary cellular and molecular events leading to altered bone remodeling remain unexplored. Thus, the aim of the current work has been to assess the molecular response that precedes the early microanatomical changes in the masseter muscle and subchondral bone of the mandibular head in adult mice after BoNTA intervention. METHODS A pre-clinical in vivo study was performed by a single intramuscular injection of 0.2 U BoNTA in the right masseter (experimental) of adult BALB/c mice. The contralateral masseter was injected with vehicle (control). Changes in mRNA levels of molecular markers of bone loss or muscle atrophy/regeneration were addressed by qPCR at day 2 or 7, respectively. mRNA levels of receptor activator of nuclear factor-κB ligand (RANKL) was assessed in mandibular heads, whilst mRNA levels of Atrogin-1/MAFbx, MuRF-1 and Myogenin were addressed in masseter muscles. In order to identify the early microanatomical changes at day 14, fiber diameters in transversal sections of masseter muscles were quantified, and histomorphometric analysis was used to determine the bone per tissue area and the trabecular thickness of subchondral bone of the mandibular heads. RESULTS An increase of up to 4-fold in RANKL mRNA levels were detected in mandibular heads of the BoNTA-injected sides as early as 2 days after intervention. Moreover, a 4-6 fold increase in Atrogin-1/MAFbx and MuRF-1 and an up to 25 fold increase in Myogenin mRNA level were detected in masseter muscles 7 days after BoNTA injections. Masseter muscle mass, as well as individual muscle fiber diameter, were significantly reduced in BoNTA-injected side after 14 days post-intervention. At the same time, in the mandibular heads from the treated side, the subchondral bone loss was evinced by a significant reduction in bone per tissue area (-40%) and trabecular thickness (-55%). CONCLUSIONS Our results show that masseter muscle paralysis induced by BoNTA leads to significant microanatomical changes by day 14, preceded by molecular changes as early as 2 days in bone, and 7 days in muscle. Therefore, masseter muscle atrophy and subchondral bone loss detected at 14 days are preceded by molecular responses that occur during the first week after BoNTA intervention.
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Affiliation(s)
- Julián Balanta-Melo
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile; School of Dentistry, Universidad del Valle, Colombia
| | - Viviana Toro-Ibacache
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile; Quantitative Analysis Center in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Chile; Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Germany
| | | | - Kornelius Kupczik
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Germany
| | - Carolina Vega
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile
| | - Camilo Morales
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile; Department of Basic Sciences, Health Faculty, Pontificia Universidad Javeriana, Colombia; Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Chile
| | - Nadia Hernández-Moya
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile
| | - Manuel Arias-Calderón
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile; Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Chile
| | - Carolina Beato
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile; Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Chile
| | - Sonja Buvinic
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Chile.
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Fort P, Blangy A. The Evolutionary Landscape of Dbl-Like RhoGEF Families: Adapting Eukaryotic Cells to Environmental Signals. Genome Biol Evol 2017; 9:1471-1486. [PMID: 28541439 PMCID: PMC5499878 DOI: 10.1093/gbe/evx100] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2017] [Indexed: 12/27/2022] Open
Abstract
The dynamics of cell morphology in eukaryotes is largely controlled by small GTPases of the Rho family. Rho GTPases are activated by guanine nucleotide exchange factors (RhoGEFs), of which diffuse B-cell lymphoma (Dbl)-like members form the largest family. Here, we surveyed Dbl-like sequences from 175 eukaryotic genomes and illuminate how the Dbl family evolved in all eukaryotic supergroups. By combining probabilistic phylogenetic approaches and functional domain analysis, we show that the human Dbl-like family is made of 71 members, structured into 20 subfamilies. The 71 members were already present in ancestral jawed vertebrates, but several members were subsequently lost in specific clades, up to 12% in birds. The jawed vertebrate repertoire was established from two rounds of duplications that occurred between tunicates, cyclostomes, and jawed vertebrates. Duplicated members showed distinct tissue distributions, conserved at least in Amniotes. All 20 subfamilies have members in Deuterostomes and Protostomes. Nineteen subfamilies are present in Porifera, the first phylum that diverged in Metazoa, 14 in Choanoflagellida and Filasterea, single-celled organisms closely related to Metazoa and three in Fungi, the sister clade to Metazoa. Other eukaryotic supergroups show an extraordinary variability of Dbl-like repertoires as a result of repeated and independent gain and loss events. Last, we observed that in Metazoa, the number of Dbl-like RhoGEFs varies in proportion of cell signaling complexity. Overall, our analysis supports the conclusion that Dbl-like RhoGEFs were present at the origin of eukaryotes and evolved as highly adaptive cell signaling mediators.
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Affiliation(s)
- Philippe Fort
- CRBM, Université of Montpellier, France.,CNRS, UMR5237, Montpellier, France
| | - Anne Blangy
- CRBM, Université of Montpellier, France.,CNRS, UMR5237, Montpellier, France
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Fabre PH, Herrel A, Fitriana Y, Meslin L, Hautier L. Masticatory muscle architecture in a water-rat from Australasia (Murinae, Hydromys) and its implication for the evolution of carnivory in rodents. J Anat 2017; 231:380-397. [PMID: 28585258 DOI: 10.1111/joa.12639] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2017] [Indexed: 01/29/2023] Open
Abstract
Murines are well known for their generalist diet, but several of them display specializations towards a carnivorous diet such as the amphibious Indo-Pacific water-rats. Despite the fact that carnivory evolved repeatedly in this group, few studies have investigated associated changes in jaw muscle anatomy and biomechanics. Here, we describe the jaw muscles and cranial anatomy of a carnivorous water-rat, Hydromys chrysogaster. The architecture of the jaw musculature of six specimens captured both on Obi and Papua were studied and described using dissections. We identified the origin and insertions of the jaw muscles, and quantified muscle mass, fiber length, physiological cross-sectional area, and muscle vectors for each muscle. Using a biomechanical model, we estimated maximum incisor and molar bite force at different gape angles. Finally, we conducted a 2D geometric morphometric analyses to compare jaw shape, mechanical potential, and diversity in lever-arm ratios for a set of 238 specimens, representative of Australo-Papuan carnivorous and omnivorous murids. Our study reveals major changes in the muscle proportions among Hydromys and its omnivorous close relative, Melomys. Hydromys was found to have large superficial masseter and temporalis muscles as well as a reduced deep masseter and zygomatico-mandibularis, highlighting major functional divergence among omnivorous and carnivorous murines. Changes in these muscles are also accompanied by changes in jaw shape and the lines of action of the muscles. A more vertically oriented masseter, reduced masseteric muscles, as well as an elongated jaw with proodont lower incisors are key features indicative of a reduced propalinality in carnivorous Hydromys. Differences in the fiber length of the masseteric muscles were also detected between Hydromys and Melomys, which highlight potential adaptations to a wide gape in Hydromys, allowing it to prey on larger animals. Using a biomechanical model, we inferred a greater bite force in Hydromys than in Melomys, implying a functional shift between omnivory and carnivory. However, Melomys has an unexpected greater bite force at large gape compared with Hydromys. Compared with omnivorous Melomys, Hydromys have a very distinctive low mandible with a well-developed coronoid process, and a reduced angular process that projects posteriorly to the ascending rami. This jaw shape, along with our mechanical potential and jaw lever ratio estimates, suggests that Hydromys has a faster jaw closing at the incisor, with a higher bite force at the level of the molars. The narrowing of the Hydromys jaw explains this higher lever advantage at the molars, which constitutes a good compromise between a wide gape, a reduced anterior masseteric mass, and long fiber lengths. Lever arms of the superficial and deep masseter are less favourable to force output of the mandible in Hydromys but more favourable to speed. Compared with the small input lever arm defined between the condyle and the angular process, the relatively longer mandible of Hydromys increases the speed at the expense of the output force. This unique combination of morphological features of the masticatory apparatus possibly has permitted Hydromys to become a highly successful amphibious predator in the Indo-Pacific region.
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Affiliation(s)
- P-H Fabre
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France.,National Museum of Natural History, Smithsonian Institution, Washington, DC, USA.,Harvard Museum of Comparative Zoology, Cambridge, MA, USA
| | - A Herrel
- Département d'Ecologie et de Gestion de la Biodiversité, UMR 7179 C.N.R.S/M.N.H.N., Paris, France.,Evolutionary Morphology of Vertebrates, Ghent University, Gent, Belgium
| | - Y Fitriana
- Museum Zoologicum Bogoriense, Research Center For Biology, Indonesian Institute of Sciences (LIPI), Cibinong, Indonesia
| | - L Meslin
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France
| | - L Hautier
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France
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Verde Arregoitia LD, Fisher DO, Schweizer M. Morphology captures diet and locomotor types in rodents. ROYAL SOCIETY OPEN SCIENCE 2017; 4:160957. [PMID: 28280593 PMCID: PMC5319359 DOI: 10.1098/rsos.160957] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 12/15/2016] [Indexed: 05/10/2023]
Abstract
To understand the functional meaning of morphological features, we need to relate what we know about morphology and ecology in a meaningful, quantitative framework. Closely related species usually share more phenotypic features than distant ones, but close relatives do not necessarily have the same ecologies. Rodents are the most diverse group of living mammals, with impressive ecomorphological diversification. We used museum collections and ecological literature to gather data on morphology, diet and locomotion for 208 species of rodents from different bioregions to investigate how morphological similarity and phylogenetic relatedness are associated with ecology. After considering differences in body size and shared evolutionary history, we find that unrelated species with similar ecologies can be characterized by a well-defined suite of morphological features. Our results validate the hypothesized ecological relevance of the chosen traits. These cranial, dental and external (e.g. ears) characters predicted diet and locomotion and showed consistent differences among species with different feeding and substrate use strategies. We conclude that when ecological characters do not show strong phylogenetic patterns, we cannot simply assume that close relatives are ecologically similar. Museum specimens are valuable records of species' phenotypes and with the characters proposed here, morphology can reflect functional similarity, an important component of community ecology and macroevolution.
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Affiliation(s)
| | - Diana O. Fisher
- School of Biological Sciences, University of Queensland, St Lucia, Queensland 4072, Australia
| | - Manuel Schweizer
- Naturhistorisches Museum Bern, Bernastrasse 15, Bern 3005, Switzerland
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10
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Verde Arregoitia LD, Fisher DO, Schweizer M. Morphology captures diet and locomotor types in rodents. ROYAL SOCIETY OPEN SCIENCE 2017. [PMID: 28280593 DOI: 10.5281/zenodo.201147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
To understand the functional meaning of morphological features, we need to relate what we know about morphology and ecology in a meaningful, quantitative framework. Closely related species usually share more phenotypic features than distant ones, but close relatives do not necessarily have the same ecologies. Rodents are the most diverse group of living mammals, with impressive ecomorphological diversification. We used museum collections and ecological literature to gather data on morphology, diet and locomotion for 208 species of rodents from different bioregions to investigate how morphological similarity and phylogenetic relatedness are associated with ecology. After considering differences in body size and shared evolutionary history, we find that unrelated species with similar ecologies can be characterized by a well-defined suite of morphological features. Our results validate the hypothesized ecological relevance of the chosen traits. These cranial, dental and external (e.g. ears) characters predicted diet and locomotion and showed consistent differences among species with different feeding and substrate use strategies. We conclude that when ecological characters do not show strong phylogenetic patterns, we cannot simply assume that close relatives are ecologically similar. Museum specimens are valuable records of species' phenotypes and with the characters proposed here, morphology can reflect functional similarity, an important component of community ecology and macroevolution.
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Affiliation(s)
| | - Diana O Fisher
- School of Biological Sciences , University of Queensland , St Lucia, Queensland 4072 , Australia
| | - Manuel Schweizer
- Naturhistorisches Museum Bern, Bernastrasse 15, Bern 3005 , Switzerland
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Pagès M, Fabre PH, Chaval Y, Mortelliti A, Nicolas V, Wells K, Michaux JR, Lazzari V. Molecular phylogeny of South-East Asian arboreal murine rodents. ZOOL SCR 2015. [DOI: 10.1111/zsc.12161] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marie Pagès
- Unité de génétique de la conservation; Institut de Botanique; Université de Liège; 4000 Liège (Sart Tilman) Belgique
- INRA; UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro); Campus International de Baillarguet, CS 30016 34988 Montferrier-sur-Lez Cedex France
- Institut des Sciences de l’Évolution de Montpellier; Université de Montpellier; CNRS; IRD; EPHE; 34095 Montpellier France
| | - Pierre-Henri Fabre
- Harvard Museum of Comparative Zoology; 26 Oxford Street Cambridge MA 02138 USA
- Smithsonian Institution; PO Box 37012, MRC 108 Washington DC 20013-7012 USA
| | - Yannick Chaval
- INRA; UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro); Campus International de Baillarguet, CS 30016 34988 Montferrier-sur-Lez Cedex France
| | - Alessio Mortelliti
- Department of Wildlife, Fisheries, and Conservation Biology; University of Maine; 5755 Nutting Hall, Room 228 Orono ME 04469 USA
| | - Violaine Nicolas
- Institut de Systématique, Évolution, Biodiversité; ISYEB - UMR 7205, CNRS; MNHN; UPMC; EPHE; Muséum national d'Histoire naturelle; Sorbonne Universités 57 rue Cuvier, CP 51 75005 Paris France
| | - Konstans Wells
- Environmental Futures Research Institute; Griffith University; Brisbane Qld 4111 Australia
| | - Johan R. Michaux
- Unité de génétique de la conservation; Institut de Botanique; Université de Liège; 4000 Liège (Sart Tilman) Belgique
- CIRAD; TA C- 22/E - Campus international de Baillarguet 34398 Montpellier Cedex 5 France
| | - Vincent Lazzari
- Institut de paléoprimatologie; Paléontologie Humaine: Evolution et paléoenvironnements - UMR CNRS 7262 INEE; 86022 6 rue Michel Brunet Poitier France
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Guy F, Lazzari V, Gilissen E, Thiery G. To What Extent is Primate Second Molar Enamel Occlusal Morphology Shaped by the Enamel-Dentine Junction? PLoS One 2015; 10:e0138802. [PMID: 26406597 PMCID: PMC4634312 DOI: 10.1371/journal.pone.0138802] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/03/2015] [Indexed: 11/18/2022] Open
Abstract
The form of two hard tissues of the mammalian tooth, dentine and enamel, is the result of a combination of the phylogenetic inheritance of dental traits and the adaptive selection of these traits during evolution. Recent decades have been significant in unveiling developmental processes controlling tooth morphogenesis, dental variation and the origination of dental novelties. The enamel-dentine junction constitutes a precursor for the morphology of the outer enamel surface through growth of the enamel cap which may go along with the addition of original features. The relative contribution of these two tooth components to morphological variation and their respective response to natural selection is a major issue in paleoanthropology. This study will determine how much enamel morphology relies on the form of the enamel-dentine junction. The outer occlusal enamel surface and the enamel-dentine junction surface of 76 primate second upper molars are represented by polygonal meshes and investigated using tridimensional topometrical analysis. Quantitative criteria (elevation, inclination, orientation, curvature and occlusal patch count) are introduced to show that the enamel-dentine junction significantly constrains the topographical properties of the outer enamel surface. Our results show a significant correlation for elevation, orientation, inclination, curvature and occlusal complexity between the outer enamel surface and the enamel dentine junction for all studied primate taxa with the exception of four modern humans for curvature (p<0.05). Moreover, we show that, for all selected topometrical parameters apart from occlusal patch count, the recorded correlations significantly decrease along with enamel thickening in our sample. While preserving tooth integrity by providing resistance to wear and fractures, the variation of enamel thickness may modify the curvature present at the occlusal enamel surface in relation to enamel-dentine junction, potentially modifying dental functionalities such as blunt versus sharp dental tools. In terms of natural selection, there is a balance between increasing tooth resistance and maintaining efficient dental tools. In this sense the enamel cap acts as a functional buffer for the molar occlusal pattern. In primates, results suggest a primary emergence of dental novelties on the enamel-dentine junction and a secondary transposition of these novelties with no or minor modifications of dental functionalities by the enamel cap. Whereas enamel crenations have been reported by previous studies, our analysis do not support the presence of enamel tubercles without dentine relief nuclei. As is, the enamel cap is, at most, a secondary source of morphological novelty.
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Affiliation(s)
- Franck Guy
- CNRS INEE UMR 7262 – IPHEP, Institut de Paléoprimatologie et Paléontologie Humaine, Evolution et Paléoenvironnements. Université de Poitiers – Faculté des Sciences, Bât. B35 –TSA 51106, 6 rue Michel Brunet, 86073, Poitiers, Cedex 9, France
| | - Vincent Lazzari
- CNRS INEE UMR 7262 – IPHEP, Institut de Paléoprimatologie et Paléontologie Humaine, Evolution et Paléoenvironnements. Université de Poitiers – Faculté des Sciences, Bât. B35 –TSA 51106, 6 rue Michel Brunet, 86073, Poitiers, Cedex 9, France
| | - Emmanuel Gilissen
- Department of African Zoology, Royal Museum of Central Africa, B-3080, Tervuren, Belgium
- Laboratory of Histology and Neuropathology, Université Libre de Bruxelles, B-1070, Brussels, Belgium
| | - Ghislain Thiery
- CNRS INEE UMR 7262 – IPHEP, Institut de Paléoprimatologie et Paléontologie Humaine, Evolution et Paléoenvironnements. Université de Poitiers – Faculté des Sciences, Bât. B35 –TSA 51106, 6 rue Michel Brunet, 86073, Poitiers, Cedex 9, France
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