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Pauwels OSG, Brecko J, Baeghe D, Venderickx J, Vanderheyden A, Backeljau T. Morphological, acoustic and genetic identification of a reproducing population of the invasive African clawed frog Xenopuslaevis (Anura, Pipidae) recently discovered in Belgium. Zookeys 2023; 1184:41-64. [PMID: 38023767 PMCID: PMC10664028 DOI: 10.3897/zookeys.1184.103702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 10/01/2023] [Indexed: 12/01/2023] Open
Abstract
Using external morphology of adults and tadpoles, osteology from high-resolution microcomputed tomography, vocalization analysis, and DNA sequence data, the identity of a reproducing Belgian population of invasive Xenopus at the current northernmost edge of the distribution of the genus in Europe was assessed. All data concur to an identification as Xenopus (Xenopus) laevis (Daudin, 1802). Genetically it is most closely related to populations of the Cape region in South Africa. No studies on the natural history of the Belgian Xenopus population and its impact on the local environment have been made to date.
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Affiliation(s)
- Olivier S. G. Pauwels
- Scientific Heritage, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, B-1000 Brussels, BelgiumScientific Heritage, Royal Belgian Institute of Natural SciencesBrusselsBelgium
| | - Jonathan Brecko
- Scientific Heritage, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, B-1000 Brussels, BelgiumScientific Heritage, Royal Belgian Institute of Natural SciencesBrusselsBelgium
- Royal Museum for Central Africa, Leuvensesteenweg 13, B-3080 Tervuren, BelgiumRoyal Museum for Central AfricaTervurenBelgium
| | - Dimitri Baeghe
- Evolutionary Biology and Ecology (CP 160/12), Department of Organismic Biology, Faculty of Sciences, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, BelgiumUniversité Libre de BruxellesBrusselsBelgium
| | - Jeroen Venderickx
- Scientific Heritage, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, B-1000 Brussels, BelgiumScientific Heritage, Royal Belgian Institute of Natural SciencesBrusselsBelgium
- Operational Directorate Natural Environment, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, BelgiumOperational Directorate Natural Environment, Royal Belgian Institute of Natural SciencesBrusselsBelgium
| | - Ann Vanderheyden
- Barcoding Facility for Organisms and Tissues of Policy Concern (BopCo), Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, BelgiumBarcoding Facility for Organisms and Tissues of Policy Concern (BopCo), Royal Belgian Institute of Natural SciencesBrusselsBelgium
| | - Thierry Backeljau
- Barcoding Facility for Organisms and Tissues of Policy Concern (BopCo), Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, BelgiumBarcoding Facility for Organisms and Tissues of Policy Concern (BopCo), Royal Belgian Institute of Natural SciencesBrusselsBelgium
- Evolutionary Ecology Group, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, BelgiumUniversity of AntwerpAntwerpBelgium
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2
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Kinsey CT, Ratz C, Adams D, Webber-Shultz A, Blob R. Effects of Development on Bone Mineral Density and Mechanical Properties in the Aquatic Frog, Xenopus Laevis, and a Terrestrial Frog, Lithobates Catesbianus. Integr Comp Biol 2023; 63:705-713. [PMID: 37289595 DOI: 10.1093/icb/icad039] [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: 04/01/2023] [Revised: 05/10/2023] [Accepted: 05/10/2023] [Indexed: 06/10/2023] Open
Abstract
The limb bones of vertebrates have a critical role in supporting the weight of the body and transmitting forces that power locomotion. The loads that limb bones experience can vary in association with a range of factors, including locomotor environment or developmental stage. Limbed vertebrates that are habitually found in environments with low locomotor loads (e.g., water) might be predicted to also exhibit limb bones with less elevated mechanical properties, such as yield stiffness and yield stress. Frogs provide a distinctive case, in which these ideas can be tested as they experience changes in both locomotor style and habitat as they develop. However, while many frog taxa shift from aquatic to terrestrial habitats as they metamorphose, some lineages, such as pipids, maintain an aquatic lifestyle even after metamorphosis, providing a comparative framework for the effects of habitat shifts on developing limbs in vertebrates. This study compares the material composition and mechanical properties of the femur between frog species that are aquatic specialists (Xenopus laevis) vs generalists that spend considerable time both on land and in water (Lithobates catesbeianus) as they transition from metamorphic tadpoles to fully grown adults. MicroCT scanning was used to determine changes in bone density related to developmental stage and hindlimb use during swimming. Microindentation was then used to collect hardness values from the cortical bone of each femur, which was used to evaluate bone material properties. We found that aquatic frogs had less overall bone mineral density (BMD) than terrestrial frogs and that BMD was more elevated in the cortical region of the diaphysis than trabeculae and distal and proximal epiphyses. Despite its less elevated BMD, bone mechanical properties were not significantly different in aquatic specialist X. laevis than in more terrestrial L. catesbeianus. Our results suggest that the limb bones of aquatic frogs may experience compensatory effects through development to offset their lower BMD. Furthermore, changes in bone density and material properties across development may help to explain some of the differences in locomotor performance found between aquatic and terrestrial metamorphic frogs, providing insight into how environmental factors might correlate with bone ossification.
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Affiliation(s)
- Chase T Kinsey
- Department of Biological Sciences, Clemson University, 118 Long Hall Clemson, SC 29634, USA
| | - Caleb Ratz
- Department of Biological Sciences, Clemson University, 118 Long Hall Clemson, SC 29634, USA
| | - Danielle Adams
- Department of Biological Sciences, Clemson University, 118 Long Hall Clemson, SC 29634, USA
| | - Amani Webber-Shultz
- Department of Biological Sciences, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Richard Blob
- Department of Biological Sciences, Clemson University, 118 Long Hall Clemson, SC 29634, USA
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3
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Turazzini GF, Gómez RO. Comparative osteology of paradoxical frogs (Hylidae: Pseudae) with comments on diagnostic features, evolutionary trends and potential aquatic adaptations. ZOOL ANZ 2023. [DOI: 10.1016/j.jcz.2023.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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4
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Arroyo S, Targino M, Rueda-Solano LA, Daza JM, Grant T. A new genus of terraranas (Anura: Brachycephaloidea) from northern South America, with a systematic review of Tachiramantis. SYST BIODIVERS 2022. [DOI: 10.1080/14772000.2022.2123865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sandy Arroyo
- Laboratorio de Anfibios, Grupo Cladística Profunda y Biogeografía Histórica, Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Mariane Targino
- Laboratório de Anfíbios, Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
- Departamento de Vertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Brazil
| | - Luis Alberto Rueda-Solano
- Grupo de Investigación en Biodiversidad y Ecología Aplicada (GIBEA), Facultad de Ciencias Básicas, Universidad del Magdalena, Santa Marta, Colombia
| | - Juan M. Daza
- Grupo Herpetológico de Antioquia, Instituto de Biología, Universidad de Antioquia, Medellín, Colombia
| | - Taran Grant
- Laboratório de Anfíbios, Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
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5
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Keeffe RM, Blob RW, Blackburn DC, Mayerl CJ. XROMM Analysis of Feeding Mechanics in Toads: Interactions of the Tongue, Hyoid, and Pectoral Girdle. Integr Org Biol 2022; 4:obac045. [PMCID: PMC9665897 DOI: 10.1093/iob/obac045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 10/04/2022] [Accepted: 10/20/2022] [Indexed: 10/17/2023] Open
Abstract
During feeding in many terrestrial vertebrates, the tongue acts in concert with the hyoid and pectoral girdle. In frogs, these three elements are interconnected by musculature. While the feeding mechanics of the anuran tongue are well-studied, little is known of how the motions of the tongue relate to the movements of the skeleton or how buccal structures move following closure of the mouth. Although features such as the pectoral girdle and hyoid are not externally visible in frogs, their motions can be tracked in X-ray video. We used XROMM (X-ray Reconstruction of Moving Morphology) techniques to track the 3D movements of the tongue, hyoid apparatus, pectoral girdle, skull, and jaw during the feeding cycle of the cane toad, Rhinella marina . We show how the movements of these elements are integrated during tongue protrusion and prey capture, as well as during prey transport, swallowing, and recovery. Our findings suggest that the hyoid apparatus is important both for prey manipulation and swallowing. The tongue consistently stretches posterior to the skull during swallowing, often more than it stretches during protrusion to reach the prey. Feeding kinematics are similar between individuals, and the kinematics of unsuccessful strikes generally resemble those of successful strikes. Our data also provide a new perspective on the potential role of the pectoral girdle, an element with a predominant locomotor function, during feeding events. This work raises new questions about the evolution of feeding in frogs, as well as how the diversity of pectoral and buccal anatomy observed across anurans may influence feeding kinematics.
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Affiliation(s)
- R M Keeffe
- Department of Biological Sciences, Mount Holyoke College, South Hadley, MA 01075, USA
| | - R W Blob
- Department of Biological Sciences, Clemson University, Clemson, SC 29634, USA
| | - D C Blackburn
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
| | - C J Mayerl
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
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Adler KA, De Nault DL, Cardoza CM, Womack M. Evolutionary rates and shape variation along the anuran vertebral column with attention to phylogeny, body size, and ecology. Evolution 2022; 76:2724-2738. [PMID: 36117276 DOI: 10.1111/evo.14614] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 07/31/2022] [Accepted: 08/08/2022] [Indexed: 01/22/2023]
Abstract
The vertebral column is critical to a vertebrate species' flexibility and skeletal support, making vertebrae a clear target for selection. Anurans (frogs and toads) have a unique, truncated vertebral column that appears constrained to provide axial rigidity for efficient jumping. However, no study has examined how presacral vertebrae shape varies among anuran species at the macroevolutionary scale nor how intrinsic (developmental and phylogenetic) and extrinsic (ecological) factors may have influenced vertebrae shape evolution. We used microCT scans and phylogenetic comparative methods to examine the vertebrae of hundreds of anuran species that vary in body size as well as adult and larval ecology. We found variation in shape and evolutionary rates among anuran vertebrae, dispelling any notion that trunk vertebrae evolve uniformly. We discovered the highest evolutionary rates in the cervical vertebrae and in the more caudal trunk vertebrae. We found little evidence for selection pressures related to adult or larval ecology affecting vertebrae evolution, but we did find body size was highly associated with vertebrae shape and microhabitat (mainly burrowing) affected those allometric relationships. Our results provide an interesting comparison to vertebrae evolution in other clades and a jumping-off point for studies of anuran vertebrae evolution and development.
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Affiliation(s)
- Katie A Adler
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, California, 94720
| | - Diego L De Nault
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, California, 94720
| | - Cassandra M Cardoza
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, California, 94720
| | - Molly Womack
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, California, 94720.,Department of Biology, Utah State University, Logan, Utah, 84322
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7
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Fouquet A, Cornuault J, Rodrigues MT, Werneck FP, Hrbek T, Acosta-Galvis AR, Massemin D, J. R. Kok P, Ernst R. Diversity, biogeography and reproductive evolution in the genus Pipa (Amphibia: Anura: Pipidae). Mol Phylogenet Evol 2022; 170:107442. [DOI: 10.1016/j.ympev.2022.107442] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 12/22/2021] [Accepted: 02/16/2022] [Indexed: 11/29/2022]
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8
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Araújo OGS, Pugener LA, Haddad CFB, Da Silva HR. Ontogeny as a way to understand morphology of nasal capsule structures in Pipidae, with focus on Pipa arrabali (Lissamphibia: Anura). Zool J Linn Soc 2021. [DOI: 10.1093/zoolinnean/zlab054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
After more than one-hundred years of studies, there is still no consensus regarding the names for the nasal elements in Pipidae and their correspondence to that of other frogs. Names vary depending on authors’ preferences for an explanatory process associated with the observed state of the structure. Some of the names indicate absence, while others indicate fusion. As naming morphological structures relates to some sort of consensus regarding systematics’ knowledge, one would expect results of the two activities to go hand-in-hand. Within the monophyletic Pipidae, one would expect that the names of structures would be all settled. However, the situation is the contrary. Our efforts to pursue such a research and properly name the involved structures resulted in a deeper understanding of the evolution within the taxa involved. Herein we present the results of the study of embryos and juveniles of P. arrabali; based on which we offer additional evidence for the proper naming of the involved elements of the nasal region. Furthermore, using key structures as topographical markers, and by comparing our evaluation to those presented by previous researchers, we have sorted out the compound nature of some key structures and present a proper naming for the morphology investigated.
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Affiliation(s)
- O G S Araújo
- Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, São Paulo, Caixa Postal 199, CEP, Brazil
| | - L A Pugener
- Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, Código Postal 6300, Santa Rosa, La Pampa, Argentina
| | - C F B Haddad
- Departamento de Biodiversidade e Centro ode Aquicultura, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, São Paulo, Caixa Postal 199, CEP, Brazil
| | - H R Da Silva
- Departamento de Biologia Animal, Instituto de Ciências Biológicas e da Saúde, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro, Caixa Postal 74524, CEP, Brazil
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9
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A Case of Mistaken Identity: Genetic and Anatomical Evidence Reveals the Cryptic Invasion of Xenopus tropicalis in Central Florida. J HERPETOL 2021. [DOI: 10.1670/20-083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Zattera ML, Lima L, Duarte I, de Sousa DY, Araújo OGDS, Gazoni T, Mott T, Recco-Pimentel SM, Bruschi DP. Chromosome spreading of the (TTAGGG)n repeats in the Pipa carvalhoi Miranda-Ribeiro, 1937 (Pipidae, Anura) karyotype. COMPARATIVE CYTOGENETICS 2019; 13:297-309. [PMID: 31649799 PMCID: PMC6803351 DOI: 10.3897/compcytogen.v13i3.35524] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 09/10/2019] [Indexed: 06/10/2023]
Abstract
Pipidae is a clade of Anura that diverged relatively early from other frogs in the phylogeny of the group. Pipids have a unique combination of morphological features, some of which appear to represent a mix of adaptations to aquatic life and plesiomorphic characters of Anura. The present study describes the karyotype of Pipa carvalhoi Miranda-Ribeiro, 1937, including morphology, heterochromatin distribution, and location of the NOR site. The diploid number of P. carvalhoi is 2n=20, including three metacentric pairs (1, 4, 8), two submetacentric (2 and 7), three subtelocentric (3, 5, 6), and two telocentric pairs (9 and 10). C-banding detected centromeric blocks of heterochromatin in all chromosome pairs and the NOR detected in chromosome pair 9, as confirmed by FISH using the rDNA 28S probe. The telomeric probes indicated the presence of interstitial telomeric sequences (ITSs), primarily in the centromeric region of the chromosomes, frequently associated with heterochromatin, suggesting that these repeats are a significant component of this region. The findings of the present study provide important insights for the understanding of the mechanisms of chromosomal evolution in the genus Pipa, and the diversification of the Pipidae as a whole.
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Affiliation(s)
- Michelle Louise Zattera
- Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, 81531-990,Curitiba, Paraná State, BrazilUniversidade Federal do ParanáCuritibaBrazil
| | - Luana Lima
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal do Alagoas (UFAL), Avenida Louriva Melo Mota S/N, 57072-900, Maceió, Alagoas State, BrazilUniversidade Federal do AlagoasMaceióBrazil
| | - Iraine Duarte
- Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, 81531-990,Curitiba, Paraná State, BrazilUniversidade Federal do ParanáCuritibaBrazil
| | - Deborah Yasmin de Sousa
- Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, 81531-990,Curitiba, Paraná State, BrazilUniversidade Federal do ParanáCuritibaBrazil
| | - Olívia Gabriela dos Santos Araújo
- Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista (Unesp) – Câmpus Rio Claro, Avenida 24 A 1515, Bela Vista, 13506-900, Rio Claro, São Paulo State, BrazilUniversidade Estadual PaulistaRio ClaroBrazil
| | - Thiago Gazoni
- Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista (Unesp) – Câmpus Rio Claro, Avenida 24 A 1515, Bela Vista, 13506-900, Rio Claro, São Paulo State, BrazilUniversidade Estadual PaulistaRio ClaroBrazil
| | - Tamí Mott
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal do Alagoas (UFAL), Avenida Louriva Melo Mota S/N, 57072-900, Maceió, Alagoas State, BrazilUniversidade Federal do AlagoasMaceióBrazil
| | - Shirlei Maria Recco-Pimentel
- Instituto de Biologia, Departamento de Biologia Estrutural e Funcional, Universidade Estadual de Campinas (UNICAMP), Avenida Bertrand Russel S/N, Barão Geraldo, 13083-865, Campinas, São Paulo State, BrazilUniversidade Estadual de CampinasCampinasBrazil
| | - Daniel Pacheco Bruschi
- Programa de Pós-Graduação em Genética, Departamento de Genética, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, 81531-990,Curitiba, Paraná State, BrazilUniversidade Federal do ParanáCuritibaBrazil
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11
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Abdala V, Vera MC, Amador LI, Fontanarrosa G, Fratani J, Ponssa ML. Sesamoids in tetrapods: the origin of new skeletal morphologies. Biol Rev Camb Philos Soc 2019; 94:2011-2032. [PMID: 31359608 DOI: 10.1111/brv.12546] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 02/06/2023]
Abstract
Along with supernumerary bones, sesamoids, defined as any organized intratendinous/intraligamentous structure, including those composed of fibrocartilage, adjacent to an articulation or joint, have been frequently considered as enigmatic structures associated with the joints of the skeletal system of vertebrates. This review allows us to propose a dynamic model to account for part of skeletal phenotypic diversity: during evolution, sesamoids can become displaced, attaching to and detaching from the long bone epiphyses and diaphysis. Epiphyses, apophyses and detached sesamoids are able to transform into each other, contributing to the phenotypic variability of the tetrapod skeleton. This dynamic model is a new paradigm to delineate the contribution of sesamoids to skeletal diversity. Herein, we first present a historical approach to the study of sesamoids, discussing the genetic versus epigenetic theories of their genesis and growth. Second, we construct a dynamic model. Third, we present a summary of literature on sesamoids of the main groups of tetrapods, including veterinary and human clinical contributions, which are the best-studied aspects of sesamoids in recent decades. Finally, we discuss the identity of certain structures that have been labelled as sesamoids despite insufficient formal testing of homology. We also propose a new definition to help the identification of sesamoids in general. This review is particularly timely, given the recent increasing interest and research activity into the developmental biology and mechanics of sesamoids. With this updated and integrative discussion, we hope to pave the way to improve the understanding of sesamoid biology and evolution.
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Affiliation(s)
- Virginia Abdala
- Cátedra de Biología General, Facultad de Ciencias Naturales e IML, UNT, Miguel Lillo 205, 4000, San Miguel de Tucumán, Argentina.,Instituto de Biodiversidad Neotropical, CONICET- UNT, Horco Molle s/n Yerba Buena, 4107, Tucumán, Argentina
| | - Miriam C Vera
- Instituto de Biología Subtropical (CONICET-UNaM), Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, Félix de Azara 1552, CPA N3300LQF, Posadas, Argentina
| | - Lucila I Amador
- Unidad Ejecutora Lillo, FML-CONICET, Miguel Lillo 251, 4000, San Miguel de Tucumán, Argentina
| | - Gabriela Fontanarrosa
- Instituto de Biodiversidad Neotropical, CONICET- UNT, Horco Molle s/n Yerba Buena, 4107, Tucumán, Argentina
| | - Jessica Fratani
- Unidad Ejecutora Lillo, FML-CONICET, Miguel Lillo 251, 4000, San Miguel de Tucumán, Argentina
| | - María L Ponssa
- Unidad Ejecutora Lillo, FML-CONICET, Miguel Lillo 251, 4000, San Miguel de Tucumán, Argentina
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12
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The Earliest Fossil of the African Clawed Frog (Genus Xenopus) from Sub-Saharan Africa. J HERPETOL 2019. [DOI: 10.1670/18-139] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Arenas-Rodríguez A, Rubiano Vargas JF, Hoyos JM. Comparative description and ossification patterns of Dendropsophus labialis (Peters, 1863) and Scinax ruber (Laurenti, 1758) (Anura: Hylidae). PeerJ 2018; 6:e4525. [PMID: 29892498 PMCID: PMC5994159 DOI: 10.7717/peerj.4525] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 02/27/2018] [Indexed: 11/20/2022] Open
Abstract
Although comparative studies of anuran ontogeny have provided new data on heterochrony in the life cycles of frogs, most of them have not included ossification sequences. Using differential staining techniques, we observe and describe differences and similarities of cranial and postcranial development in two hylid species, Scinax ruber (Scinaxinae) and Dendropsophus labialis (Hylinae), providing new data of ontogenetic studies in these Colombian species. We examined tadpoles raining from Gosner Stages 25 to 45. We found differences between species in the infrarostral and suprarostral cartilages, optic foramen, planum ethmoidale, and gill apparatus. In both species, the first elements to ossify were the atlas and transverse processes of the vertebral column and the parasphenoid. Both species exhibited suprascapular processes as described in other hylids. Although the hylids comprise a large group (over 700 species), postcranial ossification sequence is only known for 15 species. Therefore, the descriptions of the skeletal development and ossification sequences provided herein will be useful for future analyses of heterochrony in the group.
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Affiliation(s)
- Angélica Arenas-Rodríguez
- Facultad de Ciencias, UNESIS (Unidad de Ecología y Sistemática), Pontifica Universidad Javeriana, Bogotá, Colombia
| | | | - Julio Mario Hoyos
- Facultad de Ciencias, UNESIS (Unidad de Ecología y Sistemática), Pontifica Universidad Javeriana, Bogotá, Colombia
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14
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Conlon JM, Guilhaudis L, Leprince J, Coquet L, Mangoni ML, Attoub S, Jouenne T, King JD. Peptidomic analysis of skin secretions of the Mexican burrowing toad Rhinophrynus dorsalis (Rhinophrynidae): Insight into the origin of host-defense peptides within the Pipidae and characterization of a proline-arginine-rich peptide. Peptides 2017; 97:22-28. [PMID: 28951157 DOI: 10.1016/j.peptides.2017.09.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 08/23/2017] [Accepted: 09/22/2017] [Indexed: 10/18/2022]
Abstract
The Mexican burrowing toad Rhinophrynus dorsalis is the sole extant representative of the Rhinophrynidae. United in the superfamily Pipoidea, the Rhinophrynidae is considered to be the sister-group to the extant Pipidae which comprises Hymenochirus, Pipa, Pseudhymenochirus and Xenopus. Cationic, α-helical host-defense peptides of the type found in Hymenochirus, Pseudhymenochirus, and Xenopus species (hymenochirins, pseudhymenochirins, magainins, and peptides related to PGLa, XPF, and CPF) were not detected in norepinephrine-stimulated skin secretions of R. dorsalis. Skin secretions of representatives of the genus Pipa also do not contain cationic α-helical host-defense peptides which suggest, as the most parsimonious hypothesis, that the ability to produce such peptides by frogs within the Pipidae family arose in the common ancestor of (Hymenochirus+Pseudhymenochirus)+Xenopus after divergence from the line of evolution leading to extant Pipa species. Peptidomic analysis of the R. dorsalis secretions led to the isolation of rhinophrynin-27, a proline-arginine-rich peptide with the primary structure ELRLPEIARPVPEVLPARLPLPALPRN, together with rhinophrynin-33 containing the C-terminal extension KMAKNQ. Rhinophrynin-27 shows limited structural similarity to the porcine multifunctional peptide PR-39 but it lacks antimicrobial and cytotoxic activities. Like PR-39, the peptide adopts a poly-l-proline helix but some changes in the circular dichroism spectrum were observed in the presence of anionic sodium dodecylsulfate micelles consistent with the stabilization of turn structures.
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Affiliation(s)
- J Michael Conlon
- SAAD Centre for Pharmacy and Diabetes, School of Biomedical Sciences, University of Ulster, Coleraine BT52 1SA, UK.
| | - Laure Guilhaudis
- UNIROUEN, INSA Rouen, CNRS, COBRA, Normandy University, 76000 Rouen, France
| | - Jérôme Leprince
- Inserm UU1239, PRIMACEN, Institute for Research and Innovation in Biomedicine (IRIB), Normandy University, 76000 Rouen, France
| | - Laurent Coquet
- CNRS UMR 6270, PISSARO, Institute for Research and Innovation in Biomedicine (IRIB), Normandy University, 76000 Rouen, France
| | - Maria Luisa Mangoni
- Department of Biochemical Sciences Instituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Rome, Italy
| | - Samir Attoub
- Department of Pharmacology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Thierry Jouenne
- CNRS UMR 6270, PISSARO, Institute for Research and Innovation in Biomedicine (IRIB), Normandy University, 76000 Rouen, France
| | - Jay D King
- Rare Species Conservatory Foundation, St. Louis, MO 63110, USA
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Araújo O, Pugener L, Haddad C, Da Silva H. Morphology and development of the hyolaryngeal apparatus of Pipa arrabali (Anura: Pipidae). ZOOL ANZ 2017. [DOI: 10.1016/j.jcz.2017.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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de Queiroz A, Wimberger PH. THE USEFULNESS OF BEHAVIOR FOR PHYLOGENY ESTIMATION: LEVELS OF HOMOPLASY IN BEHAVIORAL AND MORPHOLOGICAL CHARACTERS. Evolution 2017; 47:46-60. [DOI: 10.1111/j.1558-5646.1993.tb01198.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/1991] [Accepted: 05/14/1992] [Indexed: 10/19/2022]
Affiliation(s)
- Alan de Queiroz
- Section of Ecology and Systematics; Cornell University; Ithaca NY 14853 USA
| | - Peter H. Wimberger
- Section of Ecology and Systematics; Cornell University; Ithaca NY 14853 USA
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17
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Porro LB, Richards CT. Digital dissection of the model organism Xenopus laevis using contrast-enhanced computed tomography. J Anat 2017; 231:169-191. [PMID: 28547827 DOI: 10.1111/joa.12625] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/15/2017] [Indexed: 01/03/2023] Open
Abstract
The African clawed frog, Xenopus laevis, is one of the most widely used model organisms in biological research. However, the most recent anatomical description of X. laevis was produced nearly a century ago. Compared with other anurans, pipid frogs - including X. laevis - exhibit numerous unusual morphological features; thus, anatomical descriptions of more 'typical' frogs do not detail many aspects of X. laevis skeletal and soft-tissue morphology. The relatively new method of using iodine-based agents to stain soft tissues prior to high-resolution X-ray imaging has several advantages over gross dissection, such as enabling dissection of very small and fragile specimens, and preserving the three-dimensional topology of anatomical structures. Here, we use contrast-enhanced computed tomography to produce a high-resolution three-dimensional digital dissection of a post-metamorphic X. laevis to successfully visualize: skeletal and muscular anatomy; the nervous, respiratory, digestive, excretory and reproductive systems; and the major sense organs. Our digital dissection updates and supplements previous anatomical descriptions of this key model organism, and we present the three-dimensional data as interactive portable document format (PDF) files that are easily accessible and freely available for research and educational purposes. The data presented here hold enormous potential for applications beyond descriptive purposes, particularly for biological researchers using this taxon as a model organism, comparative anatomy and biomechanical modelling.
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Affiliation(s)
- Laura B Porro
- Structure and Motion Laboratory, Department of Comparative Biomedical Sciences, Royal Veterinary College, Hatfield, Hertfordshire, UK
| | - Christopher T Richards
- Structure and Motion Laboratory, Department of Comparative Biomedical Sciences, Royal Veterinary College, Hatfield, Hertfordshire, UK
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18
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Cundall D, Fernandez E, Irish F. The suction mechanism of the pipid frog, Pipa pipa (Linnaeus, 1758). J Morphol 2017; 278:1229-1240. [PMID: 28547886 DOI: 10.1002/jmor.20707] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 04/13/2017] [Accepted: 04/28/2017] [Indexed: 11/06/2022]
Abstract
Most suction-feeding, aquatic vertebrates create suction by rapidly enlarging the oral cavity and pharynx. Forceful enlargement of the pharynx is powered by longitudinal muscles that retract skeletal elements of the hyoid, more caudal branchial arches, and, in many fish, the pectoral girdle. This arrangement was thought to characterize all suction-feeding vertebrates. However, it does not exist in the permanently aquatic, tongueless Pipa pipa, an Amazonian frog that can catch fish. Correlating high-speed (250 and 500 fps) video records with anatomical analysis and functional tests shows that fundamental features of tetrapod body design are altered to allow P. pipa to suction-feed. In P. pipa, the hyoid apparatus is not connected to the skull and is enclosed by the pectoral girdle. The major retractor of the hyoid apparatus arises not from the pectoral girdle but from the femur, which lies largely within the soft tissue boundaries of the trunk. Retraction of the hyoid is coupled with expansion of the anterior trunk, which occurs when the hypertrophied ventral pectoral elements are depressed and the urostyle and sacral vertebra are protracted and slide forward on the pelvic girdle, thereby elongating the entire trunk. We suggest that a single, robust pair of muscles adduct the cleithra to depress the ventral pectoral elements with force, while modified tail muscles slide the axial skeleton cranially on the pelvic girdle. Combined hyoid retraction, axial protraction, and pectoral depression expand the buccopharyngeal cavity to a volume potentially equal to that of the entire resting body of the frog. Pipa may be the only tetrapod vertebrate clade that enlarges its entire trunk during suction-feeding.
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Affiliation(s)
- David Cundall
- Biological Sciences, Lehigh University, 1 W. Packer Ave, Bethlehem, Pennsylvania, 18015-3001
| | - Edward Fernandez
- Biological Sciences, Lehigh University, 1 W. Packer Ave, Bethlehem, Pennsylvania, 18015-3001.,Cooper Medical School of Rowan University, 401 South Broad St, Camden, New Jersey, 08103
| | - Frances Irish
- Biological Sciences, Moravian College, 1200 Main St, Bethlehem, Pennsylvania, 18018
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19
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Barrionuevo JS. Frogs at the summits: phylogeny of the Andean frogs of the genusTelmatobius(Anura, Telmatobiidae) based on phenotypic characters. Cladistics 2016; 33:41-68. [DOI: 10.1111/cla.12158] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2016] [Indexed: 11/29/2022] Open
Affiliation(s)
- J. Sebastián Barrionuevo
- División Herpetología; Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” - CONICET; Ángel Gallardo 470 Buenos Aires C1405DJR Argentina
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20
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VanBuren CS, Evans DC. Evolution and function of anterior cervical vertebral fusion in tetrapods. Biol Rev Camb Philos Soc 2016; 92:608-626. [DOI: 10.1111/brv.12245] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 11/07/2015] [Accepted: 11/11/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Collin S. VanBuren
- Department of Earth Sciences; University of Cambridge; Downing Street CB2 3EQ Cambridge U.K
- Department of Ecology and Evolutionary Biology; University of Toronto; 25 Willcocks St. Toronto M5S 3B2 Ontario Canada
| | - David C. Evans
- Department of Ecology and Evolutionary Biology; University of Toronto; 25 Willcocks St. Toronto M5S 3B2 Ontario Canada
- Department of Natural History; Royal Ontario Museum; 100 Queens Park Rd Toronto M5S 2C6 Ontario Canada
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21
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Evans BJ, Carter TF, Greenbaum E, Gvoždík V, Kelley DB, McLaughlin PJ, Pauwels OSG, Portik DM, Stanley EL, Tinsley RC, Tobias ML, Blackburn DC. Genetics, Morphology, Advertisement Calls, and Historical Records Distinguish Six New Polyploid Species of African Clawed Frog (Xenopus, Pipidae) from West and Central Africa. PLoS One 2015; 10:e0142823. [PMID: 26672747 PMCID: PMC4682732 DOI: 10.1371/journal.pone.0142823] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 10/27/2015] [Indexed: 01/08/2023] Open
Abstract
African clawed frogs, genus Xenopus, are extraordinary among vertebrates in the diversity of their polyploid species and the high number of independent polyploidization events that occurred during their diversification. Here we update current understanding of the evolutionary history of this group and describe six new species from west and central sub-Saharan Africa, including four tetraploids and two dodecaploids. We provide information on molecular variation, morphology, karyotypes, vocalizations, and estimated geographic ranges, which support the distinctiveness of these new species. We resurrect Xenopus calcaratus from synonymy of Xenopus tropicalis and refer populations from Bioko Island and coastal Cameroon (near Mt. Cameroon) to this species. To facilitate comparisons to the new species, we also provide comments on the type specimens, morphology, and distributions of X. epitropicalis, X. tropicalis, and X. fraseri. This includes significantly restricted application of the names X. fraseri and X. epitropicalis, the first of which we argue is known definitively only from type specimens and possibly one other specimen. Inferring the evolutionary histories of these new species allows refinement of species groups within Xenopus and leads to our recognition of two subgenera (Xenopus and Silurana) and three species groups within the subgenus Xenopus (amieti, laevis, and muelleri species groups).
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Affiliation(s)
- Ben J. Evans
- Department of Biology, Life Sciences Building Room 328 McMaster University, Hamilton, Ontario, Canada
- * E-mail:
| | - Timothy F. Carter
- Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Eli Greenbaum
- Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas, United States of America
| | - Václav Gvoždík
- Institute of Vertebrate Biology, Czech Academy of Sciences, Kvetna 8, Brno, Czech Republic
- Department of Zoology, National Museum, Prague, Czech Republic
| | - Darcy B. Kelley
- Department of Biological Sciences, Columbia University, New York, New York, United States of America
| | - Patrick J. McLaughlin
- Department of Biology, Papadakis Integrated Sciences Building, Drexel University, Philadelphia, Pennsylvania, United States of America
| | - Olivier S. G. Pauwels
- Département des Vertébrés Récents, Instítut Royal des Sciences Naturelles de Belgique, Brussels, Belgium
| | - Daniel M. Portik
- Museum of Vertebrate Zoology, University of California, Berkeley, California, United States of America
| | - Edward L. Stanley
- California Academy of Sciences, San Francisco, California, United States of America
| | - Richard C. Tinsley
- School of Biological Sciences, University of Bristol, Bristol, United Kingdom
| | | | - David C. Blackburn
- California Academy of Sciences, San Francisco, California, United States of America
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22
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Barrionuevo JS. Independent Evolution of Suction Feeding in Neobatrachia: Feeding Mechanisms in Two Species of Telmatobius (Anura:Telmatobiidae). Anat Rec (Hoboken) 2015; 299:181-96. [PMID: 26575038 DOI: 10.1002/ar.23292] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 06/05/2015] [Indexed: 11/08/2022]
Abstract
The most common feeding mechanism among aquatic vertebrates as fishes, turtles, and salamanders is inertial suction. However, among the more than 6,400 species of anurans, suction feeding occurs only in pipids. Pipidae is a small basal lineage relative to Neobatrachia, an enormous clade that contains about 96% of extant anurans. The Andean neobatrachian frogs of the genus Telmatobius include strictly aquatic and semiaquatic species. Diet analyses indicate that some species of Telmatobius feed on strictly aquatic prey, but until now their feeding mechanisms have been unknown. Herein, the feeding mechanisms in two species of Telmatobius, that represent the two predominant modes of life in the genus, are explored. The semiaquatic T. oxycephalus and the fully aquatic T. rubigo are studied using high-speed cinematography and standard anatomical techniques to provide a qualitative approach to feeding behavior and a detailed morphological description of the mouth, tongue, hyoid and related muscles. T. oxycephalus uses similar mechanisms of aquatic prey capture as do the vast majority of anurans that are capable of forage in water, whereas the fully aquatic T. rubigo is an inertial suction feeder. This is the first report of an objective record of this unique feeding behavior in a Neobatrachian. Several morphological characters seem to be related with this function and are convergent with those of pipids.
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Affiliation(s)
- José Sebastián Barrionuevo
- División Herpetología, Museo Argentino De Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina
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23
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Karyological analyses of Pseudhymenochirus merlini and Hymenochirus boettgeri provide new insights into the chromosome evolution in the anuran family Pipidae. ZOOL ANZ 2015. [DOI: 10.1016/j.jcz.2015.07.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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24
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Cannatella D. Xenopus in Space and Time: Fossils, Node Calibrations, Tip-Dating, and Paleobiogeography. Cytogenet Genome Res 2015; 145:283-301. [PMID: 26279165 DOI: 10.1159/000438910] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Published data from DNA sequences, morphology of 11 extant and 15 extinct frog taxa, and stratigraphic ranges of fossils were integrated to open a window into the deep-time evolution of Xenopus. The ages and morphological characters of fossils were used as independent datasets to calibrate a chronogram. We found that DNA sequences, either alone or in combination with morphological data and fossils, tended to support a close relationship between Xenopus and Hymenochirus, although in some analyses this topology was not significantly better than the Pipa + Hymenochirus topology. Analyses that excluded DNA data found strong support for the Pipa + Hymenochirus tree. The criterion for selecting the maximum age of the calibration prior influenced the age estimates, and our age estimates of early divergences in the tree of frogs are substantially younger than those of published studies. Node-dating and tip-dating calibrations, either alone or in combination, yielded older dates for nodes than did a root calibration alone. Our estimates of divergence times indicate that overwater dispersal, rather than vicariance due to the splitting of Africa and South America, may explain the presence of Xenopus in Africa and its closest fossil relatives in South America.
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Affiliation(s)
- David Cannatella
- Department of Integrative Biology and Biodiversity Collections, University of Texas, Austin, Tex., USA
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25
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Guerra MA, Ryan MJ, Cannatella DC. Ontogeny of Sexual Dimorphism in the Larynx of the Túngara Frog,Physalaemus pustulosus. COPEIA 2014. [DOI: 10.1643/cg-13-051] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Characterization of the host-defense peptides from skin secretions of Merlin's clawed frog Pseudhymenochirus merlini: insights into phylogenetic relationships among the Pipidae. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2013; 8:352-7. [PMID: 24212286 DOI: 10.1016/j.cbd.2013.10.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 10/06/2013] [Accepted: 10/06/2013] [Indexed: 01/08/2023]
Abstract
The family Pipidae comprises the genera Hymenochirus, Pipa, Pseudhymenochirus, Silurana, and Xenopus but phylogenetic relationships within the family are unclear. Peptidomic analysis of norepinephrine-stimulated skin secretions from Pseudhymenochirus merlini Chabanaud, 1920, the single species within the genus Pseudhymenochirus, led to identification of 13 host-defense peptides with antimicrobial activity. Two peptides (hymenochirin-1Pa and -1Pb) show structural similarity to hymenochirin-1B from Hymenochirus boettgeri and eight peptides (hymenochirin-5Pa, -5Pb, -5Pc, -5Pd, -5Pe, -5Pf, 5Pg and -5Ph) are structurally similar to each other and to hymenochirin-5B from H. boettgeri. Two peptides differing by a single amino acid (IKIPSFFRNILKKVGKEAVSLM/I AGALKQS), termed pseudhymenochirin-1Pa and -1Pb, and pseudhymenochirin-2Pa (GIFPIFAKLLGKVIKVASSLISKGRTE) do not resemble host-defense peptides previously isolated from pipid frogs. Hymenochirin-5Pe was the most abundant peptide in the secretions and hymenochirin-1Pa the most potent against Staphylococcus aureus (MIC=2.5μM) and Escherichia coli (MIC=10μM). The data support a close phylogenetic relationship between Hymenochirus and Pseudhymenochirus that is distinct from the Xenopodinae (Xenopus+Silurana) clade with Pipa sister-group to all other extant pipids.
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Meza-joya FL, Ramos-pallares EP, RamÍrez-pinilla MP. Ontogeny of the Vertebral Column ofEleutherodactylus johnstonei(Anura: Eleutherodactylidae) Reveals Heterochronies Relative to Metamorphic Frogs. Anat Rec (Hoboken) 2013; 296:1019-30. [DOI: 10.1002/ar.22705] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 03/21/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Fabio Leonardo Meza-joya
- Colección Herpetológica y Laboratorio de Biología Reproductiva de Vertebrados; Grupo de Estudios en Biodiversidad, Escuela de Biología, Universidad Industrial de Santander; A.A. 678, Cra 27 calle 9 Bucaramanga Colombia
| | - Eliana Patricia Ramos-pallares
- Colección Herpetológica y Laboratorio de Biología Reproductiva de Vertebrados; Grupo de Estudios en Biodiversidad, Escuela de Biología, Universidad Industrial de Santander; A.A. 678, Cra 27 calle 9 Bucaramanga Colombia
| | - Martha Patricia RamÍrez-pinilla
- Colección Herpetológica y Laboratorio de Biología Reproductiva de Vertebrados; Grupo de Estudios en Biodiversidad, Escuela de Biología, Universidad Industrial de Santander; A.A. 678, Cra 27 calle 9 Bucaramanga Colombia
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28
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Mechkarska M, Prajeep M, Coquet L, Leprince J, Jouenne T, Vaudry H, King JD, Conlon JM. The hymenochirins: a family of host-defense peptides from the Congo dwarf clawed frog Hymenochirus boettgeri (Pipidae). Peptides 2012; 35:269-75. [PMID: 22497805 DOI: 10.1016/j.peptides.2012.03.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 03/27/2012] [Accepted: 03/27/2012] [Indexed: 10/28/2022]
Abstract
Skin secretions of frogs from the subfamily Xenopodinae (Xenopus+Silurana) within the family Pipidae are a rich source of antimicrobial peptides with therapeutic potential but species from the sister taxon Hymenochirus in the subfamily Pipinae (Hymenochirus+Pseudhymenochirus+Pipa) have not been investigated. Peptidomic analysis of norepinephrine-stimulated skin secretions from two distinct populations of the Congo dwarf clawed frog Hymenochirus boettgeri (Tornier, 1896) has led to identification of five structurally related peptides with broad-spectrum antimicrobial activity. Hymenochirin-1B (IKLSPETKDNLKKVLKGAIKGAIAVAKMV.NH(2)) is C-terminally α-amidated whereas hymenochirins-2B-5B have the general structure XKIPX(2)VKDTLKKVAKGX(2)SX(2)AGAX(3).COOH. Hymenochirin-3B (IKIPAVVKDTLKKVAKGVLSAVAGALTQ) was the most abundant peptide in the secretions. The hymenochirins show very low structural similarity with the antimicrobial peptides isolated from skin secretions of Silurana tropicalis and Xenopus laevis consistent with the proposed ancient divergence of the Pipinae and Xenopodinae. Synthetic replicates of hymenochirin-1B-4B inhibit the growth of Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Staphylococcus aureus (MIC in the range 10-40 μM) and Candida albicans (MIC=80 μM). The peptides display relatively weak hemolytic activity against human erythrocytes (LC(50) in the range 160 to >300 μM).
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Affiliation(s)
- Milena Mechkarska
- Department of Biochemistry, Faculty of Medicine and Health Sciences, United Arab Emirates University, 17666 Al-Ain, United Arab Emirates
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Affiliation(s)
- Adam J. Bewick
- Department of Biology, Life Sciences Building Room 328, McMaster University, 1280 Main Street West Hamilton, ON L8S 4K1, Canada
| | - Frédéric J. J. Chain
- Department of Biology, Life Sciences Building Room 328, McMaster University, 1280 Main Street West Hamilton, ON L8S 4K1, Canada
- Present address: Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann-Str. 2, 24306 Plön, Germany
| | - Joseph Heled
- Department of Computer Science, University of Auckland, Auckland 1142, New Zealand
| | - Ben J. Evans
- Department of Biology, Life Sciences Building Room 328, McMaster University, 1280 Main Street West Hamilton, ON L8S 4K1, Canada
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30
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Fernandes TL, Antoniazzi MM, Sasso-Cerri E, Egami MI, Lima C, Rodrigues MT, Jared C. Carrying Progeny on the Back: Reproduction in the Brazilian Aquatic FrogPipa carvalhoi. SOUTH AMERICAN JOURNAL OF HERPETOLOGY 2011. [DOI: 10.2994/057.006.0302] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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31
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Benzekri NA, Reiss JO. Olfactory metamorphosis in the coastal tailed frog Ascaphus truei (Amphibia, Anura, Leiopelmatidae). J Morphol 2011; 273:68-87. [PMID: 21935974 DOI: 10.1002/jmor.11008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Revised: 06/09/2011] [Accepted: 06/28/2011] [Indexed: 11/10/2022]
Abstract
The structure of the olfactory organ in larvae and adults of the basal anuran Ascaphus truei was examined using light micrography, electron micrography, and resin casts of the nasal cavity. The larval olfactory organ consists of nonsensory anterior and posterior nasal tubes connected to a large, main olfactory cavity containing olfactory epithelium; the vomeronasal organ is a ventrolateral diverticulum of this cavity. A small patch of olfactory epithelium (the "epithelial band") also is present in the preoral buccal cavity, anterolateral to the choana. The main olfactory epithelium and epithelial band have both microvillar and ciliated receptor cells, and both microvillar and ciliated supporting cells. The epithelial band also contains secretory ciliated supporting cells. The vomeronasal epithelium contains only microvillar receptor cells. After metamorphosis, the adult olfactory organ is divided into the three typical anuran olfactory chambers: the principal, middle, and inferior cavities. The anterior part of the principal cavity contains a "larval type" epithelium that has both microvillar and ciliated receptor cells and both microvillar and ciliated supporting cells, whereas the posterior part is lined with an "adult-type" epithelium that has only ciliated receptor cells and microvillar supporting cells. The middle cavity is nonsensory. The vomeronasal epithelium of the inferior cavity resembles that of larvae but is distinguished by a novel type of microvillar cell. The presence of two distinct types of olfactory epithelium in the principal cavity of adult A. truei is unique among previously described anuran olfactory organs. A comparative review suggests that the anterior olfactory epithelium is homologous with the "recessus olfactorius" of other anurans and with the accessory nasal cavity of pipids and functions to detect water-borne odorants.
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Affiliation(s)
- Noëlle A Benzekri
- Department of Biological Sciences, Humboldt State University, Arcata, California 95521, USA
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Genome duplications within the Xenopodinae do not increase the multiplicity of antimicrobial peptides in Silurana paratropicalis and Xenopus andrei skin secretions. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2011; 6:206-12. [DOI: 10.1016/j.cbd.2011.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Revised: 03/30/2011] [Accepted: 03/30/2011] [Indexed: 01/12/2023]
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Irisarri I, Vences M, San Mauro D, Glaw F, Zardoya R. Reversal to air-driven sound production revealed by a molecular phylogeny of tongueless frogs, family Pipidae. BMC Evol Biol 2011; 11:114. [PMID: 21524293 PMCID: PMC3111386 DOI: 10.1186/1471-2148-11-114] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 04/27/2011] [Indexed: 11/24/2022] Open
Abstract
Background Evolutionary novelties often appear by conferring completely new functions to pre-existing structures or by innovating the mechanism through which a particular function is performed. Sound production plays a central role in the behavior of frogs, which use their calls to delimit territories and attract mates. Therefore, frogs have evolved complex vocal structures capable of producing a wide variety of advertising sounds. It is generally acknowledged that most frogs call by moving an air column from the lungs through the glottis with the remarkable exception of the family Pipidae, whose members share a highly specialized sound production mechanism independent of air movement. Results Here, we performed behavioral observations in the poorly known African pipid genus Pseudhymenochirus and document that the sound production in this aquatic frog is almost certainly air-driven. However, morphological comparisons revealed an indisputable pipid nature of Pseudhymenochirus larynx. To place this paradoxical pattern into an evolutionary framework, we reconstructed robust molecular phylogenies of pipids based on complete mitochondrial genomes and nine nuclear protein-coding genes that coincided in placing Pseudhymenochirus nested among other pipids. Conclusions We conclude that although Pseudhymenochirus probably has evolved a reversal to the ancestral non-pipid condition of air-driven sound production, the mechanism through which it occurs is an evolutionary innovation based on the derived larynx of pipids. This strengthens the idea that evolutionary solutions to functional problems often emerge based on previous structures, and for this reason, innovations largely depend on possibilities and constraints predefined by the particular history of each lineage.
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Affiliation(s)
- Iker Irisarri
- Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain
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Kashiwagi K, Kashiwagi A, Kurabayashi A, Hanada H, Nakajima K, Okada M, Takase M, Yaoita Y. Xenopus tropicalis: an ideal experimental animal in amphibia. Exp Anim 2010; 59:395-405. [PMID: 20660986 DOI: 10.1538/expanim.59.395] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Studies using amphibians have contributed to the progress of life science including developmental biology and cell biology for more than one hundred years. Since the 1950s Xenopus laevis in particular has been used by scientists in many fields for experiments, resulting in the development of various techniques such as microsurgery on early embryos, biosynthesis of gene-encoded protein in oocytes by mRNA injection, misexpression experiments by mRNA injection into embryos, gene knockdown studies by injection of morpholino anti-sense oligonucleotide into fertilized eggs, transgenesis by the I-SceI meganuclease method, and so on. In this paper we will introduce Xenopus tropicalis as an alternative experimental animal. It has a shorter generation time and smaller diploid genome, together with whole-genome sequence data. The procedures available for Xenopus laevis can work well with Xenopus tropicalis, and embryos of both species develop at similar rates according to the developmental staging system of Nieuwkoop and Faber. Experimental systems of Xenopus tropicalis will pave the way for a new era of vertebrate genomics and genetics.
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Affiliation(s)
- Keiko Kashiwagi
- Division of Embryology and Genetics, Institute for Amphibian Biology, Graduate School of Science, Hiroshima University, Higashihiroshima, Japan
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35
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Carreño CA, Nishikawa KC. Aquatic feeding in pipid frogs: the use of suction for prey capture. ACTA ACUST UNITED AC 2010; 213:2001-8. [PMID: 20511513 DOI: 10.1242/jeb.043380] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Inertial suction feeding is the most common method of prey capture among aquatic vertebrates. However, it had been unclear whether the aquatic frogs in the family Pipidae also used inertial suction for prey capture. In this study, we examined feeding behavior in four species of pipids, Pipa pipa, Xenopus laevis, Hymenochirus boettgeri and Pseudhymenochirus merlini. Pressure in the buccopharyngeal cavity was measured during prey capture. These pressure measurements were coupled with high-speed recordings of feeding behavior. For each species, the internal buccopharyngeal pressure was found to drop significantly below ambient pressure, and changes in pressure corresponded with the onset of mouth opening. Kinematic analysis revealed that all species of pipids generated subambient pressure during prey capture; H. boettgeri and P. merlini relied solely on inertial suction feeding. Pipa pipa and X. laevis additionally employed forelimb scooping during prey capture but both of these species demonstrated the ability to capture prey with inertial suction alone. Based on buccopharyngeal pressure measurements as well as kinematic analyses, we conclude that inertial suction feeding is used during prey capture in these four species of pipids.
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Affiliation(s)
- Carrie A Carreño
- Northern Arizona University, Department of Biological Sciences, PO Box 5640, Flagstaff, AZ 86011, USA.
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36
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Conlon JM, Al-Ghaferi N, Ahmed E, Meetani MA, Leprince J, Nielsen PF. Orthologs of magainin, PGLa, procaerulein-derived, and proxenopsin-derived peptides from skin secretions of the octoploid frog Xenopus amieti (Pipidae). Peptides 2010; 31:989-94. [PMID: 20226221 DOI: 10.1016/j.peptides.2010.03.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2010] [Revised: 03/02/2010] [Accepted: 03/02/2010] [Indexed: 11/16/2022]
Abstract
The Volcano clawed frog Xenopus amieti Kobel, du Pasquier, Fischberg, and Gloor, 1980, with a chromosome number of 2n=72, is believed to have undergone two rounds of genome duplication since evolving from a diploid ancestor. Nine peptides with differential antimicrobial activity against Escherichia coli and Staphylococcus aureus were isolated from norepinephrine-stimulated skin secretions of X. amieti that showed structural similarity to peptides previously isolated from the tetraploid frog X. laevis (2n=36) and the diploid frog Silurana (formerly Xenopus) tropicalis (2n=20). Two peptides (magainin-AM1 and -AM2) are othologous to the magainins, two peptides (PGLa-AM1 and -AM2) orthologous to peptide glycine-leucine-amide, four peptides (CPF-AM1, -AM2, -AM3, -AM4) orthologous to caerulein-precursor fragments, and one peptide (XPF-AM1) structurally similar to xenopsin-precursor fragments were characterized. CFP-AM1 (GLGSVLGKALKIGANLL.NH(2)) was the most potent peptide present in the secretions and magainin-AM2 (GVSKILHSAGKFGKAFLGEIMKS) was the most abundant. The data indicate that nonfunctionalization has been the most common fate of duplicated antimicrobial peptide genes following the polyploidization events in the X. amieti lineage. However, the very low antimicrobial activity of the magainin-AM1 and PGLa-AM2 paralogs suggests the possibility that certain peptides may have evolved toward a new, as yet undetermined, function (neofunctionalization).
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Affiliation(s)
- J Michael Conlon
- Department of Biochemistry, Faculty of Medicine and Health Sciences, United Arab Emirates University, 17666 Al-Ain, United Arab Emirates.
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37
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Langlois VS, Duarte-Guterman P, Ing S, Pauli BD, Cooke GM, Trudeau VL. Fadrozole and finasteride exposures modulate sex steroid- and thyroid hormone-related gene expression in Silurana (Xenopus) tropicalis early larval development. Gen Comp Endocrinol 2010; 166:417-27. [PMID: 19917284 DOI: 10.1016/j.ygcen.2009.11.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 11/03/2009] [Accepted: 11/10/2009] [Indexed: 11/19/2022]
Abstract
Steroidogenic enzymes and their steroid products play critical roles during gonadal differentiation in amphibians; however their roles during embryogenesis remain unclear. The objective of this study was to investigate the expression and activity of aromatase (cyp19; estrogen synthase) and 5 beta-reductase (srd5 beta; 5 beta-dihydrotestosterone synthase) during amphibian embryogenesis. Expression and activity profiles of cyp19 and srd5 beta were first established during Silurana (Xenopus) tropicalis embryogenesis from Nieuwkoop-Faber (NF) stage 2 (2-cell stage; 1h post-fertilization) to NF stage 46 (beginning of feeding; 72 h post-fertilization). Exposures to fadrozole (an aromatase inhibitor; 0.5, 1.0 and 2.0 microM) and finasteride (a putative 5-reductase inhibitor; 25, 50 and 100 microM) were designed to assess the consequences of inhibiting these enzymes on gene expression in early amphibian larval development. Exposed embryos showed changes in both enzyme activities and sex steroid- and thyroid hormone-related gene expression. Fadrozole treatment inhibited cyp19 activity and increased androgen receptor and thyroid hormone receptor (alpha and beta) mRNAs. Finasteride treatment inhibited srd5 beta (activity and mRNA), decreased cyp19 mRNA and activity levels and increased estrogen receptor alpha mRNA. Both treatments altered the expression of deiodinases (thyroid hormone metabolizing enzymes). We conclude that cyp19 and srd5 beta are active in early embryogenesis and larval development in Silurana tropicalis and their inhibition affected transcription of genes associated with the thyroid and reproductive axes.
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Affiliation(s)
- Valérie S Langlois
- Centre for Advanced Research in Environmental Genomics, Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
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Duarte-Guterman P, Langlois VS, Pauli BD, Trudeau VL. Expression and T3 regulation of thyroid hormone- and sex steroid-related genes during Silurana (Xenopus) tropicalis early development. Gen Comp Endocrinol 2010; 166:428-35. [PMID: 20015451 DOI: 10.1016/j.ygcen.2009.12.008] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 12/01/2009] [Accepted: 12/05/2009] [Indexed: 11/26/2022]
Abstract
In amphibians, thyroid hormones (THs) are the primary regulators of metamorphosis; however, their physiological role during embryogenesis remains unclear. First, we established complete developmental profiles for TH receptors (tr alpha and tr beta), deiodinases (dio; types 1, 2, 3), estrogen receptors (er alpha and er beta) and androgen receptor (ar) mRNA levels during embryogenesis and early larval stages in Silurana (Xenopus) tropicalis (from Nieuwkoop and Faber (NF) stage 2 until NF 46). Real-time RT-PCR analyses in whole embryos and larvae revealed that all transcripts except tr alpha were detected throughout development; tr alpha only appears after gastrulation. The first significant increase in the expression of tralpha and tr beta was observed before hatching, between NF 21 and NF 27 (2.5- and 11-fold, respectively). In order to test if these genes could be regulated by THs during early larval development, embryos were exposed to triiodothyronine (T3; 0.5, 5.0, 50 nM) from NF 27 to NF 46. T3 exposure caused a dose-dependent increase relative to control in the expression of tr alpha, tr beta, dio (types 2 and 3), ar, and 5 alpha-reductase type 1 in whole larvae. These results indicate that in S. tropicalis, tr and dio can be induced by T3 as early as NF 46, a response that had only been characterized later during frog metamorphosis. In addition, T3 also affected androgen-related gene expression, supporting our hypothesis that THs are involved in male development in frogs.
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Affiliation(s)
- Paula Duarte-Guterman
- Centre for Advanced Research in Environmental Genomics, Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
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39
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Pugener LA, Maglia AM. Developmental Evolution of the Anuran Sacro-Urostylic Complex. SOUTH AMERICAN JOURNAL OF HERPETOLOGY 2009. [DOI: 10.2994/057.004.0301] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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40
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Pugener LA, Maglia AM. Skeletal morphogenesis of the vertebral column of the miniature hylid frog Acris crepitans, with comments on anomalies. J Morphol 2009; 270:52-69. [PMID: 18946872 DOI: 10.1002/jmor.10665] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Although the vertebral columns of anurans have received much study in the last 150 years, few detailed descriptions exist of the skeletal morphogenesis of this anatomical unit. Herein, the ontogeny of the vertebral skeleton of the hylid frog Acris crepitans is described based on cleared and double-stained specimens, radiographs, and 3D reconstructions generated from synchrotron microCT scans. The adult axial formula is 1-7-1-1, and the vertebral centra are epichordal and procoelous. The neural arches are nonimbricate, and there is a medial articulation between the laminae of Presacrals I and II. Free ribs are absent. The sacral diapophyses are uniform in width or slightly expanded distally. The urostyle is slender, round in cross section, and about equal in length to the presacral region. Presacral vertebrae are the first to form, developing in a cephalic-to-caudal sequence. However, development and growth are decoupled and growth is fastest initially in the posterior presacrals and sacrum. In addition, there is a time lag between the formation of the presacral/sacral region and the postsacral region. More than 8.5% of the specimens examined have vertebral anomalies, and about 50% display small variants from the typical vertebral column morphology. However, these malformations do not seem to have been so severe as to have affected survival.
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Affiliation(s)
- L Analía Pugener
- Department of Biological Sciences, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
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41
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Laurin M, Canoville A, Quilhac A. Use of paleontological and molecular data in supertrees for comparative studies: the example of lissamphibian femoral microanatomy. J Anat 2009; 215:110-23. [PMID: 19508493 DOI: 10.1111/j.1469-7580.2009.01104.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
A new method to assemble time-calibrated supertrees is able to incorporate paleontological and molecular dates. This method, along with new branch length transformations, is implemented in the Stratigraphic Tools for Mesquite. It was used here to analyse a dataset on bone microanatomy, body size and habitat of 46 species of lissamphibians through a variety of methods (Felsenstein independent contrasts, variance partition with phylogenetic eigenvector regression, discriminant analyses and simple regressions). Our analyses showed that the new methods can produce adequate standardization for several characters on a tree whose branch lengths can represent evolutionary time. The analyses confirmed previous conclusions about the presence of an ecological signal in bone microanatomical data.
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Affiliation(s)
- Michel Laurin
- UMR 7179, Equipe squelette des vertebrés, Université Paris 6, Paris, France.
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42
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43
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ROČEK ZBYNĚK. Ethmoidal endocranial structures in primitive tetrapods: their bearing on the search for anuran ancestry. Zool J Linn Soc 2008. [DOI: 10.1111/j.1096-3642.1990.tb00560.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Gargaglioni LH, Milsom WK. Control of breathing in anuran amphibians. Comp Biochem Physiol A Mol Integr Physiol 2006; 147:665-684. [PMID: 16949847 DOI: 10.1016/j.cbpa.2006.06.040] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Revised: 06/21/2006] [Accepted: 06/24/2006] [Indexed: 11/27/2022]
Abstract
The primary role of the respiratory system is to ensure adequate tissue oxygenation, eliminate carbon dioxide and help to regulate acid-base status. To maintain this homeostasis, amphibians possess an array of receptors located at peripheral and central chemoreceptive sites that sense respiration-related variables in both internal and external environments. As in mammals, input from these receptors is integrated at central rhythmogenic and pattern-forming elements in the medulla in a manner that meets the demands determined by the environment within the constraints of the behavior and breathing pattern of the animal. Also as in mammals, while outputs from areas in the midbrain may modulate respiration directly, they do not play a significant role in the production of the normal respiratory rhythm. However, despite these similarities, the breathing patterns of the two classes are different: mammals maintain homeostasis of arterial blood gases through rhythmic and continuous breathing, whereas amphibians display an intermittent pattern of aerial respiration. While the latter is also often rhythmic, it allows a degree of fluctuation in key respiratory variables that has led some to suggest that control is not as tight in these animals. In this review we will focus specifically on recent advances in studies of the control of ventilation in anuran amphibians. This is the group of amphibians that has attracted the most recent attention from respiratory physiologists.
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Affiliation(s)
- Luciane H Gargaglioni
- Department of Animal Morphology and Physiology, Sao Paulo State University-FCAV at Jaboticabal, SP, Brazil.
| | - William K Milsom
- Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
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FROST DARRELR, GRANT TARAN, FAIVOVICH JULIÁN, BAIN RAOULH, HAAS ALEXANDER, HADDAD CÉLIOF, DE SÁ RAFAELO, CHANNING ALAN, WILKINSON MARK, DONNELLAN STEPHENC, RAXWORTHY CHRISTOPHERJ, CAMPBELL JONATHANA, BLOTTO BORISL, MOLER PAUL, DREWES ROBERTC, NUSSBAUM RONALDA, LYNCH JOHND, GREEN DAVIDM, WHEELER WARDC. THE AMPHIBIAN TREE OF LIFE. BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY 2006. [DOI: 10.1206/0003-0090(2006)297[0001:tatol]2.0.co;2] [Citation(s) in RCA: 1225] [Impact Index Per Article: 68.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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46
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47
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Haas A. Phylogeny of frogs as inferred from primarily larval characters (Amphibia:Anura)★. Cladistics 2005; 19:23-89. [DOI: 10.1111/j.1096-0031.2003.tb00405.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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48
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Singletary KG, Delville Y, Farrell WJ, Wilczynski W. Distribution of orexin/hypocretin immunoreactivity in the nervous system of the green Treefrog, Hyla cinerea. Brain Res 2005; 1041:231-6. [PMID: 15829232 DOI: 10.1016/j.brainres.2005.01.095] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2004] [Revised: 01/27/2005] [Accepted: 01/31/2005] [Indexed: 11/18/2022]
Abstract
We examined the distribution of orexin/hypocretin immunoreactive neurons and projections throughout the brain of the green treefrog (Hyla cinerea). Orexin A and B neurons were located in a single population centered on the suprachiasmatic nucleus. Orexin A and B fibers were visible across the brain, with the highest density within the preoptic area and hypothalamus. Our data suggest different distributions of orexin neurons but not projections between families of amphibians.
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Affiliation(s)
- Kristan G Singletary
- Psychology Department and Institute for Neuroscience, University of Texas, Austin, TX 78712, USA.
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49
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Evans BJ, Kelley DB, Tinsley RC, Melnick DJ, Cannatella DC. A mitochondrial DNA phylogeny of African clawed frogs: phylogeography and implications for polyploid evolution. Mol Phylogenet Evol 2004; 33:197-213. [PMID: 15324848 DOI: 10.1016/j.ympev.2004.04.018] [Citation(s) in RCA: 212] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2004] [Revised: 04/20/2004] [Indexed: 11/26/2022]
Abstract
The African clawed frogs (Silurana and Xenopus), model organisms for scientific inquiry, are unusual in that allopolyploidization has occurred on multiple occasions, giving rise to tetraploid, octoploid, and dodecaploid species. To better understand their evolution, here we estimate a mitochondrial DNA phylogeny from all described and some undescribed species. We examine the timing and location of diversification, and test hypotheses concerning the frequency of polyploid speciation and taxonomy. Using a relaxed molecular clock, we estimate that extant clawed frog lineages originated well after the breakup of Gondwana, about 63.7 million years ago, with a 95% confidence interval from 50.4 to 81.3 million years ago. Silurana and two major lineages of Xenopus have overlapping distributions in sub-Saharan Africa, and dispersal-vicariance analysis suggests that clawed frogs originated in central and/or eastern equatorial Africa. Most or all extant species originated before the Pleistocene; recent rainforest refugia probably acted as "lifeboats" that preserved existing species, rather than "species pumps" where many new successful lineages originated. We estimate that polyploidization occurred at least six times in clawed frogs.
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Affiliation(s)
- Ben J Evans
- Department of Biology, McMaster University, Life Sciences Building, Room 328, 1280 Main Street West, Hamilton, Ont., Canada.
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50
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Dean MN. Suction Feeding in the Pipid Frog, Hymenochirus boettgeri: Kinematic and Behavioral Considerations. COPEIA 2003. [DOI: 10.1643/h203-048.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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