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Szynwelski BE, Mares-Guia MAMM, Filippis AMB, Gonçalves GL, Tokuda M, Wagner PGC, Wu S, Oliveira VP, Lima MGM, Lynch JW, Freitas TRO. Phylogeography, genetic diversity, and intraspecific genetic structure of the black-horned capuchin (Sapajus nigritus). Am J Primatol 2024; 86:e23566. [PMID: 37855375 DOI: 10.1002/ajp.23566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 10/03/2023] [Accepted: 10/07/2023] [Indexed: 10/20/2023]
Abstract
Recent molecular studies have clarified the overarching taxonomy of capuchin monkeys, but intraspecific genetic diversity remains unexplored for most capuchin species. One example is Sapajus nigritus, the southernmost capuchin monkey, found in Brazil and Argentina; its phenotypic diversity has been recognized as two geographic subspecies, but the intraspecific genetic structure of this taxon is poorly known. Here, we sampled across most of this species' geographic distribution, producing a newly sequenced data set for genetic analyses that included 78 individuals from 14 populations. We investigated the intraspecific diversity, genetic structure, and evolutionary history using three mitochondrial markers. Our results indicated that S. nigritus populations exhibited high levels of genetic structure. We found strong support for two monophyletic clades within this species with a deep phylogenetic split, and clear separation from other related taxa. Vicariance events seem to have played a prevalent role in shaping S. nigritus genetic differentiation. The Paraíba do Sul River may have driven the deep divergence between southern and northern clades, whereas the Tietê River may have had a weaker, more recent effect on the divergence of populations within the southern clade.
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Affiliation(s)
- Bruna E Szynwelski
- Laboratório de Citogenética e Evolução, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Maria A M M Mares-Guia
- Fiocruz (Fundação Oswaldo Cruz), Laboratório de Flavivírus, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Ana M B Filippis
- Fiocruz (Fundação Oswaldo Cruz), Laboratório de Flavivírus, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Gislene L Gonçalves
- Departamento de Recursos Ambientales, Facultad de Ciencias Agronómicas, Universidad de Tarapacá, Arica, Chile
| | - Marcos Tokuda
- Parque Zoológico Municipal Quinzinho de Barros, Sorocaba, Brazil
- Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brazil
| | - Paulo G C Wagner
- Centro de Triagem de Animais Silvestres, Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis, Porto Alegre, Rio Grande do Sul, Brazil
| | - Stacy Wu
- Departamento de Ciência Animal, Universidade Federal do Paraná, Programa de Pós-Graduação em Ciência Animal, Setor Palotina, Palotina, Brazil
| | | | - Marcela G M Lima
- Laboratório de Biogeografia da Conservação e Macroecologia, Departamento de Ecologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil
| | - Jessica W Lynch
- Institute for Society and Genetics and Department of Anthropology, University of California-Los Angeles, Los Angeles, California, USA
- Department of Anthropology, University of California, Los Angeles, California
| | - Thales R O Freitas
- Laboratório de Citogenética e Evolução, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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2
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Pratt EAL, Beheregaray LB, Fruet P, Tezanos-Pinto G, Bilgmann K, Zanardo N, Diaz-Aguirre F, Secchi ER, Freitas TRO, Möller LM. Genomic Divergence and the Evolution of Ecotypes in Bottlenose Dolphins (Genus Tursiops). Genome Biol Evol 2023; 15:evad199. [PMID: 37935115 PMCID: PMC10655200 DOI: 10.1093/gbe/evad199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 10/03/2023] [Accepted: 10/14/2023] [Indexed: 11/09/2023] Open
Abstract
Climatic changes have caused major environmental restructuring throughout the world's oceans. Marine organisms have responded to novel conditions through various biological systems, including genomic adaptation. Growing accessibility of next-generation DNA sequencing methods to study nonmodel species has recently allowed genomic changes underlying environmental adaptations to be investigated. This study used double-digest restriction-site associated DNA (ddRAD) sequence data to investigate the genomic basis of ecotype formation across currently recognized species and subspecies of bottlenose dolphins (genus Tursiops) in the Southern Hemisphere. Subspecies-level genomic divergence was confirmed between the offshore common bottlenose dolphin (T. truncatus truncatus) and the inshore Lahille's bottlenose dolphin (T. t. gephyreus) from the southwestern Atlantic Ocean (SWAO). Similarly, subspecies-level divergence is suggested between inshore (eastern Australia) Indo-Pacific bottlenose dolphin (T. aduncus) and the proposed Burrunan dolphin (T. australis) from southern Australia. Inshore bottlenose dolphin lineages generally had lower genomic diversity than offshore lineages, a pattern particularly evident for T. t. gephyreus, which showed exceptionally low diversity. Genomic regions associated with cardiovascular, musculoskeletal, and energy production systems appear to have undergone repeated adaptive evolution in inshore lineages across the Southern Hemisphere. We hypothesize that comparable selective pressures in the inshore environment drove similar adaptive responses in each lineage, supporting parallel evolution of inshore bottlenose dolphins. With climate change altering marine ecosystems worldwide, it is crucial to gain an understanding of the adaptive capacity of local species and populations. Our study provides insights into key adaptive pathways that may be important for the long-term survival of cetaceans and other organisms in a changing marine environment.
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Affiliation(s)
- Eleanor A L Pratt
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Luciano B Beheregaray
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Pedro Fruet
- Laboratório de Ecologia e Conservação da Megafauna Marinha (ECOMEGA), Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Museu Oceanográfico Prof. Eliézer de C. Rios, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Kaosa, Rio Grande, Brazil
| | | | - Kerstin Bilgmann
- Department of Biological Sciences, Macquarie University, North Ryde, New South Wales, Australia
| | - Nikki Zanardo
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Department of Environment and Water, Adelaide, South Australia, Australia
| | - Fernando Diaz-Aguirre
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Eduardo R Secchi
- Laboratório de Ecologia e Conservação da Megafauna Marinha (ECOMEGA), Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Museu Oceanográfico Prof. Eliézer de C. Rios, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Thales R O Freitas
- Laboratório de Citogenética e Evolução, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luciana M Möller
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
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3
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Carroll EL, Ott PH, McMillan LF, Galletti Vernazzani B, Neveceralova P, Vermeulen E, Gaggiotti OE, Andriolo A, Baker CS, Bamford C, Best P, Cabrera E, Calderan S, Chirife A, Fewster RM, Flores PAC, Frasier T, Freitas TRO, Groch K, Hulva P, Kennedy A, Leaper R, Leslie MS, Moore M, Oliveira L, Seger J, Stepien EN, Valenzuela LO, Zerbini A, Jackson JA. Genetic Diversity and Connectivity of Southern Right Whales (Eubalaena australis) Found in the Brazil and Chile-Peru Wintering Grounds and the South Georgia (Islas Georgias del Sur) Feeding Ground. J Hered 2021; 111:263-276. [PMID: 32347944 PMCID: PMC7238439 DOI: 10.1093/jhered/esaa010] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 04/21/2020] [Indexed: 01/05/2023] Open
Abstract
As species recover from exploitation, continued assessments of connectivity and population structure are warranted to provide information for conservation and management. This is particularly true in species with high dispersal capacity, such as migratory whales, where patterns of connectivity could change rapidly. Here we build on a previous long-term, large-scale collaboration on southern right whales (Eubalaena australis) to combine new (nnew) and published (npub) mitochondrial (mtDNA) and microsatellite genetic data from all major wintering grounds and, uniquely, the South Georgia (Islas Georgias del Sur: SG) feeding grounds. Specifically, we include data from Argentina (npub mtDNA/microsatellite = 208/46), Brazil (nnew mtDNA/microsatellite = 50/50), South Africa (nnew mtDNA/microsatellite = 66/77, npub mtDNA/microsatellite = 350/47), Chile-Peru (nnew mtDNA/microsatellite = 1/1), the Indo-Pacific (npub mtDNA/microsatellite = 769/126), and SG (npub mtDNA/microsatellite = 8/0, nnew mtDNA/microsatellite = 3/11) to investigate the position of previously unstudied habitats in the migratory network: Brazil, SG, and Chile-Peru. These new genetic data show connectivity between Brazil and Argentina, exemplified by weak genetic differentiation and the movement of 1 genetically identified individual between the South American grounds. The single sample from Chile-Peru had an mtDNA haplotype previously only observed in the Indo-Pacific and had a nuclear genotype that appeared admixed between the Indo-Pacific and South Atlantic, based on genetic clustering and assignment algorithms. The SG samples were clearly South Atlantic and were more similar to the South American than the South African wintering grounds. This study highlights how international collaborations are critical to provide context for emerging or recovering regions, like the SG feeding ground, as well as those that remain critically endangered, such as Chile-Peru.
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Affiliation(s)
- Emma L Carroll
- School of Biological Sciences, University of Auckland, Auckland, New Zealand.,School of Biology, University of St Andrews, St Andrews, UK
| | - Paulo H Ott
- Grupo de Estudos de Mamíferos Aquáticos do Rio Grande do Sul, Torres, RS, Brazil.,Universidade Estadual do Rio Grande do Sul, Osório, RS, Brazil
| | - Louise F McMillan
- School of Mathematics and Statistics, Victoria University of Wellington, Wellington, New Zealand
| | | | - Petra Neveceralova
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic.,Ivanhoe Sea Safaris, Gansbaai, South Africa.,Dyer Island Conservation Trust, Great White House, Kleinbaai, Gansbaai, South Africa
| | - Els Vermeulen
- Mammal Research Institute Whale Unit, Department of Zoology and Entomology, University of Pretoria, Hatfield, South Africa
| | | | - Artur Andriolo
- Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Campus Universitário, Juiz de Fora, MG, Brazil.,Instituto Aqualie, Juiz de Fora, MG, Brazil
| | - C Scott Baker
- Marine Mammal Institute and Department of Fisheries and Wildlife, Oregon State University, Newport, OR
| | - Connor Bamford
- British Antarctic Survey, Cambridge, UK.,University of Southampton, Southampton, UK
| | | | - Elsa Cabrera
- Centro de Conservación Cetacea-Casilla 19178 Correo 19, Santiago, Chile
| | | | - Andrea Chirife
- Instituto de Ciencias Biomédicas (ICB), Universidad Andrés Bello, Chile
| | - Rachel M Fewster
- Department of Statistics, University of Auckland, Auckland, New Zealand
| | - Paulo A C Flores
- Área de Proteção Ambiental (Environmental Protection Area) Anhatomirim, ICMBio, MMA, Florianópolis, SC, Brazil
| | - Timothy Frasier
- Department of Biology, Saint Mary's University, Halifax, Nova Scotia, Canada
| | - Thales R O Freitas
- Programa de Pós-Graduação em Genética e Biologia Molecular- Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Karina Groch
- Instituto Australis, Imbituba, Santa Catarina, Brazil
| | - Pavel Hulva
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic.,Department of Biology and Ecology, University of Ostrava, Ostrava, Czech Republic
| | - Amy Kennedy
- Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Seattle, WA
| | | | | | - Michael Moore
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA
| | - Larissa Oliveira
- Universidade Estadual do Rio Grande do Sul, Osório, RS, Brazil.,Laboratório de Ecologia de Mamíferos, Universidade do Vale do Rio dos Sinos, Centro de Ciências da Saúde, Sao Leopoldo, RS, Brazil
| | - Jon Seger
- School of Biological Sciences, University of Utah, Salt Lake City, UT
| | - Emilie N Stepien
- Section of Marine Mammal Research, Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - Luciano O Valenzuela
- School of Biological Sciences, University of Utah, Salt Lake City, UT.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Ecología Evolutiva Humana, UNCPBA, Quequén, Buenos Aires Province, Argentina.,Instituto de Conservación de Ballenas, Ciudad Autónoma de Buenos Aires, Argentina
| | - Alexandre Zerbini
- Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, Seattle, WA.,Marine Ecology and Telemetry Research, Seabeck, WA.,Joint Institute for the Study of the Atmosphere and Ocean (JISAO), University of Washington, Seattle, WA
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4
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Gonçalves GL, Maestri R, Moreira GRP, Jacobi MAM, Freitas TRO, Hoekstra HE. Divergent genetic mechanism leads to spiny hair in rodents. PLoS One 2018; 13:e0202219. [PMID: 30118524 PMCID: PMC6097693 DOI: 10.1371/journal.pone.0202219] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 07/30/2018] [Indexed: 11/18/2022] Open
Abstract
Spines, or modified hairs, have evolved multiple times in mammals, particularly in rodents. In this study, we investigated the evolution of spines in six rodent families. We first measured and compared the morphology and physical properties of hairs between paired spiny and non-spiny sister lineages. We found two distinct hair morphologies had evolved repeatedly in spiny rodents: hairs with a grooved cross-section and a second near cylindrical form. Compared to the ancestral elliptical-shaped hairs, spiny hairs had higher tension and stiffness, and overall, hairs with similar morphology had similar functional properties. To examine the genetic basis of this convergent evolution, we tested whether a single amino acid change (V370A) in the Ectodysplasin A receptor (Edar) gene is associated with spiny hair, as this substitution causes thicker and straighter hair in East Asian human populations. We found that most mammals have the common amino acid valine at position 370, but two species, the kangaroo rat (non-spiny) and spiny pocket mouse (spiny), have an isoleucine. Importantly, none of the variants we identified are associated with differences in rodent hair morphology. Thus, the specific Edar mutation associated with variation in human hair does not seem to play a role in modifying hairs in wild rodents, suggesting that different mutations in Edar and/or other genes are responsible for variation in the spiny hair phenotypes we observed within rodents.
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Affiliation(s)
- Gislene L. Gonçalves
- Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Departamento de Recursos Ambientales, Facultad de Ciencias Agronómicas, Universidad de Tarapacá, Arica, Chile
| | - Renan Maestri
- Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Departamento de Ecologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Gilson R. P. Moreira
- Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Marly A. M. Jacobi
- Departamento de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Thales R. O. Freitas
- Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Hopi E. Hoekstra
- Department of Organismic & Evolutionary Biology, Department of Molecular & Cellular Biology, Museum of Comparative Zoology, Howard Hughes Medical Institute, Harvard University, Cambridge, MA, United States of America
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5
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Peçanha WT, Althoff SL, Galiano D, Quintela FM, Maestri R, Gonçalves GL, Freitas TRO. Pleistocene climatic oscillations in Neotropical open areas: Refuge isolation in the rodent Oxymycterus nasutus endemic to grasslands. PLoS One 2017; 12:e0187329. [PMID: 29176839 PMCID: PMC5703582 DOI: 10.1371/journal.pone.0187329] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 10/17/2017] [Indexed: 11/22/2022] Open
Abstract
Pleistocene climatic oscillations favoured the expansion of grassland ecosystems and open vegetation landscapes throughout the Neotropics, and influenced the evolutionary history of species adapted to such environments. In this study, we sampled populations of the rodent Oxymycterus nasutus endemic to open areas in the Pampas and Atlantic Forest biomes to assess the tempo and mode of population divergence using an integrative approach, including coalescence theory, ecological niche models, and morphometry. Our results indicated that these O. nasutus populations exhibited high levels of genetic structure. Six major mtDNA clades were found, structuring these biomes into distinct groups. Estimates of their divergence times was indicated to be 0.571 myr. The high degree of genetic structure is reflected in the analyses of geometric morphometric; skull differences between lineages in the two ecoregions were detected. During the last glacial maximum, there was a strong increase in suitable abiotic conditions for O. nasutus. Distinct molecular markers revealed a population expansion over time, with a possible demographic retraction during the post-glacial period. Considering that all clades coalesce with the last interglacial maximum, our results indicated that reduction in suitable conditions during this period may have resulted in a possible vicariance associated with refuge isolation.
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Affiliation(s)
- Willian T. Peçanha
- Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil
| | - Sergio L. Althoff
- Departamento de Ciências Naturais, Laboratório de Biologia Animal, Universidade Regional de Blumenau, Blumenau, SC, Brazil
| | - Daniel Galiano
- Pós-graduação em Ciências Ambientais, Area de Ciências Exatas e Ambientais, Unochapecó, Santa Catarina, Brazil
| | - Fernando M. Quintela
- Programa de Pós-Graduação em Biologia de Ambientes Aquáticos Continentais, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande do Sul, Brazil
| | - Renan Maestri
- Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil
| | - Gislene L. Gonçalves
- Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil
- Departamento de Recursos Ambientales, Facultad de Ciencias Agronómicas, Universidad de Tarapacá, Arica, Chile
- * E-mail:
| | - Thales R. O. Freitas
- Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil
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Corso J, Hepp D, Ledur MC, Peixoto JO, Fagundes NJR, Freitas TRO. Genetic variation of the bronze locus (MC1R) in turkeys from Southern Brazil. Genet Mol Biol 2017; 40:104-108. [PMID: 28323301 PMCID: PMC5409775 DOI: 10.1590/1678-4685-gmb-2016-0136] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 11/15/2016] [Indexed: 11/21/2022] Open
Abstract
Domestic turkeys present several color phenotypes controlled by at least five genetic
loci, but only one of these has been identified precisely: the bronze locus, which
turned out to be the melanocortin-1 receptor (MC1R)
gene. MC1R variation is important for breeders interested in
maintaining or developing different color varieties. In this study, we sequenced most
of the MC1R gene from 16 White Holland (the main commercial turkey
variety) and 19 pigmented turkeys from southern Brazil with two purposes. The first
was to describe the MC1R diversity in White Holland turkeys, which
may serve as reservoirs of genetic diversity at this locus. The second was to test
whether the traditional color classification used by Brazilian breeders is related to
previously known MC1R alleles. White Holland turkeys had four
different haplotypes corresponding to the bronze (b+) and black-winged bronze (b1) alleles. Pigmented turkeys also had four haplotypes corresponding to
the b+ and b1 alleles, but different haplotypes represent the most common
b+ allele in these two groups. The black (B) allele was absent
from our samples. Overall, our results suggest that white and pigmented individuals
form two different populations, and that the traditional color classification used by
Brazilian breeders cannot accurately predict the genotypes at the bronze locus.
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Affiliation(s)
- Josmael Corso
- Departmento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Diego Hepp
- Departmento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.,Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS), Porto Alegre, RS, Brazil
| | | | | | - Nelson J R Fagundes
- Departmento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Thales R O Freitas
- Departmento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
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7
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Maestri R, Fornel R, Freitas TRO, Marinho JR. Ontogenetic allometry in the foot size of Oligoryzomys flavescens (Waterhouse, 1837) (Rodentia, Sigmodontinae). BRAZ J BIOL 2015; 75:435-41. [PMID: 26132029 DOI: 10.1590/1519-6984.16613] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 12/04/2013] [Indexed: 11/21/2022] Open
Abstract
Ontogenetic allometry is the study of how the size or shape of certain structures changes over the course of an animal's development. In this study, using Huxley's formula of allometric growth (1932), we assessed the changes in the rate of growth of the feet size of the sigmodontine rodent Oligoryzomys flavescens during its ontogeny and compared differences between males and females. We find evidence of a change of polarity during the ontogenetic development of the species, with the presence of positive allometry during pregnancy and negative allometry in adulthood. Moreover, we note the presence of sexual dimorphism in the size of the feet, in which males of the species have a higher rate of growth than females. This growth pattern is positively related to escape from predators in childhood in both sexes and, in adulthood, provides a higher encounter rate of females by males, due to the larger displacement of the latter. We suggest that both the forces of natural selection and sexual selection have acted to shape the evolution of foot size in this species.
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Affiliation(s)
- R Maestri
- Programa de Pós-Graduação em Ecologia, Universidade Regional Integrada do Alto Uruguai e das Missões, Erechim, RS, Brazil
| | - R Fornel
- Departamento de Ciências Biológicas, Universidade Regional Integrada do Alto Uruguai e das Missões, Erechim, RS, Brazil
| | - T R O Freitas
- Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - J R Marinho
- Departamento de Ciências Biológicas, Universidade Regional Integrada do Alto Uruguai e das Missões, Erechim, RS, Brazil
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8
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Castilho CS, Pedone-Valdez F, Bertuol F, Fruet P, Genoves RC, Di Tullio JC, Caon G, Hoffmann LS, Freitas TRO. Insights about the genetic diversity and population structure of an offshore group of common bottlenose dolphins (Tursiops truncatus) in the Mid-Atlantic. Genet Mol Res 2015; 14:3387-99. [PMID: 25966105 DOI: 10.4238/2015.april.15.2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Although the genus Tursiops has a worldwide distribution and is globally well-studied, some dolphin populations continue to face high risks of decline. Hence, it is necessary to assess the genetic diversity and structure of this genus to properly assess its conservation status and to implement appropriate management actions. In Brazil, genetic studies on this group remain rare, particularly for populations inhabiting offshore waters. Saint Peter and Saint Paul Archipelago (SPSPA) is a small group of islands located in the Mid- Atlantic Ridge, where recent studies of the Tursiops truncatus group indicate that individuals are resident throughout the year around the archipelago, exhibiting considerable site fidelity. A previous study with this group indicated that the individuals form an isolated population. To test this hypothesis, and describe the genetic diversity of SPSPA individuals, we assessed 12 microsatellite loci and a portion of the mitochondrial control region. Bayesian analysis revealed that SPSPA bottlenose dolphins form a unique population. In a phylogeographic perspective, we found that individuals from SPSPA shared mtDNA haplotypes with inshore and offshore individuals from North Atlantic, suggesting that they are not currently isolated from their conspecifics. Mirroring mtDNA findings, microsatellite analysis revealed that most of the pairs of individuals sampled seem to be unrelated (83.8%) and no indication of inbreeding, what would be expected if a small population such as SPSPA was reproductively isolated.
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Affiliation(s)
- C S Castilho
- Laboratório de Ecologia da Paisagem e Conservação, Departamento de Ecologia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - F Pedone-Valdez
- Laboratório de Citogenética e Evolução, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
| | - F Bertuol
- Laboratório de Citogenética e Evolução, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
| | - P Fruet
- Molecular Ecology Laboratory, Flinders University, Adelaide, SA, Australia
| | - R C Genoves
- Laboratório de Mamíferos Marinhos, Museu Oceanográfico, Universidade Federal de Rio Grande, Rio Grande, RS, Brasil
| | - J C Di Tullio
- Laboratório de Mamíferos Marinhos, Museu Oceanográfico, Universidade Federal de Rio Grande, Rio Grande, RS, Brasil
| | - G Caon
- Centro de Estudos em Estresse Oxidativo, Departamento de Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
| | - L S Hoffmann
- Museu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do Sul, Porto Alegre, RS, Brasil
| | - T R O Freitas
- Laboratório de Citogenética e Evolução, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
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9
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Trigo TC, Schneider A, de Oliveira TG, Lehugeur LM, Silveira L, Freitas TRO, Eizirik E. Molecular data reveal complex hybridization and a cryptic species of neotropical wild cat. Curr Biol 2013; 23:2528-33. [PMID: 24291091 DOI: 10.1016/j.cub.2013.10.046] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 09/08/2013] [Accepted: 10/17/2013] [Indexed: 01/07/2023]
Abstract
Hybridization among animal species has recently become more recognized as an important phenomenon, especially in the context of recent radiations. Here we show that complex hybridization has led to contrasting patterns of genomic composition among closely related species of the Neotropical cat genus Leopardus. We show strong evidence of ancient hybridization and introgression between the pampas cat (L. colocolo) and northeastern populations of tigrina (L. tigrinus), leading to remarkable cytonuclear discordance in the latter. In contrast, southern tigrina populations show recent and continuing hybridization with Geoffroy's cat (L. geoffroyi), leading to extreme levels of interspecific admixture at their contact zone. Finally, we demonstrate that two seemingly continuous Brazilian tigrina populations show no evidence of ongoing gene flow between them, leading us to support their formal recognition as distinct species, namely L. tigrinus in the northeast and L. guttulus in the south.
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Affiliation(s)
- Tatiane C Trigo
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS 91501-970, Brazil.
| | - Alexsandra Schneider
- Laboratório de Biologia Genômica e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS 90619-900, Brazil
| | - Tadeu G de Oliveira
- Instituto Pró-Carnívoros, Atibaia, SP 12945-010, Brazil; Departamento de Biologia, Universidade Estadual do Maranhão (UEMA), São Luís, MA 65055-970, Brazil
| | - Livia M Lehugeur
- Laboratório de Biologia Genômica e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS 90619-900, Brazil
| | | | - Thales R O Freitas
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS 91501-970, Brazil
| | - Eduardo Eizirik
- Laboratório de Biologia Genômica e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS 90619-900, Brazil; Instituto Pró-Carnívoros, Atibaia, SP 12945-010, Brazil.
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10
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Rocha-Barbosa O, Bernardo JSL, Loguercio MFC, Freitas TRO, Santos-Mallet JR, Bidau CJ. Penial morphology in three species of Brazilian tuco-tucos, Ctenomys torquatus, C. minutus, and C. flamarioni (Rodentia: Ctenomyidae). BRAZ J BIOL 2013; 73:201-9. [PMID: 23644803 DOI: 10.1590/s1519-69842013000100022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 05/30/2012] [Indexed: 05/27/2023] Open
Abstract
The present study analyses the glans penis and baculum morphology of three Brazilian tuco-tucos, Ctenomys torquatus Lichtenstein, 1830, Ctenomys minutus Nehring, 1887 and Ctenomys flamarioni Travi, 1981, in order to identify possible variations and understand some more about this taxonomically complex group. We used fixed penis from 15 previously listed adult specimens. For a more detailed baculum analysis, the penis underwent dissection and diaphanisation, whereas to analyse the glans penis surface we used Scanning Electron Microscopy (SEM). Results showed striking differences in baculum morphology among the three species. While C. minutus have a particular V-shaped proximal baculum tip, C. flamarioni baculum is thin throughout the shaft with rounded proximal and distal tips. Ctenomys torquatus have a shorter and larger baculum, similar to what has previously been described for the species. Glans penis surface microstructure analyses also revealed inter-specific differences, with penial spines varying in shape, size and, especially density. Although C. torquatus has a relatively small penis, it has the largest penial spine density, which suggests a more complex penial ornamentation in this species.
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Affiliation(s)
- O Rocha-Barbosa
- Laboratório de Zoologia de Vertebrados, Departamento de Zoologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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11
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Abstract
Adaptive variation in the melanocortin 1-receptor gene (MC1R), a key locus in melanogenesis, has been identified in some species of rodents. However, in others, MC1R has no causative role in pigmentation phenotypes despite their coat color variation. In this study, we characterized the rates and patterns of MC1R nucleotide and amino acid sequence evolution and, particularly, selective pressures in the separated domains of the protein using a comparative analysis of 43 species representing three major lineages of rodents with variable coat colors. We found high amino acid variation (44% of sites) throughout the protein. Most substitutions were observed in extracellular and transmembrane domains; the intracellular segment was conserved across species. Pairwise non-synonymous substitutions did not vary significantly in different domains among the rodent lineages - i.e., variation was not associated with phylogenetic distance. Phylogeny-based likelihood analysis suggested that purifying selection has mostly shaped the evolutionary course of MC1R. However, a high proportion of sites (27%) were under relaxation of functional constraints (ω = 0.38), and four sites (3, 14, 26, and 251) clearly evolved under positive selection (ω ≅ 2.9). Thus, our data indicate a high proportion of sites evolving under relaxed evolutionary constraints, which might indicate the evolvability of the system in the generation of adaptive changes in specific taxa in rodent lineages.
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Affiliation(s)
- G L Gonçalves
- Programa de Pós-Graduação em Genética e Biologia Molecular, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
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12
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Hepp D, Gonçalves GL, Moreira GRP, Freitas TRO, Martins CTDC, Weimer TA, Passos DT. Identification of the e allele at the Extension locus (MC1R) in Brazilian Creole sheep and its role in wool color variation. Genet Mol Res 2012; 11:2997-3006. [PMID: 22653672 DOI: 10.4238/2012.may.22.5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The melanocortin 1 receptor (MC1R) gene has been described as responsible for the black color in some breeds of sheep, but little is known about its function in many colored breeds, particularly those with a wide range of pigmentation phenotypes. The Brazilian Creole is a local breed of sheep from southern Brazil that has a wide variety of wool colors. We examined the MC1R gene (Extension locus) to search for the e allele and determine its role in controlling wool color variation in this breed. One hundred and twenty-five animals, covering the most common Creole sheep phenotypes (black, brown, dark gray, light gray, and white), were sequenced to detect the mutations p.M73K and p.D121N. Besides these two mutations, three other synonymous sites (429, 600, and 725) were found. The dominant allele (E(D): p.73K, and p.121N) was found only in colored animals, whereas the recessive allele (E⁺: p.73M, and p.121D) was homozygous only in white individuals. We concluded that MC1R is involved in the control of wool color in Brazilian Creole sheep, particularly the dark phenotypes, although a second gene may be involved in the expression of the white phenotype in this breed.
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Affiliation(s)
- D Hepp
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
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13
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Aurelle D, Baker AJ, Bottin L, Brouat C, Caccone A, Chaix A, Dhakal P, Ding Y, Duplantier JM, Fiedler W, Fietz J, Fong Y, Forcioli D, Freitas TRO, Gunnarsson GH, Haddrath O, Hadziabdic D, Hauksdottir S, Havill NP, Heinrich M, Heinz T, Hjorleifsdottir S, Hong Y, Hreggvidsson GO, Huchette S, Hurst J, Kane M, Kane NC, Kawakami T, Ke W, Keith RA, Klauke N, Klein JL, Kun JFJ, Li C, Li GQ, Li JJ, Loiseau A, Lu LZ, Lucas M, Martins-Ferreira C, Mokhtar-Jamaï K, Olafsson K, Pampoulie C, Pan L, Pooler MR, Ren JD, Rinehart TA, Roussel V, Santos MO, Schaefer HM, Scheffler BE, Schmidt A, Segelbacher G, Shen JD, Skirnisdottir S, Sommer S, Tao ZR, Taubert R, Tian Y, Tomiuk J, Trigiano RN, Ungerer MC, Van Wormhoudt A, Wadl PA, Wang DQ, Weis-Dootz T, Xia Q, Yuan QY. Permanent Genetic Resources added to the Molecular Ecology Resources Database 1 February 2010-31 March 2010. Mol Ecol Resour 2010; 10:751-4. [PMID: 21565086 DOI: 10.1111/j.1755-0998.2010.02871.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This article documents the addition of 228 microsatellite marker loci to the Molecular Ecology Resources Database. Loci were developed for the following species: Anser cygnoides, Apodemus flavicollis, Athene noctua, Cercis canadensis, Glis glis, Gubernatrix cristata, Haliotis tuberculata, Helianthus maximiliani, Laricobius nigrinus, Laricobius rubidus, Neoheligmonella granjoni, Nephrops norvegicus, Oenanthe javanica, Paramuricea clavata, Pyrrhura orcesi and Samanea saman. These loci were cross-tested on the following species: Apodemus sylvaticus, Laricobius laticollis and Laricobius osakensis (a proposed new species currently being described).
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Affiliation(s)
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- Aix-Marseille Université, Centre d'Océanologie de Marseille, CNRS-UMR 6540 DIMAR, rue de la Batterie des Lions, 13007 Marseille, France
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14
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Gonçalves GL, Marinho JR, Freitas TRO. Genetic structure of sigmodontine rodents (Cricetidae) along an altitudinal gradient of the Atlantic Rain Forest in southern Brazil. Genet Mol Biol 2009; 32:882-5. [PMID: 21637469 PMCID: PMC3036879 DOI: 10.1590/s1415-47572009005000081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Accepted: 06/17/2009] [Indexed: 11/24/2022] Open
Abstract
The population genetic structure of two sympatric species of sigmodontine rodents (Oligoryzomys nigripes and Euryoryzomys russatus) was examined for mitochondrial DNA (mtDNA) sequence haplotypes of the control region. Samples were taken from three localities in the Atlantic Rain Forest in southern Brazil, along an altitudinal gradient with different types of habitat. In both species there was no genetic structure throughout their distribution, although levels of genetic variability and gene flow were high.
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Affiliation(s)
- Gislene L Gonçalves
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS Brazil
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15
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Gonçalves GL, Moreira GRP, Freitas TRO, Hepp D, Passos DT, Weimer TA. Mitochondrial and nuclear DNA analyses reveal population differentiation in Brazilian Creole sheep. Anim Genet 2009; 41:308-10. [PMID: 19917048 DOI: 10.1111/j.1365-2052.2009.01986.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using ND5 sequences from mtDNA and 10 nuclear markers, we investigated the genetic differentiation of two South American Creole sheep phenotypes that historically have been bred in different biomes in southern Brazil. In total, 18 unique mtDNA haplotypes were detected, none of which was shared between the two phenotypes. Bayesian analysis also indicated two different groups (k = 2). Thus, these varieties are supported as being genotypically distinct. This situation could have resulted either from geographical isolation, associated with differences in the cultural habits of sheep farmers and in the way that flocks were managed, or more likely, from the introduction of different stocks four centuries ago.
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Affiliation(s)
- G L Gonçalves
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul. Av. Bento Gonçalves, Porto Alegre, RS 91501-970, Brazil.
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16
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Trigo TC, Freitas TRO, Kunzler G, Cardoso L, Silva JCR, Johnson WE, O'Brien SJ, Bonatto SL, Eizirik E. Inter-species hybridization among Neotropical cats of the genus Leopardus, and evidence for an introgressive hybrid zone between L. geoffroyi and L. tigrinus in southern Brazil. Mol Ecol 2009; 17:4317-33. [PMID: 18785898 DOI: 10.1111/j.1365-294x.2008.03919.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Natural hybrid zones between distinct species have been reported for many taxa, but so far, few examples involve carnivores or Neotropical mammals in general. In this study, we employed mitochondrial DNA (mtDNA) sequences and nine microsatellite loci to identify and characterize a hybrid zone between two Neotropical felids, Leopardus geoffroyi and L. tigrinus, both of which are well-established species having diverged from each other c. 1 million years ago. These two felids are mostly allopatric throughout their ranges in South America, with a narrow contact zone that includes southern Brazil. We present strong evidence for the occurrence of hybridization between these species and identify at least 14 individuals (most of them originating from the geographical contact zone) exhibiting signs of interspecific genomic introgression. The genetic structure of Brazilian L. tigrinus populations seems to be affected by this introgression process, showing a gradient of differentiation from L. geoffroyi correlated with distance from the contact zone. We also corroborate and extend previous findings of hybridization between L. tigrinus and a third related felid, L. colocolo, leading to an unusual situation for a mammal, in which the former species contains introgressed mtDNA lineages from two distinct taxa in addition to its own.
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Affiliation(s)
- T C Trigo
- Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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17
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Fernandes FA, Fernández-Stolz GP, Lopes CM, Freitas TRO. The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil. BRAZ J BIOL 2008; 67:839-47. [PMID: 18278350 DOI: 10.1590/s1519-69842007000500006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2007] [Accepted: 10/05/2007] [Indexed: 11/22/2022] Open
Abstract
The goal of conservation biology should be related to the preservation of species and also to the evolutionary and ecological processes that were responsible to form them and that are still acting. We review the conservation status of the species of tuco-tuco (Ctenomys torquatus, C. lami, C. minutus, and C. flamarioni) from southern Brazil, and relate these data to the geological history of a particular area in that region, the Coastal Plain of the States of Rio Grande do Sul and Santa Catarina. The implications of the data on these species from the Southeastern Brazil are also discussed in relation to the evolution and risk of extinction of these subterranean rodents.
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Affiliation(s)
- F A Fernandes
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Abstract
The crab-eating fox is a medium-sized Neotropical canid with generalist habits and a broad distribution in South America. We have investigated its genetic diversity, population structure and demographic history across most of its geographic range by analysing 512 base pairs (bp) of the mitochondrial DNA (mtDNA) control region, 615 bp of the mtDNA cytochrome b gene and 1573 total nucleotides from three different nuclear fragments. MtDNA data revealed a strong phylogeographic partition between northeastern Brazil and other portions of the species' distribution, with complete separation between southern and northern components of the Atlantic Forest. We estimated that the two groups diverged from each other c. 400,000-600,000 years ago, and have had contrasting population histories. A recent demographic expansion was inferred for the southern group, while northern populations seem to have had a longer history of large population size. Nuclear sequence data did not support this north-south pattern of subdivision, likely due at least in part to secondary male-mediated historical gene flow, inferred from multilocus coalescent-based analyses. We have compared the inferred phylogeographic patterns to those observed for other Neotropical vertebrates, and report evidence for a major north-south demographic discontinuity that seems to have marked the history of the Atlantic Forest biota.
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Affiliation(s)
- Ligia Tchaicka
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Campus do Vale - Bloco III, Avenue. Bento Gonçalves 9500 Porto Alegre, RS 91501970. Brazil
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Gonçalves GL, Faria-Correa MA, Cunha AS, Freitas TRO. Bark consumption by the spiny rat Euryzygomatomys spinosus (G. Fischer) (Echimyidae) on a Pinus taeda Linnaeus (Pinaceae) plantation in South Brazil. ACTA ACUST UNITED AC 2007. [DOI: 10.1590/s0101-81752007000100037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Feeding damage caused by Euryzygomatomys spinosus (G. Fischer, 1814) (Echimyidae) is documented for a Pinus taeda Linnaeus (Pinaceae) plantation located in Cambará do Sul, Rio Grande do Sul State, Brazil. Under laboratory conditions, feeding acceptance of P. taeda trunk sections was tested with positive results for E. spinosus, but not for other three co-occurring sigmodontine rodents: Akodon montensis Thomas, 1913, Oligoryzomys nigripes (Olfers, 1818) and Delomys dorsalis (Hensel, 1872).
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Abstract
The present work describes chromosomal polymorphisms in zones of contact between divergent populations of Ctenomys minutus parapatrically distributed in the coastal plain of southern Brazil, and inter-specific hybridization with C. lami a closely related species. A sample of 171 specimens from 32 sample sites distributed along 161 km of the coastal plain was cytogenetically analyzed. Nine polymorphic populations were found: four with specimens with 2n = 46-48 (autosomal arm number (AN) = 76); three only have specimens with 2n = 47 and 48; one population sampled presented specimens with 2n = 43-46 (AN = 74-76) and one population with 2n = 50-52 (AN = 76-80). The remainder populations were fixed for 2n = 42, 46 or 48. The variation is the result of Robertsonian mechanisms of chromosomal evolution and a fusion in tandem rearrangement. The polymorphisms have been considered the result of secondary contact of populations after divergence in allopatry. The geomorphological evolution of the coastal plain provides clues to the possible existence of past geographic barriers acting over populations of Ctenomys, during the Holocene.
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Affiliation(s)
- Adriana Gava
- Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, P.O. Box 15053, 91501-970, Rio Grande do Sul, Brazil.
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