1
|
Guillory WX, de Medeiros Magalhães F, Coelho FEA, Bonatelli IAS, Palma-Silva C, Moraes EM, Garda AA, Burbrink FT, Gehara M. Geoclimatic drivers of diversification in the largest arid and semi-arid environment of the Neotropics: Perspectives from phylogeography. Mol Ecol 2024; 33:e17431. [PMID: 38877815 DOI: 10.1111/mec.17431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/24/2024] [Accepted: 05/30/2024] [Indexed: 06/16/2024]
Abstract
The South American Dry Diagonal, also called the Diagonal of Open Formations, is a large region of seasonally dry vegetation extending from northeastern Brazil to northern Argentina, comprising the Caatinga, Cerrado, and Chaco subregions. A growing body of phylogeography literature has determined that a complex history of climatic changes coupled with more ancient geological events has produced a diverse and endemic-rich Dry Diagonal biota. However, the exact drivers are still under investigation, and their relative strengths and effects are controversial. Pleistocene climatic fluctuations structured lineages via vegetation shifts, refugium formation, and corridors between the Amazon and Atlantic forests. In some taxa, older geological events, such as the reconfiguration of the São Francisco River, uplift of the Central Brazilian Plateau, or the Miocene inundation of the Chaco by marine incursions, were more important. Here, we review the Dry Diagonal phylogeography literature, discussing each hypothesized driver of diversification and assessing degree of support. Few studies statistically test these hypotheses, with most support drawn from associating encountered phylogeographic patterns such as population structure with the timing of ancient geoclimatic events. Across statistical studies, most hypotheses are well supported, with the exception of the Pleistocene Arc Hypothesis. However, taxonomic and regional biases persist, such as a proportional overabundance of herpetofauna studies, and the under-representation of Chaco studies. Overall, both Pleistocene climate change and Neogene geological events shaped the evolution of the Dry Diagonal biota, though the precise effects are regionally and taxonomically varied. We encourage further use of model-based analyses to test evolutionary scenarios, as well as interdisciplinary collaborations to progress the field beyond its current focus on the traditional set of geoclimatic hypotheses.
Collapse
Affiliation(s)
- Wilson X Guillory
- Department of Earth and Environmental Sciences, Rutgers University Newark, Newark, New Jersey, USA
- Department of Biological Sciences, Rutgers University Newark, Newark, New Jersey, USA
| | | | | | - Isabel A S Bonatelli
- Departamento de Ecologia e Biologia Evolutiva, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Diadema, São Paulo, Brazil
| | - Clarisse Palma-Silva
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz, Campinas, São Paulo, Brazil
| | - Evandro M Moraes
- Departamento de Biologia, Universidade Federal de São Carlos (UFSCar), Sorocaba, São Paulo, Brazil
| | - Adrian Antonio Garda
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - Frank T Burbrink
- Department of Herpetology, The American Museum of Natural History, New York City, New York, USA
| | - Marcelo Gehara
- Department of Earth and Environmental Sciences, Rutgers University Newark, Newark, New Jersey, USA
| |
Collapse
|
2
|
Dantas-Queiroz MV, Hurbath F, de Russo Godoy FM, Lanna FM, Versieux LM, Palma-Silva C. Comparative phylogeography reveals the demographic patterns of neotropical ancient mountain species. Mol Ecol 2023. [PMID: 36934376 DOI: 10.1111/mec.16929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 03/20/2023]
Abstract
Mountains are renowned for their bountiful biodiversity. Explanations on the origin of such abundant life are usually regarded to their orogenic history. However, ancient mountain systems with geological stability also exhibit astounding levels of number of species and endemism, as illustrated by the Brazilian Quartzitic Mountains (BQM) in Eastern South America. Thus, cycles of climatic changes over the last couple million years are usually assumed to play an important role in the origin of mountainous biota. These climatic oscillations potentially isolated and reconnected adjacent populations, a phenomenon known as flickering connectivity, accelerating speciation events due to range fragmentation, dispersion, secondary contact, and hybridization. To evaluate the role of the climatic fluctuations on the diversification of the BQM biota, we estimated the ancient demography of distinct endemic species of animals and plants using hierarchical approximate Bayesian computation analysis and Ecological Niche Modelling. Additionally, we evaluated if climatic oscillations have driven a genetic spatial congruence in the genetic structure of codistributed species from the Espinhaço Range, one of the main BQM areas. Our results show that the majority of plant lineages underwent a synchronous expansion over the Last Glacial Maximum (LGM, c. 21 thousand years ago), although we could not obtain a clear demographic pattern for the animal lineages. We also obtained a signal of a congruent phylogeographic break between lineages endemic to the Espinhaço Range, suggesting how ancient climatic oscillations might have driven the evolutionary history of the Espinhaço's biota.
Collapse
Affiliation(s)
- Marcos Vinicius Dantas-Queiroz
- Programa de Pós-Graduação em Biologia Vegetal, Universidade Estadual Paulista (UNESP), São Paulo, Brazil
- Department of Evolutionary Plant Biology, Institute of Botany of the Czech Academy of Sciences, Zámek 1, Průhonice, Czech Republic
| | - Fernanda Hurbath
- Universidade do Estado de Minas Gerais - Unidade Passos, Av. Juca Stockler, 1130, bairro Belo Horizonte, Passos, Brazil
| | - Fernanda Maria de Russo Godoy
- Programa de Pós-Graduação em Biotecnologia e Biodiversidade, Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brazil
| | - Flávia Mol Lanna
- Department of Evolution, Ecology and Organismal Biology. Museum of Biological Diversity, The Ohio State University, Columbus, Ohio, USA
| | - Leonardo M Versieux
- Departamento de Botânica e Zoologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - Clarisse Palma-Silva
- Programa de Pós-Graduação em Biologia Vegetal, Universidade Estadual Paulista (UNESP), São Paulo, Brazil
- Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil
| |
Collapse
|
3
|
Carvalho TR, Seger KR, Magalhães FM, Lourenço LB, Haddad CFB. Systematics and cryptic diversification of
Leptodactylus
frogs in the Brazilian campo rupestre. ZOOL SCR 2020. [DOI: 10.1111/zsc.12470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thiago R. Carvalho
- Laboratório de Herpetologia Departamento de Biodiversidade e Centro de Aquicultura Instituto de Biociências Universidade Estadual Paulista Rio Claro Brazil
| | - Karin R. Seger
- Laboratório de Estudos Cromossômicos Departamento de Biologia Estrutural e Funcional Instituto de Biologia Universidade Estadual de Campinas Campinas Brazil
| | - Felipe M. Magalhães
- Programa de Pós‐Graduação em Ciências Biológicas Centro de Ciências Exatas e da Natureza Universidade Federal da Paraíba João Pessoa Brazil
| | - Luciana B. Lourenço
- Laboratório de Estudos Cromossômicos Departamento de Biologia Estrutural e Funcional Instituto de Biologia Universidade Estadual de Campinas Campinas Brazil
| | - Célio F. B. Haddad
- Laboratório de Herpetologia Departamento de Biodiversidade e Centro de Aquicultura Instituto de Biociências Universidade Estadual Paulista Rio Claro Brazil
| |
Collapse
|
4
|
Rapini A, Bitencourt C, Luebert F, Cardoso D. An escape-to-radiate model for explaining the high plant diversity and endemism in campos rupestres†. Biol J Linn Soc Lond 2020. [DOI: 10.1093/biolinnean/blaa179] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
With extraordinary levels of plant diversity and endemism, the Brazilian campos rupestres across the Espinhaço Range have a species/area ratio 40 times higher than the lowland Amazon. Although diversification drivers in campos rupestres remain a matter of debate, the Pleistocene refugium hypothesis (PRH) is often adopted as the most plausible explanation for their high diversity. The PRH has two main postulates: highland interglacial refugia and a species pump mechanism catalysed by climatic changes. We critically assessed studies on campos rupestres diversification at different evolutionary levels and conclude that most of them are affected by sampling biases, unrealistic assumptions or inaccurate results that do not support the PRH. By modelling the palaeo-range of campos rupestres based on the distribution of 1123 species of vascular plants endemic to the Espinhaço Range and using climate and edaphic variables, we projected a virtually constant suitable area for campos rupestres across the last glacial cycle. We challenge the great importance placed on Pleistocene climatic oscillations in campos rupestres plant diversification and offer an alternative explanation named escape-to-radiate model, which emphasizes niche shifts. Under this biogeographic model of diversification, the long-term fragmentation of campos rupestres combined with recurrent extinctions after genetic drift and sporadic events of adaptive radiation may provide an explanation for the current diversity and endemism in the Espinhaço Range. We conclude that long-term diversification dynamics in campos rupestres are mainly driven by selection, while most endemic diversity is ephemeral, extremely fragile and mainly driven by drift.
Collapse
Affiliation(s)
- Alessandro Rapini
- Programa de Pós-graduação em Botânica, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s.n., Novo Horizonte, Feira de Santana, Bahia, Brazil
| | - Cássia Bitencourt
- Programa de Pós-graduação em Botânica, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s.n., Novo Horizonte, Feira de Santana, Bahia, Brazil
| | - Federico Luebert
- Departmento de Silvicultura y Conservación de la Naturaleza, Universidad de Chile, Santa Rosa 11315, La Pintana, Santiago, Chile
| | - Domingos Cardoso
- Programa de Pós-graduação em Botânica, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s.n., Novo Horizonte, Feira de Santana, Bahia, Brazil
- National Institute of Science and Technology in Interdisciplinary and Transdisciplinary Studies in Ecology and Evolution (INCT IN-TREE), Instituto de Biologia, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s.n., Ondina, Salvador, Bahia, Brazil
| |
Collapse
|
5
|
Weak population structure and no genetic erosion in Pilosocereus aureispinus: A microendemic and threatened cactus species from eastern Brazil. PLoS One 2018; 13:e0195475. [PMID: 29630653 PMCID: PMC5890996 DOI: 10.1371/journal.pone.0195475] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 03/24/2018] [Indexed: 01/23/2023] Open
Abstract
Succulent cacti (Cactaceae) are among the most threatened taxonomic groups assessed to date. Here we evaluated the genetic diversity and population structure of a narrow endemic columnar cactus Pilosocereus aureispinus. This species is only found in a small area of c. 300 km2 of rocky savanna from eastern Brazil and it is currently classified as vulnerable (VU) on the International Union for Conservation of Nature (IUCN) red list. Eight microsatellite loci were genotyped for 91 individuals from four localities of the known P. aureispinus range. In contrast with expectations for narrow endemic species, we found relatively high levels of genetic diversity (e.g., HE = 0.390 to 0.525; HO = 0.394 to 0.572) and very low population structure based on the variation of six loci. All the analyzed individuals were clustered in one unique genetic group in assignment tests. We also generated the sequences of two plastid markers (trnT-trnL and psbD-trnT) and found no variation on a subsample of 39 individuals. We used Landsat 8 images and Normalized Difference Vegetation Index to estimate a potential extent of occurrence of c. 750 km2 for this species. Our results showed that P. aureispinus is not suffering from erosion of nuclear genetic variability due to its narrow distribution. However, we advocate that because of the extremely limited extent of occurrence, the ongoing anthropogenic disturbances in its habitat, and phylogenetic distinctiveness of P. aureispinus, this species should be classified as endangered (EN) on the IUCN Red List.
Collapse
|
6
|
Cornejo-Romero A, Vargas-Mendoza CF, Aguilar-Martínez GF, Medina-Sánchez J, Rendón-Aguilar B, Valverde PL, Zavala-Hurtado JA, Serrato A, Rivas-Arancibia S, Pérez-Hernández MA, López-Ortega G, Jiménez-Sierra C. Alternative glacial-interglacial refugia demographic hypotheses tested on Cephalocereus columna-trajani (Cactaceae) in the intertropical Mexican drylands. PLoS One 2017; 12:e0175905. [PMID: 28426818 PMCID: PMC5398652 DOI: 10.1371/journal.pone.0175905] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 04/02/2017] [Indexed: 12/27/2022] Open
Abstract
Historic demography changes of plant species adapted to New World arid environments could be consistent with either the Glacial Refugium Hypothesis (GRH), which posits that populations contracted to refuges during the cold-dry glacial and expanded in warm-humid interglacial periods, or with the Interglacial Refugium Hypothesis (IRH), which suggests that populations contracted during interglacials and expanded in glacial times. These contrasting hypotheses are developed in the present study for the giant columnar cactus Cephalocereus columna-trajani in the intertropical Mexican drylands where the effects of Late Quaternary climatic changes on phylogeography of cacti remain largely unknown. In order to determine if the historic demography and phylogeographic structure of the species are consistent with either hypothesis, sequences of the chloroplast regions psbA-trnH and trnT-trnL from 110 individuals from 10 populations comprising the full distribution range of this species were analysed. Standard estimators of genetic diversity and structure were calculated. The historic demography was analysed using a Bayesian approach and the palaeodistribution was derived from ecological niche modelling to determine if, in the arid environments of south-central Mexico, glacial-interglacial cycles drove the genetic divergence and diversification of this species. Results reveal low but statistically significant population differentiation (FST = 0.124, P < 0.001), although very clear geographic clusters are not formed. Genetic diversity, haplotype network and Approximate Bayesian Computation (ABC) demographic analyses suggest a population expansion estimated to have taken place in the Last Interglacial (123.04 kya, 95% CI 115.3–130.03). The species palaeodistribution is consistent with the ABC analyses and indicates that the potential area of palaedistribution and climatic suitability were larger during the Last Interglacial and Holocene than in the Last Glacial Maximum. Overall, these results suggest that C. columna-trajani experienced an expansion following the warm conditions of interglacials, in accordance with the GRH.
Collapse
Affiliation(s)
- Amelia Cornejo-Romero
- Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, CD México, México
| | - Carlos Fabián Vargas-Mendoza
- Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, CD México, México
- * E-mail:
| | - Gustavo F. Aguilar-Martínez
- Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, CD México, México
| | | | - Beatriz Rendón-Aguilar
- Departamento de Biología, Universidad Autónoma Metropolitana-Iztapalapa, CD México, México
| | - Pedro Luis Valverde
- Departamento de Biología, Universidad Autónoma Metropolitana-Iztapalapa, CD México, México
| | | | - Alejandra Serrato
- Departamento de Hidrobiología, Universidad Autónoma Metropolitana-Iztapalapa, CD México, México
| | | | | | - Gerardo López-Ortega
- Departamento de Biología, Universidad Autónoma Metropolitana-Iztapalapa, CD México, México
| | - Cecilia Jiménez-Sierra
- Departamento de Biología, Universidad Autónoma Metropolitana-Iztapalapa, CD México, México
| |
Collapse
|
7
|
Lima JS, Telles MPC, Chaves LJ, Lima-Ribeiro MS, Collevatti RG. Demographic stability and high historical connectivity explain the diversity of a savanna tree species in the Quaternary. ANNALS OF BOTANY 2017; 119:645-657. [PMID: 28115317 PMCID: PMC5458718 DOI: 10.1093/aob/mcw257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 10/03/2016] [Accepted: 11/03/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND AND AIMS Cyclic glaciations were frequent throughout the Quaternary and this affected species distribution and population differentiation worldwide. The present study reconstructed the demographic history and dispersal routes of Eugenia dysenterica lineages and investigated the effects of Quaternary climate change on its spatial pattern of genetic diversity. METHODS A total of 333 individuals were sampled from 23 populations and analysed by sequencing four regions of the chloroplast DNA and the internal transcribed spacer of the nuclear DNA. The analyses were performed using a multi-model inference approach based on ecological niche modelling and statistical phylogeography. KEY RESULTS Coalescent simulation showed that population stability through time is the most likely scenario. The palaeodistribution dynamics predicted by the ecological niche models revealed that the species was potentially distributed across a large area, extending over Central-Western Brazil through the last glaciation. The lineages of E. dysenterica dispersed from Central Brazil towards populations at the northern, western and south-eastern regions. A historical refugium through time may have favoured lineage dispersal and the maintenance of genetic diversity. CONCLUSIONS The results suggest that the central region of the Cerrado biome is probably the centre of distribution of E. dysenterica and that the spatial pattern of its genetic diversity may be the outcome of population stability throughout the Quaternary. The lower genetic diversity in populations in the south-eastern Cerrado biome is probably due to local climatic instability during the Quaternary.
Collapse
Affiliation(s)
- Jacqueline S. Lima
- Laboratório de Genética & Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal de Goiás, PO Box 131, 74001-970, Goiânia, Brazil
| | - Mariana P. C. Telles
- Laboratório de Genética & Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal de Goiás, PO Box 131, 74001-970, Goiânia, Brazil
- Escola de Ciências Agrárias e Biológicas, Pontifícia Universidade Católica de Goiás, 74605-010, Goiânia, Brazil
| | - Lázaro J. Chaves
- Escola de Agronomia, Universidade Federal de Goiás, PO Box 131, 74001-970, Goiânia, Brazil
| | - Matheus S. Lima-Ribeiro
- Laboratório de Macroecologia, Universidade Federal de Goiás, PO Box 03, 75804-020, Jataí, Brazil
| | - Rosane G. Collevatti
- Laboratório de Genética & Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal de Goiás, PO Box 131, 74001-970, Goiânia, Brazil
| |
Collapse
|
8
|
Perez MF, Bonatelli IAS, Moraes EM, Carstens BC. Model-based analysis supports interglacial refugia over long-dispersal events in the diversification of two South American cactus species. Heredity (Edinb) 2016; 116:550-7. [PMID: 27071846 DOI: 10.1038/hdy.2016.17] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Revised: 01/26/2016] [Accepted: 02/02/2016] [Indexed: 02/06/2023] Open
Abstract
Pilosocereus machrisii and P. aurisetus are cactus species within the P. aurisetus complex, a group of eight cacti that are restricted to rocky habitats within the Neotropical savannas of eastern South America. Previous studies have suggested that diversification within this complex was driven by distributional fragmentation, isolation leading to allopatric differentiation, and secondary contact among divergent lineages. These events have been associated with Quaternary climatic cycles, leading to the hypothesis that the xerophytic vegetation patches which presently harbor these populations operate as refugia during the current interglacial. However, owing to limitations of the standard phylogeographic approaches used in these studies, this hypothesis was not explicitly tested. Here we use Approximate Bayesian Computation to refine the previous inferences and test the role of different events in the diversification of two species within P. aurisetus group. We used molecular data from chloroplast DNA and simple sequence repeats loci of P. machrisii and P. aurisetus, the two species with broadest distribution in the complex, in order to test if the diversification in each species was driven mostly by vicariance or by long-dispersal events. We found that both species were affected primarily by vicariance, with a refuge model as the most likely scenario for P. aurisetus and a soft vicariance scenario most probable for P. machrisii. These results emphasize the importance of distributional fragmentation in these species, and add support to the hypothesis of long-term isolation in interglacial refugia previously proposed for the P. aurisetus species complex diversification.
Collapse
Affiliation(s)
- M F Perez
- Departamento de Biologia, Universidade Federal de São Carlos, Sorocaba, São Paulo, Brazil
| | - I A S Bonatelli
- Departamento de Biologia, Universidade Federal de São Carlos, Sorocaba, São Paulo, Brazil
| | - E M Moraes
- Departamento de Biologia, Universidade Federal de São Carlos, Sorocaba, São Paulo, Brazil
| | - B C Carstens
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH, USA
| |
Collapse
|
9
|
Bonatelli IAS, Perez MF, Peterson AT, Taylor NP, Zappi DC, Machado MC, Koch I, Pires AHC, Moraes EM. Interglacial microrefugia and diversification of a cactus species complex: phylogeography and palaeodistributional reconstructions forPilosocereus aurisetusand allies. Mol Ecol 2014; 23:3044-63. [DOI: 10.1111/mec.12780] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Revised: 04/21/2014] [Accepted: 04/23/2014] [Indexed: 02/04/2023]
Affiliation(s)
- Isabel A. S. Bonatelli
- Departamento de Biologia; Universidade Federal de São Carlos; Rodovia João Leme dos Santos km 110 18052780 Sorocaba São Paulo Brazil
| | - Manolo F. Perez
- Departamento de Biologia; Universidade Federal de São Carlos; Rodovia João Leme dos Santos km 110 18052780 Sorocaba São Paulo Brazil
| | | | - Nigel P. Taylor
- National Parks Board; Singapore Botanic Gardens; 1 Cluny Road Singapore 259569 Singapore
- Royal Botanic Gardens; Kew Richmond Surrey TW9 3AB UK
| | - Daniela C. Zappi
- Royal Botanic Gardens; Kew Richmond Surrey TW9 3AB UK
- Gardens by the Bay; 18 Marina Gardens Drive Singapore Singapore
| | - Marlon C. Machado
- Departamento de Ciências Biológicas; Universidade Estadual de Feira de Santana; Rodovia BR 116 km 03 44031-460 Feira de Santana Bahia Brazil
| | - Ingrid Koch
- Departamento de Biologia; Universidade Federal de São Carlos; Rodovia João Leme dos Santos km 110 18052780 Sorocaba São Paulo Brazil
| | - Adriana H. C. Pires
- Departamento de Biologia; Universidade Federal de São Carlos; Rodovia João Leme dos Santos km 110 18052780 Sorocaba São Paulo Brazil
| | - Evandro M. Moraes
- Departamento de Biologia; Universidade Federal de São Carlos; Rodovia João Leme dos Santos km 110 18052780 Sorocaba São Paulo Brazil
| |
Collapse
|
10
|
Demographic history and the low genetic diversity in Dipteryx alata (Fabaceae) from Brazilian Neotropical savannas. Heredity (Edinb) 2013; 111:97-105. [PMID: 23591520 DOI: 10.1038/hdy.2013.23] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Revised: 03/08/2013] [Accepted: 03/11/2013] [Indexed: 11/08/2022] Open
Abstract
Genetic effects of habitat fragmentation may be undetectable because they are generally a recent event in evolutionary time or because of confounding effects such as historical bottlenecks and historical changes in species' distribution. To assess the effects of demographic history on the genetic diversity and population structure in the Neotropical tree Dipteryx alata (Fabaceae), we used coalescence analyses coupled with ecological niche modeling to hindcast its distribution over the last 21 000 years. Twenty-five populations (644 individuals) were sampled and all individuals were genotyped using eight microsatellite loci. All populations presented low allelic richness and genetic diversity. The estimated effective population size was small in all populations and gene flow was negligible among most. We also found a significant signal of demographic reduction in most cases. Genetic differentiation among populations was significantly correlated with geographical distance. Allelic richness showed a spatial cline pattern in relation to the species' paleodistribution 21 kyr BP (thousand years before present), as expected under a range expansion model. Our results show strong evidences that genetic diversity in D. alata is the outcome of the historical changes in species distribution during the late Pleistocene. Because of this historically low effective population size and the low genetic diversity, recent fragmentation of the Cerrado biome may increase population differentiation, causing population decline and compromising long-term persistence.
Collapse
|
11
|
Collevatti RG, Terribile LC, Lima-Ribeiro MS, Nabout JC, de Oliveira G, Rangel TF, Rabelo SG, Diniz-Filho JAF. A coupled phylogeographical and species distribution modelling approach recovers the demographical history of a Neotropical seasonally dry forest tree species. Mol Ecol 2012; 21:5845-63. [PMID: 23094833 DOI: 10.1111/mec.12071] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 08/23/2012] [Accepted: 08/28/2012] [Indexed: 11/29/2022]
Abstract
We investigated here the demographical history of Tabebuia impetiginosa (Bignoniaceae) to understand the dynamics of the disjunct geographical distribution of South American seasonally dry forests (SDFs), based on coupling an ensemble approach encompassing hindcasting species distribution modelling and statistical phylogeographical analysis. We sampled 17 populations (280 individuals) in central Brazil and analysed the polymorphisms at chloroplast (trnS-trnG, psbA-trnH, and ycf6-trnC intergenic spacers) and nuclear (ITS nrDNA) genomes. Phylogenetic analyses based on median-joining network showed no haplotype sharing among population but strong evidence of incomplete lineage sorting. Coalescent analyses showed historical constant populations size, negligible gene flow among populations, and an ancient time to most recent common ancestor dated from ~4.7 ± 1.1 Myr BP. Most divergences dated from the Lower Pleistocene, and no signal of important population size reduction was found in coalescent tree and tests of demographical expansion. Demographical scenarios were built based on past geographical range dynamic models, using two a priori biogeographical hypotheses ('Pleistocene Arc' and 'Amazonian SDF expansion') and on two additional hypotheses suggested by the palaeodistribution modelling built with several algorithms for distribution modelling and palaeoclimatic data. The simulation of these demographical scenarios showed that the pattern of diversity found so far for T. impetiginosa is in consonance with a palaeodistribution expansion during the last glacial maximum (LGM, 21 kyr BP), strongly suggesting that the current disjunct distribution of T. impetiginosa in SDFs may represent a climatic relict of a once more wide distribution.
Collapse
Affiliation(s)
- Rosane G Collevatti
- Laboratório de Genética & Biodiversidade, ICB, Universidade Federal de Goiás, Cx.P. 131, 74001-970 Goiânia, GO, Brasil.
| | | | | | | | | | | | | | | |
Collapse
|