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Global incursion pathways of Thaumastocoris peregrinus, an invasive Australian pest of eucalypts. Biol Invasions 2020. [DOI: 10.1007/s10530-020-02337-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Foucaud J, Moreno C, Pascual M, Rezende EL, Castañeda LE, Gibert P, Mery F. Introduced Drosophila subobscura populations perform better than native populations during an oviposition choice task due to increased fecundity but similar learning ability. Ecol Evol 2016; 6:1725-36. [PMID: 26925216 PMCID: PMC4755011 DOI: 10.1002/ece3.2015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 01/25/2016] [Accepted: 01/27/2016] [Indexed: 12/13/2022] Open
Abstract
The success of invasive species is tightly linked to their fitness in a putatively novel environment. While quantitative components of fitness have been studied extensively in the context of invasive species, fewer studies have looked at qualitative components of fitness, such as behavioral plasticity, and their interaction with quantitative components, despite intuitive benefits over the course of an invasion. In particular, learning is a form of behavioral plasticity that makes it possible to finely tune behavior according to environmental conditions. Learning can be crucial for survival and reproduction of introduced organisms in novel areas, for example, for detecting new predators, or finding mates or oviposition sites. Here we explored how oviposition performance evolved in relation to both fecundity and learning during an invasion, using native and introduced Drosophila subobscura populations performing an ecologically relevant task. Our results indicated that, under comparable conditions, invasive populations performed better during our oviposition task than did native populations. This was because invasive populations had higher fecundity, together with similar cognitive performance when compared to native populations, and that there was no interaction between learning and fecundity. Unexpectedly, our study did not reveal an allocation trade‐off (i.e., a negative relationship) between learning and fecundity. On the contrary, the pattern we observed was more consistent with an acquisition trade‐off, meaning that fecundity could be limited by availability of resources, unlike cognitive ability. This pattern might be the consequence of escaping natural enemies and/or competitors during the introduction. The apparent lack of evolution of learning may indicate that the introduced population did not face novel cognitive challenges in the new environment (i.e., cognitive “pre‐adaptation”). Alternatively, the evolution of learning may have been transient and therefore not detected.
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Affiliation(s)
- Julien Foucaud
- Laboratoire Evolution, Génomes, Comportement et Ecologie UMR-CNRS 9191 Gif/Yvette France
| | - Céline Moreno
- Laboratoire Evolution, Génomes, Comportement et Ecologie UMR-CNRS 9191 Gif/Yvette France
| | - Marta Pascual
- Department of Genetics and IrBio Universitat de Barcelona Av. Diagonal 643 08028 Barcelona Spain
| | - Enrico L Rezende
- Department of Life Sciences University of Roehampton Holybourne Avenue London SW15 4JD UK
| | - Luis E Castañeda
- Instituto de Ciencias Ambientales y Evolutivas Universidad Austral de Chile PO 5090000 Valdivia Chile
| | - Patricia Gibert
- Université de Lyon Université Lyon1 Laboratoire de Biométrie et Biologie Evolutive UMR CNRS 5558 43 Bd du 11 Novembre 1918 69622 Villeurbanne Cedex France
| | - Frederic Mery
- Laboratoire Evolution, Génomes, Comportement et Ecologie UMR-CNRS 9191 Gif/Yvette France
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Hangartner SB, Hoffmann AA, Smith A, Griffin PC. A collection of Australian Drosophila datasets on climate adaptation and species distributions. Sci Data 2015; 2:150067. [PMID: 26601886 PMCID: PMC4658573 DOI: 10.1038/sdata.2015.67] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/16/2015] [Indexed: 02/07/2023] Open
Abstract
The Australian Drosophila Ecology and Evolution Resource (ADEER) collates Australian datasets on drosophilid flies, which are aimed at investigating questions around climate adaptation, species distribution limits and population genetics. Australian drosophilid species are diverse in climatic tolerance, geographic distribution and behaviour. Many species are restricted to the tropics, a few are temperate specialists, and some have broad distributions across climatic regions. Whereas some species show adaptability to climate changes through genetic and plastic changes, other species have limited adaptive capacity. This knowledge has been used to identify traits and genetic polymorphisms involved in climate change adaptation and build predictive models of responses to climate change. ADEER brings together 103 datasets from 39 studies published between 1982-2013 in a single online resource. All datasets can be downloaded freely in full, along with maps and other visualisations. These historical datasets are preserved for future studies, which will be especially useful for assessing climate-related changes over time.
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Affiliation(s)
- Sandra B. Hangartner
- School of BioSciences, The University of Melbourne, Parkville, Victoria 3010, Australia
- School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia
| | - Ary A. Hoffmann
- School of BioSciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Ailie Smith
- eScholarship Research Centre, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Philippa C. Griffin
- School of BioSciences, The University of Melbourne, Parkville, Victoria 3010, Australia
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Bahder BW, Bahder LD, Hamby KA, Walsh DB, Zalom FG. Microsatellite Variation of two Pacific Coast Drosophila suzukii (Diptera: Drosophilidae) Populations. ENVIRONMENTAL ENTOMOLOGY 2015; 44:1449-1453. [PMID: 26314019 DOI: 10.1093/ee/nvv117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 06/24/2015] [Indexed: 06/04/2023]
Abstract
The vinegar fly, Drosophila suzukii (Diptera: Drosophilidae), is a recent invader in North America that has become a serious threat to small fruit production. It was first detected in California in 2008 and in Washington state in 2009. In this study, D. suzukii populations from the area of the original detection on California's central coast and from eastern Washington, the United States, were sampled over a 3-year period to determine genetic variation in both using microsatellite markers. Six different loci were successfully amplified and included in the analysis. These loci included nanos, elf1, antennapedia, mastermind, z600, and tenA. The population from eastern Washington was highly monomorphic with one locus, mastermind, having multiple alleles. There was greater genetic variation in the coastal California population with all loci having multiple alleles, with the exception of tenA. Owing to the relatively low levels of genetic variation in the eastern Washington population compared with the coastal California population, it appears that the D. suzukii population in the eastern Washington region has undergone a significant bottleneck.
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Affiliation(s)
- Brian W Bahder
- Washington State University, 24106 N Bunn Rd. Prosser, WA 99350.
| | - Luz D Bahder
- Washington State University, 24106 N Bunn Rd. Prosser, WA 99350
| | - Kelly A Hamby
- University of California, 374 Briggs Hall, One Shields Ave., Davis, CA 95616
| | - Douglas B Walsh
- Washington State University, 24106 N Bunn Rd. Prosser, WA 99350
| | - Frank G Zalom
- University of California, 374 Briggs Hall, One Shields Ave., Davis, CA 95616
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Temporal Genetic Dynamics of an Invasive Species, Frankliniella occidentalis (Pergande), in an Early Phase of Establishment. Sci Rep 2015; 5:11877. [PMID: 26138760 PMCID: PMC4490395 DOI: 10.1038/srep11877] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 06/10/2015] [Indexed: 01/21/2023] Open
Abstract
Many species can successfully colonize new areas despite their propagules having low genetic variation. We assessed whether the decreased genetic diversity could result in temporal fluctuations of genetic parameters of the new populations of an invasive species, western flower thrips, Frankliniella occidentalis, using mitochondrial and microsatellite markers. This study was conducted in eight localities from four climate regions in China, where F. occidentalis was introduced in the year 2000 and had lower genetic diversity than its native populations. We also tested the level of genetic differentiation in these introduced populations. The genetic diversity of the samples at different years in the same locality was not significantly different from each other in most localities. FST and STRUCTURE analysis also showed that most temporal population comparisons from the same sites were not significantly differentiated. Our results showed that the invasive populations of F. occidentalis in China can maintain temporal stability in genetic composition at an early phase of establishment despite having lower genetic diversity than in their native range.
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Cavasini R, Batista MRD, Klaczko LB. Chromosomal localization of microsatellite loci in Drosophila mediopunctata. Genet Mol Biol 2015; 38:55-8. [PMID: 25983625 PMCID: PMC4415555 DOI: 10.1590/s1415-475738138120140275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 11/23/2014] [Indexed: 11/21/2022] Open
Abstract
Drosophila mediopunctata has been used as a model organism for
genetics and evolutionary studies in the last three decades. A linkage map with 48
microsatellite loci recently published for this species showed five syntenic groups,
which had their homology determined to Drosophila melanogaster
chromosomes. Then, by inference, each of the groups was associated with one of the
five major chromosomes of D. mediopunctata. Our objective was to
carry out a genetic (chromosomal) analysis to increase the number of available loci
with known chromosomal location. We made a simultaneous analysis of visible mutant
phenotypes and microsatellite genotypes in a backcross of a standard strain and a
mutant strain, which had each major autosome marked. Hence, we could establish the
chromosomal location of seventeen loci; including one from each of the five major
linkage groups previously published, and twelve new loci. Our results were congruent
with the previous location and they open new possibilities to future work integrating
microsatellites, chromosomal inversions, and genetic determinants of physiological
and morphological variation.
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Affiliation(s)
- Renato Cavasini
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Marcos Roberto Dias Batista
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Louis Bernard Klaczko
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brazil
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A preliminary study for identification of candidate AFLP markers under artificial selection for shell color in pearl oyster Pinctada fucata. Gene 2014; 542:8-15. [DOI: 10.1016/j.gene.2014.03.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 12/20/2013] [Accepted: 03/11/2014] [Indexed: 11/20/2022]
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8
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Matute DR. The role of founder effects on the evolution of reproductive isolation. J Evol Biol 2013; 26:2299-311. [DOI: 10.1111/jeb.12246] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 07/03/2013] [Accepted: 08/09/2013] [Indexed: 11/29/2022]
Affiliation(s)
- D. R. Matute
- Department of Human Genetics; The University of Chicago; Chicago IL USA
- The Chicago Fellows Program; The University of Chicago; Chicago IL USA
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Barker JSF. Genetic history of a colonizing population:Drosophila buzzatii(Diptera: Drosophilidae) in Australia. Biol J Linn Soc Lond 2013. [DOI: 10.1111/bij.12067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- J. Stuart F. Barker
- School of Environmental and Rural Science; University of New England; Armidale; NSW; 2351; Australia
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Coscia I, Vogiatzi E, Kotoulas G, Tsigenopoulos CS, Mariani S. Exploring neutral and adaptive processes in expanding populations of gilthead sea bream, Sparus aurata L., in the North-East Atlantic. Heredity (Edinb) 2012; 108:537-46. [PMID: 22126850 PMCID: PMC3331784 DOI: 10.1038/hdy.2011.120] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 10/17/2011] [Accepted: 10/27/2011] [Indexed: 11/08/2022] Open
Abstract
Recent studies in empirical population genetics have highlighted the importance of taking into account both neutral and adaptive genetic variation in characterizing microevolutionary dynamics. Here, we explore the genetic population structure and the footprints of selection in four populations of the warm-temperate coastal fish, the gilthead sea bream (Sparus aurata), whose recent northward expansion has been linked to climate change. Samples were collected at four Atlantic locations, including Spain, Portugal, France and the South of Ireland, and genetically assayed using a suite of species-specific markers, including 15 putatively neutral microsatellites and 23 expressed sequence tag-linked markers, as well as a portion of the mitochondrial DNA (mtDNA) control region. Two of the putatively neutral markers, Bld-10 and Ad-10, bore signatures of strong directional selection, particularly in the newly established Irish population, although the potential 'surfing effect' of rare alleles at the edge of the expansion front was also considered. Analyses after the removal of these loci suggest low but significant population structure likely affected by some degree of gene flow counteracting random genetic drift. No signal of historic divergence was detected at mtDNA. BLAST searches conducted with all 38 markers used failed to identify specific genomic regions associated to adaptive functions. However, the availability of genomic resources for this commercially valuable species is rapidly increasing, bringing us closer to the understanding of the interplay between selective and neutral evolutionary forces, shaping population divergence of an expanding species in a heterogeneous milieu.
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Affiliation(s)
- I Coscia
- School of Biology and Environmental Science, Science Centre West, University College Dublin, Dublin, Ireland
| | - E Vogiatzi
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology and Genetics (IMBG), Crete, Greece
- Department of Molecular Biology and Genetics, Democritian University of Thrace, Alexandroupolis, Greece
| | - G Kotoulas
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology and Genetics (IMBG), Crete, Greece
| | - C S Tsigenopoulos
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology and Genetics (IMBG), Crete, Greece
| | - S Mariani
- School of Biology and Environmental Science, Science Centre West, University College Dublin, Dublin, Ireland
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11
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Yang X, Qian L, Wu H, Fan Z, Wang C. Population differentiation, bottleneck and selection of Eurasian perch (Perca fluviatilis L.) at the Asian edge of its natural range. BIOCHEM SYST ECOL 2012. [DOI: 10.1016/j.bse.2011.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Xu L, Wang C, Wang J, Dong Z, Ma Y, Yang X. Selection pressures have driven population differentiation of domesticated and wild common carp (Cyprinus carpio L.). GENETICS AND MOLECULAR RESEARCH 2012; 11:3222-35. [DOI: 10.4238/2012.september.12.5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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13
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Barker JSF. Effective population size of natural populations of Drosophila buzzatii, with a comparative evaluation of nine methods of estimation. Mol Ecol 2011; 20:4452-71. [PMID: 21951766 DOI: 10.1111/j.1365-294x.2011.05324.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allozyme and microsatellite data from numerous populations of Drosophila buzzatii have been used (i) to determine to what degree N(e) varies among generations within populations, and among populations, and (ii) to evaluate the congruence of four temporal and five single-sample estimators of N(e) . Effective size of different populations varied over two orders of magnitude, most populations are not temporally stable in genetic composition, and N(e) showed large variation over generations in some populations. Short-term N(e) estimates from the temporal methods were highly correlated, but the smallest estimates were the most precise for all four methods, and the most consistent across methods. Except for one population, N(e) estimates were lower when assuming gene flow than when assuming populations that were closed. However, attempts to jointly estimate N(e) and immigration rate were of little value because the source of migrants was unknown. Correlations among the estimates from the single-sample methods generally were not significant although, as for the temporal methods, estimates were most consistent when they were small. These single-sample estimates of current N(e) are generally smaller than the short-term temporal estimates. Nevertheless, population genetic variation is not being depleted, presumably because of past or ongoing migration. A clearer picture of current and short-term effective population sizes will only follow with better knowledge of migration rates between populations. Different methods are not necessarily estimating the same N(e) , they are subject to different bias, and the biology, demography and history of the population(s) may affect different estimators differently.
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Affiliation(s)
- J S F Barker
- School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
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15
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Nanda P, Singh BN. Origin of sexual isolation in Drosophila ananassae due to founder effects. Genetica 2011; 139:779-87. [PMID: 21626152 DOI: 10.1007/s10709-011-9582-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Accepted: 05/16/2011] [Indexed: 11/26/2022]
Abstract
The origin of sexual isolation is the central event in the evolution of biological species and plays a key role in maintaining biological diversity. Three mass culture stocks of D. ananassae originating from different geographic localities showing no isolation with each other were subjected to different degrees of bottlenecks i.e. one pair, five pairs and ten pairs. These drift lines were passed through flush-crash cycle at every generation with same initial number of founders, and maintained for twenty-seven generations and then the pattern of matings was tested among these nine drift lines involving 36 crosses in total. In 23 of 36 crosses, the difference between homogamic and heterogamic matings was significant and isolation indices were significantly more than zero in one direction only providing evidence for asymmetrical sexual isolation. Further, when Bonferroni test for pair-wise analysis was employed, significant differences between homogamic and heterogamic matings were found in 25 crosses. These findings provide evidence for origin of sexual isolation by founder effects in D. ananassae.
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Affiliation(s)
- Punita Nanda
- Genetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
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Naim DM, Telfer S, Tatman S, Bird S, Kemp SJ, Hughes R, Watts PC. Patterns of genetic divergence among populations of the common dormouse, Muscardinus avellanarius in the UK. Mol Biol Rep 2011; 39:1205-15. [PMID: 21603855 DOI: 10.1007/s11033-011-0850-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Accepted: 05/12/2011] [Indexed: 11/29/2022]
Abstract
Quantitative descriptions of population genetic structure allows the delineation of population units and is therefore of primary importance in population management and wildlife conservation. Yet, predicting factors that influence the gene flow patterns in populations particularly at landscape scales remains a major challenge in evolutionary biology. Here we report a population genetic study of the common dormouse, Muscardinus avellanarius, a species that is seriously threatened due to anthropogenic factors, in two regions, Bontuchel (Denbighshire) and Afonwen (Gwynedd), both in Wales, UK. Ten microsatellite loci were used to characterize patterns of genetic diversity of M. avellanarius within both regions. While the population differentiation between both regions is apparent through geographical scale separating them, by using Bayesian clustering analyses, we identified the occurrence of genetic division among populations of M. avellanarius in Bontuchel region, but no significant evidence of differentiation in Afonwen. We found a strong significant isolation-by-distance (IBD) pattern at a fine-scale (less than 1 km) within continuous habitat and between habitat patches in both regions. Overall, analyses suggest that small-scale dispersal associated with the social structure and dispersal tendencies of this species is reflected in the genetic structure of populations. These findings then provide useful baseline data for supporting local management strategies.
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Affiliation(s)
- Darlina Md Naim
- Division of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, UK.
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Guerreiro MPG, Fontdevila A. Osvaldo and Isis retrotransposons as markers of the Drosophila buzzatii colonisation in Australia. BMC Evol Biol 2011; 11:111. [PMID: 21513573 PMCID: PMC3098803 DOI: 10.1186/1471-2148-11-111] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Accepted: 04/24/2011] [Indexed: 11/10/2022] Open
Abstract
Background Transposable elements (TEs) constitute an important source of genetic variability owing to their jumping and regulatory properties, and are considered to drive species evolution. Several factors that are able to induce TE transposition in genomes have been documented (for example environmental stress and inter- and intra-specific crosses) but in many instances the reasons for TE mobilisation have yet to be elucidated. Colonising populations constitute an ideal model for studying TE behaviour and distribution as they are exposed to different environmental and new demographic conditions. In this study, the distribution of two TEs, Osvaldo and Isis, was examined in two colonising populations of D. buzzatii from Australia. Comparing Osvaldo copy numbers between Australian and Old World (reported in previous studies) colonisations provides a valuable tool for elucidating the colonisation process and the effect of new conditions encountered by colonisers on TEs. Results The chromosomal distributions of Osvaldo and Isis retrotransposons in two colonising populations of D. buzzatii from Australia revealed sites of high insertion frequency (>10%) and low frequency sites. Comparisons between Osvaldo insertion profiles in colonising populations from the Old World and Australia demonstrate a tendency towards a higher number of highly occupied sites with higher insertion frequency in the Old World than in Australian populations. Tests concerning selection against deleterious TE insertions indicate that Isis is more controlled by purifying selection than Osvaldo. The distribution of both elements on chromosomal arms follows a Poisson distribution and there are non-significant positive correlations between highly occupied sites and chromosomal inversions. Conclusions The occupancy profile of Osvaldo and Isis retrotransposons is characterised by the existence of high and low insertion frequency sites in the populations. These results demonstrate that Australian D. buzzatii populations were subjected to a founder effect during the colonisation process. Moreover, there are more sites with high insertion frequency in the Old World colonisation than in the Australian colonisation, indicating a probable stronger bottleneck effect in Australia. The results suggest that selection does not seem to play a major role, compared to demography, in the distribution of transposable elements in the Australian populations.
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Affiliation(s)
- María Pilar García Guerreiro
- Grup de Biología Evolutiva, Departament de Genètica i Microbiologia, Facultat de Biociències, Universitat Autònoma de Barcelona, Spain.
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Ge XJ, Hwang CC, Liu ZH, Huang CC, Huang WH, Hung KH, Wang WK, Chiang TY. Conservation genetics and phylogeography of endangered and endemic shrub Tetraena mongolica (Zygophyllaceae) in Inner Mongolia, China. BMC Genet 2011; 12:1. [PMID: 21205287 PMCID: PMC3025899 DOI: 10.1186/1471-2156-12-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Accepted: 01/04/2011] [Indexed: 11/10/2022] Open
Abstract
Background Tetraena mongolica (Zygophyllaceae), an endangered endemic species in western Inner Mongolia, China. For endemic species with a limited geographical range and declining populations, historical patterns of demography and hierarchical genetic structure are important for determining population structure, and also provide information for developing effective and sustainable management plans. In this study, we assess genetic variation, population structure, and phylogeography of T. mongolica from eight populations. Furthermore, we evaluate the conservation and management units to provide the information for conservation. Results Sequence variation and spatial apportionment of the atpB-rbcL noncoding spacer region of the chloroplast DNA were used to reconstruct the phylogeography of T. mongolica. A total of 880 bp was sequenced from eight extant populations throughout the whole range of its distribution. At the cpDNA locus, high levels of genetic differentiation among populations and low levels of genetic variation within populations were detected, indicating that most seed dispersal was restricted within populations. Conclusions Demographic fluctuations, which led to random losses of genetic polymorphisms from populations, due to frequent flooding of the Yellow River and human disturbance were indicated by the analysis of BEAST skyline plot. Nested clade analysis revealed that restricted gene flow with isolation by distance plus occasional long distance dispersal is the main evolutionary factor affecting the phylogeography and population structure of T. mongolica. For setting a conservation management plan, each population of T. mongolica should be recognized as a conservation unit.
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Affiliation(s)
- Xue-Jun Ge
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China
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BARKER JSF, FRYDENBERG J, SARUP P, LOESCHCKE V. Altitudinal and seasonal variation in microsatellite allele frequencies of Drosophila buzzatii. J Evol Biol 2010; 24:430-9. [DOI: 10.1111/j.1420-9101.2010.02180.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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20
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Phylogeography and conservation of the bull shark (Carcharhinus leucas) inferred from mitochondrial and microsatellite DNA. CONSERV GENET 2010. [DOI: 10.1007/s10592-010-0145-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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The genetic consequences of a demographic bottleneck in an introduced biological control insect. CONSERV GENET 2010. [DOI: 10.1007/s10592-010-0133-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Frydenberg J, Barker JSF, Loeschcke V. Characterization of the shsp genes in Drosophila buzzatii and association between the frequency of Valine mutations in hsp23 and climatic variables along a longitudinal gradient in Australia. Cell Stress Chaperones 2010; 15:271-80. [PMID: 19806471 PMCID: PMC2866996 DOI: 10.1007/s12192-009-0140-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Revised: 08/20/2009] [Accepted: 08/20/2009] [Indexed: 10/20/2022] Open
Abstract
The small heat shock gene (shsp) cluster of Drosophila buzzatii was sequenced and the gene order and DNA sequence were compared with those of the shsps in Drosophila melanogaster. The D. buzzatii shsp cluster contains an inversion and a duplication of hsp26. A phylogenetic tree was constructed based on hsp26 genes from several Drosophila species of the Sophophora and Drosophila subgenera. The tree shows first a separation of the Sophophora and the Drosophila subgenera and then the Drosophila subgenus is divided into the Hawaiian Drosophila and the repleta/virilis groups. Only the latter contain a duplicated hsp26. Comparing the gene organisation of the shsp cluster shows that all the Drosophila subgenus species contain the inversion. Putative heat shock elements (HSE) were found in the promoters of all the shsp and putative regulator elements for tissue specific expression were found in the promoter of hsp23, hsp27 and one of the hsp26 genes. hsp23 was found to be polymorphic for four non-synonymous changes that all lead to exchange of a Valine. The duplicated hsp26 gene in D. buzzatii (phsp26) was polymorphic for two non-synonymous changes. The allele frequencies of these variants were determined in nine D. buzzatii populations covering most of its distribution in Australia using high-resolution melting curves. The allele frequencies of one of the hsp23 variants showed a significant linear regression with longitude and the pooled frequency of the four Valine changes of hsp23 in the nine populations showed a significant linear regression with longitude and with a composite measure of climatic variables.
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Affiliation(s)
- Jane Frydenberg
- Department of Biological Sciences, Ecology and Genetics, University of Aarhus, Ny Munkegade, Bldg. 1540, 8000, Aarhus C, Denmark.
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Piñeiro R, Widmer A, Aguilar JF, Nieto Feliner G. Introgression in peripheral populations and colonization shape the genetic structure of the coastal shrub Armeria pungens. Heredity (Edinb) 2010; 106:228-40. [PMID: 20424642 DOI: 10.1038/hdy.2010.46] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The coastal shrub Armeria pungens has a disjunct Atlantic-Mediterranean distribution. The historic range expansion underlying this distribution was investigated using the nuclear internal transcribed spacer region, three plastid regions (namely trnL-F, trnS-fM and matK) and morphometric data. A highly diverse ancestral lineage was identified in southwest Portugal. More recently, two areas have been colonized: (1) Corsica and Sardinia, where disjunct Mediterranean populations have been established as a result of the long-distance dispersal of Portuguese genotypes, and (2) the southern part of the Atlantic range, Gulf of Cadiz, where a distinct lineage showing no genetic differentiation among populations occurs. Genetic consequences of colonization seem to have been more severe in the Gulf of Cadiz than in Corsica-Sardinia. Although significant genetic divergence is associated with low plastid diversity in the Gulf of Cadiz, in Corsica-Sardinia, the loss of plastid haplotypes was not accompanied by divergence from disjunct Portuguese source populations. In addition, in its northernmost and southernmost populations, A. pungens exhibited evidence for ancient or ongoing introgression from sympatric congeners. Introgression might have created novel genotypes able to expand beyond the latitudinal margins of the species or, alternatively, these genotypes may be the result of surfing of alleles from other species in demographic equilibrium into peripheral populations of A. pungens. Our results highlight the evolutionary significance of genetic drift following the colonization of new areas and the key role of introgression in range expansion.
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Affiliation(s)
- R Piñeiro
- Real Jardín Botánico, CSIC, Madrid, Spain.
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Hutsemekers V, Hardy OJ, Mardulyn P, Shaw AJ, Vanderpoorten A. Macroecological patterns of genetic structure and diversity in the aquatic moss Platyhypnidium riparioides. THE NEW PHYTOLOGIST 2010; 185:852-864. [PMID: 20002317 DOI: 10.1111/j.1469-8137.2009.03094.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Genetic diversity and structure are described in the aquatic moss Platyhypnidium riparioides to assess its dispersal ability at a regional scale and to determine whether patterns of genetic differentiation correlate with environmental variation. Variation at six nuclear microsatellite loci from 50 populations in southern Belgium was investigated through Mantel tests, partial Mantel tests and spatial analysis of molecular variance. Overall patterns of genotypic variation showed strong differentiation among populations at a regional scale (F(ST) = 0.57). The high values of F(IS) observed within populations at both the ramet and genet levels, and the higher proportion of ramets with the same genotype than expected by chance, all point to a strongly clonal or selfing mating system. A genetic discontinuity was identified between northern and southern groups of populations. Within each group, F(ST) and geographical distances were significantly correlated. Partial Mantel tests suggest that genetic and ecological distances are significantly correlated in the southern group. The results point to strong dispersal limitation at the landscape scale and suggest that the southern and northern groups experienced different histories. Within the former, the correlation between genetic and ecological variation is suggestive of reproductive isolation among ecotypes.
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Affiliation(s)
- V Hutsemekers
- Université de Liège, Institut de Botanique, B22 Sart Tilman, B-4000 Liège1, Belgium.
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