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Blondeau Da Silva S, Mwacharo JM, Li M, Ahbara A, Muchadeyi FC, Dzomba EF, Lenstra JA, Da Silva A. IBD sharing patterns as intra-breed admixture indicators in small ruminants. Heredity (Edinb) 2024; 132:30-42. [PMID: 37919398 PMCID: PMC10799084 DOI: 10.1038/s41437-023-00658-x] [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: 10/09/2022] [Revised: 10/18/2023] [Accepted: 10/18/2023] [Indexed: 11/04/2023] Open
Abstract
In this study, we investigated how IBD patterns shared between individuals of the same breed could be informative of its admixture level, with the underlying assumption that the most admixed breeds, i.e. the least genetically isolated, should have a much more fragmented genome. We considered 111 goat breeds (i.e. 2501 individuals) and 156 sheep breeds (i.e. 3304 individuals) from Europe, Africa and Asia, for which beadchip SNP genotypes had been performed. We inferred the breed's level of admixture from: (i) the proportion of the genome shared by breed's members (i.e. "genetic integrity level" assessed from ADMIXTURE software analyses), and (ii) the "AV index" (calculated from Reynolds' genetic distances), used as a proxy for the "genetic distinctiveness". In both goat and sheep datasets, the statistical analyses (comparison of means, Spearman correlations, LM and GAM models) revealed that the most genetically isolated breeds, also showed IBD profiles made up of more shared IBD segments, which were also longer. These results pave the way for further research that could lead to the development of admixture indicators, based on the characterization of intra-breed shared IBD segments, particularly effective as they would be independent of the knowledge of the whole genetic landscape in which the breeds evolve. Finally, by highlighting the fragmentation experienced by the genomes subjected to crossbreeding carried out over the last few generations, the study reminds us of the need to preserve local breeds and the integrity of their adaptive architectures that have been shaped over the centuries.
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Affiliation(s)
| | - Joram M Mwacharo
- Animal and Veterinary Sciences, Scotlands Rural College (SRUC) and Centre for Tropical Livestock Genetics and Health (CTLGH), The Roslin Institute Building, EH25 9RG, Midlothian, UK
- Small Ruminant Genomics, International Centre for Agricultural Research in the Dry Areas (ICARDA), P.O. Box 5689, Addis Ababa, Ethiopia
| | - Menghua Li
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Abulgasim Ahbara
- Animal and Veterinary Sciences, Scotlands Rural College (SRUC) and Centre for Tropical Livestock Genetics and Health (CTLGH), The Roslin Institute Building, EH25 9RG, Midlothian, UK
- Department of Zoology, Faculty of Sciences, Misurata University, Misurata, Libya
| | | | - Edgar Farai Dzomba
- Discipline of Genetics, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South Africa
| | - Johannes A Lenstra
- Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands
| | - Anne Da Silva
- Faculté des Sciences et Techniques de Limoges, E2LIM, 87000, Limoges, France.
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2
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Santostasi NL, Ciucci P, Bearzi G, Bonizzoni S, Gimenez O. Assessing the dynamics of hybridization through a matrix modelling approach. Ecol Modell 2020. [DOI: 10.1016/j.ecolmodel.2020.109120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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3
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Drygala F, Rode-Margono J, Semiadi G, Wirdateti, Frantz AC. Evidence of hybridisation between the common Indonesian banded pig (Sus scrofa vitattus) and the endangered Java warty pig (Sus verrucosus). CONSERV GENET 2020. [DOI: 10.1007/s10592-020-01304-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4
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Zhang C, Lin D, Wang Y, Peng D, Li H, Fei J, Chen K, Yang N, Hu X, Zhao Y, Li N. Widespread introgression in Chinese indigenous chicken breeds from commercial broiler. Evol Appl 2019; 12:610-621. [PMID: 30828377 PMCID: PMC6383742 DOI: 10.1111/eva.12742] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 10/17/2018] [Accepted: 11/15/2018] [Indexed: 12/17/2022] Open
Abstract
Chinese indigenous chickens (CICs) constitute world-renowned genetic resources due to their excellent traits, including early puberty, good meat quality and strong resistance to disease. Unfortunately, the introduction of a large number of commercial chickens in the past two decades has had an adverse effect on CICs. Using the chicken 60 K single nucleotide polymorphism chip, we assessed the genetic diversity and population structure of 1,187 chickens, representing eight Chinese indigenous chicken breeds, two hybrid chicken breeds, two ancestral chicken breeds, two commercial populations and additional red jungle fowl. By investigating haplotype similarity, we found extensive gene introgression from commercial broiler to almost all CICs. Approximately 15% of the genome, on average, of CICs was introgressed, ranging from 0.64% for Tibetan chicken to 21.52% for Huiyang Bearded chicken. Further analysis revealed signals consistent with positive selection in the introgression loci. For the first time, we systematically mapped and quantified introgression from commercial broiler to CICs at the whole genome level. Our data provided a usable resource for chicken genetic diversity, and our findings indicated a dire need for protecting the genetic resources of CICs.
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Affiliation(s)
- Chunyuan Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthChina Agricultural UniversityBeijingChina
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Deng Lin
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthChina Agricultural UniversityBeijingChina
| | - Yuzhe Wang
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Dezhi Peng
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Huifang Li
- Institute of Poultry ScienceChinese Academy of Agricultural SciencesYangzhouChina
| | - Jing Fei
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Kuanwei Chen
- Institute of Poultry ScienceChinese Academy of Agricultural SciencesYangzhouChina
| | - Ning Yang
- National Engineering Laboratory for Animal BreedingChina Agricultural UniversityBeijingChina
| | - Xiaoxiang Hu
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Yiqiang Zhao
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthChina Agricultural UniversityBeijingChina
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
| | - Ning Li
- State Key Laboratory for Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijingChina
- National Engineering Laboratory for Animal BreedingChina Agricultural UniversityBeijingChina
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Randle AM, Spigler RB, Kalisz S. Shifts to earlier selfing in sympatry may reduce costs of pollinator sharing. Evolution 2018; 72:1587-1599. [PMID: 29917223 DOI: 10.1111/evo.13522] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Revised: 05/28/2018] [Accepted: 06/07/2018] [Indexed: 01/02/2023]
Abstract
Coexisting plant congeners often experience strong competition for resources. Competition for pollinators can result in direct fitness costs via reduced seed set or indirect costs via heterospecific pollen transfer (HPT), causing subsequent gamete loss and unfit hybrid offspring production. Autonomous selfing may alleviate these costs, but to preempt HPT, selfing should occur early, before opportunities for HPT occur (i.e., "preemptive selfing hypothesis"). We evaluated conditions for this hypothesis in Collinsia sister species, C. linearis and C. rattanii. In field studies, we found virtually identical flowering times and pollinator sharing between congeners in sympatric populations. Compared to allopatric populations, sympatric C. linearis populations enjoyed higher pollinator visitation rates, whereas visitation to C. rattanii did not differ in sympatry. Importantly, the risk of HPT to each species in sympatry was strongly asymmetrical; interspecies visits comprised 40% of all flower-to-flower visits involving C. rattanii compared to just 4% involving C. linearis. Additionally, our greenhouse experiment demonstrated a strong cost of hybridization when C. rattanii was the pollen donor. Together, these results suggest that C. rattanii pays the greatest cost of pollinator sharing. Matching predictions of the preemptive selfing hypothesis, C. rattanii exhibit significantly earlier selfing in sympatric relative to allopatric populations.
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Affiliation(s)
- April M Randle
- Department of Environmental Science, University of San Francisco, San Francisco, California, 94117
| | - Rachel B Spigler
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122
| | - Susan Kalisz
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Knoxville, Tennessee, 37919
- Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, 15213
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6
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Quilodrán CS, Austerlitz F, Currat M, Montoya-Burgos JI. Cryptic Biological Invasions: a General Model of Hybridization. Sci Rep 2018; 8:2414. [PMID: 29402926 PMCID: PMC5799175 DOI: 10.1038/s41598-018-20543-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 01/19/2018] [Indexed: 12/02/2022] Open
Abstract
The dispersal of non-native genes due to hybridization is a form of cryptic invasion with growing concern in evolution and conservation. This includes the spread of transgenic genes and antibiotic resistance. To investigate how genes and phenotypes are transmitted, we developed a general model that, for the first time, considers concurrently: multiple loci, quantitative and qualitative gene expression, assortative mating, dominance/recessivity inheritance and density-dependent demographic effects. Selection acting on alleles or genotypes can also be incorporated. Our results reveal that the conclusions about how hybridization threatens a species can be biased if they are based on single-gene models, while considering two or more genes can correct this bias. We also show that demography can amplify or balance the genetic effects, evidencing the need of jointly incorporating both processes. By implementing our model in a real case, we show that mallard ducks introduced in New Zealand benefit from hybridization to replace native grey-ducks. Total displacement can take a few generations and occurs by interspecific competition and by competition between hybrids and natives, demonstrating how hybridization may facilitate biological invasions. We argue that our general model represents a powerful tool for the study of a wide range of biological and societal questions.
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Affiliation(s)
- Claudio S Quilodrán
- Department of Zoology, University of Oxford, Oxford, OX1 3PS, United Kingdom.,Laboratory of vertebrate evolution, Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland.,Laboratory of anthropology, genetics and peopling history, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland
| | - Frédéric Austerlitz
- Laboratory of Eco-Anthropology and Ethnobiology, National Museum of Natural History, National Centre for Scientific Research, University Paris-Diderot, Paris, France
| | - Mathias Currat
- Laboratory of anthropology, genetics and peopling history, Department of Genetics and Evolution-Anthropology Unit, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland
| | - Juan I Montoya-Burgos
- Laboratory of vertebrate evolution, Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland. .,Institute of Genetics and Genomics in Geneva (IGE3), Geneva, Switzerland.
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7
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Hybridization can facilitate species invasions, even without enhancing local adaptation. Proc Natl Acad Sci U S A 2018; 113:10210-4. [PMID: 27601582 DOI: 10.1073/pnas.1605626113] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The founding population in most new species introductions, or at the leading edge of an ongoing invasion, is likely to be small. Severe Allee effects-reductions in individual fitness at low population density-may then result in a failure of the species to colonize, even if the habitat could support a much larger population. Using a simulation model for plant populations that incorporates demography, mating systems, quantitative genetics, and pollinators, we show that Allee effects can potentially be overcome by transient hybridization with a resident species or an earlier colonizer. This mechanism does not require the invocation of adaptive changes usually attributed to invasions following hybridization. We verify our result in a case study of sequential invasions by two plant species where the outcrosser Cakile maritima has replaced an earlier, inbreeding, colonizer Cakile edentula (Brassicaceae). Observed historical rates of replacement are consistent with model predictions from hybrid-alleviated Allee effects in outcrossers, although other causes cannot be ruled out.
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8
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Paffetti D, Travaglini D, Labriola M, Buonamici A, Bottalico F, Materassi A, Fasano G, Nocentini S, Vettori C. Land use and wind direction drive hybridization between cultivated poplar and native species in a Mediterranean floodplain environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 610-611:1400-1412. [PMID: 28854483 DOI: 10.1016/j.scitotenv.2017.08.238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 08/22/2017] [Accepted: 08/22/2017] [Indexed: 06/07/2023]
Abstract
Deforestation and intensive land use management with plantations of fast-growing tree species, like Populus spp., may endanger native trees not only by eliminating or reducing their habitats, but also by diminishing their species integrity via hybridization and introgression. The genus Populus has persistent natural hybrids because clonal and sexual reproduction is common. The objective of this study was to assess the effect of land use management of poplar plantations on the spatial genetic structure and species composition in poplar stands. Specifically, we studied the potential breeding between natural and cultivated poplar populations in the Mediterranean environment to gain insight into spontaneous hybridization events between exotic and native poplars; we also used a GIS-based model to evaluate the potential threats related to an intensive land use management. Two study areas, both near to poplar plantations (P.×euramericana), were designated in the native mixed stands of P. alba, P. nigra and P.×canescens within protected areas. We found that the spatial genetic structure differed between the two stands and their differences depended on their environmental features. We detected a hybridization event with P.×canescens that was made possible by the synchrony of flowering between the poplar plantation and P.×canescens and facilitated by the wind intensity and direction favoring the spread of pollen. Taken together, our results indicate that natural and artificial barriers are crucial to mitigate the threats, and so they should be explicitly considered in land use planning. For example, our results suggest the importance of conserving rows of trees and shrubs along rivers and in agricultural landscapes. In sum, it is necessary to understand, evaluate, and monitor the spread of exotic species and genetic material to ensure effective land use management and mitigation of their impact on native tree populations.
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Affiliation(s)
- Donatella Paffetti
- Department of Agriculture, Food and Environmental Sciences, Agricultural Genetics Section, University of Florence, P.le delle Cascine 28, 50144 Florence, Italy.
| | - Davide Travaglini
- Department of Agricultural, Food and Forestry Systems, University of Florence, Via San Bonaventura 13, 50145, Florence, Italy.
| | - Mariaceleste Labriola
- Department of Agriculture, Food and Environmental Sciences, Agricultural Genetics Section, University of Florence, P.le delle Cascine 28, 50144 Florence, Italy; Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy.
| | - Anna Buonamici
- Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy.
| | - Francesca Bottalico
- Department of Agricultural, Food and Forestry Systems, University of Florence, Via San Bonaventura 13, 50145, Florence, Italy.
| | - Alessandro Materassi
- Institute for Biometeorology (IBIMET), National Research Council (CNR), Via Caproni 8, 50145 Firenze, Italy.
| | - Gianni Fasano
- Institute for Biometeorology (IBIMET), National Research Council (CNR), Via Caproni 8, 50145 Firenze, Italy.
| | - Susanna Nocentini
- Department of Agricultural, Food and Forestry Systems, University of Florence, Via San Bonaventura 13, 50145, Florence, Italy.
| | - Cristina Vettori
- Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy.
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9
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Pieper SJ, Nicholls AA, Freeland JR, Dorken ME. Asymmetric Hybridization in Cattails (Typha spp.) and Its Implications for the Evolutionary Maintenance of Native Typha latifolia. J Hered 2017; 108:479-487. [DOI: 10.1093/jhered/esx036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 04/12/2017] [Indexed: 12/11/2022] Open
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10
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Todesco M, Pascual MA, Owens GL, Ostevik KL, Moyers BT, Hübner S, Heredia SM, Hahn MA, Caseys C, Bock DG, Rieseberg LH. Hybridization and extinction. Evol Appl 2016; 9:892-908. [PMID: 27468307 PMCID: PMC4947151 DOI: 10.1111/eva.12367] [Citation(s) in RCA: 339] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/28/2016] [Indexed: 01/29/2023] Open
Abstract
Hybridization may drive rare taxa to extinction through genetic swamping, where the rare form is replaced by hybrids, or by demographic swamping, where population growth rates are reduced due to the wasteful production of maladaptive hybrids. Conversely, hybridization may rescue the viability of small, inbred populations. Understanding the factors that contribute to destructive versus constructive outcomes of hybridization is key to managing conservation concerns. Here, we survey the literature for studies of hybridization and extinction to identify the ecological, evolutionary, and genetic factors that critically affect extinction risk through hybridization. We find that while extinction risk is highly situation dependent, genetic swamping is much more frequent than demographic swamping. In addition, human involvement is associated with increased risk and high reproductive isolation with reduced risk. Although climate change is predicted to increase the risk of hybridization‐induced extinction, we find little empirical support for this prediction. Similarly, theoretical and experimental studies imply that genetic rescue through hybridization may be equally or more probable than demographic swamping, but our literature survey failed to support this claim. We conclude that halting the introduction of hybridization‐prone exotics and restoring mature and diverse habitats that are resistant to hybrid establishment should be management priorities.
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Affiliation(s)
- Marco Todesco
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Mariana A Pascual
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Gregory L Owens
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Katherine L Ostevik
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Brook T Moyers
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada; Department of Bioagricultural Sciences and Pest Management Colorado State University Ft Collins CO USA
| | - Sariel Hübner
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Sylvia M Heredia
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Min A Hahn
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Celine Caseys
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Dan G Bock
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Loren H Rieseberg
- Department of Botany and Biodiversity Research Centre University of British Columbia Vancouver BC Canada; Department of Biology Indiana University Bloomington IN USA
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11
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Quilodrán CS, Currat M, Montoya-Burgos JI. A general model of distant hybridization reveals the conditions for extinction in Atlantic salmon and brown trout. PLoS One 2014; 9:e101736. [PMID: 25003336 PMCID: PMC4086968 DOI: 10.1371/journal.pone.0101736] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 06/10/2014] [Indexed: 11/19/2022] Open
Abstract
Interspecific hybridization is common in nature but can be increased in frequency or even originated by human actions, such as species introduction or habitat modification, which may threaten species persistence. When hybridization occurs between distantly related species, referred to as "distant hybridization," the resulting hybrids are generally infertile or fertile but do not undergo chromosomal recombination during gametogenesis. Here, we present a model describing this frequent but poorly studied interspecific hybridization to assess its consequences on parental species and to anticipate the conditions under which they can reach extinction. Our general model fully incorporates three important processes: density-dependent competition, dominance/recessivity inheritance of traits and assortative mating. We demonstrate its use and flexibility by assessing population extinction risk between Atlantic salmon and brown trout in Norway, whose interbreeding has recently increased due to farmed fish releases into the wild. We identified the set of conditions under which hybridization may threaten salmonid species. Thanks to the flexibility of our model, we evaluated the effect of an additional risk factor, a parasitic disease, and showed that the cumulative effects dramatically increase the extinction risk. The consequences of distant hybridization are not genetically, but demographically mediated. Our general model is useful to better comprehend the evolution of such hybrid systems and we demonstrated its importance in the field of conservation biology to set up management recommendations when this increasingly frequent type of hybridization is in action.
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Affiliation(s)
- Claudio S. Quilodrán
- Laboratory of anthropology, genetics and peopling history (AGP), Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
- Laboratory of molecular phylogeny and evolution in vertebrates, Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
| | - Mathias Currat
- Laboratory of anthropology, genetics and peopling history (AGP), Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
- * E-mail:
| | - Juan I. Montoya-Burgos
- Laboratory of molecular phylogeny and evolution in vertebrates, Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
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12
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A stochastic cellular model with uncertainty analysis to assess the risk of transgene invasion after crop-wild hybridization: Oilseed rape and wild radish as a case study. Ecol Modell 2014. [DOI: 10.1016/j.ecolmodel.2014.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Baskett ML, Gomulkiewicz R. Introgressive hybridization as a mechanism for species rescue. THEOR ECOL-NETH 2011. [DOI: 10.1007/s12080-011-0118-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Ellstrand NC, Biggs D, Kaus A, Lubinsky P, McDade LA, Preston K, Prince LM, Regan HM, Rorive V, Ryder OA, Schierenbeck KA. Got Hybridization? A Multidisciplinary Approach for Informing Science Policy. Bioscience 2010. [DOI: 10.1525/bio.2010.60.5.8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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15
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16
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Identification of a large hybrid zone between sympatric sibling species of Triatoma dimidiata in the Yucatan peninsula, Mexico, and its epidemiological importance. INFECTION GENETICS AND EVOLUTION 2009; 9:1345-51. [DOI: 10.1016/j.meegid.2009.09.009] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Revised: 09/14/2009] [Accepted: 09/21/2009] [Indexed: 11/23/2022]
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17
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18
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Currat M, Ruedi M, Petit RJ, Excoffier L. The hidden side of invasions: massive introgression by local genes. Evolution 2008; 62:1908-20. [PMID: 18452573 DOI: 10.1111/j.1558-5646.2008.00413.x] [Citation(s) in RCA: 276] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Despite hundreds of reports involving both plants and animals, the mechanisms underlying introgression remain obscure, even if some form of selection is frequently invoked. Introgression has repeatedly been reported in species that have recently colonized a new habitat, suggesting that demographic processes should be given more attention for understanding the mechanisms of introgression. Here we show by spatially explicit simulations that massive introgression of neutral genes takes place during the invasion of an occupied territory if interbreeding is not severely prevented between the invading and the local species. We also demonstrate that introgression occurs almost exclusively from the local to the invading species, especially for populations located far away from the source of the invasion, and this irrespective of the relative densities of the two species. This pattern is strongest at markers experiencing reduced gene flow, in keeping with the observation that organelle genes are often preferentially introgressed across species boundaries. A survey of the literature shows that a majority of published empirical studies of introgression during range expansions, in animals and in plants, follow the predictions of our model. Our results imply that speciation genes can be identified by comparing genomes of interfertile native and invading species pairs.
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Affiliation(s)
- Mathias Currat
- Computational and Molecular Population Genetics Laboratory, Institute of Zoology, University of Bern, Baltzerstrasse 6, 3012 Berne, Switzerland.
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19
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HOOFTMAN DANNYAP, JONG MAAIKEJDE, OOSTERMEIJER JGERARDB, DEN NIJS HANS(JCM. Modelling the long-term consequences of crop-wild relative hybridization: a case study using four generations of hybrids. J Appl Ecol 2007. [DOI: 10.1111/j.1365-2664.2007.01341.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Demon I, Haccou P, van den Bosch F. Introgression of resistance genes between populations: a model study of insecticide resistance in Bemisia tabaci. Theor Popul Biol 2007; 72:292-304. [PMID: 17658572 DOI: 10.1016/j.tpb.2007.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 05/14/2007] [Accepted: 06/20/2007] [Indexed: 12/01/2022]
Abstract
Introgression is a key process in conservation biology, genetic modification of (crop) species and in the evolutionary ecology of many species. Here we consider the case of introgression of insecticide resistance in the whitefly, Bemisia tabaci. B. tabaci is a species complex consisting of a range of biotypes, known to have a high degree of inter-biotype reproductive isolation. In areas where insecticide resistant and susceptible biotypes of B. tabaci coexist, introgression of the resistance gene will have considerable consequences for whitefly control. Using a stochastic branching process model we calculate the relative importance of life-history traits in determining the probability of introgression given that a hybridization event has occurred. We show that a fitness cost expressed through the average number of eggs laid, has the largest effect on the introgression probability as compared to fitness costs expressed through other life-history parameters. These results change when we consider a reproductive isolation mechanism, for which we show that the fitness cost expressed through the male survival and mating probability have the largest effect on the probability of introgression.
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Affiliation(s)
- Inez Demon
- Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.
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21
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Introgressive hybridization as the breakdown of postzygotic isolation: a theoretical perspective. Ecol Res 2007. [DOI: 10.1007/s11284-007-0384-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Gérard PR, Klein EK, Austerlitz F, Fernández-Manjarrés JF, Frascaria-Lacoste N. Assortative mating and differential male mating success in an ash hybrid zone population. BMC Evol Biol 2006; 6:96. [PMID: 17107611 PMCID: PMC1660552 DOI: 10.1186/1471-2148-6-96] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2006] [Accepted: 11/15/2006] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND The structure and evolution of hybrid zones depend mainly on the relative importance of dispersal and local adaptation, and on the strength of assortative mating. Here, we study the influence of dispersal, temporal isolation, variability in phenotypic traits and parasite attacks on the male mating success of two parental species and hybrids by real-time pollen flow analysis. We focus on a hybrid zone population between the two closely related ash species Fraxinus excelsior L. (common ash) and F. angustifolia Vahl (narrow-leaved ash), which is composed of individuals of the two species and several hybrid types. This population is structured by flowering time: the F. excelsior individuals flower later than the F. angustifolia individuals, and the hybrid types flower in-between. Hybrids are scattered throughout the population, suggesting favorable conditions for their local adaptation. We estimate jointly the best-fitting dispersal kernel, the differences in male fecundity due to variation in phenotypic traits and level of parasite attack, and the strength of assortative mating due to differences in flowering phenology. In addition, we assess the effect of accounting for genotyping error on these estimations. RESULTS We detected a very high pollen immigration rate and a fat-tailed dispersal kernel, counter-balanced by slight phenological assortative mating and short-distance pollen dispersal. Early intermediate flowering hybrids, which had the highest male mating success, showed optimal sex allocation and increased selfing rates. We detected asymmetry of gene flow, with early flowering trees participating more as pollen donors than late flowering trees. CONCLUSION This study provides striking evidence that long-distance gene flow alone is not sufficient to counter-act the effects of assortative mating and selfing. Phenological assortative mating and short-distance dispersal can create temporal and spatial structuring that appears to maintain this hybrid population. The asymmetry of gene flow, with higher fertility and increased selfing, can potentially confer a selective advantage to early flowering hybrids in the zone. In the event of climate change, hybridization may provide a means for F. angustifolia to further extend its range at the expense of F. excelsior.
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Affiliation(s)
- Pierre R Gérard
- Laboratoire Ecologie, Systématique, Evolution, UMR ENGREF-CNRS 8079, Bât. 360, Université Paris-Sud, 91405 Orsay Cedex, France
| | - Etienne K Klein
- Unité de Biométrie, INRA, Domaine St-Paul, Site Agroparc, 84914 Avignon cedex 9, France
| | - Frédéric Austerlitz
- Laboratoire Ecologie, Systématique, Evolution, UMR ENGREF-CNRS 8079, Bât. 360, Université Paris-Sud, 91405 Orsay Cedex, France
| | - Juan F Fernández-Manjarrés
- Laboratoire Ecologie, Systématique, Evolution, UMR ENGREF-CNRS 8079, Bât. 360, Université Paris-Sud, 91405 Orsay Cedex, France
| | - Nathalie Frascaria-Lacoste
- Laboratoire Ecologie, Systématique, Evolution, UMR ENGREF-CNRS 8079, Bât. 360, Université Paris-Sud, 91405 Orsay Cedex, France
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Abstract
The emergence of hybrids between native and introduced species is an increasingly widespread problem which can alter entire ecosystems. We present a general model for the hybridization of two plant species to investigate the conditions under which hybrid invasions can occur, and the ecological and genetic consequences of such hybridizations. We find that parental compatibility and fecundity are important determinants of whether (and at what rate) hybrid genotypes emerge. Enhanced hybrid fitness traits affect both the population's genetic structure and total rate of increase, with rapid selection for the fittest genotype. Conversely, if different genotypes maximize different life-history characteristics, the ensuing population can be genetically very variable. The model provides a novel approach to evaluate the contributions of population dynamic and genetic processes in the study of hybrid invasions.
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Affiliation(s)
- Richard J Hall
- Department of Environmental Science and Policy, University of California-Davis, 1 Shields Avenue, Davis, CA 95616, USA.
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Hegde SG, Nason JD, Clegg JM, Ellstrand NC. THE EVOLUTION OF CALIFORNIA'S WILD RADISH HAS RESULTED IN THE EXTINCTION OF ITS PROGENITORS. Evolution 2006. [DOI: 10.1111/j.0014-3820.2006.tb01197.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hegde SG, Nason JD, Clegg JM, Ellstrand NC. THE EVOLUTION OF CALIFORNIA'S WILD RADISH HAS RESULTED IN THE EXTINCTION OF ITS PROGENITORS. Evolution 2006. [DOI: 10.1554/05-634.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pilson D, Prendeville HR. Ecological Effects of Transgenic Crops and the Escape of Transgenes into Wild Populations. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2004. [DOI: 10.1146/annurev.ecolsys.34.011802.132406] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
▪ Abstract Ecological risks associated with the release of transgenic crops include nontarget effects of the crop and the escape of transgenes into wild populations. Nontarget effects can be of two sorts: (a) unintended negative effects on species that do not reduce yield and (b) greater persistence of the crop in feral populations. Conventional agricultural methods, such as herbicide and pesticide application, have large and well-documented nontarget effects. To the extent that transgenes have more specific target effects, transgenic crops may have fewer nontarget effects. The escape of transgenes into wild populations, via hybridization and introgression, could lead to increased weediness or to the invasion of new habitats by the wild population. In addition, native species with which the wild plant interacts (including herbivores, pathogens, and other plant species in the community) could be negatively affected by “transgenic-wild” plants. Conventional crop alleles have facilitated the evolution of increased weediness in several wild populations. Thus, some transgenes that allow plants to tolerate biotic and abiotic stress (e.g., insect resistance, drought tolerance) could have similar effects.
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Affiliation(s)
- Diana Pilson
- School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0118;,
| | - Holly R. Prendeville
- School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0118;,
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