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Chao YS, Yang YW, Sheue CR, Lai IL. Niche and phenotypic differentiation in fern hybrid speciation, a case study of Pteris fauriei (Pteridaceae). ANNALS OF BOTANY 2024; 134:71-84. [PMID: 38470192 DOI: 10.1093/aob/mcae037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 03/11/2024] [Indexed: 03/13/2024]
Abstract
BACKGROUND AND AIMS Niche differentiation is a crucial issue in speciation. Although it has a well-known role in adaptive processes of hybrid angiosperms, it is less understood in hybrid ferns. Here, we investigate whether an intermediate ecological niche of a fern hybrid is a novel adaptation that provides insights into fern hybrid speciation. METHODS Pteris fauriei (Pteridaceae) is a natural hybrid fern, occurring in environments between its parent species. The maternal Pteris minor is found in sunny areas, but the habitat of the paternal Pteris latipinna is shady. We combined data from morphology, leaf anatomy and photosynthetic traits to explore adaptation and differentiation, along with measuring the environmental features of their niches. We also performed experiments in a common garden to understand ecological plasticity. KEY RESULTS The hybrid P. fauriei was intermediate between the parent species in stomatal density, leaf anatomical features and photosynthetic characteristics in both natural habitats and a common garden. Interestingly, the maternal P. minor showed significant environmental plasticity and was more similar to the hybrid P. fauriei in the common garden, suggesting that the maternal species experiences stress in its natural habitats but thrives in environments similar to those of the hybrid. CONCLUSIONS Based on the similar niche preferences of the hybrid and parents, we propose hybrid superiority. Our results indicate that the hybrid P. fauriei exhibits greater fitness and can compete with and occupy the initial niches of the maternal P. minor. Consequently, we suggest that the maternal P. minor has experienced a niche shift, elucidating the pattern of niche differentiation in this hybrid group. These findings offer a potential explanation for the frequent occurrence of hybridization in ferns and provide new insights into fern hybrid speciation, enhancing our understanding of fern diversity.
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Affiliation(s)
- Yi-Shan Chao
- Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Yao-Wei Yang
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chiou-Rong Sheue
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan
- Global Change Biology Research Center, National Chung Hsing University, Taichung, Taiwan
| | - I-Ling Lai
- Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung, Taiwan
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2
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Martins ARP, Warren NB, McMillan WO, Barrett RDH. Spatiotemporal dynamics in butterfly hybrid zones. INSECT SCIENCE 2024; 31:328-353. [PMID: 37596954 DOI: 10.1111/1744-7917.13262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 07/13/2023] [Accepted: 07/21/2023] [Indexed: 08/21/2023]
Abstract
Evaluating whether hybrid zones are stable or mobile can provide novel insights for evolution and conservation biology. Butterflies exhibit high sensitivity to environmental changes and represent an important model system for the study of hybrid zone origins and maintenance. Here, we review the literature exploring butterfly hybrid zones, with a special focus on their spatiotemporal dynamics and the potential mechanisms that could lead to their movement or stability. We then compare different lines of evidence used to investigate hybrid zone dynamics and discuss the strengths and weaknesses of each approach. Our goal with this review is to reveal general conditions associated with the stability or mobility of butterfly hybrid zones by synthesizing evidence obtained using different types of data sampled across multiple regions and spatial scales. Finally, we discuss spatiotemporal dynamics in the context of a speciation/divergence continuum, the relevance of hybrid zones for conservation biology, and recommend key topics for future investigation.
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Affiliation(s)
- Ananda R Pereira Martins
- Redpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, Quebec, Canada
- Smithsonian Tropical Research Institute, Gamboa, Panama City, Panama
| | - Natalie B Warren
- Redpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, Quebec, Canada
| | - W Owen McMillan
- Smithsonian Tropical Research Institute, Gamboa, Panama City, Panama
| | - Rowan D H Barrett
- Redpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, Quebec, Canada
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3
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Tominaga A, Yoshikawa N, Matsui M, Nagata N, Sato Y. The emergence of a cryptic lineage and cytonuclear discordance through past hybridization in the Japanese fire-bellied newt, Cynops pyrrhogaster (Amphibia: Urodela). Biol J Linn Soc Lond 2022. [DOI: 10.1093/biolinnean/blac120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Discrepancies in geographic variation patterns between nuclear DNA and mitochondrial DNA (mtDNA) are the result of the complicated differentiation processes in organisms and are the key to understanding their true evolutionary processes. The genetic differentiation of the northern and Southern-Izu lineages of the Japanese newt, Cynops pyrrhogaster, was investigated through their single nucleotide polymorphism variations obtained via multiplexed ISSR genotyping by sequencing (MIG-seq). We found three genetic groups (Tohoku, N-Kanto and S-Kanto), that were not detected by mtDNA variations, in the northern lineage. N-Kanto has intermediate genetic characteristics between Tohoku and S-Kanto. The genetic groups are now moderately isolated from each other and have unique genetic characteristics. An estimation of the evolutionary history using the approximate Bayesian computation (ABC) approach suggested that Tohoku diverged from the common ancestor of S-Kanto and S-Izu. Then, S-Kanto and S-Izu split, and the recent hybridization between Tohoku and S-Kanto gave rise to N-Kanto. The origin of N-Kanto through the hybridization is relatively young and seems to be related to changes in the distributions of Tohoku and S-Kanto as a result of climatic oscillation in the Pleistocene. We conclude that the mitochondrial genome of S-Kanto was captured in Tohoku and that the original mitochondrial genome of Tohoku was entirely removed through hybridization.
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Affiliation(s)
- Atsushi Tominaga
- Faculty of Education, University of the Ryukyus , Senbaru 1, Nishihara, Okinawa 903-0213 , Japan
| | - Natsuhiko Yoshikawa
- National Museum of Nature and Science , 4-1-1 Amakubo, Tsukuba, Ibaraki 305 - 0005 , Japan
| | - Masafumi Matsui
- Graduate School of Human and Environmental Studies, Kyoto University , Yoshida Nihonmatsu-cho, Sakyo, Kyoto 606 - 8501 , Japan
| | - Nobuaki Nagata
- National Museum of Nature and Science , 4-1-1 Amakubo, Tsukuba, Ibaraki 305 - 0005 , Japan
| | - Yukuto Sato
- Faculty of Medicine, University of the Ryukyus , Uehara 207, Nishihara, Okinawa 903 - 0215 , Japan
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Bhargav VV, Freeland JR, Dorken ME. Evidence of hybrid breakdown among invasive hybrid cattails (Typha × glauca). Heredity (Edinb) 2022; 129:195-201. [PMID: 35933492 PMCID: PMC9411187 DOI: 10.1038/s41437-022-00557-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 07/19/2022] [Accepted: 07/25/2022] [Indexed: 11/09/2022] Open
Abstract
Interspecific hybridization has varied consequences for offspring fitness, with implications for the maintenance of species integrity. Hybrid vigour, when it occurs, can peak in first-generation (F1) hybrids and then decline in advanced-generation (F2+) hybrids. This hybrid breakdown, together with the processes affecting patterns of hybridization and hybrid fitness, determine the evolutionary stability of hybrid zones. An extensive hybrid zone in North America involving the cattails Typha latifolia, T. angustifolia, and their invasive hybrid T. × glauca is characterized by hybrid vigour among F1s, but the fitness of advanced-generation hybrids has not been studied. We compared seed germination and plant growth of T. latifolia (parental L), F1 T. × glauca (F1), hybrid backcrosses to T. angustifolia (bcA) and T. latifolia (bcL), and advanced-generation (F2) hybrids. Consistent with expectations under hybrid breakdown, we found reduced plant growth for F2 hybrids in comparison with F1s (plant height and above-ground biomass) and parental Ls (above-ground biomass). Backcrossed hybrids had intermediate measures of plant growth and bcLs were characterized by reduced seed germination in comparison with parental Ls. Hybrid breakdown could make the formation of F1s in North America finite because (1) hybridization among cattails is asymmetric, with T. angustifolia but not T. latifolia subject to genetic swamping, and (2) T. angustifolia is less common and subject to competitive displacement by F1s. Hybrid breakdown is therefore expected to reduce hybrid frequencies over time, contributing to the long-term maintenance of T. latifolia - the only native cattail in the study region.
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Affiliation(s)
- V Vikram Bhargav
- Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, ON, K9L 0G2, Canada
| | - Joanna R Freeland
- Department of Biology, Trent University, 1600 West Bank Drive, Peterborough, ON, K9L 0G2, Canada
| | - Marcel E Dorken
- Department of Biology, Trent University, 1600 West Bank Drive, Peterborough, ON, K9L 0G2, Canada.
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5
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Barrett CF, Huebner CD, Bender ZA, Budinsky TA, Corbett CW, Latvis M, McKain MR, Motley M, Skibicki SV, Thixton HL, Santee MV, Cumberledge AN. Digitized collections elucidate invasion history and patterns of awn polymorphism in Microstegium vimineum. AMERICAN JOURNAL OF BOTANY 2022; 109:689-705. [PMID: 35435240 PMCID: PMC9327524 DOI: 10.1002/ajb2.1852] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/30/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
PREMISE Digitized collections can help illuminate the mechanisms behind the establishment and spread of invasive plants. These databases provide a record of traits in space and time that allows for investigation of abiotic and biotic factors that influence invasive species. METHODS Over 1100 digitized herbarium records were examined to investigate the invasion history and trait variation of Microstegium vimineum. Presence-absence of awns was investigated to quantify geographic patterns of this polymorphic trait, which serves several functions in grasses, including diaspore burial and dispersal to germination sites. Floret traits were further quantified, and genomic analyses of contemporary samples were conducted to investigate the history of M. vimineum's introduction and spread into North America. RESULTS Herbarium records revealed similar patterns of awn polymorphism in native and invaded ranges of M. vimineum, with awned forms predominating at higher latitudes and awnless forms at lower latitudes. Herbarium records and genomic data suggested initial introduction and spread of the awnless form in the southeastern United States, followed by a putative secondary invasion and spread of the awned form from eastern Pennsylvania. Awned forms have longer florets, and floret size varies significantly with latitude. There is evidence of a transition zone with short-awned specimens at mid-latitudes. Genomic analyses revealed two distinct clusters corresponding to awnless and awned forms, with evidence of admixture. CONCLUSIONS Our results demonstrate the power of herbarium data to elucidate the invasion history of a problematic weed in North America and, together with genomic data, reveal a possible key trait in introduction success: presence or absence of an awn.
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Affiliation(s)
- Craig F. Barrett
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
| | - Cynthia D. Huebner
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
- USDA Forest Service Northern Research Station180 Canfield StreetMorgantownWest Virginia26505USA
- Division of Plant and Soil Sciences, 4100 Agricultural Sciences BuildingP.O. Box 6108MorgantownWest Virginia26506USA
| | - Zoe A. Bender
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
- Department of BiologyGettysburg College300 North Washington StreetGettysburgPennsylvania17325USA
| | - Trezalka A. Budinsky
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
- Department of Biological SciencesUniversity of Pittsburgh4249 Fifth AvenuePittsburghPennsylvania15260USA
| | - Cameron W. Corbett
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
| | - Maribeth Latvis
- Department of Natural Resource ManagementSouth Dakota State University, 1390 College Avenue, South Dakota State UniversityBrookingsSouth Dakota57007USA
| | - Michael R. McKain
- Department of Biological SciencesUniversity of Alabama300 Hackberry LaneTuscaloosaAlabama35487USA
| | - M'Kayla Motley
- Department of Biological SciencesUniversity of Alabama300 Hackberry LaneTuscaloosaAlabama35487USA
| | - Samuel V. Skibicki
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
| | - Hana L. Thixton
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
| | - Mathilda V. Santee
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
| | - Aubrey N. Cumberledge
- Department of BiologyWest Virginia University53 Campus DriveMorgantownWest Virginia26506USA
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Gilg MR, Kerns EV, Gutierrez-Bayona NE, Kooyomjian C, Hinojosa NA. Dynamic Cohort Analysis Reveals Fluctuating Patterns of Selection Within a Hybrid Zone Between the Killifish Fundulus heteroclitus and F. grandis. Evol Biol 2021. [DOI: 10.1007/s11692-021-09553-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Tominaga A, Matsui M, Matsui M. Structure and movement of the hybrid zone between two divergent lineages of the Japanese newt
Cynops pyrrhogaster
(Amphibia: Urodela) in central Japan. J ZOOL SYST EVOL RES 2021. [DOI: 10.1111/jzs.12467] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
| | - Masafumi Matsui
- Graduate School of Human and Environmental Studies Kyoto University Kyoto Japan
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Barreto SB, Knowles LL, Affonso PRADM, Batalha-Filho H. Riverscape properties contribute to the origin and structure of a hybrid zone in a Neotropical freshwater fish. J Evol Biol 2020; 33:1530-1542. [PMID: 32862491 DOI: 10.1111/jeb.13689] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 08/03/2020] [Accepted: 08/04/2020] [Indexed: 11/28/2022]
Abstract
Understanding the structure of hybrid zones provides valuable insights about species boundaries and speciation, such as the evolution of barriers to gene flow and the strength of selection. In river networks, studying evolutionary processes in hybrid zones can be especially challenging, given the influence of past and current river properties along with biological species-specific traits. Here, we suggest that a natural hybrid zone between two divergent lineages of the sexually dimorphic Neotropical fish Nematocharax venustus was probably established by secondary contact as a result of a river capture event between the Contas and Pardo river basins. This putative river capture is supported by hydrogeological evidence of elbows of capture, wind gaps and geological faults. The morphological (colour pattern) and genetic (mtDNA and RADseq) variation reveal a clinal transition between parental lineages along the main river, with predominance of F2 hybrids at the centre of the hybrid zone, absence of early generation backcrosses and different levels of hybridization in the tributaries. We highlight that different sources of information are crucial for understanding how the riverscape spatial history influences the connectivity between and within river systems and, consequently, the dynamics of gene flow between freshwater lineages/species.
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Affiliation(s)
| | - L Lacey Knowles
- Department of Ecology and Evolutionary Biology, Museum of Zoology, University of Michigan, Ann Arbor, MI, USA
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9
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Päckert M, Ait Belkacem A, Wolfgramm H, Gast O, Canal D, Giacalone G, Lo Valvo M, Vamberger M, Wink M, Martens J, Stuckas H. Genetic admixture despite ecological segregation in a North African sparrow hybrid zone (Aves, Passeriformes, Passer domesticus × Passer hispaniolensis). Ecol Evol 2019; 9:12710-12726. [PMID: 31788209 PMCID: PMC6875665 DOI: 10.1002/ece3.5744] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/30/2019] [Accepted: 09/02/2019] [Indexed: 11/29/2022] Open
Abstract
Under different environmental conditions, hybridization between the same species might result in different patterns of genetic admixture. Particularly, species pairs with large distribution ranges and long evolutionary history may have experienced several independent hybridization events over time in different zones of overlap. In birds, the diverse hybrid populations of the house sparrow (Passer domesticus) and the Spanish sparrow (Passer hispaniolensis) provide a striking example. Throughout their range of sympatry, these two species do not regularly interbreed; however, a stabilized hybrid form (Passer italiae) exists on the Italian Peninsula and on several Mediterranean islands. The spatial distribution pattern on the Eurasian continent strongly contrasts the situation in North Africa, where house sparrows and Spanish sparrows occur in close vicinity of phenotypically intermediate populations across a broad mosaic hybrid zone. In this study, we investigate patterns of divergence and admixture among the two parental species, stabilized and nonstabilized hybrid populations in Italy and Algeria based on a mitochondrial marker, a sex chromosomal marker, and 12 microsatellite loci. In Algeria, despite strong spatial and temporal separation of urban early-breeding house sparrows and hybrids and rural late-breeding Spanish sparrows, we found strong genetic admixture of mitochondrial and nuclear markers across all study populations and phenotypes. That pattern of admixture in the North African hybrid zone is strikingly different from i) the Iberian area of sympatry where we observed only weak asymmetrical introgression of Spanish sparrow nuclear alleles into local house sparrow populations and ii) the very homogenous Italian sparrow population where the mitogenome of one parent (P. domesticus) and the Z-chromosomal marker of the other parent (P. hispaniolensis) are fixed. The North African sparrow hybrids provide a further example of enhanced hybridization along with recent urbanization and anthropogenic land-use changes in a mosaic landscape.
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Affiliation(s)
- Martin Päckert
- Senckenberg Naturhistorische Sammlungen Dresden, Senckenberg|Leibniz Institution for Biodiversity and Earth System ResearchDresdenGermany
| | - Abdelkrim Ait Belkacem
- Laboratoire d'Exploration et de Valorisation des Écosystèmes SteppiquesFaculté des Sciences de la nature et de la vieUniversité de DjelfaDjelfaAlgeria
| | - Hannes Wolfgramm
- Senckenberg Naturhistorische Sammlungen Dresden, Senckenberg|Leibniz Institution for Biodiversity and Earth System ResearchDresdenGermany
| | - Oliver Gast
- Institute of Vertebrate Biology Brno & Masaryk University BrnoBrnoCzech Republic
| | - David Canal
- Department of Evolutionary EcologyEstación Biológica de Doñana—CSICSevilleSpain
- Centro para el Estudio y Conservación de las Aves Rapaces en Argentina (CECARA‐UNLPam) & Instituto de las Ciencias de la Tierra y Ambientales de La Pampa (INCITAP)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Santa RosaArgentina
| | | | - Mario Lo Valvo
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e FarmaceuticheUniversità degli Studi di PalermoPalermoItaly
| | - Melita Vamberger
- Senckenberg Naturhistorische Sammlungen Dresden, Senckenberg|Leibniz Institution for Biodiversity and Earth System ResearchDresdenGermany
| | - Michael Wink
- Department of BiologyInstitute of Pharmacy and Molecular BiotechnologyHeidelberg UniversityHeidelbergGermany
| | - Jochen Martens
- Institute of Organismic and Molecular EvolutionJohannes Gutenberg UniversityMainzGermany
| | - Heiko Stuckas
- Senckenberg Naturhistorische Sammlungen Dresden, Senckenberg|Leibniz Institution for Biodiversity and Earth System ResearchDresdenGermany
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10
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Wang S, Rohwer S, Delmore K, Irwin DE. Cross-decades stability of an avian hybrid zone. J Evol Biol 2019; 32:1242-1251. [PMID: 31430391 DOI: 10.1111/jeb.13524] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 08/06/2019] [Accepted: 08/13/2019] [Indexed: 01/04/2023]
Abstract
Hybrid zones are particularly valuable for understanding the evolution of partial reproductive isolation between differentiated populations. An increasing number of hybrid zones have been inferred to move over time, but in most such cases zone movement has not been tested with long-term genomic data. The hybrid zone between Townsend's Warblers (Setophaga townsendi) and Hermit Warblers (S. occidentalis) in the Washington Cascades was previously inferred to be moving from northern S. townsendi southwards towards S. occidentalis, based on plumage and behavioural patterns as well as a 2000-km genetic wake of hermit mitochondrial DNA (mtDNA) in coastal Townsend's Warblers. We directly tested whether hybrid zone position has changed over 2-3 decades by tracking plumage, mtDNA and nuclear genomic variation across the hybrid zone over two sampling periods (1987-94 and 2015-16). Surprisingly, there was no significant movement in genomic or plumage cline centres between the two time periods. Plumage cline widths were narrower than expected by neutral diffusion, consistent with a 'tension zone' model, in which selection against hybrids is balanced by movement of parental forms into the zone. Our results indicate that this hybrid zone is either stable in its location or moving at a rate that is not detectable over 2-3 decades. Despite considerable gene flow, the stable clines in multiple phenotypic and genotypic characters over decades suggest evolutionary stability of this young pair of sister species, allowing divergence to continue. We propose a novel biogeographic scenario to explain these patterns: rather than the hybrid zone having moved thousands of kilometres to its current position, inland Townsend's met coastal Hermit Warbler populations along a broad front of the British Columbia and Alaska coast and hybridization led to replacement of the Hermit Warbler plumage with Townsend's Warbler plumage patterns along this coastline. Hence, hybrid zones along British Columbia and Alaska moved only a short distance from the inland to the coast, whereas the Hermit Warbler phenotype appears stable in Washington and further south. This case provides an example of the complex biogeographic processes that have led to the distribution of current phenotypes within and among closely related species.
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Affiliation(s)
- Silu Wang
- Department of Zoology, University of British Columbia, Vancouver, BC, Canada
| | - Sievert Rohwer
- Department of Biology and Burke Museum, University of Washington, Seattle, WA, USA
| | - Kira Delmore
- Department of Biology, Texas A & M, College Station, TX, USA
| | - Darren E Irwin
- Department of Zoology, University of British Columbia, Vancouver, BC, Canada
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11
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Tominaga A, Matsui M, Yoshikawa N, Eto K, Nishikawa K. Genomic Displacement and Shift of the Hybrid Zone in the Japanese Fire-Bellied Newt. J Hered 2017; 109:232-242. [DOI: 10.1093/jhered/esx085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 09/29/2017] [Indexed: 12/25/2022] Open
Affiliation(s)
- Atsushi Tominaga
- Department of Natural Sciences, Faculty of Education, University of the Ryukyus, Nishihara, Okinawa, Japan
| | - Masafumi Matsui
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu, Sakyo, Kyoto, Japan
| | - Natsuhiko Yoshikawa
- Center for Molecular Biodiversity Research, National Museum of Nature and Science, Tsukuba, Ibaraki, Japan
| | - Koshiro Eto
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu, Sakyo, Kyoto, Japan
- Kitakyushu Museum of Natural History and Human History, Higashida, Yahatahigashiku, Kitakyushu, Fukuoka, Japan
| | - Kanto Nishikawa
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu, Sakyo, Kyoto, Japan
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12
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Bariotakis M, Koutroumpa K, Karousou R, Pirintsos SA. Environmental (in)dependence of a hybrid zone: Insights from molecular markers and ecological niche modeling in a hybrid zone of Origanum (Lamiaceae) on the island of Crete. Ecol Evol 2016; 6:8727-8739. [PMID: 28035264 PMCID: PMC5192822 DOI: 10.1002/ece3.2560] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 09/13/2016] [Accepted: 09/22/2016] [Indexed: 01/19/2023] Open
Abstract
The role of environment and the relative significance of endogenous versus exogenous selection in shaping hybrid zones have been crucial issues in the studies of hybridization. Recent advances in ecological niche modeling (ENM) offer new methodological tools, especially in combination with the genotyping of individuals in the hybrid zone. Here, we study the hybrid zone between the widely known spices Origanum onites and Origanum vulgare ssp. hirtum in Crete. We analyze the genetic structure of both parental taxa and their hybrid Origanum × intercendens using AFLP markers on 15 sympatric and 12 allopatric populations and employ ecological niche modeling and niche similarity tests to study their niche patterns. We complement these analyses with seed viability measurements. Our study revealed that the hybridizing taxa O. onites and O. vulgare ssp. hirtum and the resulting genotypic classes showed geographical and environmental niche similarities based on the predictions of ENMs and the subsequent similarity tests. The occurrence of the hybrid zone is not directly dependent on environmental factors which favor the fitness of the hybrid compared to the parental taxa, but rather on aspects such as historical factors and management practices, which may contribute to the localization and maintenance of the contact zone between parental species. Our results suggest that if a minimum required niche differentiation between genotypic classes is not achieved, environmental dependence might not have a prominent role on the outcome of the hybridization.
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Affiliation(s)
| | - Konstantina Koutroumpa
- Department of Biology University of Crete Heraklion Greece; Present address: Department of Systematic and Evolutionary Botany University of Zürich Zürich Switzerland
| | - Regina Karousou
- School of Biology Aristotle University of Thessaloniki Thessaloniki Greece
| | - Stergios A Pirintsos
- Department of Biology University of Crete Heraklion Greece; Botanical Garden University of Crete Rethymnon Greece
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13
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Schaefer J, Duvernell D, Campbell DC. Hybridization and introgression in two ecologically dissimilarFundulushybrid zones. Evolution 2016; 70:1051-63. [DOI: 10.1111/evo.12920] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 03/25/2016] [Accepted: 03/26/2016] [Indexed: 02/01/2023]
Affiliation(s)
- Jacob Schaefer
- Department of Biological Sciences; The University of Southern Mississippi; Hattiesburg Mississippi 39406
| | - David Duvernell
- Department of Biological Sciences; Southern Illinois University Edwardsville; Edwardsville Illinois 62026
| | - Dave Cooper Campbell
- Department of Biological Sciences; The University of Southern Mississippi; Hattiesburg Mississippi 39406
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