The Spatial Signature of Introgression After a Biological Invasion With Hybridization
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The accumulation of genome-wide molecular data has emphasized the important role of hybridization in the evolution of many organisms, which may carry introgressed genomic segments resulting from past admixture events with other taxa. Despite a number of examples of hybridization occurring during biological invasions, the resulting spatial patterns of genomic introgression remain poorly understood. Preliminary simulation studies have suggested a heterogeneous spatial level of introgression for invasive taxa after range expansion. We investigated in detail the robustness of this pattern and its persistence over time for both invasive and local organisms. Using spatially explicit simulations, we explored the spatial distribution of introgression across the area of colonization of an invasive taxon hybridizing with a local taxon. The general pattern for neutral loci supported by our results is an increasing introgression of local genes into the invasive taxon with the increase in the distance from the source of the invasion and a decreasing introgression of invasive genes into the local taxon. However, we also show there is some variation in this general trend depending on the scenario investigated. Spatial heterogeneity of introgression within a given taxon is thus an expected neutral pattern in structured populations after a biological invasion with a low to moderate amount of hybridization. We further show that this pattern is consistent with published empirical observations. Using additional simulations, we argue that the spatial pattern of Neanderthal introgression in modern humans, which has been documented to be higher in Asia than in Europe, can be explained by a model of hybridization with Neanderthals in Eurasia during the range expansion of modern humans from Africa. Our results support the view that weak hybridization during range expansion may explain spatially heterogeneous introgression patterns without the need to invoke selection.
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As hunter-gatherers spread over Europe, their Neanderthal introgression levels increased because of a combination of stochastic demographic and migratory processes related to gene dilution and gene surfing, which explain the spatial gradients of Neanderthal ancestry observed in hunter-gatherers.
“According to the expansion hypothesis (19), as HGs spread over Europe, their NE introgression levels increased because of a combination of stochastic demographic and migratory processes related to gene dilution (20, 31, 39) and gene surfing (22, 23), which explain the spatial gradients of NE ancestry observed in HGs (Fig. 5).”
From Past human expansions shaped the spatial pattern of Neanderthal ancestry (2023) · cites this paper as [19]
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredComputational simulations showed that range expansion could explain the difference in Neanderthal ancestry between Europe and East Asia based on contemporary genomic information from the two extreme sides of Eurasia.
“Computational simulations showed that the process of range expansion could explain the difference in NE ancestry between Europe and East Asia based on contemporary genomic information from the two extreme sides of Eurasia (west and east) (19).”
From Past human expansions shaped the spatial pattern of Neanderthal ancestry (2023) · cites this paper as [19]
The analysis does not support the hypothesis that the slightly higher Neanderthal ancestry in East Asia than in western Europe today could be explained by the greater distance to the source of modern human expansion in Asia than in Europe.
“However, our analysis does not support the hypothesis that a slightly higher level of NE ancestry in East Asia than in western Europe today could be explained by the greater distance to the source of the MH expansion in Asia than in Europe (19).”
From Past human expansions shaped the spatial pattern of Neanderthal ancestry (2023) · cites this paper as [19]
During the out-of-Africa expansion, hunter-gatherers accumulated Neanderthal introgression as they expanded.
“During the OOA, HGs accumulated NE introgression as they expanded, in accordance with the range expansion hypothesis (19).”
From Past human expansions shaped the spatial pattern of Neanderthal ancestry (2023) · cites this paper as [19]
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Duvernell, D. D., Westhafer, E., & Schaefer, J. F. (2019) · Journal of Biogeography · doi:10.1111/jbi.13597 · Cited by 13 · see citing works
Encounters with archaic hominins
Mafessoni, F. (2018) · Nature Ecology & Evolution · doi:10.1038/s41559-018-0729-6 · Cited by 7 · see citing works
Models of hybridization during range expansions and their application to recent human evolution
Excoffier, L., Quilodrán, C. S., & Currat, M. (2014) · doi:10.7892/boris.71413 · Cited by 2 · see citing works
Self-citation
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2 of the 94 references couldn’t be matched to a known paper.
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Insights into invasive species from whole‐genome resequencing
North, H. L., McGaughran, A., & Jiggins, C. D. (2021) · Molecular Ecology · doi:10.1111/mec.15999 · Cited by 123 · see citing works
Neinavaie, F., Ibrahim‐Hashim, A., Kramer, A. M., Brown, J. S., & Richards, C. L. (2021) · Frontiers in Ecology and Evolution · doi:10.3389/fevo.2021.681100 · Cited by 22 · see citing works
Arntzen, J. W., Jehle, R., & Wielstra, B. (2021) · Evolutionary Applications · doi:10.1111/eva.13312 · Cited by 18 · see citing works
Shogren, E. H., Sardell, J. M., Muirhead, C. A., Martí, E., Cooper, E., Moyle, R. G., Presgraves, D. C., & Uy, J. A. C. (2024) · PLoS Genetics · doi:10.1371/journal.pgen.1011360 · Cited by 18 · see citing works
Anderson, D., Negishi, Y., Ishiniwa, H., Okuda, K., Hinton, T. G., Toma, R., Nagata, J., Tamate, H. B., & Kaneko, S. (2021) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2021.0874 · Cited by 15 · see citing works
Past human expansions shaped the spatial pattern of Neanderthal ancestry
Quilodrán, C. S., Rio, J., Tsoupas, A., & Currat, M. (2023) · Science Advances · doi:10.1126/sciadv.adg9817 · Cited by 12 · see citing works
Self-citationMidfacial Morphology and Neandertal–Modern Human Interbreeding
Churchill, S. E., Keys, K., & Ross, A. H. (2022) · Biology · doi:10.3390/biology11081163 · Cited by 11 · see citing works
Okamoto, K., Tominaga, A., & Toda, M. (2023) · Biological Journal of the Linnean Society · doi:10.1093/biolinnean/blad092 · Cited by 10 · see citing works
Kryukov, A. P., Goroshko, O., Arkhipov, V. Y., Red’kin, Y. A., Lee, S., Dorda, B. A., Kryukov, K. A., Kapun, M., & Haring, E. (2022) · Organisms Diversity & Evolution · doi:10.1007/s13127-022-00568-6 · Cited by 9 · see citing works
Farnitano, M. C., Karoly, K. M., & Sweigart, A. L. (2025) · PLoS Genetics · doi:10.1371/journal.pgen.1011624 · Cited by 9 · see citing works
Admixture of Holothurian Species in the Hellenic Seas (Eastern Mediterranean) as Revealed by RADseq
Gkafas, G. A., Sarantopoulou, J., Apostologamvrou, C., Antoniadou, C., Exadactylos, A., Fleris, G., & Vafidis, D. (2023) · Sustainability · doi:10.3390/su151511493 · Cited by 9 · see citing works
Genetic traces of hybrid zone movement across a fragmented habitat
Sequeira, F., Arntzen, J. W., van Gulik, D., Hajema, S., Diaz, R. L., Wagt, M., & van Riemsdijk, I. (2022) · Journal of Evolutionary Biology · doi:10.1111/jeb.13982 · Cited by 9 · see citing works
Carnicero, P., Kröll, J., & Schönswetter, P. (2023) · Molecular Phylogenetics and Evolution · doi:10.1016/j.ympev.2023.107703 · Cited by 8 · see citing works
Evaluating Causes of Current Genetic Gradients of Modern Humans of the Iberian Peninsula
Ferreiro, D., Núñez-Estévez, B., Canedo, M., Branco, C., & Arenas, M. (2021) · Genome Biology and Evolution · doi:10.1093/gbe/evab071 · Cited by 7 · see citing works
Rio, J., Quilodrán, C. S., & Currat, M. (2021) · Communications Biology · doi:10.1038/s42003-021-02670-5 · Cited by 7 · see citing works
Self-citationThe colourful journey of the Eurasian Collared Dove Streptopelia decaocto
van Grouw, H. (2022) · Bulletin of the British Ornithologists Club · doi:10.25226/bboc.v142i2.2022.a3 · Cited by 7 · see citing works
Baião, G. C., Schneider, D. I., Miller, W. J., & Klasson, L. (2022) · Molecular Phylogenetics and Evolution · doi:10.1016/j.ympev.2022.107683 · Cited by 7 · see citing works
Arntzen, J. W. (2024) · Bijdragen tot de Dierkunde · doi:10.1163/18759866-bja10067 · Cited by 6 · see citing works
Post, J. R., Ward, H. G. M., Wilson, K. L., Sterling, G., Cantin, A., & Taylor, E. B. (2021) · Conservation Biology · doi:10.1111/cobi.13783 · Cited by 6 · see citing works
Santo, L. N. D., Quilodrán, C. S., & Currat, M. (2023) · Molecular Biology and Evolution · doi:10.1093/molbev/msad252 · Cited by 4 · see citing works
Self-citationMacDonald, K. J., Leroux, S., & Purchase, C. F. (2024) · Ecosphere · doi:10.1002/ecs2.4967 · Cited by 4 · see citing works
Kearns, A. M., Johnston, H., Fenker, J., Nicholls, J. A., Yang, C., Zwick, A., Iova, B., Mason, I. J., Drew, A., & Joseph, L. (2025) · Journal of Biogeography · doi:10.1111/jbi.15141 · Cited by 2 · see citing works
Broccard, N., Silva, N. M., & Currat, M. (2021) · American Journal of Biological Anthropology · doi:10.1002/ajpa.24431 · Cited by 1 · see citing works
Self-citationMacDonald, K. J., Leroux, S., & Purchase, C. F. (2022) · Research Square · doi:10.21203/rs.3.rs-1514165/v1 · Cited by 2 · see citing works
Tracing the Neanderthal–Modern Human hybrid zone using paleogenomic dataPreprint
Santo, L. N. D., Quilodrán, C. S., Cerrito, P., & Currat, M. (2026) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.64898/2026.01.06.697899 · Cited by 1 · see citing works
Self-citationThe population genomics of invasive speciesPreprint
North, H. L., McGaughran, A., & Jiggins, C. D. (2021) · doi:10.22541/au.160968166.65928724/v1
Farnitano, M. C., Karoly, K. M., & Sweigart, A. L. (2024) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/2024.09.18.613726
Ecological and Evolutionary Impacts of Invasive Grasses
Patel, R. P., Patel, K. P., Barot, J., Dodia, P. P., & Makwana, V. M. (2025) · IGI Global eBooks · doi:10.4018/979-8-3693-8724-5.ch001
Tracing Neanderthal ancestry patterns through successive population expansions in EuropePreprint
Tsoupas, A., Quilodrán, C. S., Rio, J., & Currat, M. (2026) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.64898/2026.02.20.706963
Self-citationFarnitano, M. C., Sotola, V. A., & Sweigart, A. L. (2026) · Molecular Ecology · doi:10.1111/mec.70522
Using genomic tools to understand species differentiation and admixture in hares and mice
Marques, J. P. (2022) · theses.fr (ABES) · doi:10.70675/4a9cb331z69c9z4867z8dbezfa019b800e6b
- Authors
- Quilodrán, C. S., Tsoupas, A., & Currat, M.
- Affiliations
- University of Geneva (CH)
- Corresponding author
- Quilodrán, Claudio S.
- Venue
- Frontiers in Ecology and Evolution
- Publisher
- Frontiers Media SA
- Published
- 2020-09-29
- Volume
- 8
- ISSN
- 2296-701X (ISSN-L)
- OpenAlex
- W3090887809
- Cited by
- 31
- References
- 94
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 7 · 2021: 9
- FWCI
- 3.08
- Type
- journal article
- Language
- en
- Update notices
- corrigendum (2021-05-28)
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Ecology and Evolution (publishedVersion, cc-by)
- Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (31003A_182577)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
- Keywords
- introgression, hybridization, biological invasions, range expansion, Neanderthal introgression, modern human evolution, spatially explicit simulation, admixture, structured populations, neutral loci
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
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