https://www.barkerlab.net/home daily 1.0 2025-08-01 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1552076855672-PM26G79DYAAX7T7Z561D/00000IMG_00000_BURST20181207123629686_COVER.jpg Home - People https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551977651933-RARKRZFV4668PYUVMUU2/1_qkOZ_RVjkDyR-GKpeGHvCA.png Home - Code https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1552077204307-97A94A1LZ9TFK2T9YA1M/phlebodium.png Home - Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551990335355-A491O6BU4Q0SERIPGMVA/__Fig.+5+V2+circosA.png Home - Research https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551977430263-UDWTPXPGMJ2A5QRHTZ52/1_kUBsYLxASwBv19p6eFBncQ.jpeg Home - Courses https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551976420477-S62G3XBZ7OUKQWP88BDP/IMG_20190203_170945.jpg Home - Study Systems https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1620349412526-5FH3UIH7DATAFMEDKMFQ/Screenshot+2021-05-06+6.01.30+PM.png Home https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551978062036-H5VQDAY5E3XII291HFG5/IMG_20190101_084603.jpg Home https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1620348991695-A50IIYP4IDJR8ASC7M0G/PXL_20201220_222330643_2.jpg Home https://www.barkerlab.net/systems daily 0.75 2025-08-05 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/7837eda3-ac10-4fc5-a2d6-f64dcbeff630/PXL_20230430_182110585.jpg Study Systems - Make it stand out Selaginella arizonica X eremophila hybrid zone at Alamo Canyon in Organ Pipe National Monument. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/0e6e2472-f665-4b33-886a-55cd90f836c9/IMG_1710%281%29.jpg Study Systems - Make it stand out A Dieteria sp. being visited by a skipper in the White Mountains of Arizona. Credit: Geoff Finch https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551994574093-BNC3E7JMF5JSAX00LIG4/brassica.png Study Systems The famous “Triangle of U” hypothesis of relationships among the diploid and allopolyploid species of Brassica. Originally proposed by Woo Jang-choon. Image from wikipedia. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551994306835-MEDG8LI4SYNLCA0PE8H9/1_yqHHcjUqYsitf46WDD3Wtg.jpeg Study Systems The allotetraploid lycophyte Selaginella rupincola growing among the boulders at Cochise Stronghold in the Dragoon Mountains southeast of Tucson, Arizona. Image credit M. S. Barker. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/6f211718-2f06-4d1a-ab1a-6cfbfee5394f/PXL_20220622_171230536.jpg Study Systems - Make it stand out Xanthisma spinulosum growing outside a gym in Tucson, Arizona. https://www.barkerlab.net/contact daily 0.75 2025-08-03 https://www.barkerlab.net/research daily 0.75 2025-08-05 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/757e79cd-5797-45c5-a53b-14c951b99acb/Screenshot+from+2025-08-04+16-14-02.png Research - Make it stand out The number of rounds of WGDs inferred in the history flowering plant species. After McKibben et al. 2024 American Journal of Botany. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551943033744-3P7I0Y2HUFKUZDHGENDD/1_71DR_nJLiFC0utR5Lh_Dcw+%281%29.jpeg Research Comparison of genetic diversity across the paleopolyploid genome of Brassica rapa. Genomic data from more than 100 newly sequenced accessions of B. rapa crops are included in the analysis. These include turnips, field mustards, Chinese cabbage, pak choi, sarsons, and rapini. From Qi et al. 2021 New Phytologist https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/9ff3238f-a3db-481c-ae07-392d54245f16/Screenshot+from+2025-08-04+16-29-46.png Research - Make it stand out The distribution of chromosome numbers among flowering plants, ferns, and animals. After Román-Palacios et al. 2021 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/88be9a3e-e2c7-4ee8-a793-edae522fc078/Screenshot+from+2025-08-04+16-52-49.png Research - Make it stand out Effect of homoeologous exchange rate on the tetraploid site frequency spectrum. High exchange rates eliminate the characteristic 50% frequency peak as alleles mix, causing the SFS to resemble that of an autopolyploid. After Blischak et al. 2023, Genetics https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/b82840fa-be40-4626-a2e2-23781ee613b0/Screenshot+from+2025-08-04+16-25-35.png Research - Make it stand out A riparian plot showing genome evolution across five angiosperm species with different rounds of WGD. McKibben and Barker unpublished. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/db90b67d-04df-47bd-b656-9b5ee2fb4d8a/Screenshot+from+2025-08-04+16-56-53.png Research - Make it stand out Climatic niche overlap between an allopolyploid and its diploid progenitors. Grey shading shows species occurrence density; contour lines indicate 100% (solid) and 50% (dashed) of available environmental space. This example shows an allopolyploid with less climatic overlap with both parents than the parents share with each other. After Baniaga et al. 2020, Ecology Letters https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/03aaecdb-21cb-4792-b56e-50b3cd3803b5/Screenshot+from+2025-08-04+17-02-04.png Research - Make it stand out Comparison of nucleotide diversity (p) across Brassica rapa paleologs and non-paleologs. After Qi et al. 2021, New Phytologist https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551943365603-MA0634ITE7Y99GIXEW8O/1_Fyk35GjYGZSXMpH7qe9fpA.png Research Simulation analyses of the diversification of diploid and polyploid lineages with independent speciation and extinction rates. From Arrigo & Barker 2012. https://www.barkerlab.net/publications daily 0.75 2025-08-05 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1572914028746-XYVCADN30NN32A6XX00L/Screenshot+2019-11-04+at+5.28.17+PM.png Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551996704361-RF4FF64GRKZVN37UP5Q2/1_yYRmE9dSAcge5ANf0JV_pg.jpeg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551996916787-BQ174OFORX2PLKX8KZW1/1_URmhmW1e2D8aQiOwByhtgw.jpeg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551997096433-ZMIOKUFODQC0LUYQH79A/1_0gUPLQhNUqBND7z72oMBwA.jpeg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/ab7484a0-0eea-4bef-8c0e-6852d437b85d/ajb2.16397.fp.png Publications - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551996854933-0341XUNFY6IA2LRMFLL5/1_e7BpM8Zdxtwx7eciENLZlg.jpeg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1572914336658-RXJF8ALC7PMKOXDSRS5J/Screenshot+2019-11-04+at+5.38.30+PM.png Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551997063187-CA3HVOHSRBXBKOANIQR1/1_ch8-akrl_68p9z6NxuAJYw.jpeg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551996057612-4SA8N1XI9YLHQY0UHMFQ/IMG_20190307_145822.jpg Publications https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551996741068-SZJYMFHVP4GSC5YCMF0N/1_5spyjpTCIgUN-YwPg7nZtg.jpeg Publications https://www.barkerlab.net/code daily 0.75 2025-08-03 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551998780521-K85H1IWN1E0PABHLPC92/1_qkOZ_RVjkDyR-GKpeGHvCA.png Code Sample of simulated WGDs used for training machine learning models of WGD inference in forthcoming tool SLEDGE (Sutherland et al. in prep). https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/f1416ce4-7613-4491-ab1a-f8211fff1ab9/Screenshot+from+2025-08-02+17-16-40.png Code - Make it stand out Heat maps of Frackify’s classification accuracy on single, double, and triple retained genes in simulations containing three independent WGDs of varying divergences from each other. After McKibben and Barker 2023. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551998540723-KNCAP01QYXX9PNX1YLIR/1_aCkseNnFgfz80B477oQS7g.png Code https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1551998626177-8G2L9P0HVPHNIRYJA8TV/1_ZC_k0oKAMcp4-5whL5RpCg.png Code Flow chart of the MAPS algorithm (Li et al. 2015) from Li et al. in preparation. https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/f2560b6d-49d6-4e2c-a6a0-9a93e4ab4184/iyad107f6.jpeg Code - Make it stand out Graphical representations of the models used in the Blischak et al. 2023 dadi models for validating the diffusion approximation for autopolyploids (left), segmental allopolyploids (middle), and allopolyploids (right). https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1620346611930-AB7OZPQNNYG2T8QAIH87/Animalia_kingdom.png Code Distribution of animal chromosome counts in the ACC. https://www.barkerlab.net/courses daily 0.75 2020-08-05 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https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1754096680456-BA4XA3X4I5P4496SQUNQ/PXL_20230508_203305082%7E2.jpg People https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/c0a15b81-fcab-4c4b-97c0-ca7f7c696926/PXL_20240126_003408616%7E2%281%29.jpg People - Dr. Michael S. Barker Professor and Associate Department Head, Ecology & Evolutionary Biology Professor, BIO5 Professor, Genetics GIDP Director, Bioinformatics Degree Program Co-Director, CAMBIUM NRT msbarker@arizona.edu Phone: 520–621–2213 Office: BioSciences West 321E Lab: BioSciences West 321 EEB Department Page @barkerms.bsky.social on Bluesky https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/a19c7312-85d4-4ec4-baf6-55adb1c4778c/PXL_20250715_044304973.NIGHT%7E2.jpg People - Dr. Tamsen Dunn NSF PRFB Postdoctoral Fellow, January 2026 Developing computational approaches to study the evolution of polyploid genomes https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/f3f7571c-6082-4bdd-b737-f3bb00ca4e91/Seongyeon_20220413.jpg People - Seongyeon Kang EEB Ph.D. Student Exploring chromosomal evolution in flowering plants https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1620236797214-PL06GIZI8Q0MCNX3IAP2/IMG_20191212_165540.jpg People - Geoff Finch EEB Ph.D. Candidate Analyzing the population genetic consequences of chromosome number evolution with a focus on the exceptional genus Xanthisma https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/0094ba8e-c387-4b75-bdf1-c5b76dd08e25/IMG_1147.jpg People - Alex Stewart EEB PhD Student NSF GRFP Fellow Studying polyploid speciation and genome evolution in salamanders and Selaginella https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/aca5c5ae-8543-4110-a317-ff3f27dbbece/PXL_20250730_191843953%7E3.jpg People Most of the 2025 Barker Lab at Botany 2025 in Palm Springs! https://www.barkerlab.net/polyweb daily 0.75 2025-02-01 https://images.squarespace-cdn.com/content/v1/5c80bf39c46f6d4f62e61fa6/1aeaa78e-4fb2-48ff-ac66-a40c95fbf196/2_5_25+Flyer.png Polyploidy Webinar The next Polyploidy Webinar is on February 5 at 11 AM PST and features talks from Charity Goeckeritz and Christoph Rosche. 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