Articles in Refereed Journals

TEAL Lab Members are highlighted in bold


  • Hyland C, Scott MB, Routledge J, Szpak P, 2021. Stable Carbon and Nitrogen Isotope Variability of Bone Collagen to Determine the Number of Isotopically Distinct Specimens. Journal of Archaeological Method and Theory. doi:10.1007/s10816-021-09533-7. [DOWNLOAD .pdf]

  • Hyland C, Millaire J-F, Szpak P, 2021. Migration and maize in the Virú Valley: Understanding life histories through multi-tissue carbon, nitrogen, sulfur, and strontium isotope analyses. American Journal of Physical Anthropology. doi:10.1002/ajpa.24271. [DOWNLOAD .pdf]

  • Cheung C, Szpak P, 2021. Interpreting Past Human Diets Using Stable Isotope Mixing Models—Best Practices for Data Acquisition. Journal of Archaeological Method and Theory. doi:10.1007/s10816-021-09514-w. [DOWNLOAD .pdf]

  • Guiry EJ, Kennedy JR, O’Connell MT, Gray DR, Grant C, Szpak P, 2021. Early evidence for historical overfishing in the Gulf of Mexico. Science Advances 7, eabh2525. doi:10.1126/sciadv.abh2525. [DOWNLOAD .pdf]

  • Guiry E, Orchard TJ, Needs-Howarth S, Szpak P, 2021. Isotopic Evidence for Garden Hunting and Resource Depression in the Late Woodland of Northeastern North America. American Antiquity 86, 90-110. doi:10.1017/aaq.2020.86. [DOWNLOAD .pdf]

  • Guiry EJ, Szpak P, 2021. Improved quality control criteria for stable carbon and nitrogen isotope measurements of ancient bone collagen. Journal of Archaeological Science 132, 105416. doi:10.1016/j.jas.2021.105416.[DOWNLOAD .pdf]

  • Keighley X, Bro-Jørgensen MH, Ahlgren H, Szpak P, Ciucani MM, Sánchez Barreiro F, Howse L, Gotfredsen AB, Glykou A, Jordan P, Lidén K, Tange Olsen M, 2021. Predicting sample success for large-scale ancient DNA studies on marine mammals. Molecular Ecology Resources doi:10.1111/1755-0998.13331. [DOWNLOAD .pdf]

  • Louis M, Skovrind M, Garde E, Heide-Jørgensen MP, Szpak P, Lorenzen ED. 2021. Population-specific sex and size variation in long-term foraging ecology of belugas and narwhals. Royal Society Open Science 7, 202226. doi: 10.1098/rsos.202226. [DOWNLOAD .pdf]

  • McCormack J, Szpak P, Bourgon N, Richards M, Hyland C, Méjean P, Hublin J-J, Jaouen K, 2021. Zinc isotopes from archaeological bones provide reliable tropic level information for marine mammals. Communications Biology 4, 683. doi:10.1038/s42003-021-02212-z. [DOWNLOAD .pdf]

  • Rey-Iglesia A, Lister AM, Stuart AJ, Bocherens H, Szpak P, Willerslev E, Lorenzen ED, 2021. Late Pleistocene paleoecology and phylogeography of woolly rhinoceroses. Quaternary Science Reviews 263, 106993. doi:10.1016/j.quascirev.2021.106993. [DOWNLOAD .pdf]



  • Szpak P, Buckley M, 2020. Sulfur isotopes (δ34S) in Arctic marine mammals: indicators of benthic vs. pelagic foraging. Marine Ecology Progress Series 653, 205-216. doi:10.3354/meps13493. [DOWNLOAD .pdf]

  • Szpak P, Chiou KL, 2020. A comparison of nitrogen isotope compositions of charred and desiccated botanical remains from northern Peru. Vegetation History and Archaeobotany 29, 527-538. doi:10.1007/s00334-019-00761-2.[DOWNLOAD .pdf]

  • Szpak P, Millaire J-F, Chapdelaine C, White CD, Longstaffe FJ, 2020. An Integrated isotopic study of Early Intermediate Period camelid husbandry in the Santa Valley, Perú. Environmental Archaeology, 25, 279-295. doi:10.1080/14614103.2019.1583302. [DOWNLOAD .pdf]

  • Szpak P, Valenzuela D, 2020. Camelid husbandry in the Atacama Desert? A stable isotope study of camelid bone collagen and textiles from the Lluta and Camarones Valleys, northern Chile. PLOS One 15, e0228332. doi:10.1371/journal.pone.0228332. [DOWNLOAD .pdf]

  • Szpak P, Julien M-H, Royle TCA, Savelle JM, Yang DY, Richards MP, 2020. Sexual differences in the foraging ecology of 19th century beluga whales (Delphinapterus leucas) from the Canadian High Arctic. Marine Mammal Science 36, 451-471. doi:10.1111/mms.12655. [DOWNLOAD .pdf]

  • Cheung C, Szpak P, 2020. Interpreting Past Human Diets Using Stable Isotope Mixing Models. Journal of Archaeological Method and Theory. doi:10.1007/s10816-020-09492-5. [DOWNLOAD .pdf]

  • Guiry EJ, Buckley M, Orchard TJ, Hawkins AL, Needs-Howarth S, Holm E, Szpak P, 2020. Deforestation caused abrupt shift in Great Lakes nitrogen cycle. Limnology and Oceanography 65, 1921-1935. doi:10.1002/lno.11428. [DOWNLOAD .pdf]

  • Guiry E, Royle TCA, Matson RG, Ward H, Weir T, Waber N, Brown TJ, Hunt BPV, Price MHH, Finney BP, Kaeriyama M, Qin Y, Yang DY, Szpak P. 2020 Differentiating salmonid migratory ecotypes through stable isotope analysis of collagen: Archaeological and ecological applications. PLOS One 15:e0232180. doi: 10.1371/journal.pone.0232180. [DOWNLOAD .pdf]

  • Guiry E, Royle TCA, Orchard TJ, Needs-Howarth S, Yang DY, Szpak P, 2020. Evidence for freshwater residency among Lake Ontario Atlantic salmon (Salmo salar) spawning in New York. Journal of Great Lakes Research. 46, 1036-1043. doi:10.1016/j.jglr.2020.05.009. [DOWNLOAD .pdf]

  • Guiry E, Szpak P, 2020. Quality Control for Modern Bone Collagen Stable Carbon and Nitrogen Isotope Measurements. Methods in Ecology and Evolution 11, 1049-1060. doi:10.1111/2041-210X.13433. [DOWNLOAD .pdf]

  • Guiry E, Szpak P, 2020. Seaweed-eating sheep show that δ34S evidence for marine diets can be fully masked by sea spray effects. Rapid Communications in Mass Spectrometry 34, e8868. doi:10.1002/rcm.8868. [DOWNLOAD .pdf]

  • Losey RJ, Guiry E, Nomokonova T, Gusev AV, Szpak P, 2020. Storing fish?: a dog’s isotopic biography provides insight into Iron Age food preservation strategies in the Russian Arctic. Archaeological and Anthropological Sciences. doi:10.1007/s12520-020-01166-3. [DOWNLOAD .pdf]



  • Szpak P, Longstaffe FJ, Macdonald R, Millaire J-F, White CD, Richards MP, 2019. Plant sulfur isotopic compositions are altered by marine fertilizers. Archaeological and Anthropological Sciences 11, 2989-2999. doi:10.1007/s12520-018-0716-5. [DOWNLOAD .pdf]

  • Szpak P, Savelle JM, Conolly J, Richards MP, 2019. Variation in Late Holocene Marine Environments in the Canadian Arctic Archipelago: Evidence from Ringed Seal Bone Collagen Stable Isotope Compositions. Quaternary Science Reviews 211, 136-155. doi:10.1016/j.quascirev.2019.03.016. [DOWNLOAD .pdf]

  • Delsuc F, Kuch M, Gibb GC, Karpinski E, Hackenberger D, Szpak P, Martínez JG, Mead JI, McDonald HG, MacPhee RDE, Billet G, Hautier L, Poinar HN, 2019. Ancient Mitogenomes Reveal the Evolutionary History and Biogeography of Sloths. Current Biology 29, 2031-2042.e2036. doi:10.1016/j.cub.2019.05.043. [DOWNLOAD .pdf]

  • Dyke AS, Savelle JM, Szpak P, Southon JR, Howse L, Desrosiers PM, Kotar K, 2019. An Assessment of Marine Reservoir Corrections for Radiocarbon Dates on Walrus from the Foxe Basin Region of Arctic Canada. Radiocarbon 61, 67-81. doi:10.1017/RDC.2018.50. [DOWNLOAD .pdf]

  • Rey-Iglesia A, García-Vázquez A, Treadaway EC, van der Plicht J, Baryshnikov GF, Szpak P, Bocherens H, Boeskorov GG, Lorenzen ED, 2019. Evolutionary history and palaeoecology of brown bear in North-East Siberia re-examined using ancient DNA and stable isotopes from skeletal remains. Scientific Reports 9, 4462. doi:10.1038/s41598-019-40168-7. [DOWNLOAD .pdf]

  • Santoro CM, Gayo EM, Capriles JM, Rivadeneira MM, Herrera KA, Mandakovic V, Rallo M, Rech JA, Cases B, Briones L, Olguín L, Valenzuela D, Borrero LA, Ugalde PC, Rothhammer F, Latorre C, Szpak P, 2019. From the Pacific to the tropical forests: Networks of social interaction in the Atacama Desert, Late in the Pleistocene. Chungara Revista de Antropología Chilena 51, 5-25. doi:10.4067/S0717-73562019005000602. [DOWNLOAD .pdf]

  • Skovrind M, Castruita JAS, Haile J, Treadaway EC, Gopalakrishnan S, Westbury MV, Heide-Jørgensen MP, Szpak P, Lorenzen ED, 2019. Hybridization between two high Arctic cetaceans confirmed by genomic analysis. Scientific Reports 9, 7729. doi:10.1038/s41598-019-44038-0. [DOWLOAD .pdf]


  • Szpak P, Buckley M, Darwent CM, Richards MP, 2018. Long-term ecological changes in marine mammals driven by recent warming in northwestern Alaska. Global Change Biology 24, 490-503. doi:10.1111/gcb.13880. [DOWNLOAD .pdf]

  • Szpak P, Millaire JF, White CD, Donnan CB, Longstaffe FJ, 2018. Stable Isotope Sourcing of Wool from Textiles at Pacatnamú. Archaeometry 60, 612-627. doi:10.1111/arcm.12342. [DOWNLOAD .pdf]

  • Craine JM, Elmore AJ, Wang L, Aranibar J, Bauters M, Boeckx P, Crowley BE, Dawes MA, Delzon S, Fajardo A, Fang Y, Fujiyoshi L, Gray A, Guerrieri R, Gundale MJ, Hawke DJ, Hietz P, Jonard M, Kearsley E, Kenzo T, Makarov M, Marañón-Jiménez S, McGlynn TP, McNeil BE, Mosher SG, Nelson DM, Peri PL, Roggy JC, Sanders-DeMott R, Song M, Szpak P, Templer PH, Van der Colff D, Werner C, Xu X, Yang Y, Yu G, Zmudczyńska-Skarbek K, 2018. Isotopic evidence for oligotrophication of terrestrial ecosystems. Nature Ecology & Evolution 2, 1735-1744. doi:10.1038/s41559-018-0694-0. [DOWNLOAD .pdf]

  • Delsuc F, Kuch M, Gibb GC, Hughes J, Szpak P, Southon J, Enk J, Duggan AT, Poinar HN, 2018. Resolving the phylogenetic position of Darwin's extinct ground sloth (Mylodon darwinii) using mitogenomic and nuclear exon data. Proceedings of the Royal Society B: Biological Sciences 285, 20180214. doi:10.1098/rspb.2018.0214. [DOWNLOAD .pdf]

  • Guiry E, Beglane F, Szpak P, Schulting R, McCormick F, Richards MP, 2018. Anthropogenic changes to the Holocene nitrogen cycle in Ireland. Science Advances 4, eaas9383. doi:10.1126/sciadv.aas9383. [DOWNLOAD .pdf]



  • Szpak P, Krippner K, Richards MP, 2017. Effects of Sodium Hydroxide Treatment and Ultrafiltration on the Removal of Humic Contaminants from Archaeological Bone. International Journal of Osteoarchaeology 27, 1070-1077. doi:10.1002/oa.2630. [DOWNLOAD .pdf]

  • Szpak P, Metcalfe JZ, Macdonald RA, 2017. Best Practices for Calibrating and Reporting Stable Isotope Measurements in Archaeology. Journal of Archaeological Science: Reports 13, 609-616. doi:10.1016/j.jasrep.2017.05.007. [DOWNLOAD .pdf] Appendices: [Appendix A] [Appendix B] [Appendix C] [Appendix D] [Appendix E] [Appendix F] [Appendix G]

  • Braje TJ, Rick TC, Szpak P, Newsome SD, McCain JM, Elliott Smith EA, Glassow M, Hamilton SL, 2017. Historical ecology and the conservation of large, hermaphroditic fishes in Pacific Coast kelp forest ecosystems. Science Advances 3, e1601759. doi:10.1126/sciadv.1601759. [DOWNLOAD .pdf] 

  • Guiry E, Szpak P, Richards MP, 2017. Isotopic analyses reveal geographical and socioeconomic patterns in historical domestic animal trade between predominantly wheat- and maize-growing agricultural regions in eastern North America. American Antiquity 82, 341-352. doi:10.1017/aaq.2016.34. [DOWNLOAD .pdf] 

  • Carlson RL, Szpak P, Richards MP, 2017. The Pender Canal Site and Beginnings of the Northwest Coast Cultural System. Canadian Journal Of Archaeology 41, 1-29. [DOWNLOAD.pdf]


  • Szpak P, Chicoine D, Millaire J-F, White CD, Parry R, Longstaffe FJ, 2016. Early Horizon camelid management practices in the Nepeña Valley, north-central coast of Peru. Environmental Archaeology 21, 230-245. doi:10.1179/1749631415y.0000000002. [DOWNLOAD .pdf] 

  • Enk J, Devault A, Widga C, Saunders J, Szpak P, Southon J, Rouillard J-M, Shapiro B, Golding B, Zazula G, Froese D, Fisher D, MacPhee R, Poinar H, 2016. Mammuthus Population Dynamics in Late Pleistocene North America: Divergence, Phylogeography and Introgression. Frontiers in Ecology and Evolution 4, 42. doi:10.3389/fevo.2016.00042. [DOWNLOAD .pdf]

  • Guiry EJ, Needs-Howarth S, Friedland KD, Hawkins AL, Szpak P, Macdonald R, Courtemanche M, Holm E, Richards MP, 2016. Lake Ontario salmon (Salmo salar) were not migratory: A long-standing historical debate solved through stable isotope analysis. Scientific Reports 6, 36249. doi:10.1038/srep36249. [DOWNLOAD .pdf]

  • Guiry EJ, Szpak P, Richards MP, 2016. Effects of lipid extraction and ultrafiltration on stable carbon and nitrogen isotopic compositions of fish bone collagen. Rapid Communications in Mass Spectrometry 30, 1591-1600. doi:10.1002/rcm.7590. [DOWNLOAD .pdf]

  • Jaouen K, Szpak P, Richards MP, 2016. Zinc Isotope Ratios as Indicators of Diet and Trophic Level in Arctic Marine Mammals. PLoS ONE 11, e0152299. doi:10.1371/journal.pone.0152299. [DOWNLOAD .pdf]


  • Szpak P, Millaire J-F, White CD, Lau GF, Surette F, Longstaffe FJ, 2015. Origins of Prehispanic Camelid Wool Textiles from the North and Central Coasts of Peru traced by Carbon and Nitrogen Isotopic Analyses. Current Anthropology 56, 449-459. doi:10.1086 /680873. [DOWNLOAD .pdf]

  • Orchard TJ, Szpak P, 2015. Zooarchaeological and Isotopic Insights into Locally Variable Economic Patterns: A Case Study from Late Holocene Southern Haida Gwaii, British Columbia. BC Studies 187, 107-147. [DOWNLOAD .pdf]


  • Szpak P, 2014. Complexities of Nitrogen Isotope Biogeochemistry in Plant-Soil Systems: Implications for the Study of Ancient Agricultural and Animal Management Practices. Frontiers in Plant Science 5, 288. doi:10.3389/fpls.2014.00288 [DOWNLOAD .pdf]

  • Szpak P, Longstaffe FJ, Millaire J-F, White CD, 2014. Large variation in nitrogen isotopic composition of a fertilized legume. Journal of Archaeological Science 45, 72-79.  doi:10.1016/j.jas.2014.02.007 [DOWNLOAD .pdf]

  • Szpak P, Millaire J-F, White CD, Longstaffe FJ, 2014. Small scale camelid husbandry on the north coast of Peru (Virú Valley): Insight from stable isotope analysis. Journal of Anthropological Archaeology 36, 110-129. doi:10.1016/j.jaa.2014.08.005 [DOWNLOAD .pdf]


  • Szpak P, Orchard TJ, Salomon AK, Gröcke DR, 2013. Regional ecological variability and impact of the maritime fur trade on nearshore ecosystems in southern Haida Gwaii (British Columbia, Canada): evidence from stable isotope analysis of rockfish (Sebastes spp.) bone collagen. Archaeological and Anthropological Sciences 5, 159-182. doi:10.1007/s12520-013-0122-y [DOWNLOAD .pdf]

  • Szpak P, White CD, Longstaffe FJ, Millaire J-F, Vásquez Sánchez VF, 2013. Carbon and Nitrogen Isotopic Survey of Northern Peruvian Plants: Baselines for Paleodietary and Paleoecological Studies. PLoS One 8, e53763. doi:10.1371/journal.pone.0053763 [DOWNLOAD .pdf]


  • Szpak P, Longstaffe FJ, Millaire J-F, White CD, 2012. Stable Isotope Biogeochemistry of Seabird Guano Fertilization: Results from Growth Chamber Studies with Maize (Zea mays). PLoS One 7, e33741. doi:10.1371/journal.pone.0033741 [DOWNLOAD .pdf]

  • Szpak P, Millaire J-F, White CD, Longstaffe FJ, 2012. Influence of seabird guano and camelid dung fertilization on the nitrogen isotopic composition of field-grown maize (Zea mays). Journal of Archaeological Science 39, 3721-3740. doi:10.1016/j.jas.2012.06.035 [DOWNLOAD .pdf]

  • Szpak P, Orchard TJ, McKechnie I, Gröcke DR, 2012. Historical ecology of late Holocene sea otters (Enhydra lutris) from northern British Columbia: isotopic and zooarchaeological perspectives. Journal of Archaeological Science 39, 1553-1571. doi:10.1016/j.jas.2011.12.006 [DOWNLOAD .pdf]


  • Szpak P, 2011. Fish bone chemistry and ultrastructure: implications for taphonomy and stable isotope analysis. Journal of Archaeological Science 38, 3358-3372. doi:10.1016/j.jas.2011.07.022 [DOWNLOAD .pdf]


  • Szpak P, Gröcke DR, Debruyne R, MacPhee RDE, Guthrie RD, Froese D, Zazula GD, Patterson WP, Poinar HN, 2010. Regional differences in bone collagen δ13C and δ15N of Pleistocene mammoths: Implications for paleoecology of the mammoth steppe. Palaeogeography, Palaeoclimatology, Palaeoecology 286, 88-96. doi:10.1016/j.palaeo.2009.12.009. [DOWNLOAD .pdf]


  • Szpak P, Orchard TJ, Gröcke DR, 2009. A Late Holocene vertebrate food web from southern Haida Gwaii (Queen Charlotte Islands, British Columbia). Journal of Archaeological Science 36, 2734-2741. doi:10.1016/j.jas.2009.08.013 [DOWNLOAD .pdf]


  • Debruyne R, Chu G, King CE, Bos K, Kuch M, Schwarz C, Szpak P, Gröcke DR, Matheus P, Zazula G, Guthrie D, Froese D, Buigues B, de Marliave C, Flemming C, Poinar D, Fisher D, Southon J, Tikhonov AN, MacPhee RDE, Poinar HN, 2008. Out of America: ancient DNA evidence for a New World origin of Late Quaternary woolly mammoths. Current Biology 18, 1320-1326. doi:10.1016/j.cub.2008.07.061. [DOWNLOAD .pdf]