USE OF MORPHOMETRIC ANALYSIS ON CUBONAVICULAR AND ASTRAGALI TO DIFFERENTIATE BISON SPECIES Ashley Ferguson Department of Geosciences, Idaho State University.

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Presentation transcript:

USE OF MORPHOMETRIC ANALYSIS ON CUBONAVICULAR AND ASTRAGALI TO DIFFERENTIATE BISON SPECIES Ashley Ferguson Department of Geosciences, Idaho State University Mary E. Thompson, Ph.D. Idaho Museum of Natural History/ISU

Introduction Bison species currently identified by skull morphology only. Skulls do not preserve well. Several species of bison are found in one area. Can astragali and/or cubonaviculars be used to differentiate bison species? Pinsof, 1991 Journal of Vertebrate Paleontology

Material Astragali Wasden: 90 Pleistocene Bison: 12 Bison latifrons: 29 Odocoileus: 8 Antilocapra: 12 Bison: 6 Ovis: 12 Cubonaviculars Wasden: 83 Pleistocene Bison: 21 Bison latifrons: 27 Odocoileus: 4 Antilocapra: 9 Bison: 5 Ovis: 10 American Falls, Idaho – Pleistocene Wasden, Owl Cave, Idaho – 8000 BP Modern Osteological material: Antilocapra Bison Ovis Odocoileus 5 cm

Standard Biometric Analysis GLl = Greatest Length Lateral GLm = Greatest Length Medial Dl = Greatest Depth Lateral Dm = Greatest Depth Medial GB = Greatest Breadth (distal end)

Results: Astragali (Standard Measurements)

Results: Cubonavicular (Standard Measurements) 62001/ / /26412

Results: Standard Measurements Very conservative across all measurements. Five outliers, may be identified incorrectly. Possibility of overlap by juveniles or sexual dimorphism? Does the Morphometric data match?

Landmark Analysis Type 2 Landmarks Inflection points on convex or concave curves. Picked homologous structures that are visible on all specimens. Procrustes Fit Removes information not about shape. Covariance Matrix Generalizes variance to multiple dimensions. Principle Component Analysis (PCA) Projects as much variation as possible and plots them into a few dimensions.

Results: Astragali (Morphometric Analysis) Left AstragaliRight Astragali

Results: Astragali (Morphometric Analysis) Left Astragali 65003/ / /1481 Right Astragali

Results: Cubonavicular (Morphometric Analysis) Left Cubonavicular Right Cubonavicular

Results: Cubonavicular (Morphometric Analysis) Left Cubonavicular 62001/ / /26415 Right Cubonavicular

Conclusions Family level Distinguishable with astragali, more clearly on the left side than the right. Genus level Some separation of Ovis, Bison, and Odocoileus on the left side with overlap. Species level Some separation of B. latifrons and the Wasden material. Cubonaviculars are ineffective for identification at the family, genus, or species level.

Future Research Include Camelops material into the astragali measurments and morphometrics. Integrate known B. antiquus, B. priscus, B. alaskensis and B. latifrons into morphometric analysis to narrow down groupings.

Things to Consider… What could be occurring in Wasden? Could other post-cranial material be more successful? What effects does right- hoofed vs. left-hoofed have on morphometric data? How do juveniles or sexual dimorphism play a role?

Acknowledgements Idaho Museum of Natural History Amber Tews – Wasden Material Earth Sciences Divison – Paleo and Comparative Osteo. Department of the Interior, Bureau of Reclamation