We give lattice path proofs of determinantal formulas for orthosymplectic characters. We use the spo(2m, n)-tableaux introduced by Benkart, Shader and Ram, which have both a semistandard symplectic part and a row-strict part. We obtain orthosymplectic Jacobi-Trudi identities and an orthosymplectic Giambelli identity by associating spo(2m, n)-tableaux to certain families of nonintersecting lattice paths and using an adaptation of the Gessel-Viennot method. (C) 2016 Elsevier Ltd. All rights reserved.
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