Combine ¼ cup yogurt, ¼ cup celery, 2 tablespoons red onion, 3 tablespoons mayonnaise, 2 tablespoons dill, 1 tablespoon lemon juice, the chopped capers, ¼ teaspoon pepper and ⅛ teaspoon salt in a medium bowl, stir well.
Add drained salmon; stir gently, flaking the salmon into bite-size pieces, just until combined.
Garnish with dill and serve with lemon wedges, if desired.
