Coniferyl benzoate in quaking aspen A ruffed grouse feeding deterrent

Quaking aspen (Populus tremuloides Michx.) staminate flower buds and catkins are important food resources for ruffed grouse (Bonasa umbellus); however, ruffed grouse select only certain quaking aspen to feed upon. Earlier studies indicate that the primary difference between quaking aspen that ruffed grouse feed upon and those not used is the level of coniferyl benzoate in the flower buds. Bioassays show that coniferyl benzoate is a feeding deterrent for ruffed grouse; its effect on ruffed grouse after ingestion has not been tested. Possible physiological effects, based on the chemical properties of coniferyl benzoate and its oxidation products, include inhibition of protein digestion, toxic effects, and antiestrogenic effects.