Changes in western wheatgrass foliage quality following defoliation: consequences for a graminivorous grasshopper.
作者： R. A. Redak , J. L. Capinera
DOI: 10.1007/BF00317133
关键词:
摘要: We determined the effects of defoliation by a graminivorous grasshopper on foliage quality C3 plant, western wheatgrass (Pascopyrum smithii [Rydb] A. Love). Additionally, we this upon subsequent feeding Phoetaliotes nebrascensis Thomas (Orthoptera: Acrididae). In field and greenhouse studies, herbivory altered remaining foliage. greenhouse, severe (50% removal) grazing (638 grasshoppers/m2 for 72h) resulted in decreased foliar nitrogen (-12%), carbohydrate (-11%) water (-2.5%) concentrations, increased phenolic concentrations (+43%). These changes were associated with adult female mass gain, consumption rate, approximate digestibility, food conversion efficiencies. field, moderate (14% (20 20 days) led to 10% reduction concentrations. Foliage not any reductions rates, or The results presented here are consistent hypothesis that leads reallocation carbon compounds within plant such P. is reduced.
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