Light Levels and Herbivory Partially Explain the Survival, Growth, and Niche Requirements of Streptanthus bracteatus A. Gray (Bracted Twistflower, Brassicaceae), a Rare Central Texas Endemic
作者： Wendy J. Leonard , O.W. Van Auken
DOI: 10.3375/043.033.0306
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摘要: ABSTRACT Streptanthus bracteatus A. Gray, bracted twistflower (Brassicaceae), is a rare, endemic of the Edwards Plateau ecoregion central Texas. We examined effects light levels on growth S. in field experiment and also combined canopy (+/-) exclosure (+/-, herbivory) 2 × factorial experiment. Plants high had significantly greater compared to plants low treatments. For most variables, were negatively affected by herbivory (likely white-tailed deer, Odocoileus virginianus) presence woodland with significant interactions between (+/exclosure) treatments (+/-). Survival was 100% exclosures 58% when unprotected. protected from open greatest basal diameter, height, aboveground, belowground, total dry mass, while those not much lower responses. Pl...
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