Effect of Increased Atmospheric Nitrogen Deposition and Elevated CO2 on Traits Responsible for Carnivory in the Sundews Drosera rotundifolia and Drosera intermedia Senior Honors Thesis by Chloe White Program
نویسنده
چکیده
Two experiments were conducted to study the effects of increased atmospheric nitrogen deposition and elevated CO2 on investment in carnivory by two sundew species, Drosera rotundifolia and D. intermedia. A field study was conducted with D. rotundifolia at Inverness Mud Lake Bog in Inverness Twp., MI where plants were exposed to simulated future increases in atmospheric nitrogen deposition predicted under the IPCC B1 and A1FI emissions scenarios. A second study was conducted with D. intermedia using an array of 40 open-topped CO2 chambers. Plants were exposed to ambient or elevated CO2 with or without simulated A1FI atmospheric nitrogen deposition. ANOVA did not detect a significant treatment effect for any measured prey-capture trait (percent redness, trichome number, and leaf stickiness). However, paired comparisons within treatments suggested that both sundew species alter investment in at least one prey-capture trait in response to increased nitrogen and/or carbon availability. Drosera rotundifolia decreased investment in red tissue and trichomes in response to B1 and A1FI nitrogen addition, respectively. When grown under elevated CO2, D. intermedia displayed a larger increase in redness and produced more sticky dew than when grown under ambient CO2. Therefore, D. rotundifolia and D. intermedia appear capable of adjusting investment in preycapture traits in response to increasing levels of atmospheric carbon and nitrogen, though this ability is far from complete, and will likely be species-specific.
منابع مشابه
The contribution of insect prey to the total nitrogen content of sundews ( Drosera spp.) determined in situ by stable isotope analysis
• The contribution of insect prey to total N in the carnivorous plants, Drosera rotundifolia and D. intermedia , was quantified in situ and without any experimental manipulation using natural abundance stable isotope analysis. • Samples of D. rotundifolia and D. intermedia , insects and noncarnivorous reference plants were collected from three contrasting locations across Britain. The proportio...
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