Net Effects of Rising CO2 on the Performance of Plants and Their Insect Herbivores

BazzazDEB 9903808浓缩的二氧化碳对植物的直接影响正变得越来越为人所知。然而，在二氧化碳浓度升高的情况下，以这些植物为食的植物和昆虫之间的相互作用还没有被很好地理解。这项研究提出了三个问题，即在高二氧化碳大气中植物昆虫相互作用的变化如何影响种群和群落，使用来自不同取食协会的昆虫物种饲养整个植物。第一个实验将确定来自不同取食协会的昆虫对单一寄主植物在高二氧化碳下生长的反应。在第二个实验中，将使用氮气和二氧化碳处理来详细研究这些环境因素对植物和昆虫表现的交互影响。这项研究中提出的最后一个实验将研究改变草食动物偏好对多物种寄主植物组合内植物竞争相互作用的潜在影响。这将极大地扩展我们的知识，了解不同昆虫对高二氧化碳下寄主植物质量变化的取食反应将如何影响食草动物和植物的表现。这项研究的组成部分将为高二氧化碳大气如何影响个体、种群和群落层面的昆虫-植物相互作用提供重要的见解。

BazzazDEB 9903808The direct effects of enriched CO2 on plants are becoming increasingly well known. However, how the interactions of plant and insects that feed on those plants under elevated CO2 is not very well understood. This study proposes to address three questions about how populations and communities may be affected by changes in plant insect interactions in high CO2 atmospheres, using insect species from different feeding guilds reared on whole plants. The first experiment will determine how insects from different feeding guilds respond to a single host plant grown under elevated CO2. In the second experiment, both Nitrogen and CO2 treatments will be used to examine in detail the interactive effects of these environmental factors on both plant and insect performance. The last experiment proposed in this study would examine the potential effects of altered herbivore preferences on plant competitive interactions within a multi-species host plant assemblage. It will greatly extend our knowledge of how the feeding responses of different insects to changes in host plant quality under high CO2 will affect both herbivore and plant performance. The components of this research will provide important insight into how elevated CO2 atmospheres will affect insect-plant interactions at the individual, population, and community levels.