...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Conservation Biology >Effects of Alien Plants on Insect Abundance and Biomass: a Food-Web Approach
【24h】

Effects of Alien Plants on Insect Abundance and Biomass: a Food-Web Approach

机译：外来植物对昆虫丰度和生物量的影响：一种食物网方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The replacement of native plants by alien species is likely to affect other trophic levels, particularly phytophagous insects. Nevertheless, the effect of alien plants on insect biomass has not yet been quantified. Given their critical role in transferring energy from plants to higher trophic levels, if alien plants do affect insect biomass, this could have far-reaching consequences for community structure. We used 35 food webs to evaluate the impacts of alien plants on insect productivity in a native forest in the Azores. Our food webs quantified plants, insect herbivores, and their parasitoids, which allowed us to test the effects of alien plants on species richness and evenness, insect abundance, insect biomass, and food-web structure. Species richness of plants and insects, along with plant species evenness, declined as the level of plant invasion increased. Nevertheless, none of the 4 quantitative food-web descriptors (number of links, link density, connectance, and interaction evenness) varied significantly with plant invasion independent of the size of the food web. Overall, insect abundance was not significantly affected by alien plants, but insect biomass was significantly reduced. This effect was due to the replacement of large insects on native plants with small insects on alien plants. Furthermore, the impact of alien plants was sufficiently severe to invert the otherwise expected pattern of species-richness decline with increased elevation. We predict a decrease in insect productivity by over 67% if conservation efforts fail to halt the invasion of alien plants in the Azores.
机译：外来物种取代本地植物可能会影响其他营养水平，尤其是食植物昆虫。然而，尚未量化外来植物对昆虫生物量的影响。考虑到它们在将能量从植物转移到更高营养水平方面的关键作用，如果外来植物确实影响昆虫的生物量，这可能会对社区结构产生深远的影响。我们使用35个食物网评估了亚速尔群岛原生林中外来植物对昆虫生产力的影响。我们的食物网对植物，昆虫食草动物及其寄生虫进行了量化，这使我们能够测试外来植物对物种丰富度和均匀度，昆虫丰度，昆虫生物量以及食物网结构的影响。随着植物入侵水平的提高，植物和昆虫的物种丰富度以及植物物种的均匀度下降。然而，四种定量的食物网描述符（链接数，链接密度，连通性和交互均匀度）均不会随植物入侵而显着变化，而与食物网的大小无关。总体而言，外来植物对昆虫的丰度没有显着影响，但昆虫的生物量却显着减少。这种效果是由于用外来植物上的小昆虫代替了天然植物上的大昆虫。此外，外来植物的影响非常严重，以至于反过来会反过来提高海拔，否则会导致物种丰富度下降的预期模式。我们预测，如果保护工作未能阻止亚速尔群岛外来植物的入侵，昆虫的生产力将降低67％以上。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号