...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecological research >A test of the latitudinal defense hypothesis: herbivory, tannins and total phenolics in four North American tree species
【24h】

A test of the latitudinal defense hypothesis: herbivory, tannins and total phenolics in four North American tree species

机译：纬向防御假设的检验：四种北美树种的食草，单宁和总酚

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

It is widely believed that insect herbivory is less intense at higher latitudes, due to winter mortality which would tend to keep insect herbivores from reaching density-limitation of their populations. One prediction of this theory is that plants should tend to be better defended at lower latitudes. Here we investigated latitudinal trends in herbivory and tannins, in four species of common North American trees. Our comparisons spanned 15° of latitude in Acer rubrum, Fagus gramdi-folia, and Quercus alba, and 10° latitude in Liquidambar styracifluu. Sun leaves on forest edges were sampled, at phenologically equivalent times of year. Analysis revealed significant differences between populations, including those at similar latitudes, but no significant latitudinal trend in herbivory, condensed and hydro-lyzable tannins, or total phenolics measured as Folin Denis reactives in any of the four species. Our findings contradict the theory that low latitude plants are better defended, in that lower latitude populations of the four tree species showed no greater amounts of phenolics. The possible implications for community ecology are discussed.
机译：人们普遍认为，由于冬季死亡率高，昆虫食草在高纬度地区的强度较低，这往往会使昆虫食草动物无法达到其种群的密度极限。这种理论的一个预测是，在低纬度地区，植物应倾向于得到更好的保护。在这里，我们调查了北美四种常见树种中草食性和单宁性的纬度趋势。我们的比较涵盖了宏cer，枫豆和白栎中的纬度为15°，而枫香中的纬度为10°。在每年的物候上等价的时间里，对森林边缘的太阳叶进行采样。分析显示，种群之间存在显着差异，包括在相似纬度的种群，但在这四个物种中，草食性，缩合单宁和可水解单宁或总酚含量（以Folin Denis反应性衡量）均无明显纬度趋势。我们的发现与低纬度植物得到更好保护的理论相抵触，因为四种树种的低纬度种群没有显示出更多的酚类物质。讨论了对社区生态的可能含义。

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