EFFECTS OF BIRDS AND RODENTS ON SYNTHETIC TALLGRASS COMMUNITIES
EFFECTS OF BIRDS AND RODENTS ON SYNTHETIC TALLGRASS COMMUNITIES
复制标题
鸟类和啮齿动物对合成高草群落的影响
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Joel s. Brown
中科院分区：
文献类型：
--
作者：
H. Howe;Joel s. Brown
我们使用了鸟类和哺乳动物的围封设计犁过的地面测试的影响granivory和草食性的小脊椎动物的高草草原演替的早期阶段。鸟类的种子捕食和啮齿动物的浏览有主要的和加性的影响。在高密度和低密度种植中，食籽鸟类分别使植物密度降低20%和23%，草生物量降低24%和34%。草甸田鼠没有影响植物数量，但减少杂类草生物量的35%，在高密度种植和57%的低密度种植。在高密度和低密度的地块，分别减少了3%和17%的鸟类物种丰富度，而不影响多样性;选择性浏览两个豆科植物和一个锥花留下的物种数量不受影响，但减少了4%和25%的多样性，通过强调已经突出的物种的优势。鸟类的影响在高密度种植中更为明显，而田鼠的影响在低密度种植中最为明显。结果表明，机会主义的雀和鸽子寻找...
We used a bird and mammal exclosure design on plowed ground to test for the effects of granivory and herbivory by small vertebrates on early stages of tallgrass prairie succession. Seed predation by birds and browsing by rodents had major and additive impacts. In high- and low-density plantings, respectively, seed-eating birds reduced plant densities by 20% and 23% and grass biomass by 24% and 34%. Meadow voles did not affect plant numbers but reduced forb biomass by 35% in high- and 57% in low-density plantings. In high- and low-density plots, respectively, birds reduced species richness by 3% and 17% without influencing diversity; selective browsing by voles on two legumes and one coneflower left species number unaffected but reduced diversity by 4% and 25% by accentuating dominance of already-prominent species. Bird effects were more pronounced in high-density plantings, while vole effects were most pronounced in low-density plantings. Results suggest that opportunistic finches and doves that seek out ...