The effect of grazer size manipulation on periphyton communities
The effect of grazer size manipulation on periphyton communities
复制标题
食草动物大小控制对附生生物群落的影响
作者：
A. Cattaneo;J. Kalff
SummaryWe研究了食草动物大小对附生生物量，大小结构和物种组成的影响，通过去除最大的无脊椎动物食草动物种植在沿岸的Memphremagog湖（Que-Vt）的人工水生植物。一系列的围栏越来越细的网格防止殖民化的大型无脊椎动物，但允许在较小的食草动物。寡毛类，摇蚊，枝角类动物有效地取代蜗牛，使总的食草动物生物量在各种治疗是没有显着差异的控制。除了一个例外，藻类生物量，叶绿素a，没有显着不同的治疗。然而，藻类的大小和分类受到影响，因为大型蓝绿色菌落的优势明显与大型食草动物的存在有关。的大小操纵的结果是定性相似的浮游植物群落的大小选择性浮游动物放牧和一般异速生长方程的基础上的模型是一致的。
SummaryWe examined the effect of grazer size on periphyton biomass, size structure, and species compostion by removing the largest invertebrate grazers on artificial macrophytes planted in the littoral of Lake Memphremagog (Que-Vt). A series of exclosures with increasingly fine mesh prevented colonization by large invertebrates but allowed in smaller grazers. Oligochaetes, chironomids, and cladocerans effectively replaced snails so that total grazer biomass in the various treatments was not significantly different from the controls. With one exception, algal biomass, measured as chlorophyll a, did not differ significantly among the various treatments. However algal size and taxonomy were affected because the dominance of large blue-green colonies was apperantly related to the presence of large grazers. The results of the size manipulations were qualitatively similar to those induced in phytoplankton communities by size selective zooplankton grazing and are consistent with models based on general allometric equations.