Trophic interactions in soils as they affect energy and nutrient dynamics. III. Biotic interactions of bacteria, amoebae, and nematodes
Trophic interactions in soils as they affect energy and nutrient dynamics. III. Biotic interactions of bacteria, amoebae, and nematodes
复制标题
土壤中的营养相互作用影响能量和养分动态。
作者：
R. Anderson;E. T. Elliott;J. F. Mcclellan;D. Coleman;C. Cole;H. W. Hunt
在添加或不添加葡萄糖的土壤微观世界中培养细菌（假单胞菌）、变形虫（棘阿米巴）和线虫（Mesodiplogaster）。在 24 天的潜伏期结束时，线虫和变形虫以细菌为食，细菌数量显着减少。在线虫存在下变形虫数量减少，线虫数量相应增加，在添加变形虫和葡萄糖的处理中最高达到 230 条线虫/克土壤。 24 天后，未添加碳的处理中的线虫种群以抗性多尔幼虫为主，表明无法获得食物。尽管添加葡萄糖的处理中幼虫数量较高，但在 24 天实验结束时，幼虫数量仍在增加。变形虫的存在对线虫丰度的影响与添加600μg葡萄糖-C具有相同的程度。
Bacteria (Pseudomonas), amoebae (Acanthamoeba), and nematodes (Mesodiplogaster) were raised in soil microcosms with and without glucose additions. Nematode and amoebal grazing on bacteria significantly reduced bacterial populations by the end of a 24-day incubation period. Amoebal numbers decreased in the presence of nematodes with a corresponding increase in nematode numbers which reached a maximum of 230 nematodes/g of soil in the treatment with amoebae and glucose additions. After 24 days the nematode populations in the treatments without carbon additions were dominated by resistant dauer larvae indicating the unavailability of food. Although larval numbers were high in the treatments with glucose additions, the adult component of the population was still increasing at the end of the 24-day experiment. The effect of the presence of amoebae on nematode abundance was of the same magnitude as addition of 600Μg glucose-C.