The effect of food resources, varying in C/N ratio, lipid and ω3 polyunsaturated fatty acid (ω3-PUFA) content, on the fitness of three Collembola species (the euedaphic Protaphorura fimata, hemiedpahic Folsomia candida and epedaphic Lepidocyrtus violaceus) was investigated. Dietary routing of fatty acids served as an indicator for resource consumption and assimilation. Laboratory feeding experiments were performed with single and mixed diets made from algae, cyanobacteria, fungi, soil bacteria or plant roots and leaves. Collembola exhibited species-specific responses in biomass and survival rate to the diets differing in quality, reflecting adaptations to their soil environment. Generally, wide dietary C/N ratios had a negative impact, with roots especially unfavorable, while the dependence on ω3-PUFAs varied. Mixing diets did mostly result in intermediate results where high-quality resources compensate for low-quality resources, with only mixes of resources favoured by Collembola in the wild showing synergistic positive effects. The results suggest that most resources of soil detritivores, irrespective of green or brown food chain, represent a non-optimal diet, with clear adaptations depending on habitat and the potential to truly exploit any resource mostly exhibited in euedaphic species.

食物资源（C / N比，脂质和ω3多不饱和脂肪酸（ω3-PUFA）含量的变化）对三种Collembola物种（真性原球藻，半假念珠菌Folsomia candida和epedaphic Lepidocyryr violaceus）适应性的影响）进行了调查。脂肪酸的饮食路线可作为资源消耗和同化的指标。用藻类，蓝细菌，真菌，土壤细菌或植物的根和叶制成的单一和混合日粮进行实验室喂养实验。Collembola对不同质量饮食的生物量和存活率表现出物种特异性反应，反映了对土壤环境的适应性。通常，宽的日粮C / N比对根系不利，尤其是根系不利，而对ω3-PUFAs的依赖性却不同。混合饮食确实会产生中间结果，其中高质量的资源补偿劣质的资源，只有Collembola在野外喜欢的资源混合物显示出协同的积极作用。结果表明，大部分土壤有害生物资源，