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Food selection in Microtus arvalis: the role of plant functional traits

机译：田鼠的食物选择：植物功能性状的作用

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摘要

We offered captive common voles (Microtus arvalis) a choice of ] 1 plant species (representing four ecological groups) growing in vivaria. Selection was evaluated by measuring (1) the biomass of each plant species consumed and (2) functional and life-history plant traits. The legume Trifolium pratense, known for its high nutrient level, and well accessible rosette forbs creating the highest biomass at the soil ground level, were mostly preferred. Voles avoided mainly grasses and the creeping forb Thymus pulegioides. The experiment showed that foraging was strongly plant species-specific. We assessed whether plant functional traits explain selective foraging in common voles. To explore this, we reanalyzed Holisova's (1959) data about common vole stomach contents and plant trait databases. Regression tree analysis indicated that plant guild and life span were the best predictors of dietary selection, with a probability exceeding 0.5 that voles would eat more grasses and/or legumes than forbs. These results do not correspond with the feeding trial. We suggest that the voles usually consume grasses in the field because grasses are abundant and readily available, but prefer protein-rich forbs when possible.
机译：我们为圈养的普通田鼠（田鼠（Microtus arvalis））提供了一种在vivaria中生长的1种植物物种（代表四个生态群）的选择。通过测量（1）消耗的每种植物的生物量以及（2）功能和生活史植物性状来评估选择。最受青睐的是豆科植物三叶草（Trifolium pratense），其营养水平高，并且容易接近的莲座丛在土壤地面上产生了最高的生物量。田鼠主要避免草和爬行的胸腺pulegioides。实验表明，觅食具有强烈的植物特异性。我们评估了植物功能性状是否可以解释普通田鼠的选择性觅食。为了探索这一点，我们重新分析了Holisova（1959）关于常见田鼠胃内容物和植物性状数据库的数据。回归树分析表明，植物行会和寿命是饮食选择的最佳预测指标，田鼠吃草和/或豆类植物的可能性要高于草类，可能超过0.5。这些结果与喂养试验不符。我们建议田鼠通常在田间消耗草，因为草丰富且容易获得，但在可能的情况下更喜欢富含蛋白质的草。

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