Data for making Fig. 4

<b>1.</b><b> </b>Carnivorous plants obtain nutrients from arthropod prey (carnivory) and their environment. However, little is known about the seasonal diet shifts between carnivory vs environment among co-occurring carnivorous plant species. Although studies reporting captured prey species for carnivorous plants are abundant, studies investigating the composition of assimilated prey species in their leaves are scarce. Here, we report spatiotemporal dynamics in carnivory vs environmental nutrient acquisition and compositional analysis of prey species assimilated in carnivorous plants of New England (USA).<b>2.</b><b> </b>We measured the natural abundance stable isotope ratios of aquatic <i>Utricularia inflata </i>(Lentibulariaceae), terrestrial <i>Sarracenia purpurea</i> (Sarraceniaceae), and <i>Drosera intermedia</i> (Droseraceae), and their nutrient sources during their growing season in two oligotrophic ponds in New England (USA). MixSIAR, a Bayesian stable isotope mixing model, was used to estimate the extent of carnivory for each plant species and the composition of prey species assimilated in terrestrial carnivorous plants.<b>3.</b><b> </b>Aquatic <i>U. inflata</i> spatiotemporally acquired more nutrients from carnivory (<i>c.</i> 70 to 100%) than terrestrial species (<i>c.</i> 30% to 60%). <i>Sarracenia purpurea</i> acquired nutrients mainly from Formicidae. The nutrient sources for <i>D. intermedia</i> varied spatiotemporally between arthropod species.<b>4.</b><b> </b>The large contribution of carnivory to the nutrient budget of <i>U. inflata</i> could be due to its lack of roots and high metabolic rate. <i>Sarracenia purpurea</i> and <i>D. intermedia</i> could effectively regulate the nutrient level in their habitat and / or could benefit from dissolved organic nitrogen in the environment. Our findings on prey compositions can be used as the first available prior information for the Bayesian approach in future studies. Understanding the sources of nutrients in carnivorous plants can provide invaluable insight into their ecophysiology and conservation and their fragile wetland ecosystems.

<b>1.</b> 食肉植物（carnivorous plants）可从节肢动物猎物（arthropod prey）与环境中获取营养。但学界对同域分布食肉植物物种间，食肉营养获取与环境营养获取的季节性饮食分化仍知之甚少。尽管已有大量研究报道了食肉植物捕获的猎物物种，但针对其叶片中同化猎物物种组成的相关研究仍较为匮乏。本研究报道了美国新英格兰地区食肉植物的食肉营养获取与环境营养获取的时空动态，以及其体内同化猎物物种的组成分析。
<b>2.</b> 本研究于美国新英格兰地区的两个贫营养池塘（oligotrophic ponds）的生长季内，测定了水生<i>Utricularia inflata</i>（狸藻科 Lentibulariaceae）、陆生<i>Sarracenia purpurea</i>（瓶子草科 Sarraceniaceae）与<i>Drosera intermedia</i>（茅膏菜科 Droseraceae）的自然丰度稳定同位素比值（stable isotope ratios），并同步测定了其营养源的同位素特征。本研究采用贝叶斯稳定同位素混合模型（MixSIAR，Bayesian stable isotope mixing model），估算了各植物物种的食肉营养获取占比，以及陆生食肉植物体内同化的猎物物种组成。
<b>3.</b> 水生<i>U. inflata</i>通过食肉途径获取的营养占比（约70%~100%）显著高于陆生物种（约30%~60%）。<i>Sarracenia purpurea</i>的营养主要来源于蚁科（Formicidae）昆虫。而<i>D. intermedia</i>的营养源随时空变化，在不同节肢动物类群间存在差异。
<b>4.</b> 水生<i>U. inflata</i>的营养获取中食肉途径占比极高，这可能与其缺乏根系且代谢速率较高有关。<i>Sarracenia purpurea</i>与<i>D. intermedia</i>可有效调控其栖息地的营养水平，或可从环境中的溶解有机氮中获益。本研究得到的猎物组成数据，可作为未来研究中贝叶斯分析方法的首份可用先验信息。明确食肉植物的营养来源，可为其生态生理学研究、保育工作以及脆弱的湿地生态系统保护提供宝贵的科学参考。