Data for making Fig. 3

<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.