Quantifying trophic niche spaces of small mammals using stable isotopes (δ15N and δ13C) at two scales across Alaska

摘要: Changing climate conditions are causing global distribution shifts, resulting in altered food webs and novel species assemblages terrestrial systems. How diets of sympatric small mammals overlap whether this may translate into competitive exclusion among new interactions remains largely unknown. Monitoring niche changing arctic boreal communities can assist forecasting interspecific competition turnover. We quantified the isotopic spaces mammals, which reflect dietary spaces, at study sites along two megatransects spanning Alaska. Field sampling resulted capture 724 belonging to 12 rodent (10 Arvicolinae 2 Sciuridae) 6 shrew (genus Sorex L., 1758). created mixing models based on hair samples for four using stable isotope (δ15N δ13C) analyses R. also modeled ellipses large scales...