Life SciencesEcologyBiogeochemistryFreshwater EcologyTrophic EcologyFood Web DynamicsFood WebsFreshwater BiogeochemistryIsotope BiogeochemistryStable Isotope AnalysisStable Isotope GeochemistryElemental Ratios In Food WebsFreshwater Food WebsStable Isotope PartitioningStable Isotope TracingStable Isotope Trophic Analysis