Adam J. Sepulveda 2017 <p><span>The importance of trophic linkages between aquatic and terrestrial ecosystems is predicted to vary as a function of subsidy quantity and quality relative to </span><i>in situ </i><span>resources. To test this prediction, I used multi-year diet data from Bonneville cutthroat trout </span><i>Oncorhynchus clarki Utah </i><span>in spring-fed and snowmelt-driven streams in the high desert of western North America. I documented that trout in spring-fed streams consumed more (number and weight) aquatic than terrestrial invertebrates, while trout in snowmelt-driven streams consumed a similar number of both prey types but consumed more terrestrial than aquatic invertebrates by weight. Trout in spring-fed streams consumed more aquatic invertebrates than trout in snowmelt streams and trout consumed more terrestrial invertebrates in snowmelt than in spring-fed streams. Up to 93% of trout production in spring-fed streams and 60% in snowmelt streams was fueled by aquatic invertebrates, while the remainder of trout production in each stream type was from terrestrial production. I found that the biomass and occurrence of consumed terrestrial invertebrates were not related to our measures of </span><i>in situ </i><span>resource quality or quantity in either stream type. These empirical data highlight the importance of autotrophic-derived production to trout in xeric regions.</span></p> application/pdf 10.1080/02705060.2017.1284696 en Oikos Publishers Terrestrial–aquatic linkages in spring-fed and snowmelt-dominated streams article