%0 Journal Article %J Estuaries %D 2003 %T Tracing the flow of organic matter from primary producers to filter feeders in Ria Formosa Lagoon, Southern Portugal %A Machas, R. %A Santos, R. %A Peterson, B. %K estuary %K food web %K LTER-PIE %K stable isotope %B Estuaries %V 26 %P 846-856 %G eng %M PIE107 %] NSF-LTER-PIE %R 10.1007/BF02803343 %F Journal Article