@article {PIE107, title = {Tracing the flow of organic matter from primary producers to filter feeders in Ria Formosa Lagoon, Southern Portugal}, journal = {Estuaries}, volume = {26}, number = {4A}, year = {2003}, note = {Grad}, pages = {846-856}, keywords = {estuary, food web, LTER-PIE, stable isotope}, doi = {10.1007/BF02803343}, author = {Machas, R. and Santos, R. and Peterson, B.} }