1 Table of Contents: “... on Canadian aquatic ecosystems -- More is less: agricultural impacts on the N cycle in Argentina -- Human...”

2 “...Human activity has dramatically altered the global nitrogen cycle in recent decades. These changes...”

3 Table of Contents: “... of the nitrogen cycle? -- Anthropogenic nitrogen sources and relationships to riverine nitrogen export...”

4 Table of Contents: “... -- 9 Microbial Carbon Cycling in Pelagic Ecosystems: Microbial Methods for Ecosystem Scientists -- 10...”