Penny J. Johnes is an environmental scientist by background who has worked on the biogeochemistry of aquatic systems, and the impacts of food production and environmental change on the quality of inland and coastal waters for the past 30 years. She has provided advice to a range of UK Government and international agencies on the nature and scale of nutrient enrichment in waters, the consequences of this enrichment for ecosystem health, and the most effective strategies for the control of nutrient flux from land basd sources to waters. She is currently a member of the UNECE Task Force for Reactive Nitrogen and its Expert Panel on Nitrogen Budgets, is a member of the IAHS International Commission on Water Quality, sits on the Natural England Science Advisory Committee, Wessex Water Catchment Panel, Defra Biodiversity Targets Advisory Group, Defra Nutrient Management Expert Group, and is Chair of the Defra Water Expert Advisory Group.

• DOM in freshwaters: state of the science and future challenges.- DOM in the long arc of environmental science: looking back and thinking ahead.- Characterisation of riverine dissolved organic matter using a complementary suite of chromatographic and mass spectrometric methods .- Optical quality of dissolved organic matter in throughfall and stemflow varies across tree species and season in a temperate headwater forest.- Fingerprinting the elemental composition and chemodiversity of Arctic vegetation leachates: consequences for dissolved organic matter dynamics in Arctic environments.- The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of Southeast.- Anthropogenic land cover impacts fluvial dissolved organic matter composition in the Upper Mississippi River.- Determining patterns in the composition of dissolved organic matter in freshwaters according to land use and management.- Landscape controls on riverine export of dissolved organic carbon from Great Britain.- From Canopy to Consumer: What Makes and Modifies Terrestrial DOM in a Temperate Forest.

Penny J. Johnes is an environmental scientist by background who has worked on the biogeochemistry of aquatic systems, and the impacts of food production and environmental change on the quality of inland and coastal waters for the past 30 years. She has provided advice to a range of UK Government and international agencies on the nature and scale of nutrient enrichment in waters, the consequences of this enrichment for ecosystem health, and the most effective strategies for the control of nutrient flux from land basd sources to waters. She is currently a member of the UNECE Task Force for Reactive Nitrogen and its Expert Panel on Nitrogen Budgets, is a member of the IAHS International Commission on Water Quality, sits on the Natural England Science Advisory Committee, Wessex Water Catchment Panel, Defra Biodiversity Targets Advisory Group, Defra Nutrient Management Expert Group, and is Chair of the Defra Water Expert Advisory Group.

• DOM in freshwaters: state of the science and future challenges.- DOM in the long arc of environmental science: looking back and thinking ahead.- Characterisation of riverine dissolved organic matter using a complementary suite of chromatographic and mass spectrometric methods .- Optical quality of dissolved organic matter in throughfall and stemflow varies across tree species and season in a temperate headwater forest.- Fingerprinting the elemental composition and chemodiversity of Arctic vegetation leachates: consequences for dissolved organic matter dynamics in Arctic environments.- The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of Southeast.- Anthropogenic land cover impacts fluvial dissolved organic matter composition in the Upper Mississippi River.- Determining patterns in the composition of dissolved organic matter in freshwaters according to land use and management.- Landscape controls on riverine export of dissolved organic carbon from Great Britain.- From Canopy to Consumer: What Makes and Modifies Terrestrial DOM in a Temperate Forest.

Penny J. Johnes is an environmental scientist by background who has worked on the biogeochemistry of aquatic systems, and the impacts of food production and environmental change on the quality of inland and coastal waters for the past 30 years. She has provided advice to a range of UK Government and international agencies on the nature and scale of nutrient enrichment in waters, the consequences of this enrichment for ecosystem health, and the most effective strategies for the control of nutrient flux from land basd sources to waters. She is currently a member of the UNECE Task Force for Reactive Nitrogen and its Expert Panel on Nitrogen Budgets, is a member of the IAHS International Commission on Water Quality, sits on the Natural England Science Advisory Committee, Wessex Water Catchment Panel, Defra Biodiversity Targets Advisory Group, Defra Nutrient Management Expert Group, and is Chair of the Defra Water Expert Advisory Group.

• DOM in freshwaters: state of the science and future challenges.- DOM in the long arc of environmental science: looking back and thinking ahead.- Characterisation of riverine dissolved organic matter using a complementary suite of chromatographic and mass spectrometric methods .- Optical quality of dissolved organic matter in throughfall and stemflow varies across tree species and season in a temperate headwater forest.- Fingerprinting the elemental composition and chemodiversity of Arctic vegetation leachates: consequences for dissolved organic matter dynamics in Arctic environments.- The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of Southeast.- Anthropogenic land cover impacts fluvial dissolved organic matter composition in the Upper Mississippi River.- Determining patterns in the composition of dissolved organic matter in freshwaters according to land use and management.- Landscape controls on riverine export of dissolved organic carbon from Great Britain.- From Canopy to Consumer: What Makes and Modifies Terrestrial DOM in a Temperate Forest.