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Environmental Sciences

D-Index
47
Citations
11741
World Ranking
5685
National Ranking
440

Overview

Penny J Johnes is affiliated with the University of Bristol in the United Kingdom and has conducted extensive research in the fields of Environmental Science and Earth and Planetary Sciences. Their work spans several subfields, including Environmental Chemistry, Oceanography, Ecology, Nature and Landscape Conservation, and Water Science and Technology.

The research topics covered by Penny J Johnes include:

  • Marine and coastal ecosystems
  • Soil and Water Nutrient Dynamics
  • Fish Ecology and Management Studies
  • Aquatic Ecosystems and Phytoplankton Dynamics
  • Microbial Community Ecology and Physiology
  • Hydrology and Watershed Management Studies
  • Water Quality Monitoring and Analysis

The scientist has published research in several venues, with frequent contributions to:

  • Biogeochemistry
  • The Science of The Total Environment
  • Journal of Hydrology
  • Water
  • SSRN Electronic Journal

Recent papers authored or co-authored by Penny J Johnes demonstrate a focus on aquatic environments and nutrient dynamics:

  • Identifying the main drivers of change of phytoplankton community structure and gross primary productivity in a river-lake system (2020, Journal of Hydrology)
  • Dissolved organic nutrient uptake by riverine phytoplankton varies along a gradient of nutrient enrichment (2020, The Science of The Total Environment)
  • Gradients of Anthropogenic Nutrient Enrichment Alter N Composition and DOM Stoichiometry in Freshwater Ecosystems (2021, Global Biogeochemical Cycles)
  • Shifting stoichiometry: Long-term trends in stream-dissolved organic matter reveal altered C:N ratios due to history of atmospheric acid deposition (2021, Global Change Biology)
  • What do macroinvertebrate indices measure? Stressor-specific stream macroinvertebrate indices can be confounded by other stressors (2023, Freshwater Biology)

Penny J Johnes has collaborated frequently with several researchers, including:

  • Christopher A. Yates
  • Charlotte Lloyd
  • Davey L. Jones
  • Richard P. Evershed
  • Daren C. Gooddy

Best Publications

  • Nutrient Imbalances in agricultural development

    P.M. Vitousek;Rosamond L. Naylor;T. Crews;M.B. David

  • Evaluation and management of the impact of land use change on the nitrogen and phosphorus load delivered to surface waters: the export coefficient modelling approach

    Penny J. Johnes

  • The European Nitrogen Assessment

    Adrian Leip;Beat Achermann;Gilles Billen;Albert Bleeker

  • Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate

    Robert Howarth;Dennis Swaney;Gilles Billen;Josette Garnier

  • Uncertainties in annual riverine phosphorus load estimation: Impact of load estimation methodology, sampling frequency, baseflow index and catchment population density

    Penny J Johnes

  • Using hysteresis analysis of high-resolution water quality monitoring data, including uncertainty, to infer controls on nutrient and sediment transfer in catchments

    Charlotte E M Lloyd;Jim E Freer;Penny J Johnes;A. L. Collins

  • MODELLING THE IMPACT OF LAND USE CHANGE ON WATER QUALITY IN AGRICULTURAL CATCHMENTS

    Penny Johnes;A. L. Heathwaite

  • TRENDS IN NUTRIENTS

    A. Louise Heathwaite;Penny J. Johnes;Norman E. Peters

  • The determination of total nitrogen and total phosphorus concentrations in freshwaters from land use, stock headage and population data: testing of a model for use in conservation and water quality management

    Penny J Johnes;Brian Moss;Geoffrey Phillips

  • A comparison of models for estimating the riverine export of nitrogen from large watersheds

    Richard B. Alexander;Penny J. Johnes;Elizabeth W. Boyer;Richard A. Smith

  • Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities

    T. S. George;C. D. Giles;D. Menezes-Blackburn;Leo M. Condron

  • Contribution of nitrogen species and phosphorus fractions to stream water quality in agricultural catchments

    A. L. Heathwaite;Penny J Johnes

  • Major agricultural changes required to mitigate phosphorus losses under climate change

    M. C. Ockenden;M. J. Hollaway;K. J. Beven;A. L. Collins

  • Nitrogen as a threat to European water quality

    B Grizzetti;F Bouraoui;G Billen;H van Grinsven

  • Technical Note: Testing an improved index for analysing storm discharge–concentration hysteresis

    Charlotte E M Lloyd;Jim E Freer;Penny J Johnes;A. L. Collins

  • A procedure for the simultaneous determination of total nitrogen and total phosphorus in freshwater samples using persulphate microwave digestion

    Penny Johnes;A. L. Heathwaite

  • Integrating nitrogen fluxes at the European scale

    Adrian Leip;Beat Achermann;Gilles Billen;Albert Bleeker

  • Geophysical Research Abstracts

    Charlotte E M Lloyd;Jim E Freer;Penny J Johnes;A Collins

  • Nitrogen processes in aquatic ecosystems

    P Durand;L Breuer;Penny J. Johnes;G Billen

  • The Phosphorus Indicators Tool: a simple model of diffuse P loss from agricultural land to water

    A.L. Heathwaite;A.I. Fraser;P.J. Johnes;M. Hutchins

  • Freshwater Quality: defining the indefinable

    B. Moss;Penny J Johnes;G. L. Phillips

Frequent Co-Authors

Jim Freer
Jim Freer University of Bristol
Adrian L. Collins
Adrian L. Collins Rothamsted Research
Richard P. Evershed
Richard P. Evershed University of Bristol
Davey L. Jones
Davey L. Jones Bangor University
Brian Moss
Brian Moss University of Liverpool
John P. Bloomfield
John P. Bloomfield British Geological Survey
Tim Burt
Tim Burt Durham University
Ann Louise Heathwaite
Ann Louise Heathwaite Lancaster University
Daren Gooddy
Daren Gooddy British Geological Survey
Philip M. Haygarth
Philip M. Haygarth Lancaster University

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