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Per-Erik Mellander

Research Officer - Catchment Scientist

Research Interests

I am a Senior Research Officer in Catchment Science with an interest in advancing knowledge in water quality issues under the impacts of agriculture and changing climate. I am the manager and scientific lead of the water quality section of the Agricultural Catchments Programme. My research focus is on runoff driven losses of nutrients and pesticides in river catchments in present and future climate.

I currently lead a team of 3 Research Officers, 3 Technologists, 2 Technicians, 1 Post-doc and 3 PhD students.

Research Team

Research Officers

  • Jason Galloway
  • Daniel Hawtree



 Post-doctoral Research Fellows

  • Golnaz Ezzati

 PhD Students

Current Projects


  • 2018 – Managing People - Management Development
  • 2017 – Manager Training
  • 2004 - PhD: Swedish University of Agricultural Sciences, Department of                            Aquatic Sciences
  • 2001 - LSc: Swedish University of Agricultural Sciences, Department of Aquatic                Sciences
  • 1994 - MSc, Uppsala University, Department of Earth Sciences  


  • 2017 - Lead Scientist (water quality): Agricultural Catchments Programme,                      Teagasc, Johnstown Castle
  • 2016 - Senior Research Officer: Catchment Science, Teagasc, Johnstown Castle
  • 2008 - Research Officer: Agricultural Catchments Programme, Teagasc,                          Johnstown Castle
  • 2006 - Researcher and lecturer: Department of Natural and Environmental                    Sciences, Mid Sweden University
  • 2004 - Post-Doc: Department of Forest Ecology, Swedish University of                             Agricultural Sciences
  • 1998 - Research technician: Vindeln Experimental Forests, Swedish University                of Agricultural Sciences
  • 1995 - Research technician: Department of Earth Sciences, Uppsala University.

Per-Erik has published many peer reviewed scientific papers. Listed below are some articles he published since 2020.

Per-Erik's Google Scholar account

Atcheson K, Mellander P-E, Cassidy R, Cook S, Floyd S,  McRoberts C, Morton PA, Jordan P (2022). Quantifying MCPA load pathways at catchment scale using high temporal resolution data, Water Research, 220, 118654.

McAleer E, Coxon CE, Mellander P-E, Grant J, Richards K (2022). Patterns and drivers of groundwater and stream nitrate concentrations in intensively managed agricultural catchments. Water, 14, 1388.

Harmon O’Driscoll J, Siggins A, Healy MG, McGinley J, Mellander P-E, Morrison L, Ryan P (2022). A risk ranking of pesticides for chronic health effects in Irish drinking water. Science of the Total Environment, doi.org/10.1016/j.scitotenv.2022.154532.

Mellander P-E, Lynch B, Galloway J, Žurovec O, McCormack M, O’Neill M, Hawtree, D, Burgess E (2022). Benchmarking a decade of holistic agro-environmental studies within the Agricultural Catchments Programme. Irish Journal of Agricultural and Food Research

Manley A, Collins AL, Joynes A, Mellander P-E, Jordan P (2022). Coupled steroid and phosphorus leaching from cattle slurry at lysimeter scale. Journal of Contaminant Hydrology, DOI: 10.1016/j.jconhyd.2022.103979.

McGinley J, Harmon O’Driscoll J, Healy MG, Ryan P, Mellander P-E, Morrison L, Callery O, Siggins A (2022). An assessment of potential pesticide transmission to waterways, considering soil texture and pesticide properties. Soil Use and Management, DOI: 10.1111/sum.12794.

Vero SE, Suagata D, Mellander P-E, Morton PA, Floyd S, Cassidy R, Uwimana A, van Dam AA (2022). Agricultural case studies: Nutrient pressures in an intensively managed agricultural catchment. Encyclopaedia of Inland Waters. 2nd Edition. Elsevier, DOI: 1016/B978-0-12-819166-8.00095-5

Fresne M, Jordan P, Daly K, Fenton O., Mellander P-E (2022). The role of colloids and other fractions in the below-ground delivery of phosphorus from agricultural hillslopes to streams. CATENA, 208, 105735.

Vero SE, Cassidy R, Higgins S, Doody D, Nicholls G, Campbell J, Mellander P-E, McDonald N, Burgess E, Daly K, Sherry E (2021). Comparison of soil phosphorus index systems for the cross-border region of Ireland: Implications for nutrient management and water quality. Journal of Plant Nutrition and Soil Science, DOI: 10.1002/jpln.202100194.

Mellander P-E, Jordan P (2021). Charting a perfect storm of water quality pressures in Ireland. Science of the Total Environment, 787, 147576.

Karki S, Bermejo R, Wilkes R, Mac Monagail M, Daly E, Healy M, Hanafin J, McKinstry A, Mellander P-E, Fenton O, Morrison L (2021). Mapping Spatial Distribution and Biomass of Intertidal Ulva Blooms using Machine Learning and Earth Observation. Frontiers in Marine Science, doi: 10.3389/fmars.2021.633128.

Mooney D, Coxon C, Richards KG, Gill L, Mellander P-E, Danaher M (2021). An analysis of the spatio-temporal occurrence of anthelmintic veterinary drug residues in groundwater. Science of the Total Environment, 769, 144804.

Fresne M, Jordan P, Fenton O, Mellander P-E, Daly K (2021). Soil chemical and fertiliser influences on soluble and colloidal phosphorus in agricultural soils. Science of the Total Environment, 754, 142112.

Campling P, Joris I, Calliera M, Capri E, Marchis A, Kuczyńska A, Vereijken T, Burczyk P, Majewska Z, Juszkowska D, Przychodzka M, Belmans E, Borremans L, Dupon E, Pauwelyn E, Mellander P-E, Fennell C, Fenton O, Burgess E, Puscas, Isla Gil E, Lopez de Alda M, Francès Tudel G, Andersen E, Lajer Højber A, Suciu N (2021). A multi-actor, participatory approach to identify policy and technical barriers to better farming practices that protect our drinking water sources. Science of the Total Environment, 755, 142971.

Shahvi S, Mellander P-E, Jordan P, Fenton O (2021). A Fuzzy Cognitive Map method for integrated and participatory water governance. Science of the Total Environment, 750, 142193.

Vero S, McDonald NT, McGrath G, Mellander P-E (2020). The Beast from the East; Impact of an atypical cold weather event on hydrology and nutrient dynamics in Irish catchments. Irish Journal of Agricultural and Food Research, DOI: 10.15212/ijafr-2020-0108 IJAFR, 1-10.

Khan AK, Barros Costa F, Fenton O, Jordan P, Fennell C, Mellander P-E (2020).  Using a multi-dimensional approach for catchment scale herbicide pollution assessments. Science of the Total Environment, 747, 141232.

Bieroza M, Dupas R, Glendell M, McGrath G, Mellander P-E (2020). Hydrological and Chemical Controls on Nutrient and Contaminant Loss to Water in Agricultural Landscapes.  Water, 12(12), 3379.

Manley A, Collins AL, Joynes A, Mellander P-E, Jordan P (2020). Comparing extraction methods for biomarker steroid characterisation from soil and slurry. Water, Air, & Soil Pollution, 231:254.

Mooney D, Coxon C, Richards KG, Gill L, Mellander P-E, Danaher M (2020). An investigation of anticoccidial veterinary drugs as emerging organic contaminants in groundwater. Science of the Total Environment, 746, 141116.

Mooney D, Coxon C, Richards KG, Gill L, Mellander P-E, Danaher M (2020).A new sensitive method for the simultaneous chromatographic separation and tandem mass spectrometry detection of anticoccidials, including highly polar compounds, in environmental waters. Journal of Chromatography A, doi.org/10.1016/ j.chroma.2020. 460857.

Morton P, Fennell C, Cassidy R, Doody D, Fenton O,  Mellander P-E, Jordan P (2020). A review of the pesticide MCPA in the land-water environment and emerging research needs. WIRES-water, doi:10.1002/wat2.1402.