Evidence details

rebecca.killalea@canberra.edu.au on 09 Apr 2022

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Citation: Hobbie, S. E., Finlay, J. C., Janke, B. D., Nidzgorski, D. A., Millet, D. B., & Baker, L. A. (2017). Contrasting nitrogen and phosphorus budgets in urban watersheds and implications for managing urban water pollution. Proceedings of the National Academy of Sciences.
Study description: This study investigated the inputs and outputs of phosphorus and nitrogen into a watershed in Minnesota. The study looked at the dominant methods of input, retention of nutrients within the catchment and the output to the downstream waterways.

Cause term/trajectory: Land use/land cover - urban
Cause description: Household pet waste
Effect term/trajectory: Sediment quality - nutrients (phosphorus)
Effect description: Phosphorus input to the watershed. This study found that household pet waste input the most phosphorus into the watershed over the 7 catchments (contributing up to 76% of P inputs)
Response measure type: Other
Response measure description: Nutrient inputs were modelled based on a variety of information available within the watersheds and scaled according to land cover and land use estimates made in GIS. No statistical analyses noted in article for this relationship.

Source data: Other
Study type: Model
Study design: Other
Number of independent control or reference sampling units: 7
Sample size used in analysis: 7
Design description: Source data varies for different inputs. 7 different watersheds analysed.