Evidence details
30 Apr 2020
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Study
- Citation
- Lee et al. (2019). Taxonomic harmonization may reveal a stronger association between diatom assemblages and total phosphorus in large datasets. Ecological Indicators.
- Study description
- USEPA's National Rivers and Streams Assessment dataset from 2008-2009 survey of diatoms and water chemistry. Sampling sites selected using a probabilistic statistical design. The paper quantifies responses of diatom assemblages to environmental variables after corrections were made to minimize bias due to taxonomic inconsistency.
Response
- Cause term/trajectory
-
Water quality - nutrients (phosphorus)
(Change)
- Cause description
- Total phosphorus
- Effect term/trajectory
-
Algae - community structure
(Change)
- Effect description
- Diatom assemblage composition in multi-metric space, exclusively selecting taxa with variation explained by total phosphorus according to random forest analysis.
- Response measure type
- R-squared - other
- Response measure value
- 0.2
- Documentation
- Text page 170, section 3.5
- Response measure description
- R-squared - PERMANOVA
Design
- Source data
- Field
- Study type
- Observation
- Study design
- Spatial gradient
- Number of independent control or reference sampling units
- 1714
- Sample size used in analysis
- 1714
- Design description
- Diatom assemblage composed of 35 taxa for which total phosphorus was among the top 5 predictors of relative abundance
Context
- Climate
- Multiple
- Country
- United States
- Habitat
- Stream/river
- Spatial extent
- Continental
- Temporal extent
- Snapshot
- Context description
- USEPA NRSA 2008-2009 climate varied by region of the conterminous U.S.A.