Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock ( Lock A locked padlock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

  • Environmental Topics
  • Laws & Regulations
  • Report a Violation
  • About EPA
Risk Assessment
Contact Us

Synthesizing Effects of Total Nitrogen and Total Phosphorus on River and Stream Ecosystems: Systematic Review Update

On this page:

  • Overview
  • Downloads
Our team has been working to complete three systematic reviews of the scientific literature to provide a comprehensive synthesis of studies investigating how stream and river ecosystems (and specifically chlorophyll-a, diatom, and benthic macroinvertebrate endpoints) respond to total nitrogen and total phosphorus concentrations. After screening through thousands of potentially relevant articles, we have identified more than 300 articles that report relationships between these nutrients and endpoints. We have completed the initial data extraction from all articles (of more than 20 environmental variables and more than a dozen other context variables) and are completing the final stages of the review: checking data consistency by completing double-extraction of 25% of articles (by endpoint), contacting authors for missing relationships and data (for chl-a), and extracting data from article figures and tables to calculate relationships (for chl-a). When we have finalized the extracted data, we will investigate nutrient stressor-response relationships and thresholds from the dataset – focusing initially on chl-a.

Impact/Purpose

The purpose of this article is to update colleagues and stakeholders on our systematic reviews and to disseminate information to new potential users through the National Water Quality Monitoring Council newsletter.

Citation

Bennett, M., S. Lee, Katharine Schofield, AND C. Ridley. Synthesizing Effects of Total Nitrogen and Total Phosphorus on River and Stream Ecosystems: Systematic Review Update. In: National Water Monitoring News,National Water Quality Monitoring Council5, (2019).

Download(s)

  • https://acwi.gov/monitoring/newsletter/national-monitoring-news_spring2019.pdf
  • Risk Assessment Home
  • About Risk Assessment
  • Risk Recent Additions
  • Human Health Risk Assessment
  • Ecological Risk Assessment
  • Risk Advanced Search
    • Risk Publications
  • Risk Assessment Guidance
  • Risk Tools and Databases
  • Superfund Risk Assessment
  • Where you live
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on September 02, 2021
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshots
  • Grants
  • No FEAR Act Data
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.