Science & Technology
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Meet EPA Researcher Karoline Barkjohn, Ph.D.
EPA researcher Karoline Barkjohn works on understanding and improving data from lower cost air sensors. She is working on several exciting projects, including analyzing data from air sensors across the U.S. to better understand their performance and limita
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Meet EPA Researcher Jim Jetter, PE
EPA researcher Jim Jetter works with a research team to study air pollutant emissions and fuel efficiency for cooking technologies and fuels used around the world as part of an international initiative with other US government agencies, the Clean Cooking A
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Urbanization - Wastewater Inputs
Intro to wastewater inputs associated with urbanization, overview of combined sewer overflows, overview of how wastewater inputs can contribute to enrichment or eutrophication, overview of how wastewater inputs can affect reproduction by stream fauna.
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Urbanization - Physical Habitat
Introduction to physical habitat changes associated with urbanization, overview of how urbanization can lead to channel enlargement, summary of how road crossings can affect stream ecosystems, summary of how urbanization can alter streambed substrates.
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Urbanization - Temperature
This page covers how water temperature changes associated with urbanization, including heated surface runoff can affect stream biota and climate change.
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Flow Alteration
Introduction to the flow alteration module, when to list flow alteration as a candidate cause, ways to measure flow alteration, simple and detailed conceptual model diagrams for flow alteration, flow alteration module references and literature reviews.
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pH
This page introduces to the pH module, when to list pH as a candidate cause, ways to measure pH, simple and detailed conceptual model diagrams for pH, pH module references and literature reviews.
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Urbanization - Cited References
This page contains the references to the urbanization module as part of the CADDIS volume on sources, stressors and responses.
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Learn About Responses
This is the introductory page to the responses module, if there had been one.
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Metals - Point Source Releases
This page contains a table of point sources for metals releases to air, water and land pulled from the Toxic's Release Inventory (2002).
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Urbanization - Hydrology
This page includes hydrologic changes, baseflow changes, water withdrawals and interbasin transfers associated with urbanization, and biotic responses to hydrologic (or flow) changes associated with urbanization
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Conditional Probability Analysis: EPT Taxa Richness < 9 vs. Percent Fines for Mid-Atlantic Highland Streams
This section provides examples of stressor-response associations and species sensitivity distributions for common stressors.
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Quantile Regression: Number of Salmonids vs. Metal Toxicity Units for Colorado Streams
This section provides examples of stressor-response associations and species sensitivity distributions for common stressors.
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Worksheet Examples
14 Worksheets based on the Little Scioto River, Ohio case study included as an example.
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Basic Principles & Issues
Basic principles for data analysis uses inferential statistics, data independence and autocorrelation methods to identify and control confounding variables.
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Conditional Probability Analysis: Fish IBI < 40 vs. Total Suspended Solids for Iowa Streams
This section provides examples of stressor-response associations and species sensitivity distributions for common stressors.
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Linear Regression: Non-insect Relative Abundance vs. Percent Sands and Fines for Minnesota Streams
This section provides examples of stressor-response associations and species sensitivity distributions for common stressors.
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State Examples
This page includes examples of state and other regulatory entities use of the CADDIS application in causal analysis.
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Basic Analyses
Overview of quantile regression analysis includes insight on simplifying assumptions.
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Estimating Taxon-Environment Relationships: Data Requirements
Overview of PECBO Module, using scripts to infer environmental conditions from biological observations, statistically estimating species-environment relationships, methods for inferring environmental conditions, statistical scripts in module.