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EM: Development of an aquatic vertebrate index of biotic integrity (IBI) for Western streams, USA (EM-821)
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EM Identity and Description
EM Identification
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EM ID
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EM-821 |
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EM Short Name
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Aquatic vertebrate IBI for Western streams, USA |
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EM Full Name
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Development of an aquatic vertebrate index of biotic integrity (IBI) for Western streams, USA |
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EM Source or Collection
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None |
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EM Source Document ID
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404 |
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Document Author
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Pont, D., Hughes, R.M., Whittier, T.R., and S. Schmutz. |
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Document Year
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2009 |
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Document Title
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A Predictive Index of Biotic Integrity Model for A predictive index of biotic integrity model foraquatic-vertebrate assemblages of Western U.S. Streams |
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Document Status
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Peer reviewed and published |
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Comments on Status
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Published journal manuscript |
Software and Access
| Not applicable | |
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Contact Name
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Didier Pont |
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Contact Address
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Centre d’E´ tude du Machinisme Agricole et du Genie Rural, des Eaux et Foreˆts (Cemagref), Unit HYAX Hydrobiologie, 3275 Route de Ce´zanne, Le Tholonet, 13612 Aix en Provence, France |
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Contact Email
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didier.pont@cemagref.fr |
EM Description
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Summary Description
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ABSTRACT: "Because of natural environmental and faunal differences and scientific perspectives, numerous indices of biological integrity (IBIs) have been developed at local, state, and regional scales in the USA. These multiple IBIs, plus different criteria for judging impairment, hinder rigorous national and multistate assessments. Many IBI metrics are calibrated for water body size, but none are calibrated explicitly for other equally important natural variables such as air temperature, channel gradient, or geology. We developed a predictive aquatic-vertebrate IBI model using a total of 871 stream sites (including 162 least-disturbed and 163 most-disturbed sites) sampled as part of the U.S. Environmental Protection Agency’s Environmental Monitoring and Assessment Program survey of 12 conterminous western U.S. states. The selected IBI metrics (calculated from both fish and aquatic amphibians) were vertebrate species richness, benthic native species richness, assemblage tolerance index, proportion of invertivore–piscivore species, and proportion of lithophilic-reproducing species. Mean model IBI scores differed significantly between least-disturbed and most-disturbed sites as well as among ecoregions. Based on a model IBI impairment criterion of 0.44 (risks of type I and II errors balanced), an estimated 34.7% of stream kilometers in the western USA were deemed impaired, compared with 18% for a set of traditional IBIs. Also, the model IBI usually displayed less variability than the traditional IBIs, presumably because it was better calibrated for natural variability. " |
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Specific Policy or Decision Context Cited
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None reported |
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Biophysical Context
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Wadeable and boatable streams in 12 western USA states |
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EM Scenario Drivers
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not applicable |
EM Relationship to Other EMs or Applications
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Method Only, Application of Method or Model Run
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Method + Application View EM Runs |
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New or Pre-existing EM?
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New or revised model |
Related EMs (for example, other versions or derivations of this EM) described in ESML
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Document ID for related EM
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Doc-403 |
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EM ID for related EM
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EM-820 | EM-826 |
EM Modeling Approach
EM Relationship to Time
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EM Temporal Extent
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2004-2005 |
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EM Time Dependence
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time-dependent |
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EM Time Reference (Future/Past)
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past time |
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EM Time Continuity
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Not applicable |
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EM Temporal Grain Size Value
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Not applicable |
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EM Temporal Grain Size Unit
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Not applicable |
EM Spatial Extent
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Bounding Type
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Geopolitical |
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Spatial Extent Name
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Western 12 states |
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Spatial Extent Area (Magnitude)
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>1,000,000 km^2 |
Spatial Distribution of Computations
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EM Spatial Distribution
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spatially distributed (in at least some cases) ?Comment:871 total sites surveyed for this work |
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Spatial Grain Type
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other (specify), for irregular (e.g., stream reach, lake basin) |
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Spatial Grain Size
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stream reach |
EM Structure and Computation Approach
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EM Computational Approach
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Analytic |
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EM Determinism
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deterministic |
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Statistical Estimation of EM
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Model Checking Procedures Used
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Model Calibration Reported?
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No |
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Model Goodness of Fit Reported?
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No |
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Goodness of Fit (metric| value | unit)
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None |
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Model Operational Validation Reported?
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Yes ?Comment:Compared to another journal manuscript IBI scores (Whittier et al) |
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Model Uncertainty Analysis Reported?
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No |
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Model Sensitivity Analysis Reported?
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Yes |
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Model Sensitivity Analysis Include Interactions?
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Yes |
EM Locations, Environments, Ecology
Location of EM Application
Terrestrial location (Classification hierarchy: Continent > Country > U.S. State [United States only])
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Marine location (Classification hierarchy: Realm > Region > Province > Ecoregion)
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| None |
Centroid Lat/Long (Decimal Degree)
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Centroid Latitude
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44.2 |
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Centroid Longitude
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-113.07 |
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Centroid Datum
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WGS84 |
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Centroid Coordinates Status
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Estimated |
Environments and Scales Modeled
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EM Environmental Sub-Class
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Rivers and Streams |
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Specific Environment Type
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wadeable and boatable streams |
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EM Ecological Scale
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Ecological scale is finer than that of the Environmental Sub-class |
Scale and taxa of organisms modeled
Scale of differentiation of organisms modeled
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EM Organismal Scale
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Guild or Assemblage |
Taxonomic level and name of organisms or groups identified
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EnviroAtlas URL
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| Total Annual Reduced Nitrogen Deposition, U.S. EPA (Omernik) ecoregions |
EM Ecosystem Goods and Services (EGS) potentially modeled, by classification system
CICES v 4.3 - Common International Classification of Ecosystem Services (Section > Division > Group > Class)
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(Environmental Subclass > Ecological End-Product (EEP) > EEP Subclass > EEP Modifier)
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EM Variable Names (and Units)
Predictor
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Intermediate
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Intermediate (Computed) Variables (and Units)
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None |
Response
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