Instar Science - Approaches INSTAR uses two different techniques to assess streams and watersheds. Probabilistic study reaches for INSTAR sampling are selected through a statistically powerful stratified (by stream order) random design. Within each geo-referenced stream reach (150-200 m, depending on stream width), fishes are sampled quantitatively; fish are identified to species in the field, enumerated, and released. Macroinvertebrates are collected using modified EPA Rapid Bioassessment Protocols (RBP III); major stream habitat types are sampled separately and invertebrate collections are returned to VCU for identification to the lowest practical taxon and enumeration. Data are compiled into databases and application macros calculate over 50 separate ecological metrics, including those typically generated for Index of Biotic Integrity (IBI) and Rapid Bioassessment Protocol (RBP) assessments. INSTAR evaluates the ecological health of stream reaches based on percent comparability of emperical data to the appropriate (e.g. basin, stream order) reference model. Watershed biotic integrity is evaluated with a modified Index of Biotic Integrity (mIBI). In addition to extensive stream community data collected by VCU biologists for INSTAR, appropriate data from other sources (e.g. agencies, universities) are screened for inclusion in the database, based on stringent QA criteria. Watershed Assessment
|
|
This document was last updated on
November 14, 2008
Virginia Commonwealth University Center for Environmental Studies 1000 West Cary Street - Richmond, Virginia 23284 - 804-828-7202 (Phone) - 804-828-1622 (fax) - Contact the INSTAR team |