Environmental Monitoring and Assessment

, Volume 77, Issue 3, pp 265–291

Development of a Provisional Physical Habitat Index for Maryland Freshwater Streams

Authors

  • Lenwood W. HallJr.
    • Agricultural Experiment Station, Wye Research and Education CenterUniversity of Maryland
  • Raymond P. MorganII
    • Center for Environmental Science, Appalachian LaboratoryUniversity of Maryland
  • Elgin S. Perry
  • Anita Waltz
    • Center for Environmental Science, Appalachian LaboratoryUniversity of Maryland
Article

DOI: 10.1023/A:1016084507654

Cite this article as:
Hall, L.W., Morgan, R.P., Perry, E.S. et al. Environ Monit Assess (2002) 77: 265. doi:10.1023/A:1016084507654

Abstract

Provisional physical habitat indices were developed and validatedfor Maryland Coastal and Non-Coastal Plain streams using variables (commonly called metrics) that best discriminated reference and degraded conditions based on biological, chemicaland land use data from the 1994–97 Maryland Biological Stream Survey (MBSS). These habitat indices contained variables that described structural, hydrological, vegetative and aesthetic components of stream habitat. Variables with the best discriminatory power for Coastal Plain streams were: instream habitat, velocity/depth diversity, pool/glide/eddy quality, embeddedness, maximum depth and aesthetic rating. Physical habitat variables with the best discriminatory power for Non-Coastal Plain sites were: instream habitat, velocity/depth diversity, riffle/run quality, embeddedness, number of rootwads and aesthetic rating. The overall classification efficiency forindex validation was 76% for both indices pooled over both strata. Scaled physical habitat index values (0–100) for bothstrata identified nearly twice as many good sites (31%) as very poor sites (16%). More than half the Maryland sites werein the poor to fair range (53%).

Chesapeake Bay watershedfreshwater streamsphysical habitat index

Copyright information

© Kluwer Academic Publishers 2002