During several years of study of Hudson River tributaries and other northeastern streams, we have tested indices of biological integrity for assessment and monitoring of stream quality and human impacts on streams (Stevens et al. 1994, Stevens 1995). These surveys involved the use of three communities: fishes, benthic macroinvertebrates, and diatoms. We found high correlations of macroinvertebrate and diatom indices with water quality (phosphate, sulfate, and chloride). The macroinvertebrate community appears to lose a substantial part of its integrity at rather modest levels of pollution. We are also studying the significance of tributary streams to spawning estuarine and anadromous fishes, and the influences of land use on these spawning habitats (Limburg & Schmidt 1990, Schmidt et al. 1992, Schmidt 1996).
Limburg, K.E. & R.E. Schmidt. 1990. Patterns of fish spawning in Hudson River tributaries: Response to an urban gradient? Ecology 71(4):1238-1245. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_005_87R_peer1.pdf
Schmidt, R.E. & Cooper, S. 1996. A catalog of barriers to upstream movement in migratory fishes in Hudson River Tributaries. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_011_95A_final_report.pdf
Schmidt, R.E. & Kiviat, E. 1988. Communities of larvae and juvenile fish associated with water-chestnut, watermilfoil and water-celery in the Tivoli Bays of the Hudson River. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_022_86B_final_report.pdf
Schmidt, R.E. & Lake, T.R. 1999. Alewives in Hudson River Tributaries. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_011_98A_final_report.pdf
Schmidt, R.E. & Lake, T.R. 2000. Alewives in the Hudson River Tributaries, two years of sampling. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_016_99A_final_report.pdf
Schmidt, R.E. & Limburg, K.E. 1989. Fishes spawning in non-tidal portions of the Hudson River Tributaries. Report to Hudson River Foundation. Hudsonia Limited. http://www.hudsonriver.org/ls/reports/Schmidt_005_87R_final_report.pdf
Schmidt, R.E. 1996. Migratory fishes and Hudson River tributaries. News from Hudsonia 12(1):1-5.
Schmidt, R.E., A.B. Anderson & K. Limburg. 1992. Dynamics of larval fish populations in the Hudson River tidal marsh. P. 458-475 in C.L. Smith, ed. Estuarine Research in the 1980s. State University of New York Press.
Stevens, G. 1995. Consciousness of streams. News from Hudsonia 11(1):1-5.
Stevens, G., R.E. Schmidt, D.R. Roeder, J.S. Tashiro & E. Kiviat. 1994. Baseline assessment of tributaries to the Hudson (BATH): water quality, fishes, macroinvertebrates, and diatoms in Fishkill Creek, Quassaic Creek, and Moodna Creek. Hudsonia Ltd., Annandale, NY. 2 vols.
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