Hydrobiologia

, Volume 501, Issue 1–3, pp 117–131 | Cite as

Identification of linear and threshold responses in streams along a gradient of urbanization in Anchorage, Alaska*

  • R. T. Ourso
  • S. A. Frenzel
Article

Abstract

We examined biotic and physiochemical responses in urbanized Anchorage, Alaska, to the percent of impervious area within stream basins, as determined by high-resolution IKONOS satellite imagery and aerial photography. Eighteen of the 86 variables examined, including riparian and instream habitat, macroinvertebrate communities, and water/sediment chemistry, were significantly correlated with percent impervious area. Variables related to channel condition, instream substrate, water chemistry, and residential and transportation right-of-way land uses were identified by principal components analysis as significant factors separating site groups. Detrended canonical correspondence analysis indicated that the macroinvertebrate communities responded to an urbanization gradient closely paralleling the percent of impervious area within the subbasin. A sliding regression analysis of variables significantly correlated with percent impervious area revealed 8 variables exhibiting threshold responses that correspond to a mean of 4.4 – 5.8% impervious area, much lower than mean values reported in other, similar investigations. As contributing factors to a subbasin's impervious area, storm drains and roads appeared to be important elements influencing the degradation of water quality with respect to the biota.

urbanization impervious area macroinvertebrates thresholds water quality 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • R. T. Ourso
    • 1
  • S. A. Frenzel
    • 1
  1. 1.Alaska Science CenterU.S. Geological Survey

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