ResearchWorks Archive

Effects of Urbanization on the Biological Integrity of Puget Sound Lowland Streams: Restoration with a Biological Focus

Show simple item record Morley, Sarah Ann 2011-08-16T18:33:49Z 2011-08-16T18:33:49Z 2000
dc.description.abstract Rapid urbanization threatens the condition of streams and rivers across the Pacific Northwest. Efforts to protect and control urban streams have traditionally focused on physical channel conditions and chemical water quality. This study is designed to use biological attributes of these streamsmeasured with the multimetric index of biological integrity (B-IBI) based on benthic macroinvertebratesto assess stream condition. Between 1997 and 1999, invertebrate samples were collected from 45 sites in second and third order streams of the Puget Sound lowlands of Western Washington. The locations of 14 sites were chosen to evaluate the placement of large woody debris (LWD) as a restoration technique on five streams. Urbanization was characterized by a 1998 satellite land cover classification and was measured across several spatial scales. The relationships among metrics of the B-IBI and stream substrate and hydrologic features were also evaluated at a sub-set of sampling sites. B-IBI declined as urban land cover increased both across the entire basin and within riparian zones. The effectiveness of localized patches of riparian corridor in maintaining biological integrity varied as a function of the percentage of urban land cover in the sub-basin. Channel roughness and hydrologic flashiness were also correlated with B-IBI. Below the five restoration projects, there was no overall detectable improvement in B-IBI. The aquatic biota is sensitive to a variety of urban impacts controlled over both large and small spatial scales. Restoration efforts that deal with only one local impact type without addressing larger scale issues are unlikely to successfully restore the biota of degraded streams. en_US
dc.description.sponsorship National Science Foundation; U.S. Environmental Protection Agency; ARCS Foundation scholarship; en_US
dc.language.iso en_US en_US
dc.publisher University of Washington en_US
dc.rights Copyright is held by the individual authors. en_US
dc.subject urbanization en_US
dc.subject streams en_US
dc.subject rivers en_US
dc.subject limnology en_US
dc.subject macroinvertebrates en_US
dc.subject lowlands en_US
dc.subject Washington en_US
dc.subject vegetation cover en_US
dc.subject riparian buffers en_US
dc.subject riparian areas en_US
dc.subject stream channels en_US
dc.subject watershed hydrology en_US
dc.subject watershed management en_US
dc.subject anthropogenic activities en_US
dc.subject coarse woody debris en_US
dc.subject geographic information systems en_US
dc.subject ecological restoration en_US
dc.title Effects of Urbanization on the Biological Integrity of Puget Sound Lowland Streams: Restoration with a Biological Focus en_US
dc.type Thesis en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ResearchWorks

Advanced Search


My Account