JSM 2004 - Toronto

Abstract #300149

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Activity Number: 287
Type: Invited
Date/Time: Wednesday, August 11, 2004 : 8:30 AM to 10:20 AM
Sponsor: Environmental and Ecological Statistics
Abstract - #300149
Title: Coupling Biological Impairment of Freshwater Streams and Human Dimensions
Author(s): Denice Wardrop*+ and Wayne Myers and Patil Ganapati and Charles Taillie
Companies: Pennsylvania State University and Pennsylvania State University and Pennsylvania State University and Pennsylvania State University
Address: Institutes of the Environment, University Park, PA, 16802,
Keywords: biological integrity ; covariate adjustment ; critical stream subnetworks ; hotspot detection ; scan statistic ; upper-level set scan statistic
Abstract:

Human impacts on freshwater streams are well documented and have generated frequent remedial responses, but the goal of restoring their chemical, physical, and biological integrity has not been fully attained. Thus, improvement of the ecological condition of the waters of the U.S. continues to be a broadly pursued goal. The current state of the science identifies several issues: (1) need for a hierarchical process to identify critical stream segments with progressively greater specificity; and (2) need for improvement in the articulation of landscape properties relevant to aquatic resource condition. The presentation describes a new analysis of the stream systems of Pennsylvania that: (1) identifies critical stream subnetworks having low biological integrity, by application of the network version of the upper level set (ULS) scan statistic; and 2) reassesses these subnetworks after taking into account potential explanatory factors. This is accomplished by adjusting expected responses for these factors based on statewide data and re-applying the ULS scan statistic. Three categories of factors are evaluated: descriptive, structural, and network-related.

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