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Macroinvertebrate Response to Geomorphologic Change
Jessica Roark
Date Created and/or Issued
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
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Scope/Content: Abstract: In this paper I will discuss attempts to quantify ecosystem health in relation to geomorphologic change using macroinvertebrates as a measure. Macroinvertebrates are commonly used to assess ecosystem health and indices exist that evaluate habitat based on water quality, such as HBI (Hilsenhoff Biotic Index) and Shannon Index for diversity. These indices are based on richness and density of marcorinvertebrate insect orders and their occurrence in relation to water quality conditions. Richness and density are important tools in assessing ecosystem health. Their appearance indicatesthat an ecosystem is stable and self-sustaining. Using data from an ongoing study by Chuck Podolak with JHU (Johns Hopkins University) on geomorphologic changes of the Sandy River, OR after a large dam removal it was possible to categorize the studied habitats as unchanged (old) and changed (new). It is important to study changes after dam removal because downstream effects such as sedimentation may alter species composition of the river ecosystem. Studies exist on ecological changes after small dam removal (Stanley et al. 2002, Thompson et al. 2005) which focus on stream health upstream in comparison to downstream. None of these focus on large dam removals and/or investigate ecological responses to specific habitat changes. With the current study's information collected from macroinvertebrate samples and in depth information on physical habitat changes we may be able to use the relationship between the two to predict whether altering physical stream conditions will affect the health of macroinvertebrates and thus indicate the health of the stream.
Scope/Content: Date constructed: 1913. Date removed: 2007.
Pre- and post-project monitoring
Dam retirement
Sandy River, OR
Marmot Dam

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