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Rock Weirs & Habitat Heterogeneity. Cache River. Cache Weirs. Installed in an attempt to save Heron Pond by: Raising stream bed elevation by depositing sediment Recent research indicates an overall loss of 2ft since 1996 Directing erosion away from Heron Pond

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Rock weirs habitat heterogeneity

Rock Weirs &Habitat Heterogeneity

Cache River


Cache weirs
Cache Weirs

  • Installed in an attempt to save Heron Pond by:

    • Raising stream bed elevation by depositing sediment

      • Recent research indicates an overall loss of 2ft since 1996

    • Directing erosion away from Heron Pond

      • Bank erosion continues at a rate of .10/ft per year

    • Stepping stream more gradually

    • Reducing stream power


Fish ladders locks and dams
Fish ladders, locks and dams……..

The current trend in the WEST is to tear out as many of these as possible.


Lots of questions
Lots of Questions

  • Why are we putting hard structures into the stream?

  • How have the weirs affected the physical environment?

  • Have the weirs improved the hydrology? If so for how long?


I thought i was interested in hydrology
I thought I was interested in Hydrology

And then research happened!


Restoration ecology
Restoration Ecology

  • Efforts are often driven by very specific goals

  • Preservation of one species can have negative consequences on others

  • Variables are numerous

  • Action taken

  • Pre and post research is difficult to complete

  • Lack of funding

  • Too many variables

  • Lack of knowledge about pre disturbancelandscape and biology

  • Evaluation nonexistent or incomplete

Decisions

Research


Cache weirs1
Cache Weirs

  • Weirs have been shown to increase Macroinvertebrate biomass but not biodiversity as the habitat heterogeneity hypothesis suggests (Walter & Wiles 2008)

Heterogeneity Hyothesis

(MacArthur & MacArthur 1961)



It s a lot like
It’s a lot like…. techniques

Wildlife science: gaining reliable knowledge (Romesberg 1981)

“Wildlife science must try the H-D method. Without it the ability to detect errors in pronouncements of laws, the self-correcting feature science must have, is fatally lacking. All learning takes place in a feedback system in which ideas and reality interplay. The method of retroduction coupled with the H-D method is such a feedback system. Uncouple them and the ability to learn, to tell error from truth, is hindered, if not destroyed.”


Proposal
Proposal techniques

  • Are the two significantly different as assumed?

  • How much habitat heterogeneity is present at each location type?

  • Study physical habitat of weir and non-weir sites

  • Assess discharge

  • Bank width

  • Depth

  • Canopy cover, etc


At the cache
At the Cache techniques

  • Restoration

  • Conservation

  • Preservation

Complex overlap of disciplines-

hydrology

biology

ecology:

landscape

restoration

engineering

economics

Photo used without permission !


The end
The end techniques


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