From ceegradv@ce.washington.edu Tue Apr 27 10:21:23 1999
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Date: Tue, 27 Apr 1999 10:20:57 -0700 (PDT)
From: CEE Grad Advising <ceegradv@ce.washington.edu>
To: Graduate Students in CEE <cegrads@u.washington.edu>
Subject: Grazing/stream study presentation (fwd)
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Correction!

---------- Forwarded message ----------
Date: Tue, 27 Apr 1999 09:55:41 -0700 (PDT)
From: "D. Gilvydis" <gilvydis@u.washington.edu>
To: ceegradv@ce.washington.edu
Subject: Grazing/stream study presentation


	My first message failed to include the time of my presentation.
What follows is the corrected version...

	Dalius

> 	I want to announce that on Friday, April 30th, I will give a 
> presentation on my research project.  The presentaion will be given in
> Wilcox 264 at 10 am.  The presentation will be on...
> 
> "A Meta-analysis of Cattle Grazing Impacts on Salmonid Stream Habitat Quality"
>  
> Abstract: The effects of cattle grazing on stream habitat quality has been
> the focus of intensive study for well over thirty years.  These studies
> usually have very small sample sizes, large variability and classic
> problems with "pseudoreplication"; all of which make it difficult to
> detect statistically significant effects.  In order to partially overcome
> some of these problems, I conducted a meta-analysis of 23 studies
> concerning  cattle grazing impacts on fish populations, stream morphology,
> riparian  vegetation cover, and substrate composition.  This analysis
> shows cattle grazing  in the riparian zones of small streams causes
> salmonid populations to decrease by 0.32 standard deviations (SD; studies
> summarized (n = 11)), and non salmonid fish to increase by 1.17 SD (n =
> 6).    Fish biomass (kg/km) data show similar trends with a 0.37 SD (n =
> 9) decrease and a 4.23 SD (n = 3) increase in salmonid and non-salmonid
> fish biomass, respectively. Grazing changes the physical habitat by
> causing streams to widen (2.15 SD; n = 11) and become shallower (-1.64 SD;
> n = 11).  Grazing also reduces the availability of high quality salmonid
> habitat such as pools (-0.91 SD; n = 4), bank undercuts (-1.71 SD; n = 5),
> and overhanging vegetation (-2.00 SD; n = 3).  The availability of
> salmonid spawning habitat is diminished by an increase in substrate
> embeddedness (3.35; n = 4).  This analysis shows cattle grazing can have
> marked impacts on the habitat quality of small streams for salmonid fish,
> and these changes manifest themselves in lower salmonid and higher
> non-salmonid fish abundance and biomass.	
> 
> ___________________________________________________
> Dalius Gilvydis	
> University of Washington
> Department of Environmental Engineering and Science
> Box 352700
> Seattle, WA  98195-2700
> Office: 206-543-6272
> Fax:    206-685-9185
> ____________________________________________________
> 
> 
> 
> 




.