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WSP09017
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Last modified
1/26/2010 2:50:41 PM
Creation date
10/12/2006 3:24:37 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.10.L
Description
UCRBRIP Newsletters/Brochures
Basin
Colorado Mainstem
Date
9/1/1996
Author
UCRBRIP
Title
Recovery Program Newsletter Fall 1996
Water Supply Pro - Doc Type
Publication
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<br /> <br /> <br />.-'. .......;. ~ ~.. _ Pho.to.by' Greg Corte <br />Kathy Holley of the Bureau of Reclamation and Frank Pfeifer of the. U.S.' Fish . <br />and Wildlife Service team up to: take spawn from an .endangered razorback . <br />sucker. Holley uses a sCanner: to read an electronic tag implanted in the fish.. .' <br />. .. . <br />. . .. . ... <br /> <br />. . <br />Fish tested for selenium contamination <br /> <br />from overfloWing its banks and flood- <br />ing surrounding ar~s: . ' . <br />. Wetland losses in the upper basin,. <br />reach irito the tens' of thousands of <br />acres, said Pat Nelson, who coordinates. . <br />the flood plain restoration project <br />, In the Grand Valley, irrigation' <br />leaches the element from the soil' and <br />, carries it to the Colorado. River and <br />adjacent wetlands., Selenium. accumu-. . <br />lates in the tissues of organisms living <br />in contamiriated water. Fish that live in . <br />selenium:contaminated wat~r and reed <br />on'organisms from . that. water. can. . <br />develbpvery highselenium lev~ls. <br />.. The-selenium 'experiment. IS <br />designed in pm to determin.e thi,- cont- <br />. arriination levels, that impair raZorback. <br />larVae survival. " , . . '. <br />The Fish and Wildlife Service has <br />completed' an inventory of potential <br />. flood plain restoration sites. Biologists' <br />ani now sorting out the, best sites for <br />restoration efforts, and seleniuin cont- <br />amination is a limiting factor. : <br />. Three Grand Valley sites are beirig <br />sfudied for selenium: a pond at Walter <br />Walker State Wildlife Area- th'e most. <br />hea;"iiy contaminated' of, the sites .--:-" a <br />side' channel' of the Colorado River <br />near Adobe Creek and p'onds at Horse- <br />thief Canyon State Wildlife Area. <br /> <br />Determining the impact of selenium . <br />contamination on razOrback.suckers is' <br />the goal of a study being conducted by <br />biologists with' the U.s Fish and <br />Wildlife Service, ,Bureau . of <br />, Reclamation, and National Biological <br />Service iri western Colorado, . . <br />. The agencies plan to restore certain . <br />flood plain areas that 'once provided <br />havens for young rnzorbacks. But many <br />potential siies are contaminated With . <br />selenium, a naturally occurrmg element: ' <br />The scientists will analyze the' seienium <br />content bftlie fish eggs and larvae. <br />Animals require 'selenium in. trace <br />amoimts, But irihigh concentrations,.it . <br />can kill all larVae, scientists say. . . <br />Wetlands 'provide habitat for YOUlig <br />fish, offering, warril water,' abundant <br />food andsubmergedveg~tation; where, <br />fry can hide from predator,s., These <br />same areas can benefit peopie by filter- <br />ing water pollutants, controlling flood- <br />ing and providing homes. to hundreds <br />of species of wildlife.' , . <br />But much flood plain habitat has <br />disappeared over the last century, <br />Water' development .projects have <br />reduced flows on the Colorado andi!s <br />major tributaries by at least one-third, <br />Dams, levees 'and other flood-control <br />structures often prevent the Colorado . <br /> <br />6 <br />
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