My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8117
CWCB
>
UCREFRP
>
Public
>
8117
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 11:27:48 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8117
Author
Modde, T. and G. Smith.
Title
Flow Recommendations for Endangered Fishes in the Yampa River.
USFW Year
1995.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
81
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />Humpback chub <br /> <br />Humpback chub appear to spawn following the seasonal peak flow at <br />temperatures of about 190 C. Seasonally high flows are important in <br />constructing and maintaining shoreline eddy habitats used by humpback chub <br />throughout the year. <br /> <br />Spring Recommendations <br /> <br />Spring peak flows are associated with reproductive activities of all the target <br />endangered species occupying the Yampa River. Spring peak flows of the <br />Yampa River connect floodplain habitats thus providing seasonal bottomland use <br />by endangered fishes in both the Yampa and Green rivers. The decline of <br />razorback sucker may be due to the loss of floodplain habitat in the low gradient <br />reaches of the Green River and Yampa rivers. Evidence also su9gel?ts that high <br />flows impede establishment of exotic fish species, particularly in canyon bound <br />reaches of the Yampa River. <br /> <br />Spring high flows transport sediments and that are delivered downstream to <br />nursery habitat sites for Colorado squawfish in the middle Green River. High <br />flows are also implicated in reducing encroachment of the introduced salt cedar, <br />and exotic plant that competes with native riparian vegetation. Given the needs <br />for high spring flows the Service recommends that existing flows (minus the <br />baseline depletion) be provided for the recovery of endangered fishes in the <br />Yampa River.. <br /> <br />Summer (June 22 - September 22) <br /> <br />Colorado squawfish <br /> <br />A gradual decline in summer flows following spring scouring of cobble <br />substrates provides an environment that facilitates spawning, incubation, larval <br />emergence, and downstream drift of larvae, as well as, enhance growth and <br />development of embryos and larvae. High spring flows help to create <br />downstream nursery areas, but these habitats are maintained as productive fish <br />habitats by declining flows. Sufficient flows are necessary for return migration <br />of postspawning adults past low flow obstacles in the river channel. Variability <br />in flow among years and months should provide greater benefits to native <br />fishes, as observed in Yampa Canyon. <br /> <br />Humpback chub <br /> <br />Extremely low summer flows could adversely affect spawning and nursery <br />habitat of the humpback chub in Yampa Canyon by concentrating fishes in <br />suboptimal habitats and increasing the potential for disease, competition, <br />predation, and hybridization. Variability in flow among years should provide <br />greater benefits to native fishes, as observed in Yampa Canyon. <br /> <br />31 <br />
The URL can be used to link to this page
Your browser does not support the video tag.