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2022-12-19_GENERAL DOCUMENTS - C1981010
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2022-12-19_GENERAL DOCUMENTS - C1981010
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Last modified
12/20/2022 1:58:51 PM
Creation date
12/20/2022 10:30:12 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
12/19/2022
Doc Name Note
Section 7 Consultation.
Doc Name
Correspondence
From
Clayton Creed
To
DRMS
Email Name
RAR
JLE
Media Type
D
Archive
No
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1800 <br /> *Colorado pikeminnow <br /> 1600 <br /> ■Northern pike <br /> N 1400 <br /> v <br /> m <br /> 1200 <br /> N <br /> W <br /> 01 ■ <br /> C 100❑ <br /> lC <br /> C <br /> 7 <br /> 4 800 ■ <br /> 600 <br /> c <br /> 0 <br /> a <br /> 400 <br /> 200 ♦ O <br /> 0 <br /> 2000 2002 2004 2006 2008 2010 2012 2014 <br /> Figure 7. Comparison of Colorado pikeminnow population estimates (CPM) (2000 —2008 data <br /> from Bestgen et al. 2010) and northern pike (Battige 2012) in the middle Yampa River. The <br /> 2011-2013 data points for Colorado pikeminnow are preliminary. Northern pike population <br /> estimates were not conducted in 2013. <br /> As stated in Martinez et al. (2014), the dramatic decline of native fishes in the Yampa River <br /> provides a stark example of the cumulative detrimental impacts of an increase in the number and <br /> abundance of nonnative aquatic species,particularly increases in the range and abundance of <br /> invasive species including northern pike and smallmouth bass, and virile crayfish Orconectes <br /> virilis. The Yampa River has been previously described as the "crown jewel" of the upper <br /> Colorado River Basin due to its formerly robust native fish populations (Johnson et al. 2008) and <br /> its comparatively unregulated hydrograph. It contains designated critical habitat for all four of <br /> the endangered fish in the basin. In recent decades, the Yampa River has been progressively <br /> invaded by nonnative species, altering the native aquatic community and food web and <br /> increasing the threat of invasive impacts to native and endangered fishes (Johnson et al. 2008; <br /> Martinez 2014). Examples of these threats include the detection of Asian tapeworm <br /> Bothriocephalus acheilognathi, hybridization between native sucker species and nonnative white <br /> sucker Catostomus commersoni, and predation or apparent competition with and hyperpredation <br /> on native and endangered fishes (Martinez 2014). Endangered Colorado pikeminnow have <br /> steadily declined in the Yampa River, despite pikeminnow increases in four other major <br /> population areas in the Green River basin (Bestgen et al. 2010; Martinez et al. 2014). It has <br /> become imperative that preventive, eradication and control measures be diligently,vigorously, <br /> and more rapidly applied to restore the native aquatic community in the Yampa River(Martinez <br /> et al. 2014). <br /> 36 <br />
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