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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 7:27:44 PM
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UCREFRP
UCREFRP Catalog Number
9443
Author
Bestgen, K. R., G. B. Haines, R. Brunson, T. Chart, M. Trammell, R. T. Muth, G. Birchell, K. Chrisopherson and J. M. Bundy.
Title
Status of Wild Razorback Sucker in the Green River Basin, Utah and Colorado, Determined From Basinwide Monitoring and Other Sampling Programs.
USFW Year
2002.
USFW - Doc Type
Project Number 22D,
Copyright Material
NO
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1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />We used Pradel's survival and population rate of change model in program MARK for <br />the full 1980 to 1999 data set to estimate ~., the population rate of change. The most reasonable <br />candidate model had constant ~, and ~ and time-varying p. Survival rate was estimated at 0.69 <br />(SE 0.021) and ~, = 0.91 (SE = 0.014). This suggested an average overall population decline <br />from the joint effects of emigration, immigration, recruitment, and mortality of about 9% per year <br />during the period 1980 to 1999. A 9% decline per year would be the interpretation of a lambda <br />value of 0.91 because a value of 1.0 (1.0 - 0.91 = 0.09, or 9%) indicates no change in the <br />population rate of change. Another candidate model with time varying ~, was not interpreted <br />because estimates from the early 1980's were unreasonably small or large (>200,000). <br />Other adult fish sampling, 1996-1999.- Relatively few wild adult fish were captured in <br />other areas of the Green River basin. Only two were captured in the lower Yampa River and two <br />were captured in the lower Green River during Basinwide sampling. Four stocked fish were <br />captured in the lower Green River during that time. <br />Larvae, middle Green River.-During Basinwide sampling in 1996 to 1999, larvae were <br />sampled with light traps in both the middle and lower Green River reaches. In the middle Green <br />River, a total of 20,844 fish in 15 taxa were captured in light-trap samples from 1996 to 1999 <br />(Table 5). Of those, 10,048 (48.2 %) were native catostomids (included all unidentified fish), <br />and 247 (1.2 %) were razorback sucker larvae. We consider only native catostomids in these <br />analyses because abundance of the only other catostomid captured, introduced white sucker <br />Catostomus commersoni, was low in all years. In 1999, the 121aivae captured were sent to <br />Ouray National Fish Hatchery for possible rearing and use as brood stock. All other specimens <br />were discarded so information for other taxa was not available. Capture rates of catostomid <br />16 <br /> <br />
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