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Missouri River Basin
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Last modified
4/8/2013 5:26:26 PM
Creation date
3/6/2013 1:04:48 PM
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Water Supply Protection
Description
related to the Platte River Endangered Species Partnership (aka Platte River Recovery Implementation Program or PRRIP) Technical Advisory Committee (TAC) Meeting - Pallid Sturgeon
State
CO
WY
NE
MO
Basin
South Platte
Water Division
1
Author
CWCB Staff
Title
Staff comments on the US Fish and Wildlife's Biological Opinion on the Missouri River Main Stem Reservoir System, Operation and Maintenance of the Missouri River Bandk Stabilization and Navigation Project, and the Operation o fthe Kansas River Reservoir
Water Supply Pro - Doc Type
Report/Study
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petitioned for endangered status. The pallid sturgeon's similar appearance to the more common <br />shovehnose sturgeon has led some to conclude that they are members of the same species. Since the <br />pallid sturgeon was listed in 1990, however, geneticists and ichthyologists have worked to refine testing <br />procedures and develop the materials to definitively determine the status of these two fish species_�trt�Y . <br />Several earlier studies, including work completed by Forbes and Richardson (1905), Bailey and Cross <br />(1954) and Carlson and Pflieger (1981), attempted to use various meristic, morphological and physical <br />characteristics to identify the distinguishing characteristics of the pallid sturgeon. Forbes and <br />Richardson (1905) first identified the characteristics of the pallid sturgeon from eight specimens from <br />the Mississippi River at the mouth of the Illinois River. Local fisherman had noticed that some sturgeon, <br />locally called white sturgeon or switch -tail, appeared to be different from the more common shovelnose <br />sturgeon. Bailey and Cross (1954) compared 35 measurements and seven plate and fm -ray counts for <br />the pallid and shovelnose sturgeon and found: <br />"Although the album and platorynchus are readily separable and are well - marked species, it is clear <br />that they are closely related and share several fundamental distinctions from the other recent <br />acipenserids." <br />Carlson and Pflieger (198 1) developed a character index using four counts and ten measurements to <br />differentiate between the pallid, shovelnose, and suspected hybrids. Comparisons were also made <br />using tissue samples from 10 pallid sturgeon, 74 shovelnose sturgeon, and 6 presumed hybrids. Tissue <br />samples were identical at all 52 loci examined using electrophoresis; no statistically significant <br />differences were found at three polymorphic loci examined. They concluded that the similarities suggest <br />a close relationship, but, given the many phenotypic differences, they were still surprised by the <br />similarities . <br />In less than half the pallid sturgeon range where hybridization has not been observed or is minimal (MT, <br />ND), obvious morphological differences exist between pallid and shovelnose sturgeon. Krentz (1996) <br />developed a character index that uses six morphological characteristics to differentiate between the two <br />species and makes field identification easy in the North Dakota/Montana range of the population. <br />Sheehan et al. (1999) also developed a character index that was applied to Mississippi River pallid <br />sturgeon and found the populations of pallid sturgeon in the lower Missouri River and the Mississippi <br />River appear to have much hybridization, thus complicating identities. Campton (1987) stated that <br />detecting hybrids through use of morphological and meristic characteristics has many shortcomings and <br />can only provide circumstantial evidence of hybridization. He also stated that if hybridization has <br />proceeded beyond the first generation . distinguishing individuals of mixed ancestry is often impossible. <br />By 1994, several studies had been conducted which attempted to differentiate the pallid and shovelnose <br />sturgeon using genetic analyses. Phelps and Allendorf (1983) and Genetic Analyses, Inc. (1994) <br />compared sequences of segments of the mitochondrial DNA (mtDNA) cytochrome b gene. None of <br />the studies detected significant genetic differences between pallid and shovelnose sturgeon, but suffered <br />96 Status Range Wide -PS <br />Ob � V,,,� <br />J651- tf Ake <br />
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