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Last modified
7/14/2009 5:01:44 PM
Creation date
5/22/2009 12:32:37 PM
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UCREFRP
UCREFRP Catalog Number
7031
Author
Deacon, J. E.
Title
Endangered and Threatened Fishes of the West
USFW Year
1979
USFW - Doc Type
Great Basin Naturalist Memoirs
Copyright Material
YES
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<br /> <br /> <br />1979 <br /> <br />. <br /> <br />THE ENDANGERED SPECIES: A SYMPOSIUM <br /> <br />51 <br /> <br />70 <br /> <br />. above nor rows <br />o below narrows <br /> <br />00 <br /> <br />o <br /> <br />50 <br /> <br />40 <br /> <br />. <br /> <br />o <br /> <br />. <br /> <br />o <br /> <br />100 200 300 400 500 600 700 800 900 1000 1100 <br />.MEAN SPRING FLOW (CFS) <br /> <br />Fig. 9. Mean spring flows in Virgin River related to mean size of woundfin in the following fall. Data are from <br />1973, 1977, 1978. Mean spring flow is the average of the monthly means for April, May, and June. <br /> <br />waters were invaded by mollies at different <br />times; in any case, the Crenichthys popu- <br />lation did not appear to either sustain or re- <br />flect any permanent damage from parasitism. <br />Other populations for which historical data <br />are not so extensive but which, through 1966, <br />were not subjected to stress from nonnative <br />fishes occur at Mormon Spring and Preston <br />Big Spring (Table 3). In addition, while gup- <br />pies Poecilia reticulata have been in Preston <br />. Town Spring since sometime before 1961 <br />(Deacon et aI. 1964), we have seen no in- <br />dication of parasitism by Lernea (Table 3). Of <br />course, the population was not examined im- <br />mediately after introduction of Poecilia. <br />Figure 11 illustrates changes in incidence <br />of parasitism by Lernea for populations <br /> <br />TABLE 3 continued. <br /> <br />which became rare or extinct In Ash Spring, <br />mosquitofish were not present in 1946 (Miller <br />and Alcorn 1946) but were present in 1959 <br />(Miller and Hubbs 1960). In March 1963, <br />Poecilia was not present, but P. latipinna, P. <br />mexicana, and Cichlasoma nigrofasciatum <br />were present and breeding on 3 June 1964. <br />They have since remained abundant in Ash <br />Spring and its warm outflow stream. In- <br />cidence of parasitism by Lernea on C. baileyi <br />was significant for the first timme in 1964 <br />and remained so in 1965. The C. baileyi pop- <br />ulation in this limnocrene declined in abun- <br />dance and remains extremely rare today. The <br />increase in parasitism closely followed in- <br />troduction of the exotics and was followed by <br />a dramatic decline in abundance of the na- <br /> <br />1951 1954 1959 1960 1961 1962 1963 1964 1965 1966 <br />N % N % N % N % N % N % N % N % N %N % <br /> <br /> 19 0 920 5.1 11 9.1 68 0 238 14 15 o 1259 0 253 0 <br /> 90 10 224 9 5 0 <br />110 0 11 0 4 0 16 25 16 0 2828 .04 356 0 <br /> 101 0 82 0 69 0 313 20 27 59 <br /> 159 o 1051 0 188 0 <br /> 25 0 5 0 25 0 <br />117 0 17 0 20 0 704 0 440 0 <br />
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