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<br /> <br />54 <br /> <br />GREAT BASIN NATURALIST MEMOIRS <br /> <br />19' <br /> <br />than 50 individuals in July 1968. This low <br />population size persisted through January <br />1969 (Fig. 12), but by August 1971, when a <br />transplant was made into Com Creek Spring, <br />the population had recovered significantly. <br />In August 1975, Manse Spring failed as a re- <br />sult of excessive pumping of groundwater in <br />the area (Soltz and Naiman 1978). <br />Prior to making the killifish transplant into <br />Corn Creek Spring the population of in- <br />troduced largemouth bass and mosquitofish <br />(Gambusia affinis) was removed. A few mos- <br />quitofish escaped the final poisoning efforts <br />in Corn Creek Spring, but by November <br />1973 the original stocking of 29 killifish had <br />built a population of about 1300. In addition, <br />mosquitofish had become extremely abun- <br />dant. By November 1974 approximately 250 <br />killifish were estimated to occur in Corn <br />Creek Spring. The population had not in~ <br />creased by July 1975. In April 1976, 165 kill- <br />ifish were removed from the spring and it <br />was poisoned in a second effort to remove <br /> <br />1200 <br /> <br />o TOTAL CAPTURE <br />o MARK AND RECAPTURE <br />· CATCH PER TRAP HOUR <br /> <br />1100 <br /> <br />1000 <br /> <br />900 <br /> <br />800 <br /> <br />700 <br /> <br />600 <br /> <br />500 <br /> <br />400 <br /> <br />Goldfilh <br />INTRODUCTION <br /> <br />300 <br /> <br />200 <br /> <br />100 <br /> <br />1961 <br /> <br />1962 1963 <br /> <br />1964 1965 <br /> <br />Fig. 12. Changes in population size of Pahrump killifish 1961-1968. <br /> <br />1967 1968 <br /> <br />mosquitofish. The' effort was successful and <br />killifish had built an estimated population of <br />2000 fish by November 1976 and 2500 by <br />October 1977. <br />These data show that on two occasions in <br />Manse Spring a population increase of gold- <br />fish was accompanied by a marked popu- <br />lation decline of Pahrump killfish, and on one <br />occasion in Com Creek Spring a population <br />increase of mosquitofish was accompanied by <br />a killifish population decline. A cause-effect <br />relationship is strongly suggested, perhaps re- <br />lating to competitive interactions of the <br />young or predation. <br /> <br />No.3 <br /> <br />an <br /> <br />SCl <br />an <br />thl <br />tio <br />tel <br />4). <br /> <br />RESTRICTED RANGE <br /> <br />ml <br />in <br />po <br />w~ <br />rei <br />th, <br />of <br />tal <br />cr, <br />ac <br /> <br />While many western fishes have extremely <br />restricted ranges, none is so restricted or iso- <br />lated as the Devils Hole pupfish, Cyprinodon <br />diabolis. A discussion of the biology of this <br />species and description of its habitat are pres- <br />ented by Soltz and Naiman (1978). Deacon <br /> <br />1966 <br /> <br />Gold filii R...tobli.hed <br /> <br /> <br />~ <br /> <br />