134 



Rc'inHc.s liud Amphihuins — Our Liviii}^ Rcstntires 



Fig. 3. Historical and current distribution of the mountain yellow-legged frog, and presumed 

 native populations of the nonhem leopard frog in California based on 2.565 museum records and 

 673 records from other sources. Dots indicate locality records based on verified museum speci- 

 mens. Squares indicate locality records based on venfied sightings (e.g.. field notes, photographs, 

 published papers). Red dots and green squares denote localities where native frogs are extant. 

 Gold dots and blue squares indicate where native frogs are presumed extinct. Figure modified 

 from Jennings and Hayes ( 1993). 



the eastern part of California (Fig. 3). Some 

 populations were introduced into the state with- 

 in the past 100 years (Jennings and Hayes 

 1993). most around the turn of the century 

 (Storer 1925). This species has disappeared 

 from about 95% of its range in California and is 

 now found only in one national wildlife refuge 

 near the Oregon border. Most localities where 

 this frog was historically found have not 

 changed appreciatively during the past 50 years, 

 so the reasons for the species' decline and dis- 

 appearance remain a mystery. 



For further information: 



Mark R. Jennings 

 National Biological Service 



Alaska Science Center 



Piedras Blancas Field Station 



PO Box 70 



San Simeon, CA 93452 



References 



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 and introduced fishes in the high Sierra Nevada lakes of 

 California: implication of the negative effects of fish 

 introductions. Copeia l989(3):775-778. 



Bradford. D.F. 1991. Mass mortality and extinction in a 

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Bradford, D.F. D.M. Graber, and F Tabatabai. 1993. 

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Federal Register 1994. Endangered and threatened wildlife 

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Jennings. M.R.. and M.P. Hayes. 1994. Decline of native 

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