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Extinction-prone sunfish and suckers identified

e extinction prone suckers, on the other hand, are primarily found in the Western United States. The robust species, in contrast, are found all over North America.

When he graphed the species characteristics as part of his study, the Penn State researcher noted that one extinct sucker did not appear on the graph in the same location with the other extinction prone species. The existence of the "outlier" indicates to him that there could be an additional group of sunfish and suckers that are also extinction prone.

Pyron's findings were detailed in the Journal of Biogeography last year. Data for the study were drawn from Page and Burr's Field Guide to Fresh Water Fishes of North America. Pyron took the range size maps from the guide, digitized them and calculated the areas. The guide also contains the information on body sizes and habitat that Pyron used.

The 13 species of sunfish and suckers identified as extinction prone in Pyron's study:

SUNFISH
Roanoke Bass -- found in Virginia and North Carolina.
Ozark Rock Bass -- found only in Arkansas and Southern Missouri.
Sacramento Perch -- found only in California. There are attempts to introduce it in Nevada.
Red Eyed Bass -- found in northern Alabama and Northern Georgia.
Suwannee Bass -- found only in the Suwnanee River and Ochlockonee Rivers in Florida.
Guadeloupe Bass -- found in the Guadeloupe and San Antonia Rivers near Austin, Texas.

SUCKERS
Modoc Sucker -- found in three streams that drain into the Pit River in Northern California.
Owens Sucker -- found in the Owens River in Central California.
Yaqui Sucker -- found in the Yaqui and Rio Rivers in Arizona and Mexico.
Lost River Sucker -- found in the Klamath and Agency Lakes in Oregon and some northern California Lakes and reservoirs.
West Mexican Redhorse Sucker -- found on the Pacific Coast of Mexico.
Cu-ui Sucker -- found in Pyramid Lake Nevada.
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Contact: Barbara Hale
bah@psu.edu
814-865-9481
Penn State
13-Apr-2000


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