You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Clonal Reproduction and Polyploidy in Unisexual Hybrids of Phoxinus eos and Phoxinus neogaeus (Pisces; Cyprinidae)
Robert M. Dawley, R. Jack Schultz and Kathryn A. Goddard
Vol. 1987, No. 2 (May 13, 1987), pp. 275-283
Stable URL: http://www.jstor.org/stable/1445762
Page Count: 9
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Hybrids between Phoxinus eos and P. neogaeus are common, can occur in the absence of one parent species, and are almost exclusively female. Analyses of hybrids from eight localities in eastern North America indicate that these hybrids constitute a unisexual hybrid species. Tissue grafts among diploid hybrids from East Inlet, Coos Co., New Hampshire are accepted, indicating these unisexuals are genetically identical, and must be the products of clonal reproduction. Chromosome counts and isozyme banding patterns reveal the presence of both diploid and triploid hybrids at all eight localities. Gene dosage shown by electrophoretic analysis indicates that both eos × eos × neogaeus triploids and eos × neogaeus × neogaeus triploids exist. The three hybrid biotypes, one diploid and the other two triploid, are designated P. eos-neogaeus, P. 2 eos-neogaeus, and P. eos-2 neogaeus, respectively.