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A Distinctive Chromosomal Race of the Cyprinodontid Fish, Fundulus notatus, from the Upper Tombigbee River System of Alabama and Mississippi

Ann Black and W. Mike Howell
Copeia
Vol. 1978, No. 2 (May 5, 1978), pp. 280-288
DOI: 10.2307/1443564
Stable URL: http://www.jstor.org/stable/1443564
Page Count: 9
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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.
A Distinctive Chromosomal Race of the Cyprinodontid Fish, Fundulus notatus, from the Upper Tombigbee River System of Alabama and Mississippi
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Abstract

Fundulus notatus and F. olivaceus are sibling species which have diploid chromosome numbers of 40 and 48 respectively. However, populations of F. notatus analyzed from the Upper Tombigbee River system of Alabama and Mississippi exhibit a strikingly different karyotype. The Tombigbee population of F. notatus has a modal diploid count of 44, which is intermediate between F. olivaceus and other populations of F. notatus analyzed. Phenotypically and ecologically, the Tombigbee population is essentially identical to other populations of F. notatus. Therefore, the Tombigbee population of F. notatus is considered to represent a variant or chromosomal race of F. notatus. The karyotype of the Tombigbee race could have originated either independently, or through natural hybridization, or by a mechanism involving Robertsonian rearrangements of chromosomes.

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