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dc.contributor.authorElder, John Franklinen_US
dc.date.accessioned2014-03-14T21:41:02Z
dc.date.available2014-03-14T21:41:02Z
dc.date.issued1988-05-05en_US
dc.identifier.otheretd-07212010-020405en_US
dc.identifier.urihttp://hdl.handle.net/10919/43853
dc.description.abstract

Karyotypes of nine species of Venezuelan annual killifishes were compared. Karyotypic differences were found between species and between some genera.

A chromosomal sexual dimorphism was found in Pterolebias hoignei (2N = 46). Males of this species possess a single large "Y" chromosome. No chromosomal divergence was detected among conspecific populations from different localities. Pterolebias hoignei and Pterolebias zonatus were found to differ both in diploid number (46 and 42 respectively) and in metacentric chromosome number (6 and 12 respectively).

All Rachoviaspecies were found to have a diploid number of 44. Rachovia maculipinnisand R. brevis were found to differ from one another in metacentric chromosome number (20 and 12 respectively). Rachovia hummelincki and R. pyropunctata both possess metacentric chromosome counts of 10.

No karyotypic differences were found between Austrofundulus transilis and Austrofundulus limnaeus (2N = 44, metacentrics = 12). Several populations of the latter although divergent in male color patterns, did not differ karyotypically. All species examined, except Rivulus stellifer, departed from the presumptive ancestral teleost diploid number of 48. The degree of chromosomal variation appears not to be as high among the New World as among the Old World annuals. This difference among lineages with similar life histories and reproductive strategies suggests that stochastic events have not played a major role in mediating chromosomal divergence in annual fishes.

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dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1988.E423.pdfen_US
dc.subjectCyprinodontidaeen_US
dc.subject.lccLD5655.V855 1988.E423en_US
dc.titleChromosomal complements and variation in some Venezuelan annual killifishes (cyprinodontidae)en_US
dc.typeThesisen_US
dc.contributor.departmentZoologyen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineZoologyen_US
dc.contributor.committeechairTurner, Bruce J.en_US
dc.contributor.committeememberAndrews, Robin M.en_US
dc.contributor.committeememberThomerson, Jamie E.en_US
dc.contributor.committeememberWallace, Bruceen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212010-020405/en_US
dc.date.sdate2010-07-21en_US
dc.date.rdate2010-07-21
dc.date.adate2010-07-21en_US


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