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dc.contributor.authorElder, John Franklinen
dc.date.accessioned2014-03-14T21:41:02Zen
dc.date.available2014-03-14T21:41:02Zen
dc.date.issued1988-05-05en
dc.identifier.otheretd-07212010-020405en
dc.identifier.urihttp://hdl.handle.net/10919/43853en
dc.description.abstractKaryotypes 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.en
dc.format.extentv, 53 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.publisherVirginia Techen
dc.relation.isformatofOCLC# 18585255en
dc.relation.haspartLD5655.V855_1988.E423.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.E423en
dc.subject.lcshCyprinodontidaeen
dc.subject.lcshKillifishesen
dc.titleChromosomal complements and variation in some Venezuelan annual killifishes (cyprinodontidae)en
dc.typeThesisen
dc.contributor.departmentZoologyen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineZoologyen
dc.contributor.committeechairTurner, Bruce J.en
dc.contributor.committeememberAndrews, Robin M.en
dc.contributor.committeememberThomerson, Jamie E.en
dc.contributor.committeememberWallace, Bruceen
dc.type.dcmitypeTexten
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212010-020405/en
dc.date.sdate2010-07-21en
dc.date.rdate2010-07-21en
dc.date.adate2010-07-21en


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