Title page for ETD etd-07212010-020405

Type of Document Master's Thesis
Author Elder, John Franklin
URN etd-07212010-020405
Title Chromosomal complements and variation in some Venezuelan annual killifishes (cyprinodontidae)
Degree Master of Science
Department Zoology
Advisory Committee
Advisor Name Title
Turner, Bruce J. Committee Chair
Andrews, Robin M. Committee Member
Thomerson, Jamie E. Committee Member
Wallace, Bruce Committee Member
  • Cyprinodontidae
Date of Defense 1988-05-05
Availability restricted

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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