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Environmental Biology of Fishes

, Volume 1, Issue 2, pp 113–125 | Cite as

Geographic variation of Barbus radiatus Peters, a widely distributed African cyprinid fish

  • Donald J. Stewart
Main article

Synopsis

Barbus radiatus is a widely distributed, polytypic species with three recognized subspecies: radiatus Peters (1853), aurantiacus Boulenger (1910), and profundus Greenwood (1970). A phenetic analysis of relative similarity was conducted for specimens of B. radiatus from throughout its known range. The study focuses on several large population samples taken recently along the presumed central Zambian interface between the subspecies aurantiacus and radiatus. New data on meristic and morphometric variation in B. radiatus and recent rediscovery of typical radiatus in Lake Victoria demonstrate that profundus is a species distinct from radiatus. With respect to the remaining two subspecies, results indicate a populational mosaic of highly variable morphs rather than two discrete, allopatric morphs. Thus, aurantiacus is placed in synonymy of radiatus. It is hypothesized that the populational mosaic of morphology in radiatus reflects adaptive ecotypic responses to water temperature and current velocity. The characters which accounted for most of the geographic variation of radiatus were body depth, caudal peduncle length, longitudinal meristic counts, dorsal fin height, and orbit diameter.

Keywords

Africa Barbus Cyprinidae Ecotypic Fish Geographic variation Phenetics Principal components Systematics 

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References cited

  1. Bailey, R. G. 1969. The non-cichlid fishes of the eastward flowing rivers of Tanzania, East Africa. Rev. Zool. Bot. afr. 80: 170–199.Google Scholar
  2. Banister, K. E. 1973. A revision of the large Barbus (Pisces, Cyprinidae) of East and Central Africa. Studies on African Cyprinidae Part II. Bull. Br. Mus. nat. Hist. (Zool.) 26: 1–148.Google Scholar
  3. Barlow, G. W. 1961. Causes and significance of morphological variation in fishes. Syst. Zool. 10: 105–117.Google Scholar
  4. Barnard, K. H. 1941. Note on alleged viviparity in Barbus viviparus and description of a new species of Beirabarbus. Ann. mag. nat. Hist. (8) 8: 469–471.Google Scholar
  5. Bell-Cross, G. 1965. Additions and amendments to the check list of the fishes of Zambia. The Puku 3: 29–43.Google Scholar
  6. Bell-Cross, G. 1968. The distribution of fishes in Central Africa. Fish. Res. Bull. Zambia 4: 3–20.Google Scholar
  7. Bell-Cross, G. 1972. The fish fauna of the Zambezi River system. Arnoldia (Rhodesia) 5: 1–19.Google Scholar
  8. Boulenger, G. A. 1904. Diagnoses of three new species of Barbus from Lake Victoria. Ann. mag. nat. Hist. (7) 13: 449–450.Google Scholar
  9. Boulenger, G. A. 1905. On a collection of fishes from Lake Bangweolo. Ann. mag. nat. Hist. (7) 16: 642–647.Google Scholar
  10. Boulenger, G. A. 1910. On a large collection of fishes made by Dr. W. J. Ansorge in the Quanza and Bengo Rivers, Angola. Ann. mag. nat. Hist. (8) 6: 537–561.Google Scholar
  11. Boulenger, G. A. 1911. Catalogue of the Fresh-water Fishes of Africa in the British Museum (Natural History). 2. London, 527 pp.Google Scholar
  12. Crass, R. S. 1960. Notes on the freshwater fishes of Natal with descriptions of four new species. Ann. Natal Mus. 14: 405–458.Google Scholar
  13. Farquharson, F. L. 1962. The distribution of cyprinids in South Africa. Ann. Cape prov. Mus. 2: 233–251.Google Scholar
  14. Fowler, J. A. 1970. Control of vertebral number in teleosts—an embryological problem. Quart. Rev. Biol. 45: 148–167.Google Scholar
  15. Goldstein, A. 1964. Biostatistics: An Introductory Text. The MacMillan Company, New York, 272 pp.Google Scholar
  16. Greenwood, P. H. 1962. A revision of certain Barbus species (Pisces, Cyprinidae) from East, Central and South Africa. Bull. Br. Mus. nat. Hist. (Zool.) 8: 151–208.Google Scholar
  17. Greenwood, P. H. 1963. Notes on Barbus radiatus Peters 1853 and the subgenus Beirabarbus in East, South and Central Africa. Rev. Zool. Bot. afr. 67: 20–28.Google Scholar
  18. Greenwood, P. H. 1970. A revision of the cyprinid species Barbus (Enteromius) radiatus Peters, 1853, with a note on the synonymy of the subgenera Beirabarbus and Enteromius. Rev. Zool. Bot. afr. 82: 1–13.Google Scholar
  19. Herre, A. W. 1936. A new cyprinid genus and species and a new characin from Portuguese East Africa. Proc. Biol. Soc. Wash. 49: 99–101.Google Scholar
  20. Hopson, A. J. & J. Hopson. 1965. Barbus (Pisces, Cyprinidae) of the Volta region. Bull. Br. Mus. nat. Hist. (Zool.) 13: 1–149.Google Scholar
  21. Hubbs, C. L. 1922. Variations in the number of vertebrae and other meristic characters of fishes correlated with the temperature of the water during development. Am. Nat. 56: 360–372.Google Scholar
  22. Hubbs, C. L. 1926. The structural consequences of modifications of the developmental rate in fishes considered in reference to certain problems of evolution. Am. Nat. 60: 57–81.Google Scholar
  23. Hubbs, C. L. 1941. The relation of hydrological conditions to speciation in fishes. pp. 182–195. In: A symposium on hydrobiology, Univ. Wis. Press, Madison, 416 pp.Google Scholar
  24. Jordan, D. S. 1891. Relations of temperature to vertebrae among fishes. Proc. U.S. Nat. Museum 14: 107–120.Google Scholar
  25. Jubb, R. A. 1967. Freshwater Fishes of South Africa. A. A. Balkema, Cape Town, 248 pp.Google Scholar
  26. Jubb, R. A. 1968. The Barbus and Varicorhinus species (Pisces, Cyprinidae) of Transvaal. Ann. Transv. Mus. 26: 79–97.Google Scholar
  27. Ladiges, W. 1964. Beiträge zur Zoogeographie und Oekologie der Süsswasserfische Angolas. Mitt. Hamburg. Zool. Mus. Inst. 61: 221–272.Google Scholar
  28. Morrison, D. F. 1967. Multivariate Statistical Methods. McGraw-hill, Inc., New York, 338 pp.Google Scholar
  29. Peters, W. C. 1853. Eine nachträgliche Mittheilung über die Süsswasserfische von Mossambique. Ber. dt. Akad. Wiss. Berl. 1853:783.Google Scholar
  30. Ricker, W. E. 1973. Linear regressions in fishery research. J. Fish. Res. Board Can. 30: 409–434.Google Scholar
  31. Smith, G. R. 1966. Distribution and evolution of the North American catostomid fishes of the subgenus Pantosteus, genus Catostomus. Misc. Publ. Mus. Zool., Univ. Michigan 129: 1–132.Google Scholar
  32. Smith, G. R. 1973. Analysis of several hybrid cyprinid fishes from Western North America. Copeia 1973. 395–410.Google Scholar
  33. Smith, G. R., & R. K. Koehn. 1971. Phenetic and cladistic studies of biochemical and morphological characteristics of Catostomus. Syst. Zool. 20: 282–297.Google Scholar
  34. Sokal, R. R., & F. J. Rohlf. 1969. Biometry: the principles and practice of statistics in biological research. W. H. Freeman and Company, San Francisco, 776 pp.Google Scholar
  35. Trewavas, E., & D. J. Stewart. 1975. A new species of Tilapia (Pisces, Cichlidae) in the Zambian Zäire system. Bull. Br. Mus. nat. Hist. (Zool.) 28: 191–197.Google Scholar

Copyright information

© Dr. W. Junk b.v., Publishers 1977

Authors and Affiliations

  • Donald J. Stewart
    • 1
  1. 1.School of Natural Resources and Museum of ZoologyThe University of MichiganAnn ArborUSA

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