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High levels of genetic subdivision of marine and estuarine populations of the estuarine catfishCnidoglanis macrocephalus (Plotosidae) in southwestern Australia

Abstract

The cobblerCnidoglanis macrocephalus (Valenciennes) is an endemic marine and estuarine catfish from southern Australia. Conflicting views on the degree of isolation of the estuarine populations underscore general questions about genetic divergence in coastal species. Although estuaries are widely recognized as ecologically important, little work has been done on their role in favouring genetic divergence. In order to estimate the extent of genetic subdivision among nearshore marine and estuarine populations, electrophoretic variation of enzymes was examined in seven marine and six estuarine populations of cobbler from sites spanning 1500 km along the southwest Australian coastline. Among all populations, the mean standardized variance in allelic frequencies (F ST) for six polymorphic loci was 0.277, a high value comparable to those of other shallow-water teleosts whose life-history characteristics and habitat preferences restrict their dispersal capability. The pattern of genetic identities between populations showed divergence between west and south coast sites. Within these regional groups, however, there was substantial heterogeneity, much of which was associated with estuaries. Among all six estuarine sites, the averageF ST was 0.333, 40% higher than the value of 0.237 for the marine sites. Low estimates of the genetically effective number of migrants suggest population subdivision between marine and estuarine environments and between similar habitat types. This study indicates the importance of habitat in affecting the connectedness of populations, even in apparently open marine systems.

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References

  1. Brewer, G. J. (1970). An Introduction to isozyme techniques. Academic Press, New York

    Google Scholar 

  2. Burton, R. S., Feldman, M. W. (1982). Population genetics of coastal and estuarine invertebrates: does larval behavior influence population structure? In: Kennedy, V. S. (ed.) Estuarine comparisons. Academic Press, New York, p 537–551

    Google Scholar 

  3. Cronin, L. E., Mansueti, A. J. (1971). The biology of the estuary. In: Douglas, P. A., Stroud, R. H. (eds.) A symposium on the biological significance of estuaries. Sport Fishing Institute, Washington, D. C., p. 14–39

    Google Scholar 

  4. Day, J. H., Blaber, S. J. M., Wallace, J. H. (1981). Estuarine fishes. In: Day, J. H. (ed) Estuarine ecology with particular reference to South Africa. Balkema, Rotterdam, p. 197–221

    Google Scholar 

  5. Gyllensten, U. (1985). The genetic structure of fish: differences in the intraspecific distribution of biochemical genetic variation between marine, anadromous, and freshwater species. J Fish Biol. 26:691–699

    Google Scholar 

  6. Hodgkin, E. P., Clark, R. (1988). Estuaries and coastal lagoons of south western Australia. An inventory. No. 3. Wilson Inlet, Irwin Inlet and Parry Inlet. Estuar. Stud. Ser. envirl Protect. Auth., Perth 3:1–42

    Google Scholar 

  7. Hodgkin, E. P., Lenanton, R. C. (1981). Estuaries and coastal lagoons of south-western Australia. In: Nelson, B. J., Cronin, L. E. (eds.) Nutrient enrichment in estuaries. Humana Press, Clifton, New Jersey, p. 307–321

    Google Scholar 

  8. Hosoya, K. (1988). Plotosidae. In: Okiyama, M. (ed.) An atlas of the early stage fishes in Japan. Tokay University Press, Tokyo, p. 167–168 [In Jap.]

    Google Scholar 

  9. Johnson, M. S., Creagh, S., Moran, M. (1986) Genetic subdivision of stocks of snapper,Chrysophrys unicolor, in Shark Bay, Western Australia. Aust. J. mar. Freshwat. Res. 37:337–345

    Google Scholar 

  10. Kowarsky, J. (1975). An ecological study of the estuarine catfish,Cnidoglanis macrocephalus. Ph. D. thesis. University of Western Australia, Nedlands, W. A.

    Google Scholar 

  11. Kowarsky, J. (1976). Clarification of the name and distribution of the plotosid catfish,Cnidoglanis macrocephalus. Copeia 1976: 593–594

    Google Scholar 

  12. Lake, J. S. (1967). Rearing experiments with five species of Australian freshwater fishes. II. Morphogenesis and ontogeny. Aust. J. mar. Freshwat. Res. 18:155–173

    Google Scholar 

  13. Laurenson, L. J. B., Neira, F. J., Potter, I. C. (1993). Reproductive biology and larval morphology of the marine plotosidCnidoglanis macrocephalus (Teleostei) in a seasonally closed Australian estuary. Hydrobiologia (in press)

  14. Lenanton, R. C., Caputi, N. (1989). The roles of food supply and shelter in the relationship between fishes, in particularCnidoglanis macrocephalus (Valenciennes), and detached macrophytes in the surf zone of sandy beaches. J. exp. mar. Biol. Ecol. 128:165–176

    Google Scholar 

  15. Lenanton, R. C., Potter, I. C. (1987). Contributions of estuaries to commercial fisheries in temperate Western Australia and the concept of estuarine dependence. Estuaries 10:28–35

    Google Scholar 

  16. Moriuchi, S., Dotsu, Y. (1973). The spawning and the larval rearing of the sea catfish,Plotosus anguillaris. Bull. Fac. Fish. Nagasaki Univ. 36:7–12

    Google Scholar 

  17. Nei, M. (1978). Estimation of average heterozygosity and genetic distance from a small number of individuals. Genetics, Austin, Tex. 89:583–590

    Google Scholar 

  18. Nel, S. A., Potter, I. C., Loneragan, N. R. (1985) The biology of the catfishCnidoglanis macrocephalus (Plotosidae) in an Australian estuary. Estuar., cstl Shelf Sci. 21:859–909

    Google Scholar 

  19. Orr, T. M., Milward, N. E. (1984). Reproduction and development ofNeosilurus ater (Perugia) andNeosilurus hyrtlii Steindachner (Teleostei: Plotosidae) in a tropical Queensland stream. Aust. J. mar. Freshwat. Res. 35:187–195

    Google Scholar 

  20. Palumbi, S. R. (1992) Marine speciation on a small planet Trends Ecol. Evol. 7:114–118

    Google Scholar 

  21. Potter, I. C., Ivanstoff, W., Cameron, R. Minnard, J. (1986). Life cycles and distribution of atherinids in the marine and estuarine waters of southern Australia. Hydrobiologia 139:23–40

    Google Scholar 

  22. Reynolds, J., Weir, B. S., Cockerham, C. C. (1983). Estimation of the coancestry coefficient: basis for a short term genetic distance. Genetics, Austin, Tex 105:767–779

    Google Scholar 

  23. Richardson, B. J., Baverstock, P. R., Adams, M. (1986). Allozyme electrophoresis. Academic Press, Sydney, N. S. W.

    Google Scholar 

  24. Selander, R. K., Smith, M. H., Yang, S. H., Johnson, W. E., Gentry, J. B. (1971) Biochemical polymorphism and systematics in the genusPeromyscus. I. Variation in the old-field mouse (Peromyscus polionotus). Stud. Genet. Austin, Tex. 6:49–90

    Google Scholar 

  25. Shaklee, J. B. (1983). The utilization of isozymes as gene markers in fisheries management and conservation. Isozymes. Curr. Topics biol. med. Res. 11:213–247

    Google Scholar 

  26. Shaklee, J. B., Allendorf, F. W., Morizot, D. C., Whitt, G. S. (1990). Gene nomenclature for protein-coding loci in fish. Trans. Am. Fish. Soc. 119:2–15

    Google Scholar 

  27. Smith, P. J., Fujio, Y. (1982). Genetic variation in marine teleosts: high variability in habitat specialists and low variability in habitat generalists. Mar. Biol. 69:7–20

    Google Scholar 

  28. Swofford, D. L., Selander, R. B. (1981) BIOSYS-1: a FORTRAN program for the comprehensive analysis of electrophoretic data in population genetics and systematics. J. Hered. 72:281–283

    Google Scholar 

  29. Waples, R. S. (1987) A multispecies approach to the analysis of gene flow in marine shore fishes. Evolution 41:385–400

    Google Scholar 

  30. Watts, R. J. (1991) The effects of estuaries and islands on the genetic structure of marine inshore fishes. Ph. D. thesis. University of Western Australia, Nedlands

    Google Scholar 

  31. Weir, B. S., Cockerham, C. C. (1984) EstimatingF-statistics for the analysis of population structure. Evolution 38:558–574

    Google Scholar 

  32. Workman, P. L., Niswander, J. D. (1970) Population studies on southwestern Indian tribes. II. Local genetic differentiation in the Papago. Am. J. hum. Genet. 22:24–29

    Google Scholar 

  33. Wright, S. (1943). Isolation by distance. Genetics, Princeton 28: 114–138

    Google Scholar 

  34. Wright, S. (1978) Evolution and the genetics of populations. Vol. 4. Variability within and among natural populations. University of Chicago Press, Chicago, Illinois

    Google Scholar 

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Communicated by G. F. Humphrey, Sydney

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Ayvazian, S.G., Johnson, M.S. & McGlashan, D.J. High levels of genetic subdivision of marine and estuarine populations of the estuarine catfishCnidoglanis macrocephalus (Plotosidae) in southwestern Australia. Mar. Biol. 118, 25–31 (1994). https://doi.org/10.1007/BF00699216

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Keywords

  • Standardize Variance
  • South Coast
  • Regional Group
  • Coast Site
  • Genetic Identity