Are assemblages of black bream (Acanthopagrus butcheri) in different estuaries genetically distinct?
Tóm tắt
Samples of the estuarine-spawning teleostAcanthopagrus butcheri were collected from nine estuaries and a coastal lake, located in the Pilbara and South-western drainage divisions of Western Australia and distributed along a coastline covering a distance of nearly 2,000 km. The patterns of allozyme variation in these samples were used to explore the extent to which there was variation in the genetic compositions of black bream assemblages in geographically-isolated estuarine systems, and whether or not any such variation could be related to the geographical location or type of estuary. Although only three of 36 scorable loci (Gpi-1, Ldh andMdh-2) exhibited variation that could be used for analysis, there was considerable variation in allele frequencies at these loci among the different samples (mean FST=0.166). Much of the detected variation was attributable to differences between the samples collected from the two drainage divisions, which are located in very different climatic regions. Furthermore, the genetic compositions of samples from neighbouring estuaries were typically more similar to each other than to those of samples collected from more distantly-located systems. However, the assemblages in one west coast and two south coast estuaries, that are closed to the ocean for extensive periods of time during the year, all showed very similar genetic compositions. Nevertheless, it is crucial to recognise that, pairwise comparisons of samples collected from the different estuaries, both within and between the two drainage divisions, almost invariably showed statistically significant differences in allele frequencies at one or more loci. Thus, our results indicate that the local populations of black bream in individual estuaries are genetically distinct, which is probably a consequence of both a limited movement by individuals between estuaries and the effects of differences in regional and local environmental conditions.
Tài liệu tham khảo
Allen, G.R. 1989. Freshwater fishes of Australia. TFH Publications, Neptune City, NJ.
Anon. 1993. Black Bream,Acanthopagrus butcheri. In: Fishing WA, No. 10, pp 1–4. Fisheries Department of W.A.
Ayvazian, S.G., Johnson, M.S. and McGlashan, D.J. 1994. High levels of genetic subdivision of marine and estuarine populations of the estuarine catfishCnidoglanis macrocephalus (Plotosidae) in southwestern Australia. Marine Biology 118: 25–31.
Chrystal, P.J., Potter, I.C., Loneragan, N.R. and Holt, C.P. 1985. Age structure, growth rates, movement patterns and feeding in an estuarine population of the cardinalfishApogon rueppellii. Marine Biology 85: 185–197.
Chubb, C.F., Potter, I.C., Grant, C.J., Lenanton R.C.J. and Wallace, J. 1981. Age structure, growth rates and movements of sea mullet,Mugil cephalus L., and yellow-eye mullet,Aldrichetta forsteri (Valenciennes), in the Swan-Avon river system Western Australia. Australian Journal of Marine and Freshwater Research 32: 605–628.
Dando, P.R. 1984. Reproduction in estuarine fish. In: G.W. Potts and R.J. Wootton (Eds.) Fish Reproduction Strategies and Tactics, pp. 155–170. Academic Press, London.
Haedrich, R.L., 1984. Estuarine fishes. In: B.H. Ketchum (Ed.) Ecosystems of the World 26. Estuaries and Enclosed Seas, pp. 183–207. Elsevier, Amsterdam.
Hodgkin, E.P. and Clark, R. 1987. Estuaries and Coastal Lagoons of South Western Australia. An Inventory. Wellstead Estuary. The Estuary of the Bremer River. Environmental Protection Authority, Perth, Western Australia. Estuarine Studies Series No. 1, 32 pp.
Hodgkin, E.P. and Clark, R. 1988. Estuaries and Coastal Lagoons of South Western Australia. An Inventory. Beaufort Inlet and Gordon Inlet. Environmental Protection Authority, Perth, Western Australia. Estuarine Studies Series No. 4, 32 pp.
Hodgkin, E.P. and Kendrick, G.W. 1984. The changing aquatic environment 7000BP to 1983 in the estuaries of south western Australia. In: E.P. Hodgkin (compiler) Estuarine Environments of the Southern Hemisphere, pp. 85–95. Department of Conservation and Environment, Perth.
Hutchins, B. and Swainston, R. 1986. Sea Fishes of Southern Australia. Swainston Publishing, Perth.
Kennish, M.J. 1990. Ecology of Estuaries. Volume II: Biological Aspects. CRC Press, Boca Raton, Florida.
Lenanton, R.C.J. 1977. Aspects of the ecology of fish and commercial crustaceans of the Blackwood River Estuary, Western Australia. Fisheries Research Bulletin of Western Australia 19: 1–72.
Lenanton, R.C.J. and Hodgkin E.P. 1985. Life history strategies of fish in some temperate Australian estuaries. In: A. Yanez-Arancibia (Ed.) Fish Community Ecology in Estuaries and Coastal Lagoons: Towards an Ecosystem Integration, pp. 267–284. Dr R. Unam Press, Mexico.
Morizot, D.C. and Schmidt, M.E. 1990. Starch gel electrophoresis and histochemical visualization of proteins. In: D.H. Whitmore (Ed.) Electrophoretic and Isoelectric Focusing Techniques in Fishereis Management, pp. 23–80. CRC Press, Florida.
Nei, M. 1978. Estimation of average heterozygosity and genetic distance from a small number of individuals. Genetics 89: 583–590.
Potter, I.C., Beckley, L.E., Whitfield, A.K. and Lenanton, R.C.J. 1990. Comparisons between the roles played by estuaries in the life cycles of fishes in temperate Western Australia and southern Africa. Environmental Biology of Fishes 28: 143–178.
Potter, I.C., Neira, F.J., Wise, B.S. and Wallace, J.H. 1994. Reproductive biology and larval development of the terapontidAmniataba caudavittata, including comparisons with the reproductive strategies of other estuarine teleosts in temperate Western Australia. Journal of Fish Biology 45: 57–74.
Prince, J.D. and Potter, I.C. 1983. Life cycle duration, growth and spawning times of five species of Atherinidae (Teleostei) found in a Western Australian estuary. Australian Journal of Marine and Freshwater Research 34: 287–301.
Richardson, B.J., Baverstock, P.R. and Adams, M. 1986. Allozyme Electrophoresis. A Handbook for Animal Systematics and Population Studies. Academic Press, Sydney.
Rowland, S.J. 1984. Hybridization between the estuarine fishes yellowfin breamAcanthopagrus australis (Günther) and black breamA. butcheri (Munro). Australian Journal of Marine and Freshwater Research 35: 427–440.
Smith, P.J. and Fujio, Y. 1982. Genetic variation in marine teleosts: High variability in habitat specialists and low variability in habitat generalists. Marine Biology 69: 7–20.
Sneath, P.H.A. and Sokal, R.R. 1973. Numerical taxonomy: The Principles and Practice of Numerical Classification. W.H. Freeman, San Francisco.
Spencer, R.S. 1956. Studies in Australian estuarine hydrology. II. The Swan River Estuary. Australian Journal of Marine and Freshwater Research 7: 193–253.
Sugama, K., Taniguchi, N. and Sumantadinata, K. 1989. Genetic variation and population structure of black sea bream,Acanthopagrus schlegeli, in Japan. Bulletin of Marine Science and Fisheries, Kochi University 11: 79–87.
Swofford, D.L. and Selander, R.B. 1989. BIOSYS-1 A computer program for the analysis of allelic variation in population genetics and biochemical systematics. Release 1.7. Illinois Natural History Survey, Illinois.
Thomson, J.M. 1957. The size at maturity and spawning times of some Western Australian estuarine fishes. Fisheries Research Bulletin of Western Australia 8: 1–8.
Valesini, F.J., Potter, I.C., Platell M.E. and Hyndes, G.A. 1997. Ichthyofaunas of a temperate estuary and adjacent marine embayment — implications regarding choice of nursery area and influence of environmental changes. Marine Biology 128: 317–328.
Ward, R.D., Skibinski, D.O.F. and Woodwark, M. 1992. Protein heterozygosity, protein structure and taxonomic differentiation. Evolutionary Biology 26: 73–159.
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.
Wright, S. 1978. Evolution and the Genetics of Populations: Volume 4, Variability within and Among Natural Populations. University of Chicago Press, Chicago.
Young, G.C., Potter I.C., Hyndes, G.A. and de Lestang, s. 1997. The ichthyofauna of an intermittently open estuary. Implications of bar breaching and low salinities on faunal composition. Estuarine, Coastal and Shelf Science 45: 53–68.