Abstract
This study compared the ichthyofaunal assemblages in 10 Eastern Cape Province, South Africa, estuaries to identify whether there were any structural variations between the assemblages and to determine the environmental and physical factors linked to these variations. Species belonging to both the marine migrant and estuarine resident groups, by consistent representation within each estuary grouping, were responsible for the separation of fish assemblage structures between the different types of systems. The data further revealed that fish assemblages in the three main types of estuaries investigated were distinct, linked primarily to estuary mouth status and estuary size.
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References cited
Bennett, B.A. 1989. A comparison of the fish communities in nearby permanently open, seasonally open and normally closed estuaries in the south-western cape, South Africa. S. Afr. J. Mar. Sci. 8: 43–55.
Bennett, B.A., K.C.D. Hamman, G.M. Branch & S.C. Thorne. 1985. Changes in the fish fauna of the Bot River Estuary in relation to opening and closure of the estuary mouth. Trans. R. Soc. S. Afr. 45: 449–464.
Blaber, S.J.M. & A.K. Whitfield. 1976. Large scale mortality of fish at St Lucia. S. Afr. J. Sci. 72: 218.
Black, C.A. 1965. Methods of Soil Analysis, Part 1, Physical and Mineralogical Properties, Including Statistics of Measurement and Sampling. American Society of Agronomy, Wisconsin.
Colloty, B.M. 2000. The Botanical Importance Rating of the Estuaries of Ciskei/Transkei. Ph.D. thesis, University of Port Elizabeth, Port Elizabeth. 230pp.
Cowley, P.D. 1998. Fish Population Dynamics in a Temporarily Open/Closed South African Estuary. Ph.D. thesis, Rhodes University, Grahamstown. 145pp.
Cowley, P.D. & A.K. Whitfield. 2001. Fish population size estimates from a small intermittently open estuary in South Africa, based on mark-recapture techniques. Mar. Freshw. Res. 52: 283–290.
Cyrus, D.P. 1992. Turbidity gradients in two Indo-Pacific estuaries and their influence on fish distribution. S. Afr. J. Aquat. Sci. 18: 51–63.
Cyrus, D.P. & S.J.M. Blaber. 1987. The influence of turbidity on juvenile marine fish in the estuaries of Natal, South Africa. Cont. Shelf Res. 7: 1411–1416.
Cyrus, D.P. & S.J.M. Blaber. 1992. Turbidity and salinity in a tropical northern Australian estuary and their influence on fish distribution. Est. Coast. Shelf Sci. 35: 545–563.
Cyrus, D.P. & S. Mclean. 1996. Water temperature and the 1987 fish kill at lake St Lucia on the south eastern coast of Africa. S. Afr. J. Aquat. Sci. 22: 105–110.
Forbes, A.T. & D.P. Cyrus. 1993. Biological effects of salinity gradient reversals in a southeast African estuarine lake. Neth. J. Aquat. Ecol. 27: 483–488.
Griffiths, S.P. & R.O. West. 1999. Preliminary assessment of shallow water fish in three small intermittently open estuaries in south-eastern Australia. Fish. Manag. Ecol. 6: 311–321.
Hanekom, N. & D. Baird. 1984. Fish community structure in Zostera and non-Zostera regions of the Kromme estuary, St Francis Bay. S. Afr. J. Zool. 19: 295–301.
Kok, H.M. & A.K. Whitfield. 1986. The influence of open and closed mouth phases on the marine fish fauna of the Swartvlei estuary. S. Afr. J. Zool. 21: 309–315.
Russell, I.A. 1996. Fish Abundance in the Wilderness and Swartvlei lake systems: Changes relative to environmental factors. S. Afr. J. Zool. 31: 1–9.
Ter Morshuizen, L.D. & A.K. Whitfield. 1994. The distribution of littoral fish associated with eelgrass Zostera capensis beds in the Kariega estuary, a Southern African system with a reversed salinity gradient. S. Afr. J. Mar. Sci. 14: 95–105.
Vorwerk, P.D., A.K. Whitfield, P.D. Cowley & A.W. Paterson. 2001. A survey of selected Eastern Cape estuaries with particular reference to the ichthyofauna. Ichthyol. Bull. Smith Inst. Ichthyol. 72: 1–52.
Wallace, J.H. 1975. The estuarine fishes of the east coast of South Africa. Part IV. Occurrence of juveniles in estuaries. Part V. Ecology, estuarine dependence and status. Invest. Rep. Oceanogr. Res. Inst. 42: 63.
Wallace, J.H., H.M. Kok, L.E. Beckley, B. Bennett, S.J.M. Blaber & A.K. Whitfield. 1984. South African estuaries and their importance to fishes. S. Afr. J. Sci. 80: 203–207.
Walsh, J.H., D.S. Peters & D.P. Cyrus. 1999. Habitat utilization by small flatfishes in a North Carolina estuary. Estuaries 22: 803–813.
Whitfield, A.K. 1986. Fish community structure response to major habitat changes within the littoral zone of an estuarine coastal lake. Env. Biol. Fish. 17: 41–51.
Whitfield, A.K. 1998. Biology and ecology of fishes in southern African estuaries. Ichthyol. Monogr. Smith Inst. Ichthyol. 2: 1–223.
Whitfield, A.K. & H.M. Kok. 1992. Recruitment of juvenile marine fishes into permanently open and seasonally open estuarine systems on the southern coast of South Africa. Ichthyl. Bull. Smith Inst. Ichthyol. 57: 1–39.
Whitfield, A.K., L.E. Beckley, B.A. Bennett, G.M. Branch, H.M. Kok, I.C. Potter & R.P. van der Elst. 1989. Competition, species richness and similarity of Ichthyofaunas in eelgrass Zostera capensis beds of southern Africa. S. Afr. J. Mar. Sci. 8: 251–259.
Whitfield, A.K., A.W. Paterson, A.H. Bok & H.M. Kok. 1994. A comparison of the ichthyofaunas in two permanently open eastern Cape estuaries. S. Afr. J. Zool. 29: 175–185.
Young, G.C., I.C. Potter, G.A. Hyndes & S. De Lestang. 1997. The ichthyofauna of an intermittently open estuary: Implications of bar breaching and low salinities on faunal composition. Est. Coast. Shelf Sci. 45: 53–68.
Zar, J.H. 1996. Biostatistical analysis. Prentice-Hall International, London.
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Vorwerk, P.D., Whitfield, A.K., Cowley, P.D. et al. The Influence of Selected Environmental Variables on Fish Assemblage Structure in a Range of Southeast African Estuaries. Environmental Biology of Fishes 66, 237–247 (2003). https://doi.org/10.1023/A:1023922521835
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DOI: https://doi.org/10.1023/A:1023922521835