Abstract
Namibia's marine environment falls within the Benguela system, an eastern boundary current upwelling system in the south eastern Atlantic Ocean. Conditions within much of this environment change continuously as a consequence of the upwelling of nutrient-rich water into the surface zone. In addition, irregular anomalies in temperature, oxygen concentration and salinity occur, particularly in shelf waters. These fluctuations, which are inherent in the functioning of the Benguela system, tend to favour the persistence of few, generalist species, while at the same time high productivity supports large abundances. This trend is evident in all the major marine habitats off Namibia, where diversity is often lower than in comparable habitats in the southern Benguela system off the west coast of South Africa. Namibia's marine environment is considered 'relatively pristine', although threats to biodiversity are posed by both natural and anthropogenic phenomena.
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References
Angel, M.V. (1993) Biodiversity of the pelagic ocean. Conserv. Biol. 7, 771.
Angel, M.V. (1995) Biodiversity of the deep ocean. Biological Diversity in Tropical Marine Environments: Reviews Contributing to the Conservation of Aquatic Biodiversity and its Sustainable Use by Tropical Developing Countries. London: Overseas Development Administration of the United Kingdom of Great Britain and Northern Ireland.
Anon. (1996) Survey of the offshore and inshore horse mackerel stocks of Namibia. Surveys of the Fish Resources of Namibia. Preliminary report, cruise 3/96 of the research vessel Dr Fridtjof Nansen.
Bally, R. (1983) Intertidal zonation on sandy beaches of the west coast of South Africa. Cahiers Biol. Marine (Paris) 24, 85–103.
Barnes, R.S.K. and Hughes, R.N. (1988) An Introduction to Marine Biology, 2nd edn. London: Blackwell Scientific Publications.
Berruti, A. (1989) Resident seabirds. In Oceans of Life Off Southern Africa(A.I.L. Payne and R.J.M. Crawford, eds) pp. 257–73. Cape Town: Vlaeberg Publishers.
Best, P.B. and Ross, G.J.B. (1989) Whales and whaling. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 315–38. Cape Town: Vlaeberg Publishers.
Beyers, C.J. de B. (1994) Population size and density of the deep-sea red crab Chaceon maritae (Manning and Holthuis) off Namibia determined from tag-recapture. S. Afr. J. Mar. Sci. 14, 1–9.
Bianchi, G., Carpenter, K.E., Roux, J-P., Molloy, F.J., Boyer, D. and Boyer, H. (1993) The Living Marine Resources of Namibia. Rome: FAO.
Bolton, J.J. and Anderson, R.S. (1997) Marine vegetation. In Vegetation of Southern Africa (R.M. Cowling, D.M. Richardson and S.M. Pierce, eds) pp. 348–70. Cambridge: Cambridge University Press.
Boyd, A.J., Hewitson, J.D., Kruger, I. and Le Clus, F. (1985) Temperature and salinity trends off Namibia from August 1982 to August 1984 and their relation to plankton abundance and the reproductive success of pelagic fish. ICSEAF Collection of Scientific Papers 1, 53–8.
Boyd, A.J. and Thomas, R.M. (1984) A southward intrusion of equatorial water off northern and central Namibia in March 1984. Trop. Ocean-Atmosphere Newslett. 27, 16–7.
Boyer, D.C., Goosen, A.C., Boyer, H.J. and Coetzee, J.C. (1997) Analysis of the 1990 and 1991 Namibian pelagic fishing seasons. Madoqua (in press).
Brown, J.H. (1984) On the relationship between abundance and distribution of species. Amr. Natur. 124, 255–79.
Bustamante, R.H., Branch, G.M., Velasquez, C.R. and Branch, M. (1993) Intertidal survey of the rocky shores at the Elizabeth Bay area (Sperrgebiet, Namibia). Consultancy report. Windhoek: Consolidated Diamond Mines.
Carola, M. (1994) Checklist of the marine planktonic copepoda of southern Africa and their worldwide geographic distribution. S. Afr. J. Mar. Sci. 14, 225–53.
Chapman, P. and Shannon, L.V. (1985) The Benguela ecosystem. Part II. Chemistry and related processes. Oceanogr. Mar. Biol. Ann. Rev. 23, 183–251.
Clarke, A. (1992) Is there a latitudinal diversity cline in the sea? Trends Ecol. Evol. 7, 286–7.
Copenhagen, W.J. (1953) The periodic mortality of fish in the Walvis region. A phenomenon within the Benguela Current. Investig. Rep. Div. Sea Fish. S. Afr. 14, 1–35.
Crawford, R.J.M. and Shelton, P.A. (1981) Population trends for some southern African seabirds related to fish availability. In Proceedings of the Symposium on Birds of the Sea and Shore, 1979 (J. Cooper, ed.) pp. 15–41. Cape Town: African Seabird Group.
Crawford, R.J.M., Shannon, L.V. and Pollock, D.E. (1987) The Benguela ecosystem. Part IV. The major fish and invertebrate resources. Oceanogr. Mar. Biol. Ann. Rev. 25, 353–505.
David, J.H.M. (1989) Seals. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 288–302. Cape Town: Vlaeberg Publishers.
Donn, T.E. Jr. and Cockroft, A.C. (1989) Macrofaunal community structure and zonation of two sandy beaches on the central Namib coast, South West Africa/Namibia. Madoqua 16, 129–35.
Emanuel, B.P., Bustamante, R.H., Branch, G.M., Eekhout, S. and Odendaal, F.J. (1992) A zoo-geographic and functional approach to the selection of marine reserves on the west coast of South Africa. S. Afr. J. Mar. Sci. 12, 341–54.
Engledow, H.E. and Bolton, J.J. (1994) Seaweed alpha-diversity within the lower eulittoral zone in Namibia: the effects of wave action, sand inundation, mussels and limpets. Bot. Mar. 37, 267–76.
Engledow, H.E., Bolton, J.J. and Stegenga, H. (1992) The biogeography of the seaweed flora of Namibia. In Proceedings of the First Workshop on Sustainable Seaweed Resource Development in sub-Saharan Africa (K.E. Mshigeni, J.J. Bolton, A.T. Critchley and G. Kiangi, eds) pp. 117–30. Windhoek: K.E. Mshigeni, University of Namibia.
Estrada, M. and Marrase, C. (1987) Phytoplankton biomass and productivity off the Namibian coast. S. Afr. J. Mar. Sci. 5, 347–56.
Gaudian, G. and Medley, P.A.H. (1995) Coastal marine biological diversity. Biological Diversity in Tropical Marine Environments: Reviews Contributing to the Conservation of Aquatic Biodiversity and its Sustainable Use by Tropical Developing Countries. London: Overseas Development Administration of the United Kingdom of Great Britain and Northern Ireland.
Griffin, M. (1998) The species diversity, distribution and conservation of Namibian mammals. Biodiv. Conserv. 7, 483.
Hart, T.J. and Currie, R.I. (1960) The Benguela current. Discovery Rep. 31, 123–298.
Hockey, P.A.R. and Van Erkom Schurink, C. (1992) The invasive biology of the mussel Mytilus galloprovincionalis in southern Africa. Trans. Roy. Soc. S. Afr. 48, 123–39.
Kensley, B. and Penrith, M-L. (1980) The constitution of the intertidal fauna of rocky shores of South West Africa. Part III. The north coast from False Cape Frio to the Kunene River. Cimbebasia Ser A 5, 201–14.
Kruger, I. (1980) A checklist of South West African marine phytoplankton, with some phytogeographical relations. Fisheries Bull. S. Afr. 13, 31–53.
Kruger, I. and Boyd, A.J. (1984) Investigation into the hydrology and plankton at the surface waters off southwestern Africa in ICSEAF Divisions 1.3, 1.4 and 1.5 in 1982/83. ICSEAF Collection of Scientific Papers 11, 109–34.
Lawson, G.W., Simons, R.H. and Isaac, W.E. (1990) The marine algal flora of Namibia. Bull. Brit. Mus. Nat. Hist. (Bot.) 20, 153–68.
Le Clus, F. (1985) Effects of a warm water intrusion on the anchovy fishery in Namibia. ICSEAF Collection of Scientific Papers 12, 99–101.
Le Clus, F., Hewitson, J.D., Melo, Y.C., Cooper, R.M. and Malan, P.E. (1987) The multi-species pelagic fishery off Namibia 1982-1986 and stock assessments for pilchard and anchovy. ICSEAF Collection of Scientific Papers 14, 7–15.
Lenssen, J., Tarr, P. and Berry, H. (1991) An assessment of visitor statistics and linefishing along the Sandwich shoreline, Namib-Naukluft Park, Namibia. Madoqua 18, 33–6.
Lewis, R.I. and Beardmore, J.A. (1995) Genetics and biodiversity in tropical freshwater, estuarine, coastal and deep sea environments. Biological Diversity in Tropical Marine Environments: Re-views Contributing to the Conservation of Aquatic Biodiversity and Sustainable Use by Tropical Developing Countries. London: Overseas Development Administration of the United Kingdom of Great Britain and Northern Ireland.
Lleonart, J. and Roel, B. (1984) Analisis de las comunidades de peces y crustaceos demersales de la costa de Namibia (Atlantico Sudoriental). Investigacion Pesqueras (Barcelona) 48, 187–206.
Macpherson, E. and Roel, B.A. (1987) Trophic relationships in the demersal fish community off Namibia. S. Afr. J. Mar. Sci. 5, 585–96.
Mas-Riera, J., Lombarte, A., Gordoa, A. and Macpherson, E. (1990) Influence of Benguela upwelling on the structure of demersal fish populations off Namibia. Mar. Biol. 104, 175–82.
McLachlan, A. (1985) The ecology of two sandy beaches near Walvis Bay. Madoqua 14, 155–63.
McNaughton, S.J. and Wolf, L.L. (1970) Dominance and the niche in ecological systems. Science 167, 131–9.
MFMR (1996) Economic performance by fishery. Internal memorandum. Windhoek: Ministry of Fisheries and Marine Resources.
Moldan, A.G.S. (1989) Marine pollution. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 41–9. Cape Town: Vlaeberg Publishers.
O'Toole, M.J. and Bartholomae, C. (1995) An overview of marine environmental conditions off Namibia during 1994-1995. Proceedings of Annual Research Meeting, February 1995. Windhoek: Ministry of Fisheries and Marine Resources.
Penrith, M.J. and Kensley, B.F. (1970) The constitution of the intertidal fauna of rocky shores of South West Africa 1: Lüderitzbucht. Cimbebasia A(1) 9, 191–239.
Pillar, S.C. and Hutchings, L. (1989) Plankton. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 28–40. Cape Town: Vlaeberg Publishers.
Rex, M.A., Stuart, C.T., Hessler, R.R., Allen, J.A., Sanders, H.L. and Wilson, G.K.F. (1993) Global-scale latitudinal patterns of species diversity in the deep-sea benthos. Nature 365, 636–9.
Roel, B.A., Rucabado, J., Lloris, D. and Lleonart, J. (1985) Las comunidades de peces demersales del afloramiento de Africa occidental (Sahara y Namibia). In Simposio internacional sobre las areas de afloramiento mais importantes del oueste africano (Cabo Blanco y Benguela) (C. Bas, R. Margalef, and P. Rubies, eds) pp. 691–700. Barcelona: Instituto Investigaciones Pesqueras.
Rogers, J. and Bremner, J.M. (1991) The Benguela ecosystem. Part VII. Marine-geological aspects. Oceanogr. Mar. Biol. Ann. Rev. 29, 1–85.
Ross, G.J.B. and Best, P.B. (1989) Smaller whales and dolphins. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 303–14. Cape Town: Vlaeberg Publishers.
Sanders, H.L. (1968) Marine benthic diversity: a comparative study. Am. Natur. 102, 243–82.
Shackleton, L.Y. (1987) A comparative study of fossil fish scales from three upwelling regions. S. Afr. J. Mar. Sci. 5, 79–84.
Shackleton, L.Y. (1988) Fossil pilchard and anchovy scales-indicators of past fish populations off Namibia. Proceedings of the International Symposium on Long Term Changes in Fish Populations, 1986, pp. 55–68. Vigo.
Shannon, L.V. (1985) The Benguela ecosystem. Part I. Evolution of the Benguela, physical features and processes. Oceanogr. Mar. Biol. Ann. Rev. 23, 105–82.
Shannon, L.V. (1989) The physical environment. In Oceans of Life Off Southern Africa (A.I.L. Payne and R.J.M. Crawford, eds) pp. 12–27. Cape Town: Vlaeberg Publishers.
Shannon, L.V. and Pillar, S.C. (1986) The Benguela ecosystem. Part III. Plankton. Oceanogr. Mar. Biol. Ann. Rev. 24, 65–170.
Shannon, L.V., Boyd, A.J., Brundrit, G.B. and Taunton-Clark, J. (1986) On the existence of an El-Niño type phenomenon in the Benguela System. J. Mar. Res. 44, 495–520.
Shannon, L.V., Agenbag, J.J. and Buys, M.E.L. (1987) Large-and meso-scale features of the Angola-Benguela front. S. Afr. J. Mar. Sci. 5, 11–34.
Stander, G.H. and De Decker, A.H.B. (1969) Some physical and biological aspects of an oceanographic anomaly off South West Africa in 1963. Investig. Rep. Marine Res. Lab. S. W. Afr. 13, 1–35.
Stegenga, H., Bolton, J.J. and Anderson, R.J. (1997) Seaweeds of the South African west coast. Contrib. Bolus Herb. (in press).
Stephenson, T.A. and Stephenson, A. (1972) Life Between Tidemarks on Rocky Shores. San Francisco: W.H. Freeman and Co.
Tarr, J.G., Griffiths, C.L. and Bally, R. (1985) The ecology of three sandy beaches on the Skeleton Coast of South West Africa. Madoqua 14, 295–304.
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Sakko, A. The influence of the Benguela upwelling system on Namibia's marine biodiversity. Biodiversity and Conservation 7, 419–433 (1998). https://doi.org/10.1023/A:1008867310010
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DOI: https://doi.org/10.1023/A:1008867310010