SciELO - Scientific Electronic Library Online

vol.103 issue5-6Antimicrobial activity of rare actinomycetes isolated from natural habitats in KwaZulu-Natal, South AfricaA theory of quantitative trend analysis and its application to South African general elections author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand



Related links

  • On index processCited by Google
  • On index processSimilars in Google


South African Journal of Science

On-line version ISSN 1996-7489
Print version ISSN 0038-2353


STEPHEN, Vanessa C.  and  HOCKEY, Philip A.R.. Evidence for an increasing incidence and severity of Harmful Algal Blooms in the southern Benguela region. S. Afr. j. sci. [online]. 2007, vol.103, n.5-6, pp.223-231. ISSN 1996-7489.

Harmful Algal Blooms (HABs) may lead to catastrophic mortality over a range of trophic levels and impact on fisheries, local species' populations, conservation management and the health of both livestock and humans. Consequently, any increase in frequency and/or toxicity of these events is of concern. Recently this concern has been realized, with reported increases in the frequency of HABs from all continents except Antarctica. This reported rise is supported by data from the Benguela coast of western South Africa, where, since 1930, there has been a significant increase in the frequency of HABs and a slight increase in their average severity. There has been a sixfold increase in the number of HABs per decade since the 1960s, with the period 1990-2005 experiencing the greatest number of blooms, as well as the most severe in terms of associated mortality. The recent occurrence of previously unrecorded HAB-causing species in this region may go some way to explaining this trend, and further implies that the increase is unlikely to diminish in the near future.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License