Abstract
Marine planktonic copepods are important grazers on harmful algae (HA) species of phytoplankton, and copepods are major entry points for vectorial intoxication of pelagic food webs with HA toxins. Previous reviews (Turner and Tester, 1997; Turner et al., 1998a; Turner, 2006) summarized information on HA interactions with zooplankton grazers, and vectorial intoxication of pelagic food webs, up through approximately 2005. Accordingly, this review will address primarily studies published during the last decade. It will concentrate on generic issues in the developing field of HA:grazer interactions, such as the extent to which HA toxins serve as copepod grazing deterrents, induction of HA grazing deterrents by exposure to copepods, copepod selective feeding to avoid ingesting HA taxa versus non-selective feeding on HA taxa, possible biogeographic aspects of the effects of HA toxins on copepods, impact of copepod grazing on HA bloom development and termination, the role of copepods as entry points for vectorial intoxication of pelagic food webs with HA toxins, and possible reasons and remedies for the highly-variable and conflicting results reported for many studies of copepod grazing on various HA species.
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