The seals are thought to have been exposed to domoic acid after a red tide algal bloom, which can cause brain or heart damage.
genus Pseudonitzschia, a type of diatom," Pete Strutton, a biological oceanographer at the University of Tasmania, told."Diatoms are a group of plankton . They are common in very productive parts of the ocean, like coastal upwelling regions. Cape Town is close to the large Benguela upwelling system. California and Peru are other prominent examples of upwelling systems where the phytoplankton are dominated by diatoms.
"There are some theories about it being useful for taking up nutrients. Domoic acid is a powerful mammalian "We also know from similar events that have been documented in California and New Zealand that for roughly 18 months after the event, some seals will exhibit unusual behaviors, predominantly excessively aggressive defensiveness," Glasby said."This means that their response to stress or a possible stress is to respond aggressively."
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