Publication Date:
2019-07-17
Description:
Recently, a hitherto unknown feeding strategy, the toxic mucus trap, was discovered in the dinoflagellate
Alexandrium pseudogonyaulax. In this study, over 40 strains of 8 different Alexandrium species (A.
ostenfeldii, A. tamarense, A. catenella, A. taylorii, A. margalefii, A. hiranoi, A. insuetum and A.
pseudogonyaulax) were screened for their ability to ingest prey and/or to form mucus traps. The mucus
trap feeding strategy, where a mucus trap is towed by the longitudinal
flagellum remains unique to A.
pseudogonyaulax. In additional experiments, details of the trap were examined and quantified, such as
speed and frequency of trap formation as well as what happens to the trap after the A. pseudogonyaulax
cell detaches from it. The percentage of A. pseudogonyaulax cells producing a mucus trap and the number
of prey cells caught increased with increasing prey concentration, whereas the physical size of the traps
was independent of prey concentration. In one strain given an excess of prey, within 1 h over 90% of
individual A. pseudogonyaulax cells had formed a trap, each containing an average of 45 prey cells.
Individual A. pseudogonyaulax cells steadily produced traps and up to 5 traps were produced by a single A.
pseudogonyaulax cell after only 24 h. The attachment of an A. pseudogonyaulax cell to the trap only ceased
during, and just following, cell division. Prey cells were, to some extent, capable of escaping from the
mucus trap, but the trap remained sticky and continued catching prey for up to 48 h after the trap had
been abandoned by the A. pseudogonyaulax cell. These results reveal that the effects of the mucus trap
extend far beyond the removal of prey through ingestion, and the potential impact of this strategy on
surrounding cells is high.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
,
isiRev
Format:
application/pdf
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