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Can domoic acid affect escape response in copepods?

Sara Harðardóttir1, Bernd Krock2, Sylke Wohlrab3

  • 1Natural History Museum of Denmark, University of Copenhagen, Øster Farimagsgade 5, 1307 Copenhagen K Denmark.

Harmful Algae
|November 14, 2018
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Summary

Toxic phytoplankton harm marine life. This study shows the neurotoxin domoic acid (DA) impairs copepod escape responses, impacting marine food webs. Further research is needed on DA

Keywords:
CalanusDomoic acidEscape jumpsPseudo-nitzschia

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Area of Science:

  • Marine Biology
  • Ecotoxicology
  • Chemical Ecology

Background:

  • Copepods are crucial grazers of toxic phytoplankton.
  • Phytoplankton toxins can affect marine food webs.
  • Copepod survival depends on predator evasion.

Purpose of the Study:

  • To investigate the impact of domoic acid (DA) on copepod escape responses.
  • To test if DA produced by Pseudo-nitzschia affects planktonic copepod behavior.

Main Methods:

  • Experimental exposure of arctic copepods (Calanus hyperboreus and C. glacialis) to DA-producing diatoms.
  • Observation and quantification of copepod escape responses.
  • Analysis of DA accumulation in copepods.

Main Results:

  • Both Calanus species showed reduced escape responses after consuming DA-producing diatoms.
  • Calanus hyperboreus was more sensitive to DA, showing effects with shorter exposure and less intake.
  • The negative impact on escape response was not correlated with accumulated DA levels.

Conclusions:

  • Domoic acid (DA) can impair the escape behavior of arctic copepods.
  • DA may function as an anti-grazing mechanism for phytoplankton.
  • Further research is essential to understand DA's behavioral effects and toxicity mechanisms in marine ecosystems.