Can domoic acid affect escape response in copepods?
Section snippets
Acknowledgements
We wish to thank the crew on Arctic Station and local hunters in Qeqertarsuaq. We thank Lumi Haraguchi for valuable help with the statistical analysis and Ditte Marie Hjort for assistance with experiments. The project is funded by Independent Research Fund Denmark, grant DFF–1323-00258 and partially financed by the Helmholtz-Gemeinschaft Deutscher Forschungszentren through the research programme “Polar regions And Coasts in the changing Earth System” (PACES II) of the Alfred Wegener
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Chemical and morphological defenses of Pseudo-nitzschia multiseries in response to zooplankton grazing
2021, Harmful AlgaeCitation Excerpt :However, a discontinuous grazing rate, i.e. a change in temporal grazing pattern, have been seen in two copepod species, C. finmarchicus and C. hyperboreus (Tammilehto et al., 2015), and in krill (Bargu and Silver 2003). An increase in grazer mortality was recently seen in a long-time study with A. tonsa (Lundholm et al. 2018), a reduction in escape response was seen in Calanus (Harðardóttir et al., 2018b), and changes in expression of genes related to cellular regulative processes and changes in metabolic pathways in Calanus (Harðardóttir et al., 2018a). We found, for the first time, a strong negative correlation between cellular DA content of P. multiseries and ingestion and/or clearance rates of Artemia nauplii (Tables 1&2).
Quantification, extractability and stability of dissolved domoic acid within marine dissolved organic matter
2019, Marine ChemistryCitation Excerpt :Very recently, it has been shown that DA levels increased in Pseudo-nitzschia by exudates of predatory copepods (Tammilehto et al., 2015). Furthermore, escape response levels of copepods decrease under a toxic Pseudo-nitzschia diet (Harðardottir et al., 2018). This strongly suggests that DA production may be involved in an inducible defence mechanism of at least some Pseudo-nitzschia species against grazing.
Species composition and toxicity of the genus Pseudo-nitzschia in Taiwan Strait, including P. chiniana sp. nov. and P. qiana sp. nov.
2019, Harmful AlgaeCitation Excerpt :Finally, cellular DA contents were significantly higher (up to 5 fold) in all treatments of P. seriata and P. obtusa strains, after induction by herbivorous copepods (Calanus finmarchicus, Centropages hamatus and Acartia tonsa), and the induced DA content correlated with copepodamide concentration, suggesting that copepodamides (a group of polar lipids excreted by copepods) are the inducing cues that triggers DA production in Pseudo-nitzschia (Lundholm et al., 2018). Carnivorous copepods do not induce toxin production, supporting the hypothesis of DA production being part of a defense mechanism (Lundholm et al., 2018), which is further strengthened by a reduction in copepod escape response after feeding on DA producing diatoms (Harðardóttir et al., 2018b). In the present study, the increase in cellular DA content was 3–4 fold in P. lundholmiae (MC4218) and 23 fold in P. multiseries (MC4177), representing a significant increase due to induction by brine shrimps.
Zooplankton Response to Harmful Algae Blooms (HABs) Species Phytoplankton
2023, Springer Proceedings in PhysicsInvestigations into the relationship between domoic acid and copepods in Scottish waters
2022, ICES Journal of Marine Science