The use of stable isotopes to measure the ingestion rate of potentially toxic benthic dinoflagellates by harpacticoid copepods

Abstract

et al.. The use of stable isotopes to measure the ingestion rate of 1 potentially toxic benthic dinoflagellates by harpacticoid copepods. Journal Abstract 20 2 Phycotoxins synthesized by benthic dinoflagellates are known to bioaccumulate in 21 macrofauna and hence represent a risk for human health. However, the presence of toxins 22 synthesized by benthic dinoflagellates in smaller marine organisms than macrofauna has not 23 been considered despite the fact that such small organisms have an important ecological role 24 in the benthic food web. This present study quantified, for the first time, the trophic 25 relationship between benthic dinoflagellates and meiofauna by using stable isotope enriched 26 dinoflagellates during ingestion experiments. Results showed that harpacticoid copepods were 27 not able to discriminate, during ingestion, between the potentially toxic cells of Ostreopsis cf. 28 ovata and the non-toxic cells of Amphidinium cf. carterae, even when another food resource, 29 such as diatoms (e.g. Odontella sp.), was provided (Kruskal Wallis test, p > 0.05). 30 31 Introduction 32

Exploring the Role of Macroalgal Surface Metabolites on the Settlement of the Benthic Dinoflagellate Ostreopsis cf. ovata

“…propinquus, have been recently shown to feed on O. cf. ovata (Prato et al, 2011;Faimali et al, 2012;Furlan et al, 2013;Pavaux et al, 2019) with similar ingestion rates as for diatoms (Boisnoir et al, 2020). The resistance of benthic copepods to O. cf.…”

Recombinase-aided amplification combined with lateral flow dipstick for the rapid detection of Amphidinium carterae

“…The proliferation of A. carterae often triggers outbreaks of HABs. The single-species toxic effects of A. carterae, being an important species in the marine food chain, would be detrimental to the entire ecosystem (Boisnoir et al 2020) and could even cause negative economic impacts on fisheries, aquaculture, and tourisms. Thus, monitoring the presence and abundance of this microalgal species in the marine environment is crucial.…”

“…HABs initiated by A. carterae cause serious economic losses to fisheries in the adjacent sea area and destroy the ocean environment (Lee et al 2003;Pagliara and Caroppo 2012). With similar eco-physiological characteristics to most benthic toxic dinoflagellates, the toxins produced by A. carterae can accumulate in large animals and transfer them throughout the food chain (Accoroni et al 2020;Boisnoir et al 2020). In recent decades, many researchers have devoted close attention to the toxicity of A. carterae (Ismael et al 1999;Echigoya et al 2005;Lauritano et al 2017), suggesting that mass mortalities of fish are associated with multiple toxins produced by A. carterae.…”

Chemical Ecology of the Benthic Dinoflagellate Genus Ostreopsis: Review of Progress and Future Directions

“…Octopuses also accumulated more than 446 µg•kg −1 (Milandri et al, 2010) suggesting a bioaccumulation of toxins among the trophic web which might have played a role in the ecosystem suffering with stranding of octopuses. However, mussels and other predators such as copepods have already been demonstrated as a vector for toxin transfer through both benthic and planktonic food webs (Furlan et al, 2013;Boisnoir et al, 2020).…”