4.7 Article

From lipophilic to hydrophilic toxin producers: Phytoplankton succession driven by an atmospheric river in western Patagonia

Journal

MARINE POLLUTION BULLETIN
Volume 193, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2023.115214

Keywords

Pseudo-nitzschia calliantha; Lipophilic toxins; Amnesic shellfish poisoning; Domoic acid; Hydro -climatic modulation; Patagonian fjord system

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Phytoplankton succession in the Patagonian Fjord System is modulated by atmosphericoceanographic forcing. During austral summer, the marine dinoflagellate Dinophysis acuta is replaced by the diatom Pseudo-nitzschia calliantha in a stratified water column. This transition is accompanied by a change in biotoxin profiles induced by the arrival of an intense atmospheric river.
Phytoplankton succession is related to hydroclimatic conditions. In this study we provide the first description of a toxic phytoplankton succession in the Patagonian Fjord System. The shift was modulated by atmosphericoceanographic forcing and consisted of the replacement of the marine dinoflagellate Dinophysis acuta in a highly stratified water column during austral summer by the diatom Pseudo-nitzschia calliantha in a mixed water column during late summer and early autumn. This transition, accompanied by a change in the biotoxin profiles (from lipophilic dinophysis toxins to hydrophilic domoic acid), was induced by the arrival of an intense atmospheric river. The winds in Magdalena Sound may have been further amplified, due to its west-east orientation and its location within a tall, narrow mountain canyon. This work also documents the first known appearance of toxic P. calliantha in Northern Patagonian. The potential impacts of the biotoxins of this species on higher trophic levels are discussed.

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