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Predator lipids induce paralytic shellfish toxins in bloom-forming algae

Journal article
Authors Erik Selander
Julia Kubanek
M. Hamberg
Mats X. Andersson
Gunnar Cervin
Henrik Pavia
Published in Proceedings of the National Academy of Sciences of the United States of America
Volume 112
Issue 20
Pages 6395-6400
ISSN 0027-8424
Publication year 2015
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Department of Biological and Environmental Sciences
Pages 6395-6400
Language en
Links dx.doi.org/10.1073/pnas.1420154112
Keywords lipid signaling, Alexandrium, inducible defense, harmful algal bloom, paralytic shellfish toxin, MARINE-PHYTOPLANKTON, HPLC METHOD, TAURINE, GRAZER, DAPHNIA, DIATOM, CELLS, CHAIN, SEA, Multidisciplinary Sciences
Subject categories Ecology

Abstract

Interactions among microscopic planktonic organisms underpin the functioning of open ocean ecosystems. With few exceptions, these organisms lack advanced eyes and thus rely largely on chemical sensing to perceive their surroundings. However, few of the signaling molecules involved in interactions among marine plankton have been identified. We report a group of eight small molecules released by copepods, the most abundant zooplankton in the sea, which play a central role in food webs and biogeochemical cycles. The compounds, named copepodamides, are polar lipids connecting taurine via an amide to isoprenoid fatty acid conjugate of varying composition. The bloom-forming dinoflagel-late Alexandrium minutum responds to pico- to nanomolar concentrations of copepodamides with up to a 20-fold increase in production of paralytic shellfish toxins. Different copepod species exude distinct copepodamide blends that contribute to the species-specific defensive responses observed in phytoplankton. The signaling system described here has far reaching implications for marine ecosystems by redirecting grazing pressure and facilitating the formation of large scale harmful algal blooms.

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