Distinctive chemotactic responses of three marine herbivore protists to DMSP and related compounds
Güell-Bujons, Queralt (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Zanoli, Medea (Institut Mediterrani d'Estudis Avançats)
Tuval, Idan (Institut Mediterrani d'Estudis Avançats)
Calbet, Albert (Institut de Ciències del Mar)
Simó, Rafel (Institut de Ciències del Mar)

Date:	2024
Abstract:	Marine planktonic predator-prey interactions occur in microscale seascapes, where diffusing chemicals may act either as chemotactic cues that enhance or arrest predation, or as elemental resources that are complementary to prey ingestion. The phytoplankton osmolyte dimethylsulfoniopropionate (DMSP) and its degradation products dimethylsulfide (DMS) and acrylate are pervasive compounds with high chemotactic potential, but there is a longstanding controversy over whether they act as grazing enhancers or deterrents. Here, we investigated the chemotactic responses of three herbivorous dinoflagellates to point-sourced, microscale gradients of dissolved DMSP, DMS, and acrylate. We found no evidence for acrylate being a chemotactic repellent and observed a weak attractor role of DMS. DMSP behaved as a strong chemoattractor whose potential for grazing facilitation through effects on swimming patterns and aggregation depends on the grazer's feeding mode and ability to incorporate DMSP. Our study reveals that predation models will fail to predict grazing impacts unless they incorporate chemotaxis-driven searching and finding of prey.
Grants:	European Commission 834162 Agencia Estatal de Investigación PID2020-118645RB-I00 Agencia Estatal de Investigación TED2021-132886B-I00 European Commission 955910 Ministerio de Ciencia e Innovación CEX2019-000928-S Agencia Estatal de Investigación CEX2021-001198
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Chemotaxis ; Oxyrrhis ; Gyrodinium ; Karlodinium ; DMSP ; DMS ; Acrylate ; Grazing ; Microzooplankton ; Capillary assays
Published in:	The ISME Journal, Vol. 18, Num. 1 (July 2024) , art. wrae130, ISSN 1751-7370

DOI: 10.1093/ismejo/wrae130
PMID: 38995932

12 p, 2.0 MB

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