Current distribution and potential expansion of the harmful benthic dinoflagellate Ostreopsis cf. siamensis towards the warming waters of the Bay of Biscay, North‐East Atlantic

Type Article
Date 2021-09
Language English
Author(s) Drouet Kevin1, 2, Jauzein Cecile2, Hervio Heath Dominique3, Hariri Saeed2, Laza‐martinez A.ORCID4, 5, Lecadet Cyrielle6, Plus MartinORCID2, Seoane S.4, 5, Sourisseau Marc2, Lemée R.1, Siano RaffaeleORCID2
Affiliation(s) 1 : Sorbonne Université, CNRS - Laboratoire d’Océanographie de Villefranche (UMR 7093) – Villefranche-sur-mer 06230, France
2 : Ifremer, DYNECO – F-29280 Plouzané, France
3 : Ifremer PFOM – F-29280 Plouzané, France
4 : Department of Plant Biology and Ecology - University of the Basque Country UPV/EHU – Leioa 48940, Spain
5 : Research Centre for Experimental Marine Biology and Biotechnology (Plentzia Marine Station, PiE- UPV/EHU) – Plentzia 48620, Spain
6 : Ifremer, LGPMM – F-17390 La Tremblade, France
Source Environmental Microbiology (1462-2912) (Wiley), 2021-09 , Vol. 23 , N. 9 , P. 4956-4979
DOI 10.1111/1462-2920.15406
WOS© Times Cited 8
Note Special Issue on Pathogen and Antibiotic Resistance Ecology
Abstract

In a future scenario of increasing temperatures in North‐Atlantic waters, the risk associated with the expansion of the harmful, benthic dinoflagellate Ostreopsis cf. siamensis has to be evaluated and monitored. Microscopy observations and spatio‐temporal surveys of environmental DNA (eDNA) were associated with Lagrangian particle dispersal simulations to: i) establish the current colonization of the species in the Bay of Biscay, ii) assess the spatial connectivity among sampling zones that explain this distribution, iii) identify sentinel zones to monitor future expansion. Throughout a sampling campaign carried out in August‐September 2018, microscope analysis showed that the species develops in the south‐east of the bay where optimal temperatures foster blooms. Quantitative PCR analyses revealed its presence across almost the whole bay to the western English Channel. An eDNA time‐series collected on plastic samplers showed that the species occurs in the bay from April to September. Due to the water circulation, colonization of the whole bay from the southern blooming zones is explained by inter‐site connectivity. Key areas in the middle of the bay permit continuous dispersal connectivity towards the north. These key areas are proposed as sentinel zones to monitor O. cf. siamensis invasions towards the presumably warming water of the North‐East Atlantic.

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Drouet Kevin, Jauzein Cecile, Hervio Heath Dominique, Hariri Saeed, Laza‐martinez A., Lecadet Cyrielle, Plus Martin, Seoane S., Sourisseau Marc, Lemée R., Siano Raffaele (2021). Current distribution and potential expansion of the harmful benthic dinoflagellate Ostreopsis cf. siamensis towards the warming waters of the Bay of Biscay, North‐East Atlantic. Environmental Microbiology, 23(9), 4956-4979. Publisher's official version : https://doi.org/10.1111/1462-2920.15406 , Open Access version : https://archimer.ifremer.fr/doc/00676/78819/