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Toxins 2019, 11(1), 37; https://doi.org/10.3390/toxins11010037

Mesoscale Dynamics and Niche Segregation of Two Dinophysis Species in Galician-Portuguese Coastal Waters

1
Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Vigo, Subida a Radio Faro 50, 36390 Vigo, Spain
2
Centro i~mar & CeBiB, Universidad de Los Lagos, 557 Puerto Montt, Chile
3
Instituto Português do Mar e da Atmosfera (IPMA), Av. Brasília, 1449-006 Lisboa, Portugal
4
CCMAR, Universidade do Algarve, Campus de Gambelas, 8005-339 Faro, Portugal
5
Instituto Español de Oceanografía (IEO), Centro Oceanográfico de A Coruña, Muelle das Ánimas s/n, 15001 A Coruña, Spain
*
Author to whom correspondence should be addressed.
Received: 1 December 2018 / Revised: 28 December 2018 / Accepted: 31 December 2018 / Published: 14 January 2019
(This article belongs to the Special Issue Dinophysis Toxins: Distribution, Fate in Shellfish and Impacts)
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Abstract

Blooms of Dinophysis acuminata occur every year in Galicia (northwest Spain), between spring and autumn. These blooms contaminate shellfish with lipophilic toxins and cause lengthy harvesting bans. They are often followed by short-lived blooms of Dinophysis acuta, associated with northward longshore transport, at the end of the upwelling season. During the summers of 1989 and 1990, dense blooms of D. acuta developed in situ, initially co-occurring with D. acuminata and later with the paralytic shellfish toxin-producer Gymnodinium catenatum. Unexplored data from three cruises carried out before, during, and following autumn blooms (13–14, 27–28 September and 11–12 October) in 1990 showed D. acuta distribution in shelf waters within the 50 m and 130 m isobaths, delimited by the upwelling front. A joint review of monitoring data from Galicia and Portugal provided a mesoscale view of anomalies in SST and other hydroclimatic factors associated with a northward displacement of the center of gravity of D. acuta populations. At the microscale, re-examination of the vertical segregation of cell maxima in the light of current knowledge, improved our understanding of niche differentiation between the two species of Dinophysis. Results here improve local transport models and forecast of Dinophysis events, the main cause of shellfish harvesting bans in the most important mussel production area in Europe. View Full-Text
Keywords: Dinophysis acuta; Dinophysis acuminata; DSP; physical–biological interactions; niche partitioning; climatic anomaly Dinophysis acuta; Dinophysis acuminata; DSP; physical–biological interactions; niche partitioning; climatic anomaly
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Díaz, P.A.; Reguera, B.; Moita, T.; Bravo, I.; Ruiz-Villarreal, M.; Fraga, S. Mesoscale Dynamics and Niche Segregation of Two Dinophysis Species in Galician-Portuguese Coastal Waters. Toxins 2019, 11, 37.

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