Bloom dynamics and life cycle strategies of two toxic dinoflagellates in a coastal upwelling system (NW Iberian Peninsula)

Bravo, Isabel; Fraga, Santiago; Figueroa, Rosa Isabel; Pazos, Yolanda; Massanet, Ana; Ramilo, Isabel

doi:10.1016/j.dsr2.2009.09.004

Cited by 65 publications

(79 citation statements)

References 35 publications

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“…Reports indicate that phytoplankton in these systems can have either autochthonous or allochthonous origins, based partially on species type (diatom versus dinoflagellate) and their relative motility (Fermin et al 1996;Bravo et al 2010). In situ growth of diatoms fueled from inwelled nutrients commonly occurs in the Rias when downwelling conditions follow an upwelling episode (Figueiras et al 2002).…”

Section: Regional Comparisonsmentioning

confidence: 99%

“…The ensuing stratification and reduced flushing tends to stimulate production that fuels a large mussel aquaculture industry (Alvarez-Salgado et al 1996). However, advection of phytoplankton from the coast also occurs during relaxation or downwelling, typically in late summer, and can include toxic red-tide-forming dinoflagellates (Bravo et al 2010;Escalera et al 2010).…”

Section: Regional Comparisonsmentioning

confidence: 99%

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Climatic and Tidal Forcing of Hydrography and Chlorophyll Concentrations in the Columbia River Estuary

Roegner

Seaton

Baptista

2010

Estuaries and Coasts

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Hydrographic patterns and chlorophyll concentrations in the Columbia River estuary were compared for spring and summer periods during 2004 through 2006. Riverine and oceanic sources of chlorophyll were evaluated at stations along a 27-km along-estuary transect in relation to time series of wind stress, river flow, and tidal stage. Patterns of chlorophyll concentration varied between seasons and years. In spring, the chlorophyll distribution was dominated by high concentrations from freshwater sources. Periods of increased stream flow limited riverine chlorophyll production. In summer, conversely, upwelling winds induced input of high-salinity water from the ocean to the estuary, and this water was often associated with relatively high chlorophyll concentrations. The frequency, duration, and intensity of upwelling events varied both seasonally and interannually, and this variation affected the timing and magnitude of coastally derived material imported to the estuary. The main source of chlorophyll thus varied from riverine in spring to coastal in summer. In both spring and summer seasons and among years, modulation of the spring/neap tidal cycle determined stratification, patterns of mixing, and the fate of (especially freshwater) phytoplankton. Spring tides had higher mixing and neap tides greater stratification, which affected the vertical distribution of chlorophyll. The Columbia River differs from the more tidally dominated coastal estuaries in the Pacific Northwest by its large riverine phytoplankton production and transfer of this biogenic material to the estuary and coastal ocean. However, all Pacific Northwest coastal estuaries investigated to date have exhibited advection of coastally derived chlorophyll during the upwelling season. This constitutes a fundamental difference between Pacific Northwest estuaries and systems not bounded by a coastal upwelling zone.

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Section: Regional Comparisonsmentioning

confidence: 99%

Section: Regional Comparisonsmentioning

confidence: 99%

Climatic and Tidal Forcing of Hydrography and Chlorophyll Concentrations in the Columbia River Estuary

Roegner

Seaton

Baptista

2010

Estuaries and Coasts

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“…The A. minutum group is proposed to comprise two phylogenetic clades, based on LSU ribotypes: the global clade (European and Australian strains), and the Pacific clade (Asian and New Zealand strains) (Hansen et al, 2003;Lilly et al, 2005). A. minutum blooms occur in shallow systems, such as estuaries, bays, lagoons, and harbors, and are frequently recurrent, a characteristic favored by the presence of resting cysts in the life cycle of this species (Giacobbe et al, 1996;Garcé s et al, 2004;Bravo et al, 2010b;Touzet et al, 2010). Further details of the life cycle, as determined in a laboratory study, showed that sexual reproduction involves more than two compatible mating types.…”

Section: Introductionmentioning

confidence: 99%

Life-cycle alternations in Alexandrium minutum natural populations from the NW Mediterranean Sea

et al. 2012

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“…In the Mediterranean Sea, the increase and expansion of A. minutum outbreaks have coincided with exploitation of the coastline that increasingly offers confined nutrientenriched waters suitable for microalgal proliferation [31,32]. Despite the dinoflagellates' preference for settling in confined environments near shore, A. minutum has an enormous natural potential of dispersal because of its capacity to grow and produce resting cysts under a wide range of environmental conditions [33]. Our approach allowed characterizing the protist A. minutum population structure and connectivity at spatial scales for the control and management of the HAB events in the Mediterranean Sea.…”

Section: Introductionmentioning

confidence: 99%

Population genetic structure and connectivity of the harmful dinoflagellateAlexandrium minutumin the Mediterranean Sea

et al. 2011

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The toxin-producing microbial species Alexandrium minutum has a wide distribution in the Mediterranean Sea and causes high biomass blooms with consequences on the environment, human health and coastal-related economic activities. Comprehension of algal genetic differences and associated connectivity is fundamental to understand the geographical scale of adaptation and dispersal pathways of harmful microalgal species. In the present study, we combine A. minutum population genetic analyses based on microsatellites with indirect connectivity (C i ) estimations derived from a general circulation model of the Mediterranean sea. Our results show that four major clusters of genetically homogeneous groups can be identified, loosely corresponding to four regional seas: Adriatic, Ionian, Tyrrhenian and Catalan. Each of the four clusters included a small fraction of mixed and allochthonous genotypes from other Mediterranean areas, but the assignment to one of the four clusters was sufficiently robust as proved by the high ancestry coefficient values displayed by most of the individuals (.84%). The population structure of A. minutum on this scale can be explained by microalgal dispersion following the main regional circulation patterns over successive generations. We hypothesize that limited connectivity among the A. minutum populations results in low gene flow but not in the erosion of variability within the population, as indicated by the high gene diversity values. This study represents a first and new integrated approach, combining both genetic and numerical methods, to characterize and interpret the population structure of a toxic microalgal species. This approach of characterizing genetic population structure and connectivity at a regional scale holds promise for the control and management of the harmful algal bloom events in the Mediterranean Sea.

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Bloom dynamics and life cycle strategies of two toxic dinoflagellates in a coastal upwelling system (NW Iberian Peninsula)

Cited by 65 publications

References 35 publications

Climatic and Tidal Forcing of Hydrography and Chlorophyll Concentrations in the Columbia River Estuary

Climatic and Tidal Forcing of Hydrography and Chlorophyll Concentrations in the Columbia River Estuary

Life-cycle alternations in Alexandrium minutum natural populations from the NW Mediterranean Sea

Population genetic structure and connectivity of the harmful dinoflagellateAlexandrium minutumin the Mediterranean Sea

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