Marine Dinoflagellate Assemblage in the Galápagos Marine Reserve

Carnicer, Olga; Fuente, P. de la; Canepa, Antonio; Keith, Inti; Rebolledo-Monsalve, Eduardo; Diogène, Jorge; Fernández-Tejedor, Margarita

doi:10.3389/fmars.2019.00235

Cited by 7 publications

(9 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ample prey availability (Shang et al ., 2019). Along the coasts of Santa Cruz and other small neighbouring islands in the central region of the GMR, water column surveys of dinoflagellate communities found that 84% of samples contained benthic epiphytic dinoflagellates (Carnicer et al ., 2019), a high percentage given that only ~10% of dinoflagellates associate with a substrate (Hoppenrath et al ., 2014). The suspension of these dinoflagellates in the GMR suggests potential physical mechanisms for benthic resting cyst resuspension.…”

Section: Resultsmentioning

confidence: 99%

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

Neave

Seim

Gifford

et al. 2021

Environmental Microbiology

View full text Add to dashboard Cite

The Gal apagos Archipelago lies within the Eastern Equatorial Pacific Ocean at the convergence of major ocean currents that are subject to changes in circulation. The nutrient-rich Equatorial Undercurrent upwells from the west onto the Gal apagos platform, stimulating primary production, but this source of deep water weakens during El Niño events. Based on measurements from repeat cruises, the 2015/16 El Niño was associated with declines in phytoplankton biomass at most sites throughout the archipelago and reduced utilization of nitrate, particularly in large-sized phytoplankton in the western region. Protistan assemblages were identified by sequencing the V4 region of the 18S rRNA gene. Dinoflagellates, chlorophytes and diatoms dominated most sites. Shifts in dinoflagellate communities were most apparent between the years; parasitic dinoflagellates, Syndiniales, were highly detected during the El Niño (2015) while the dinoflagellate genus, Gyrodinium, increased at many sites during the neutral period (2016). Variations in protistan communities were most strongly correlated with changes in subthermocline water density. These findings indicate that marine protistan communities in this region are regimented by deep water mass sources and thus could be profoundly affected by altered ocean circulation.

show abstract

Section: Resultsmentioning

confidence: 99%

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

Neave

Seim

Gifford

et al. 2021

Environmental Microbiology

View full text Add to dashboard Cite

show abstract

“…Some Gyrodinium species have been found in sediments, and are suspected to form benthic resting cysts which live on internal nutrient reserves for long periods of dormancy until conditions become more favorable for growth (Shang et al, 2019). Along the coasts of Santa Cruz and other small neighboring islands in the central region of the GMR, water column surveys of dinoflagellate communities found that 84% of samples contained benthic epiphytic dinoflagellates (Carnicer et al, 2019), a high percentage given that only ~10% of dinoflagellates associate with a substrate (Hoppenrath et al, no date). The suspension of these epiphytic dinoflagellates in the GMR suggests potential physical mechanisms for benthic resting cyst resuspension.…”

Section: Tablementioning

confidence: 99%

“…Fewer studies have focused on observing in situ environmental conditions and their influence on protistan community compositional changes (McCulloch, 2011;Carnicer et al, 2019). These observations are necessary for understanding the ecological implications of El Niño events in this region.…”

Section: Introductionmentioning

confidence: 99%

“…Sporadic surveys of phytoplankton communities provide a historical record of common diatoms and dinoflagellate species, however they are limited to observations of large, more "charismatic" species easily identified using light microscopy (Torres, 1998;Torres andTapia, 2000, 2002;Tapia and Naranjo, 2012). Some harmful algal species were identified along with spatial variability in dinoflagellate diversity, which was attributed to changes in deep water masses to the west of the Galápagos platform (Carnicer et al, 2019). Accessory phytoplankton pigments have also been used to assess phytoplankton composition in the GMR, such that relative abundances of diatoms and chlorophytes were found to decrease during the 2004/05 El Niño event, while cyanobacteria and haptophyte proportions increased (McCulloch, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

Neave

Seim

Gifford

et al. 2021

Preprint

View full text Add to dashboard Cite

The Galapagos Archipelago lies within the eastern equatorial Pacific Ocean at the convergence of major ocean currents that are subject to changes in circulation. The nutrient-rich Equatorial Undercurrent upwells from the west onto the Galapagos platform, stimulating primary production, but this source of deep water weakens during El Nino events. From measurements collected on repeat cruises, the 2015/16 El Nino was associated with declines in phytoplankton biomass at most sites throughout the archipelago and reduced utilization of nitrate, particularly in large-sized phytoplankton in the western region. Protistan assemblages were identified by sequencing the V4 region of the 18S rRNA gene. Dinoflagellates, chlorophytes, and diatoms dominated most sites. Shifts in dinoflagellate communities were most apparent between the years; parasitic dinoflagellates, Syndiniales, were highly detected during the El Nino (2015) while the dinoflagellate genus, Gyrodinium dominated many sites during the neutral period (2016). Variations in protistan communities were most strongly correlated with changes in subthermocline water density. These findings indicate that marine protistan communities in this region are regimented by deep water mass sources and thus could be profoundly affected by altered ocean circulation.

show abstract

“…There is little information about microalgae diversity in the Archipelago, and the risk of harmful algal blooms (HAB) in the area has not been assessed. A recent study on the southern islands of the GMR reported 18 harmful taxa (Carnicer et al 2019), representing an ecological threat for coastal marine ecosystems and for human health that may result in negative economic and social impacts in the GMR (Kislik et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Ostreopsis cf. ovata and Ostreopsis lenticularis (Dinophyceae: Gonyaulacales) in the Galapagos Marine Reserve

et al. 2020

Self Cite

View full text Add to dashboard Cite

The genus of benthic dinoflagellates Ostreopsis is of particular interest because some species negatively impact human health and coastal marine ecosystems. Ostreopsis populations from a remote area, such as the Galapagos Marine Reserve with its unique biodiversity, can provide significant data. Samples of epibionthic dinoflagellates were collected from two islands (Santa Cruz and Santa Fé) in 2017. Species of the genera Gambierdiscus, Amphidinium, Coolia and Ostreopsis were found. Ostreopsis strains were isolated to characterize their morphology, molecular biology and toxicity. Three different morphotypes of Ostreopsis based on dorsoventral and width diameters (n=369) were distinguished. The small cell morphotype was dominant in ten samples, with abundances of up to 33405 cells g-1 fresh weight of macroalgae. A total of 16 strains were isolated from field samples with subsequent polymerase chain reaction amplifications of rDNA, 5.8S rDNA and internal transcribed space regions; 13 strains (small cell morphotype) clustered in the O. cf. ovata Atlantic/Indian/Pacific clade; and 3 strains (large cell morphotype) clustered in the Ostreopsis lenticularis genotype from the type locality. The strains proved to be non-toxic. The presence of these genera/species represents a potential threat to marine ecosystems, and it is thus important to consider benthic species in the surveillance of harmful algae blooms in the reserve.

show abstract

Marine Dinoflagellate Assemblage in the Galápagos Marine Reserve

Cited by 7 publications

References 63 publications

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

Protistan plankton communities in the Galápagos Archipelago respond to changes in deep water masses resulting from the 2015/16 El Niño

<em>Ostreopsis</em> cf. <em>ovata</em> and <em>Ostreopsis lenticularis</em> (Dinophyceae: Gonyaulacales) in the Galapagos Marine Reserve

Contact Info

Product

Resources

About