Effects of temperature, salinity and composition of the dinoflagellate assemblage on the growth of Gambierdiscus carpenteri isolated from the Great Barrier Reef

Sparrow, Leanne; Momigliano, Paolo; Russ, Garry R.; Heimann, Kirsten

doi:10.1016/j.hal.2017.04.006

Cited by 31 publications

(23 citation statements)

References 60 publications

(107 reference statements)

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“…Public health risks from toxic, coral reef‐associated Gambierdiscus sp . strains are becoming of increasing concern due to climate change and reef disturbance, as heightened macroalgal presence on reefs can act as substrate for epiphytic Gambierdiscus (Sparrow et al ., ) that may produce polyether toxins like ciguatoxin and maitotoxin. These toxins are thought to be synthesized via PKSs in Gambierdiscus (Kohli et al ., ), although the exact mechanisms and precursors are unknown for most species.…”

Section: Discussionmentioning

confidence: 99%

Metabolic relationships of uncultured bacteria associated with the microalgae Gambierdiscus

Rambo

Dombrowski

Constant

et al. 2019

Environmental Microbiology

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Microbial communities inhabit algae cell surfaces and produce a variety of compounds that can impact the fitness of the host. These interactions have been studied via culturing, single-gene diversity and metagenomic read survey methods that are limited by culturing biases and fragmented genetic characterizations. Higher-resolution frameworks are needed to resolve the physiological interactions within these algalbacterial communities. Here, we infer the encoded metabolic capabilities of four uncultured bacterial genomes (reconstructed using metagenomic assembly and binning) associated with the marine dinoflagellates Gambierdiscus carolinianus and G. caribaeus. Phylogenetic analyses revealed that two of the genomes belong to the commonly algae-associated families Rhodobacteraceae and Flavobacteriaceae. The other two genomes belong to the Phycisphaeraceae and include the first algae-associated representative within the uncultured SM1A02 group. Analyses of all four genomes suggest these bacteria are facultative aerobes, with some capable of metabolizing phytoplanktonic organosulfur compounds including dimethylsulfoniopropionate and sulfated polysaccharides. These communities may biosynthesize compounds beneficial to both the algal host and other bacteria, including iron chelators, B vitamins, methionine, lycopene, squalene and polyketides. These findings have implications for marine carbon and nutrient cycling and provide a greater depth of understanding regarding the genetic potential for complex physiological interactions between microalgae and their associated bacteria.

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Section: Discussionmentioning

confidence: 99%

Metabolic relationships of uncultured bacteria associated with the microalgae Gambierdiscus

Rambo

Dombrowski

Constant

et al. 2019

Environmental Microbiology

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“…Phylogenetic analyses of the SSU and LSU of Gambierdiscus have highlighted four clades being present within the genus, with Fukuyoa (previously classified as Gambierdiscus) forming a fifth, separate clade [64]. Discrepancies of clade resolution between the different rDNA gene regions have, however, been observed in Gambierdiscus [43,64].…”

Section: Molecular Methods For Detection and Quantification Of Gambiementioning

confidence: 99%

“…Gambierdiscus is not considered to be an obligate epiphyte and there is evidence to suggest that different macroalgae species may stimulate or inhibit the dinoflagellate's growth, possibly through macroalgal exudates. There is some further evidence for allelopathic interactions between G. carpenteri Kibler, Litaker, M.A.Faust, W.C.Holland, Vandersea, & P.A.Tester and co-occurring epiphytic dinoflagellates impacting on growth and for these interactions to be affected by temperature [43]. In other studies carried out in the Rarotongan lagoons, Cook Islands (approximately 2000 km northwest of the Kermadec Islands), G. honu and G. cheloniae Smith, Rhodes, & Murray [44] were isolated from the phaeophyte Turbinaria J.V.Lamouroux and G. cheloniae was also isolated from the rhodophyte Jania J.V.Lamouroux.…”

Section: Macroalgae Substratesmentioning

confidence: 99%

“…Although G. lapillus, G. lewisii, and G. holmesii all exhibited CTX-and/or MTX-like activities in bioassays, the producer of CTXs, and thus the cause of CFP in Australian waters, is still unknown. From the Cook Islands, isolates of G. cheloniae and G. pacificus were both toxic to mice, despite the presence of only 44-MG, and are being further investigated [38,43].…”

Section: Ciguatera Toxin Risk In New Zealand Watersmentioning

confidence: 99%

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Ciguatera Fish Poisoning: The Risk from an Aotearoa/New Zealand Perspective

Rhodes

Smith

Murray

et al. 2020

Toxins

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Gambierdiscus and Fukuyoa species have been identified in Aotearoa/New Zealand’s coastal waters and G. polynesiensis, a known producer of ciguatoxins, has been isolated from Rangitāhua/Kermadec Islands (a New Zealand territory). The warming of the Tasman Sea and the waters around New Zealand’s northern subtropical coastline heighten the risk of Gambierdiscus proliferating in New Zealand. If this occurs, the risk of ciguatera fish poisoning due to consumption of locally caught fish will increase. Research, including the development and testing of sampling methods, molecular assays, and chemical and toxicity tests, will continue. Reliable monitoring strategies are important to manage and mitigate the risk posed by this emerging threat. The research approaches that have been made, many of which will continue, are summarised in this review.

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“…A high water temperature as observed in Cau Hai lagoon (range from 25-35°C; Appendix S6) might exceed optimal growth conditions for studied dinoflagellate species (generally below 30°C;Warner, Fitt, & Schmidt, 1999;Sparrow, Momigliano, Russ, & Heimann, 2017) and hence result in lower abundances with increasing water temperature. The abundance of dinoflagellates was particularly correlated with temperature (negative correlation;Table 1).…”

mentioning

confidence: 96%

Effects of nutrient supply and nutrient ratio on diversity–productivity relationships of phytoplankton in the Cau Hai lagoon, Vietnam

Hoang

Lieu

et al. 2019

Ecology and Evolution

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Diversity and productivity of primary producers are known to be influenced simultaneously by resource availability and resource ratio, but the relative importance of these two factors differed among studies and so far only entire phytoplankton communities were investigated which might ignore specific nutrient requirements and stoichiometric plasticity of different functional groups. We measured nutrient availability (DIN, total N [TN], total P [TP]), nutrient imbalance (TN:TP, DIN:TP, N:Pseston), species richness, and abundance of the whole phytoplankton community, as well as those specific for cyanobacteria, diatoms, and dinoflagellates in Cau Hai lagoon in Vietnam. We determined the correlation among these variables, using structural equation modeling. The models applied to the whole phytoplankton community indicated that the nutrient availability (particularly TP and DIN) drove variation in phytoplankton abundance and richness, and that abundance also depended on species richness. The models applied to different functional groups differed considerably from the entire community and among each other, and only a part of the models was significant. The relationship between nutrient availability (mainly TP) and abundance was driven by cyanobacteria, and the relationship between nutrient imbalance (only with N:Pseston) and species richness was driven by diatoms. Remarkably, the positive relationship between species richness and abundance, as consistently observed for the whole phytoplankton community, was only observed for one of the three functional groups (diatoms), indicating that resource complementarity occurs particularly among species of different functional groups. Our results emphasized that nutrient availability (TP and to a lesser extent DIN) as well as nutrient imbalance (albeit only with N:Pseston as proxy) were driving factors for the phytoplankton community in the Cau Hai lagoon and hence alterations in both of these factors leading to a shift in phytoplankton species composition and productivity.

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Effects of temperature, salinity and composition of the dinoflagellate assemblage on the growth of Gambierdiscus carpenteri isolated from the Great Barrier Reef

Cited by 31 publications

References 60 publications

Metabolic relationships of uncultured bacteria associated with the microalgae Gambierdiscus

Metabolic relationships of uncultured bacteria associated with the microalgae Gambierdiscus

Ciguatera Fish Poisoning: The Risk from an Aotearoa/New Zealand Perspective

Effects of nutrient supply and nutrient ratio on diversity–productivity relationships of phytoplankton in the Cau Hai lagoon, Vietnam

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