Diversity of the diatom genus Pseudo-nitzschia Peragallo in the Quoddy Region of the Bay of Fundy, Canada

Kaczmarska, Irena; LeGresley, Murielle M.; Martin, Jennifer L.; Ehrman, James M.

doi:10.1016/j.hal.2003.07.001

Cited by 82 publications

(79 citation statements)

References 26 publications

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“…It has only been reported infrequently from different locations globally, e.g. the English Channel (Klein et al 2010), Scotland (Bresnan et al 2002;Fehling et al 2006), Bay of Fundy (Kaczmarska et al 2005), from the Japan and Okhotsk Seas (Orlova and Shevchenko 2002) and also from Australian waters (Hallegraeff 1994) and Denmark (Lundholm et al 2010). It is sometimes observed on the setae of Chaetoceros cells (Horner 2002).…”

Section: Discussionmentioning

confidence: 99%

Diversity and seasonality of Pseudo-nitzschia (Peragallo) at two North Sea time-series monitoring sites

et al. 2015

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Species within the diatom genus Pseudo-nitzschia (Peragallo) have been identified as producers of domoic acid, the toxin responsible for amnesic shellfish poisoning. Toxin-and non-toxin-producing species of Pseudo-nitzschia have been reported globally; however, as Pseudo-nitzschia species cannot be routinely identified to species level using light microscopy, cells are rarely recorded to species level during long-term monitoring studies. Here, we report the results of a comparative survey of Pseudo-nitzschia species at two monitoring sites in the North Sea: Stonehaven on the east coast of Scotland and Helgoland Roads in the German Bight. A difference in the seasonality of this genus was observed between the sites with Pseudo-nitzschia cells playing a major role in the spring bloom as well at the summer and autumn diatom community at Stonehaven. In contrast, Pseudo-nitzschia was abundant only during the summer months at Helgoland. Pseudo-nitzschia cells constitute a higher proportion of the diatom community at Stonehaven than at Helgoland, particularly during the late summer, autumn and winter and thus may be considered more 'ecologically important' at this site. A total of eight different species were recorded during this survey with five Pseudo-nitzschia species observed at the Helgoland site: P. pungens, P. fraudulenta, P. americana, P. cf. delicatissima and the potentially toxic species P. multiseries. Six species were also recorded at Stonehaven; P. australis, P cf. delicatissima, P. pungens, P. cf. pseudodelicatissima, P. subpacifica and P. seriata. This study represents the first examination of the seasonality of Pseudo-nitzschia species around Helgoland and the first comparison between two long-term monitoring sites in the North Sea. P. americana and P. multiseries are also recorded at the Helgoland Roads time-series site for the first time.

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Section: Discussionmentioning

confidence: 99%

Diversity and seasonality of Pseudo-nitzschia (Peragallo) at two North Sea time-series monitoring sites

et al. 2015

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“…P. americana had previously been observed only as epiphytic single cells, in contrast to other Pseudo-nitzschia species, but has now also been found forming the chains typical of Pseudo-nitzschia (Kaczmarska et al, 2005). Another unusual Pseudo-nitzschia species is P. galaxiae, which has a completely different stria structure than the other species.…”

Section: Phylogenymentioning

confidence: 96%

“…Lundholm et al, 2003;Kaczmarska et al, 2005;Sahraoui et al, 2009;Lundholm et al, in press). Similarly, the intrageneric and intraspecific diversity has been found to be greater than presently recorded (Stehr et al, 2002;McDonald et al, 2007); sequencing of LSU rDNA of strains from coastal waters of Washington State showed the presence of new ribotypes in the P. pseudodelicatissima group (Stehr et al, 2002).…”

Section: Phylogenymentioning

confidence: 99%

“…Uncertainties remain regarding DA production, storage and release, but this opens new options for studying its potential role as a cell ''communication'' molecule that could help to explain the ecological success of toxigenic Pseudo-nitzschia species. Interactions between bacteria (epibiotic and extracellular) and Pseudo-nitzschia, in relation to DA production (reviewed by Bates, 1998;Kaczmarska et al, 2005;Guannel et al, 2011) may also provide an advantage to this diatom. In contrast to the success of DA-producing species, one must also ask what comparable strategies may be used by those Pseudonitzschia species that do not produce this toxin, yet are still successful.…”

Section: Future Needsmentioning

confidence: 99%

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Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

et al. 2012

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“…Samples were cleaned and prepared for SEM as described in Kaczmarska et al (2005) and observed using a JEOL JSM-5600 SEM (JEOL USA, Peabody, MA, USA) at the Digital Microscopy Facility, Mount Allison University, operating at 10 kV and 8 mm working distance. Valve diameter, number of areolae, pores on the valve face and the valvocopulae, and the number of fultoportulae and rimoportulae per valve were determined for at least 30 valves using SEM images from each of four cultured isolates; CCMP 495 (prior to sorting sub-clones), CCMP 496, and two newly established cultures in our laboratory referred to hereafter as M. trioculatus var.…”

Section: Acquisition Of Morphometric Datamentioning

confidence: 99%

Morphological and molecular characteristics of selected species ofMinidiscus(Bacillariophyta, Thalassiosiraceae)

Kaczmarska

Lovejoy

Potvin

et al. 2009

European Journal of Phycology

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We report on taxonomically distinguishing morphological features of six diatom taxa from the marine, nanoplanktonic genus, Minidiscus, found in Eastern Canada and neighbouring waters. Four of the six were also investigated using genetic approaches. We found that the culture deposited in the Provasoli-Guillard National Center for Culture of Marine Phytoplankton (CCMP) as CCMP 496 was morphologically closest to the published type image of M. trioculatus, whereas other isolates were morphologically and/or genetically divergent. Consequently, we propose three new taxa. One monoclonal line isolated from the Bay of Fundy is proposed as a new variety, M. trioculatus var. monoculatus. The well-studied nanoplanktonic diatom strain, CCMP 495, currently considered to be 'M. trioculatus' was morphologically and genetically divergent from CCMP 496 and we propose specific status for it, M. variabilis. We isolated a new strain from the Gulf of St Lawrence that was nearly genetically identical in 18S and ITS regions to CCMP 495, but showed distinct morphological differences and we propose a new form for this strain. Culture-based data were supplemented by those from natural seawater whenever possible. Two species (M. comicus, M. chilensis) known from our region, but unavailable in culture, are presented for comparison.

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Diversity of the diatom genus Pseudo-nitzschia Peragallo in the Quoddy Region of the Bay of Fundy, Canada

Cited by 82 publications

References 26 publications

Diversity and seasonality of Pseudo-nitzschia (Peragallo) at two North Sea time-series monitoring sites

Diversity and seasonality of Pseudo-nitzschia (Peragallo) at two North Sea time-series monitoring sites

Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

Morphological and molecular characteristics of selected species ofMinidiscus(Bacillariophyta, Thalassiosiraceae)

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