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  • 1
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    Temporal and spatial variability of the potentially toxic Pseudo-nitzschia spp. in a eutrophic estuary (Sea of Marmara)
    Cambridge University Press (CUP) ; 2017
    In:  Journal of the Marine Biological Association of the United Kingdom Vol. 97, No. 7 ( 2017-11), p. 1483-1494
    Details
    In: Journal of the Marine Biological Association of the United Kingdom, Cambridge University Press (CUP), Vol. 97, No. 7 ( 2017-11), p. 1483-1494
    Abstract: Spatial and temporal variability and bloom formation of the potentially toxic diatom Pseudo-nitzschia spp. was investigated weekly to monthly from October 2009 to October 2010 in a eutrophic estuary, the Golden Horn. Pseudo-nitzschia spp. were detected in 195 of 512 samples (38%) collected throughout the year. Two species, P. calliantha and P. pungens , were identified based on the SEM examination. Blooms of Pseudo-nitzschia occurred in the lower and middle estuary in January and May. The bloom in January mainly comprised P. calliantha . In the bloom in early May, P. calliantha made up 72% of the Pseudo-nitzschia cells and P. pungens 28%. However, the contribution of P. pungens increased to 83% in late May. The Pseudo-nitzschia blooms occurred at low temperature (9–15°C) and moderate salinity (17–18), and for P. calliantha a significant negative correlation was found with temperature and a significant positive correlation with salinity. The percentage of Pseudo-nitzschia cells decreased gradually from lower to upper estuary (59–14%), correlating with a decrease in Secchi depth (5.5–0.5 m). Principal components analyses (PCA) were used to explore the spatial and temporal variability of environmental factors in relation to Pseudo-nitzschia abundances, and showed that NH 4 , pH, Secchi depth and DO values were the most important factors reflecting spatial differences, while temperature, salinity, Chl- a and Si:N were more important factors showing temporal differences. High abundances of P. pungens correlated mainly with pH, Secchi depth and DO values, whereas P. calliantha also correlated with NO 3 + NO 2 . Low light availability due to high concentrations of suspended material and very variable environmental conditions (e.g. pH, DO and NH 4 ) may have limited growth of Pseudo-nitzschia in the upper estuary. Regular monitoring of Pseudo-nitzschia is important for improving the understanding of the influence of environmental parameters on bloom dynamics in the study area.
    Type of Medium: Online Resource
    ISSN: 0025-3154 , 1469-7769
    URL: Article
    DOI: 10.1017/S0025315416000837
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2017
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  • 2
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    MORPHOLOGY OF THE MARINE DIATOM NITZSCHIA NAVIS‐VARINGICA , SP. NOV. (BACILLARIOPHYCEAE), ANOTHER PRODUCER OF THE NEUROTOXIN DOMOIC ACID
    Wiley ; 2000
    In:  Journal of Phycology Vol. 36, No. 6 ( 2000-12-14), p. 1162-1174
    Details
    In: Journal of Phycology, Wiley, Vol. 36, No. 6 ( 2000-12-14), p. 1162-1174
    Abstract: A new marine diatom, Nitzschia navis‐varingica , sp. nov., isolated from Vietnamese waters, is described by light, transmission, and scanning electron microscopy, including thin sectioning. The new species has been found to produce the neurotoxin domoic acid (DA), better known from several species of Pseudo‐nitzschia Peragallo and one species of Amphora Ehrenberg. Production of DA is therefore more widespread among diatoms than previously thought. Taxonomically, the genus Nitzschia Hassall is exceptionally difficult, with about 900 described taxa. Grunow (in Cleve and Grunow 1880 divided the genus into 24 sections, and this system is still used with modifications. Nitzschia navis‐varingica , sp. nov. fits best into a group of sections that includes Dubiae, Bilobatae , most of the Lanceolatae , and Lineares , all sensu Grunow, as the cell is slightly indented in the middle in girdle view and has a moderately eccentric raphe and a weak longitudinal fold on the valve. Many species within these sections have features similar to N. navis‐varingica , but no species seems to be identical. Because both Pseudo‐nitzschia and Nitzschia belong to the family Bacillariaceae, it seems reasonable to look for further producers of DA in this family, including freshwater species, which mainly comprise species within the sections Dubiae, Bilobatae, Lanceolatae , and Lineares.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Article
    DOI: 10.1046/j.1529-8817.2000.99210.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2000
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    detail.hit.zdb_id: 1478748-9
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  • 3
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    MORPHOLOGY AND MOLECULAR CHARACTERIZATION OF PSEUDO‐NITZSCHIA (BACILLARIOPHYCEAE) FROM MALAYSIAN BORNEO, INCLUDING THE NEW SPECIES PSEUDO‐NITZSCHIA CIRCUMPORA SP. NOV
    Wiley ; 2012
    In:  Journal of Phycology Vol. 48, No. 5 ( 2012-10), p. 1232-1247
    Details
    In: Journal of Phycology, Wiley, Vol. 48, No. 5 ( 2012-10), p. 1232-1247
    Abstract: Field sampling was undertaken to investigate the occurrence of P seudo‐nitzschia P eragallo species in eight locations along the coast of M alaysian B orneo. A total of 108 strains of P seudo‐nitzschia species were isolated, and their morphology examined with SEM and TEM . Additionally, molecular data from nuclear‐encoded partial LSU r DNA , and ITS regions, were characterized. A total of five species were confidently identified based on a combination of distinct morphological characteristics and supporting molecular evidence: P . brasiliana L undholm, H asle & F ryxell, P . cuspidata ( H asle) H asle, P . dolorosa L undholm & M oestrup, P . micropora P riisholm, M oestrup & L undholm, and P . pungens ( G runow) H asle var. pungens . However, one morphotype from S arawak, while somewhat similar to P . caciantha , showed significant morphological distinction from this and any other of the currently described species. Most notably this morphotype possessed a characteristic pore arrangement in the poroids, with the fine pores in each perforation sector arranged in circles. Pair‐wise sequence comparison of the LSU r DNA between this unidentified morphotype and P . caciantha L undholm, M oestrup & H asle, revealed 2.7% genetic divergence. Phylogenetic analyses strongly supported the monophyly of the morphotype. Based upon these supporting data it is here described as a new species, P seudo‐nitzschia circumpora sp. nov. A key to the six species of P seudo‐nitzschia from M alaysian B orneo is presented. Molecular signatures for all species were established based on structural comparisons of ITS 2 r RNA transcripts.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2012.48.issue-5
    DOI: 10.1111/j.1529-8817.2012.01213.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2012
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  • 4
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    Pseudo‐nitzschia arctica sp. nov., a new cold‐water cryptic Pseudo‐nitzschia species within the P. pseudodelicatissima complex
    Wiley ; 2016
    In:  Journal of Phycology Vol. 52, No. 2 ( 2016-04), p. 184-199
    Details
    In: Journal of Phycology, Wiley, Vol. 52, No. 2 ( 2016-04), p. 184-199
    Abstract: A new nontoxic Pseudo‐nitzschia species belonging to the P. pseudodelicatissima complex, P. arctica , was isolated from different areas of the Arctic. The erection of P. arctica is mainly supported by molecular data, since the species shares identical ultrastructure with another species in the complex, P. fryxelliana , and represents a new case of crypticity within the genus. Despite their morphological similarity, the two species are not closely related in phylogenies based on LSU , ITS and rbc L. Interestingly, P. arctica is phylogenetically most closely related to P. granii and P. subcurvata , from which the species is, however, morphologically different. P. granii and P. subcurvata lack the central larger interspace which is one of the defining features of the P. pseudodelicatissima complex. The close genetic relationship between P. arctica and the two species P. granii and P. subcurvata is demonstrated by analysis of the secondary structure of ITS 2 which revealed no compensatory base changes, two hemi‐compensatory base changes, and two deletions in P. arctica with respect to the other two species. These findings emphasize that rates of morphological differentiation, molecular evolution and speciation are often incongruent for Pseudo‐nitzschia species, resulting in a restricted phylogenetic value for taxonomic characters used to discriminate species. The description of a new cryptic species, widely distributed in the Arctic and potentially representing an endemic component of the Arctic diatom flora, reinforces the idea of the existence of noncosmopolitan Pseudo‐nitzschia species and highlights the need for combined morphological and molecular analyses to assess the distributional patterns of phytoplankton species.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2016.52.issue-2
    DOI: 10.1111/jpy.12395
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2016
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    detail.hit.zdb_id: 1478748-9
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  • 5
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    Molecular Phylogeny and Taxonomy of the Genus Minidiscus (Bacillariophyceae), with Description of Mediolabrus gen. nov
    Wiley ; 2020
    In:  Journal of Phycology Vol. 56, No. 6 ( 2020-12), p. 1443-1456
    Details
    In: Journal of Phycology, Wiley, Vol. 56, No. 6 ( 2020-12), p. 1443-1456
    Abstract: The genus Minidiscus comprises a group of ecologically‐important and globally‐distributed planktonic diatoms that are characterized by their small cell size, high mantle and processes more or less concentrated in the valve center. Monoclonal strains were established from collections along the Chinese coast. In the phylogenetic analyses inferred from a LSU and SSU dataset, six Minidiscus species clustered into two well‐supported clades. The first clade was located within a larger clade formed mainly by Thalassiosira taxa, and the second clade appeared as sister to a clade comprising the genus Skeletonema . Hence, presently known Minidiscus do not form a monophyletic clade, but rather make up a phenotypic grouping. Based on the morphology of the type species, M. trioculatus , as well as morphological characters of all taxa in the clade with M. trioculatus , Minidiscus is characterized by having fultoportula(e) in the valve center or sub‐centered close to a single rimoportula, and the cells are usually cylindrical. Mediolabrus gen. nov. is proposed to accommodate species in the second clade. The main difference between Minidiscus and Mediolabrus is the type of process found in the valve (sub‐)center, with fultoportula(e) close to a rimoportula in the former, and only a single rimoportula in the latter. According to the above criteria, previously described Minidiscus taxa were re‐examined, and either retained in Minidiscus or transferred to Mediolabrus .
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.v56.6
    DOI: 10.1111/jpy.13038
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
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  • 6
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    IDENTIFICATION AND ASSESSMENT OF DOMOIC ACID PRODUCTION IN OCEANIC PSEUDO-NITZSCHIA (BACILLARIOPHYCEAE) FROM IRON-LIMITED WATERS IN THE NORTHEAST SUBARCTIC PACIFIC
    Wiley ; 2008
    In:  Journal of Phycology Vol. 44, No. 3 ( 2008-06), p. 650-661
    Details
    In: Journal of Phycology, Wiley, Vol. 44, No. 3 ( 2008-06), p. 650-661
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2008.44.issue-3
    DOI: 10.1111/j.1529-8817.2008.00526.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2008
    detail.hit.zdb_id: 281226-5
    detail.hit.zdb_id: 1478748-9
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  • 7
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    Morphology and molecular phylogeny of Chaetoceros dayaensis sp. nov. (Bacillariophyceae), characterized by two 90° rotations of the resting spore during maturation
    Wiley ; 2015
    In:  Journal of Phycology Vol. 51, No. 3 ( 2015-06), p. 469-479
    Details
    In: Journal of Phycology, Wiley, Vol. 51, No. 3 ( 2015-06), p. 469-479
    Abstract: Recent studies suggest that a high species diversity of Chaetoceros exists in tropical waters. Based on plankton samples from Chinese tropical waters, Daya Bay of the South China Sea, a new species, Chaetoceros dayaensis sp. nov., is described. Vegetative cells and resting spores were examined by light microscopy as well as transmission and scanning electron microscopy. The nuclear rDNA molecular markers SSU , ITS and D1–D3 of LSU , and the chloroplast rbcL gene were sequenced for information on phylogenetic relationships. The species is characterized by the presence of two 90° rotations of the resting spore during maturation. First a rotation in the apical plane of the mother cell resulting in the valvar plane of the resting spore turning from parallel to perpendicular to that of the mother cell, and a second 90° rotation in the valvar plane of the mother cell resulting in the valve faces of the resting spore turning from facing narrow girdle view to broad girdle view of the mother cell. It is the first report of two 90° rotations of resting spores during maturation in Chaetoceros . Based on this, the maturation rotation of the resting spore of C. rotosporus was reevaluated. C. dayaensis belongs to the subgenus Hyalochaete Gran and we suggest placing it in the section Laciniosa , although a new subdivision of Chaetoceros is needed. The description of C. dayaensis was based on analyses of the phylogenetic relationships combined with morphological comparisons with other similar species.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2015.51.issue-3
    DOI: 10.1111/jpy.12290
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2015
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    detail.hit.zdb_id: 1478748-9
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  • 8
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    Global diversity of two widespread, colony‐forming diatoms of the marine plankton, C haetoceros socialis (syn. C . radians ) and C haetoceros gelidus sp. nov.
    Wiley ; 2013
    In:  Journal of Phycology Vol. 49, No. 6 ( 2013-12), p. 1128-1141
    Details
    In: Journal of Phycology, Wiley, Vol. 49, No. 6 ( 2013-12), p. 1128-1141
    Abstract: Marine phytoplankton samples containing diatoms of the C haetoceros socialis group were collected from T hailand, C hina, D enmark, and G reenland, and cells were isolated into culture for light and electron microscopy and DNA sequencing of D1–D3 of the LSU rDNA . Species of this lineage are characterized by three short and one long setae extending from each cell, the long setae from several cells joining into a common center to form large colonies, which are sometimes visible with the naked eye. Phylogenetic analyses including sequences from other parts of the world revealed segregation into three groups. Most sequences fell into two large clades, one comprising material from cold waters, whereas the other contained material from warmer waters. Strain CCMP 172 from the S trait of G eorgia, Washington State, USA , formed a separate group. The warm‐water species included C hinese and T hai material and therefore probably also material from the type locality of C . socialis , H ong K ong. It is characterized by all setae being covered by spines and the setae extending from the valve at some distance from the margin. In the resting spores, both valves are ornamented with spines. The cold‐water material is characterized by three spiny and one mostly smooth long setae, and the setae extend from the valve near the margin. Both valves of the resting spore are smooth. This material is described as C . gelidus sp. nov. C . radians , described from the B altic in 1894, is considered a synonym of C . socialis . CCMP 172 is in many ways intermediate and probably constitutes a separate species. The published evidence on this globally distributed and sometimes bloom‐forming group of species indicates higher species diversity than presently thought.
    Type of Medium: Online Resource
    ISSN: 0022-3646 , 1529-8817
    URL: Issue
    URL: Article
    DOI: 10.1111/jpy.2013.49.issue-6
    DOI: 10.1111/jpy.12121
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2013
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    detail.hit.zdb_id: 1478748-9
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  • 9
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    Inorganic carbon acquisition in potentially toxic and non‐toxic diatoms: the effect of pH‐induced changes in seawater carbonate chemistry
    Wiley ; 2008
    In:  Physiologia Plantarum Vol. 133, No. 1 ( 2008-05), p. 92-105
    Details
    In: Physiologia Plantarum, Wiley, Vol. 133, No. 1 ( 2008-05), p. 92-105
    Abstract: The effects of pH‐induced changes in seawater carbonate chemistry on inorganic carbon (C i ) acquisition and domoic acid (DA) production were studied in two potentially toxic diatom species, Pseudo‐nitzschia multiseries and Nitzschia navis‐varingica , and the non‐toxic Stellarima stellaris . In vivo activities of carbonic anhydrase (CA), photosynthetic O 2 evolution and CO 2 and HCO 3 − uptake rates were measured by membrane inlet MS in cells acclimated to low (7.9) and high pH (8.4 or 8.9). Species‐specific differences in the mode of carbon acquisition were found. While extracellular carbonic anhydrase (eCA) activities increased with pH in P. multiseries and S. stellaris , N. navis‐varingica exhibited low eCA activities independent of pH. Half‐saturation concentrations (K 1/2 ) for photosynthetic O 2 evolution, which were highest in S. stellaris and lowest in P. multiseries , generally decreased with increasing pH. In terms of carbon source, all species took up both CO 2 and HCO 3 − . K 1/2 values for inorganic carbon uptake decreased with increasing pH in two species, while in N. navis‐varingica apparent affinities did not change. While the contribution of HCO 3 − to net fixation was more than 85% in S. stellaris , it was about 55% in P. multiseries and only approximately 30% in N. navis‐varingica . The intracellular content of DA increased in P. multiseries and N. navis‐varingica with increasing pH. Based on our data, we propose a novel role for eCA acting as C i ‐recycling mechanism. With regard to pH‐dependence of growth, the ‘HCO 3 − user’ S. stellaris was as sensitive as the ‘CO 2 user’ N. navis‐varingica . The suggested relationship between DA and carbon acquisition/C i limitation could not be confirmed.
    Type of Medium: Online Resource
    ISSN: 0031-9317 , 1399-3054
    URL: Issue
    URL: Article
    DOI: 10.1111/ppl.2008.133.issue-1
    DOI: 10.1111/j.1399-3054.2007.01038.x
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2008
    detail.hit.zdb_id: 208872-1
    detail.hit.zdb_id: 2020837-6
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  • 10
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    Mesodinium rubrum : The symbiosis that wasn’t
    Proceedings of the National Academy of Sciences ; 2017
    In:  Proceedings of the National Academy of Sciences Vol. 114, No. 7 ( 2017-02-14)
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 114, No. 7 ( 2017-02-14)
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.1619247114
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2017
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
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