Fine structure, taxonomy and systematics of Reimerothrix (Fragilariaceae: Bacillariophyta), a new genus of synedroid diatoms from Florida Bay, USA

Prasad, A. K. S. K.; Nienow, James A.; Riddle, Kimberly A.

doi:10.2216/i0031-8884-40-1-35.1

Cited by 15 publications

(17 citation statements)

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“…The predominance of marine Mastogloia species at the two marine sites is similar to the characteristics of the Florida Keys back-reef sites analyzed by Montgomery (1978). This spatial distribution of species is also consistent with descriptions of the salinity preferences of these diatoms (Witkowski et al, 2000;Prasad et al, 2001). Differences in diatom species composition were expected at the eastern Florida Bay site 7, which was characterized by elevated seagrass and epiphyte biomass in response to nutrient addition by the resident bird colony (Powell et al, 1991).…”

Section: Discussionsupporting

confidence: 87%

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

et al. 2006

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The spatial and temporal distributions of the epiphytic diatom flora on Thalassia testudinum was described within the Florida Bay estuary and at one Atlantic site east of the Florida Keys over a 1-year period. Species of the genus Mastogloia dominated the epiphytic diatom flora (82 out of 332 total species). Nonmetric Multidimensional Scaling (NMDS) and Analysis of Similarity (ANOSIM) revealed four distinct spatial assemblages and two temporal assemblages. Eastern and western Florida Bay assemblages were identified within the estuary. The eastern diatom assemblage was characterized by high relative abundances of Brachysira aponina and Nitzschia liebetruthii, while the western assemblage was characterized by the abundance of Reimerothrix floridensis, particularly during summer. Two diverse and distinct marine assemblages, one located in the Gulf of Mexico along the western edge of Florida Bay and the other behind the Florida reef tract in the Atlantic Ocean, were also identified. Analysis of the spatial distribution of diatoms and water quality characteristics within Florida Bay suggest that these assemblages may be structured by salinity and nutrient availability, particularly P. The Gulf of Mexico and the western Florida Bay assemblages were associated with higher water column salinities and TP concentrations and lower DIN concentrations and TN:TP ratios relative to the eastern Florida Bay assemblage. The temporal variation in diatom assemblages was associated with water temperature, though temporal indicator species were few relative to the number of spatial indicators.

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Section: Discussionsupporting

confidence: 87%

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

et al. 2006

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“…For example, extreme length occurs in some species of Nitzschia and in Thalassionema, Trichotoxon , Reimerothrix , Thalassiothrix, and Synedra (see Mann 1981, Round et al. 1990, Hasle and Syvertsen 1996, Prasad et al. 2001); as noted previously, it was in Synedra that Toxarium and Ardissonea were classified for many years (Hustedt 1932, Hendey 1964).…”

Section: Discussionmentioning

confidence: 82%

MOLECULAR EVIDENCE CONFIRMS SISTER RELATIONSHIP OF ARDISSONEA, CLIMACOSPHENIA, AND TOXARIUM WITHIN THE BIPOLAR CENTRIC DIATOMS (BACILLARIOPHYTA, MEDIOPHYCEAE), AND CLADISTIC ANALYSES CONFIRM THAT EXTREMELY ELONGATED SHAPE HAS ARISEN TWICE IN THE DIATOMS¹

Medlin

Sato

Mann

et al. 2008

Journal of Phycology

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With the use of a new kit from Qiagen to amplify total genome quantity, DNA was bulked up from two diatoms that are difficult to grow (Ardissonea and Climacosphenia), and the nuclear SSU rRNA gene was successfully amplified. Results of Bayesian analyses showed that these diatoms are sister to Toxarium and belong to the bi- and multipolar centric diatoms. The results indicate that extremely elongate shape has arisen at least twice in diatoms, in the true pennates, and in the bipolar centrics. The two lateral pattern centers of Ardissonea and Climacosphenia likely represent a modified annulus that subtends ribs internally as well as externally. Studies of sexual reproduction are needed to determine whether Ardissonea, Climacosphenia, and Toxarium achieve their elongate shape by similar means to each other and to true pennates, that is, by controlling the expansion of the auxospores by sequential addition of silicified bands (to form a properizonium or perizonium).

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“…Recovery of Toxarium among the multipolar centrics implies that this species has adopted a pennate‐like shape and life style during evolution from a bi‐ or multipolar centric ancestor and that this occurred independently from the similar trend accompanying the evolution of the monophyletic true pennates. The general valve shape of Toxarium resembles that of the unrelated true araphid pennates Synedra montana (see Hustedt 1932, p. 205), Thalassionema bacillare (Heiden in Heiden and Kolbe) Kolbe (Hasle and Syvertsen 1997, p. 258) and Reimerothrix floridensis Prasad (in Prasad et al 2001) and it is therefore a homoplasy. Because all these species are relatively large and occur in bunches attached to various surfaces by mucilage pads, similar environmental constraints may have forced convergence.…”

Section: Discussionmentioning

confidence: 99%

PHYLOGENETIC POSITION OF TOXARIUM, A PENNATE‐LIKE LINEAGE WITHIN CENTRIC DIATOMS (BACILLARIOPHYCEAE)¹

Kooistra

Stefano

Mann

et al. 2003

Journal of Phycology

106

122

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The diatom genus Toxarium Bailey has been treated as a pennate because of its elongate shape and benthic lifestyle (it grows attached to solid substrata in the marine sublittoral). Yet its valve face lacks all structures that would ally it with the pennates, such as apical labiate processes, a midrib (sternum) subtending secondary ribs and rows of pores extending perpendicularly out from the midrib, or a raphe system. Instead, pores are scattered irregularly over the valve face and only form two distinct rows along the perimeter of the valve face. In our nuclear small subunit rDNA phylogenies, Toxarium groups with bi‐ and multipolar centrics, as sister to Lampriscus A. Schmidt. Thus, the genus acquired a pennate‐like shape and lifestyle independently from that of the true pennates. The two species known, T. hennedyanum Grunow and T. undulatum Bailey, differ only in a single feature: the valve perimeter of the former shows only a central expansion, whereas that of the latter possesses in addition a regular undulation. Yet both forms were observed in our monoclonal cultures, indicating that the two taxa represent extremes in a plasticity range. Toxarium resembles another elongate and supposedly araphid diatom, Ardissonea De Notaris, in being motile. Cells can move at speeds of up to 4 μm·s−1 through secretion of mucilage from the cell poles or they remain stationary for longer periods, when they form short polysaccharide stalks. Division during longer periods of quiescence leads to the formation of small colonies of linked or radiating cells.

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Fine structure, taxonomy and systematics of Reimerothrix (Fragilariaceae: Bacillariophyta), a new genus of synedroid diatoms from Florida Bay, USA

Cited by 15 publications

References 0 publications

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

MOLECULAR EVIDENCE CONFIRMS SISTER RELATIONSHIP OF ARDISSONEA, CLIMACOSPHENIA, AND TOXARIUM WITHIN THE BIPOLAR CENTRIC DIATOMS (BACILLARIOPHYTA, MEDIOPHYCEAE), AND CLADISTIC ANALYSES CONFIRM THAT EXTREMELY ELONGATED SHAPE HAS ARISEN TWICE IN THE DIATOMS¹

PHYLOGENETIC POSITION OF TOXARIUM, A PENNATE‐LIKE LINEAGE WITHIN CENTRIC DIATOMS (BACILLARIOPHYCEAE)¹

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Fine structure, taxonomy and systematics of Reimerothrix (Fragilariaceae: Bacillariophyta), a new genus of synedroid diatoms from Florida Bay, USA

Cited by 15 publications

References 0 publications

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

Spatial and temporal distributions of epiphytic diatoms growing on Thalassia testudinum Banks ex König: relationships to water quality

MOLECULAR EVIDENCE CONFIRMS SISTER RELATIONSHIP OF ARDISSONEA, CLIMACOSPHENIA, AND TOXARIUM WITHIN THE BIPOLAR CENTRIC DIATOMS (BACILLARIOPHYTA, MEDIOPHYCEAE), AND CLADISTIC ANALYSES CONFIRM THAT EXTREMELY ELONGATED SHAPE HAS ARISEN TWICE IN THE DIATOMS1

PHYLOGENETIC POSITION OF TOXARIUM, A PENNATE‐LIKE LINEAGE WITHIN CENTRIC DIATOMS (BACILLARIOPHYCEAE)1

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MOLECULAR EVIDENCE CONFIRMS SISTER RELATIONSHIP OF ARDISSONEA, CLIMACOSPHENIA, AND TOXARIUM WITHIN THE BIPOLAR CENTRIC DIATOMS (BACILLARIOPHYTA, MEDIOPHYCEAE), AND CLADISTIC ANALYSES CONFIRM THAT EXTREMELY ELONGATED SHAPE HAS ARISEN TWICE IN THE DIATOMS¹

PHYLOGENETIC POSITION OF TOXARIUM, A PENNATE‐LIKE LINEAGE WITHIN CENTRIC DIATOMS (BACILLARIOPHYCEAE)¹