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45 results for “Thalassiosira”
Growth of Thalassiosira gravida and Thalassiosira rotula across different levels of temperature, photoperiod, and microbiome presence
<p>The provided data represent maximum growth rates of the temperate diatom <em>Thalassiosira</em> <em>rotula</em> obtained from<span> the Harder Lab (University of Bremen; strain <em>T. rotula</em>_S16)</span> and the polar diatom <em>Thalassiosira</em> <em>gravida</em> was obtained <span>from the Norwegian culture collection of algae (NORCCA strain number UIO 478). Data were </span>assessed in a nanocosm (microtiter-plate) 7-day multi-stressor laboratory experiment conducted in November 2022. The experimental design includes different combinations of temperature (4°C; 9°C; 13.5°C), photoperiod (4:20; 16:8; 24:0) and microbiome presence (xenic; axenic) at which growth was assessed to evaluate interactive effects of abiotic factors (temperature & photoperiod) and biotic facors (interactions with microbiome bacteria). Moreover, the code to process the data for statistical analysis is provided.</p>
Figures 98–106. Stricosus and Thalassiosira. Figs 98–103. Stricosus harrisonii. Figs 98, 99. Living cells showing plastids with pyrenoids. Figs 100, 101 in Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist
Figures 98–106. Stricosus and Thalassiosira. Figs 98–103. Stricosus harrisonii. Figs 98, 99. Living cells showing plastids with pyrenoids. Figs 100, 101. Acid cleaned valves in LM and SEM. Fig. 102. External apex showing triangular hyaline area, two spines, rimoportula opening, and ocellulimbus with at least 7 rows of pores (contrast Fig. 62, Hyalosynedra). Fig. 103. Apex internal view showing symmetrical rimoportula (arrow). Figs 104–106. Thalassiosira nanolineata. Fig. 104. Valve in LM at two focal planes. Fig. 105, 106. External and internal aspects in SEM, showing central fultoportulae (F) and rimoportula (R) (arrows). Scale bars: Figs 98, 100, 101 = 20 µm, Fig 104 = 10 µm, Figs 99, 103, 105, 106 = 5 µm, Fig. 102 = 2 µm.
Transcriptome assemblies of Thalassiosira hyalina and Nitzschia frigida
<p>Transcriptome assemblies of Thalassiosira hyalina and Nitzschia frigida originating from a time course experiment, in which these two species were exposed to high light stress and monitored over 120h under low and high pCO2. The corresponding Sequencing data is deposited at the EBI ArrayExpress database under accession number E-MTAB-6999. Contigs were created with Trinity Assembler.</p> <p>The according publication is currently in review (8/6/2019): Higher sensitivity towards light stress and ocean acidification in an Arctic sympagic compared to a pelagic diatom;</p> <p>Author team: Ane C. Kvernvik, Sebastian D. Rokitta, Eva Leu, Lars Harms, Tove M. Gabrielsen, Björn Rost and Clara J. M. Hoppe</p> <p>Do not hesitate to contact the authors if you like more information!</p>
Growth of Thalassiosira gravida and Thalassiosira rotula across different levels of temperature, photoperiod, and microbiome presence
Open the record for dataset details and reuse information.
Diamond-BLASTx of transcriptome contigs of Thalassiosira hyalina and Nitzschia frigida
<p>This is an annotation file, delivering the Diamond-BLASTx results for the contigs of the transcriptome assemblies of Thalassiosira hyalina and Nitzschia frigida. Theswe originate from a time course experiment, in which these two species were exposed to high light stress and monitored over 120h under low and high pCO2. The corresponding Sequencing data is deposited at the EBI ArrayExpress database under accession number E-MTAB-6999. Contigs were created with Trinity Assembler and are available under DOI:10.5281/zenodo.3361258</p> <p>The according publication is currently in review (8/6/2019): Higher sensitivity towards light stress and ocean acidification in an Arctic sympagic compared to a pelagic diatom;</p> <p>Author team: Ane C. Kvernvik, Sebastian D. Rokitta, Eva Leu, Lars Harms, Tove M. Gabrielsen, Björn Rost and Clara J. M. Hoppe</p> <p>Do not hesitate to contact the authors if you like more information!</p>
Chain length, growth rate and clearance rate of Thalassiosira Rotula, Chaetoceros Curvisetus, and Chaetoceros Affinis when exposed to copepodamides.
<p>Colony formation is common feature among non-motile marine phytoplankton. Several theories exist around the potential benefits of larger colonies. Here we test the hypothesis that predation is one of the drivers behind colony formation and chain length plasticity. We exposed cultures of Thalassiosira rotula, Chaetoceros curvisetus and Chaetoceros affinis to copepodamides, a chemical alarm cue released by copepods and perceived as an indicator of predation threat by their prey. This was coupled with a grazing experiment which compared copepod grazing rates on different chain lengths. Our results show that T. rotula and C. curvisetus decreased their chain lengths by 79% and 49%, respectively, in response to copepodamides. Single cells and short chains were grazed at lower rates compared to long chains and the copepodamide driven size shift led to 30% and 12% lower grazing in T. rotula and C. curvisetus respectively. In contrast, C. affinis showed a slight increased chain length in response to copepodamides although non-significant. We found that 2 of 3 studied species reduce their chain length in response to the presence copepod grazers. Altered size structure has implications for the route of carbon in the marine food webs and carbon export to deeper strata.</p>
Differential Gene Expression Dataset of Thalassiosira hyalina and Nitzschia frigida: Response to light stress under contemporary and elevated pCO2
<p>This is a time-course gene expression dataset on the transcriptomic responses of <em>Thalassiosira hyalina</em> and <em>Nitzschia frigida</em> to light stress under contemporary and elevated pCO2. The corresponding Sequencing data is deposited at the EBI ArrayExpress database under accession number E-MTAB-6999. Contigs were created with Trinity Assembler and are available under DOI:10.5281/zenodo.3361258</p> <p>The according publication is currently in review (8/6/2019): Higher sensitivity towards light stress and ocean acidification in an Arctic sympagic compared to a pelagic diatom;</p> <p>Author team: Ane C. Kvernvik, Sebastian D. Rokitta, Eva Leu, Lars Harms, Tove M. Gabrielsen, Björn Rost and Clara J. M. Hoppe</p> <p>Do not hesitate to contact the authors if you like more information!</p>
FIGURES 5–10 in A new species of nanoplanktonic diatom: Thalassiosira catharinensis (Bacillariophyceae) from Southern of Brazil
FIGURES 5–10. Thalassiosira catharinensis. SEM, external views. Rimoportula and fultoportulae are indicated with white arrows. 5. Frustule in external view showing part of the internal view at right hand side. Note the valvocopula with a row of pores at the advalvar edge (*) and areolae with external foramina. The small and shallow internal rimoportula opening is indicated by a black arrow. 6. External view of a frustule showing short external fultoportulae tubes (black arrows). Note the fultoportulae and rimoportula tubes openings in different directions (white arrow). 7. Another valve showing fultoportulae and rimoportula external tubes located next to each other and at the same level. 8. Valve showing fultoportulae and rimoportula tubes openings in distinct directions and a valvocopula with a row of pores at the advalvar edge (*). 9. Valve partially covered by mucilage showing fultoportulae and rimoportula external tubes located next to each other and at the same level. 10. Part of a valve showing fultoportulae and rimoportula tubes openings in different directions. Scale bars: 1 μm.
FIGURES 1–4 in A new species of nanoplanktonic diatom: Thalassiosira catharinensis (Bacillariophyceae) from Southern of Brazil
FIGURES 1–4. Thalassiosira catharinensisin LM images. Figs 1–2. Valves views. Figs 3–4. Group of frustules. Scale bars: 5μm
FIGURES 11–14. Thalassiosira catharinensis. SEM, internal views. Rimoportula indicated with a white arrow. 11. Internal view showing fultoportulae with three satellite pores. 12. Internal general view showing a in A new species of nanoplanktonic diatom: Thalassiosira catharinensis (Bacillariophyceae) from Southern of Brazil
FIGURES 11–14. Thalassiosira catharinensis. SEM, internal views. Rimoportula indicated with a white arrow. 11. Internal view showing fultoportulae with three satellite pores. 12. Internal general view showing a rimoportula located next to a fultoportula with three satellite pores. 13. Detail of the central fultoportula with three satellite pores. 14. Part of a valve showing in detail central and marginal fultoportulae with three satellite pores. A small and shallow rimopotula is located at the same level than the marginal fultoportula. Scale bars: Figs 11–12, 14 = 1 μm, Fig. 13 = 500nm. FIGURE 15. Thalassiosira minima. SEM, internal view showing two central fultopotulae with three satellite pores and marginal fultoportulae with four satellite pores. Note the internal rimportula opening (white arrow) not aligned with the marginal fultoportulae ring. Scale bar: 1 μm
FIGURES 21–26. Figs. 21. Thalassiosira nanolineata, Fig. 21. SEM external valve view. Fig. 21a in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico
FIGURES 21–26. Figs. 21. Thalassiosira nanolineata, Fig. 21. SEM external valve view. Fig. 21a. External opening of two central strutted processes. Fig. 21b. External tube of marginal strutted processes. Figs. 22–25. Psammodiscus nitidus, Fig. 22. SEM internal valve view, note small pore (arrow). Fig. 23. LM external valve view. Fig. 24. SEM external valve view. Fig. 24a. Details of areolae occluded by plated rotae with 2–3 spokes. Fig. 25. LM external valve view. Fig. 26. Thalassiosira eccentrica. Scale bar: figs. 21, 22, 24 = 1 μm, figs. 23, 55, 26 = 10 μm.
FIGURE 8 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 8. SEM Thalassiosira gassaea. Scanning electron micrographs of Thalassiosira gassaea. The exterior of the valve (A) is marked by sparse marginal fultoportulae and a single large rimoportula (arrowed). The interior of the valve exhibits a simple rimoportula with raised lips near the middle of the aperture and reduced near the outside ends of the aperture (D). The fultoportulae are slightly raised with four satellite pores, the areolae are marked with elliptical velum that are slightly depressed into interior valve surface. Internal views of the valve (B & C) show overall valve structure, rimoportula is closely associated with one fultoportula (B & D).
FIGURE 5 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 5. LM Thalassiosira feibelii. Size diminution series of Thalassiosira feibelii Images taken at x1000. Scale bar is 5 μm. B is the holotype.
FIGURE 7 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 7. LM Thalassiosira gassaea. Size diminution series of Thalassiosira gassaea. Images taken at x1000. Scale bar is 2 μm. A is the holotype.
FIGURE 4 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 4. SEM Surirella lorenyangensis. Scanning electron micrographs of Surirella lorenyangensis. A nearly complete frustule (A) with both valves and an attached yet broken girdle band (arrowed). Internal structures are smooth (B) exhibiting hollow fibulae. The internal structure of the fibulae are marked by a lattice structure arrowed in (C). The footpole is rostrate (D), while the headpole is more rounded (E). The ala is downturned towards the girdle at both poles (D & E). The raphe is more towards the exterior sides of the ala in the middle of the valve (C & F) and moves to the top of the ala at the poles (D & E). The raphe is contained within a raised channel along the alar wings (F), ala are supported by the fibulae with unobstructed windows between fibulae (F & G). The exterior valve surface is covered in granules arranged weakly in rows, indicated by arrow in (E), also shown in (A & G).
FIGURE 6 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 6. SEM Thalassiosira feibelii. Scanning electron micrographs of Thalassiosira feibelii. A complete frustule with intact girdle band (A) note the single ring of marginal fultoportulae. The exterior expression of the fultoportulae are marked by granules (B & D). An internal view of T feibelii (E) with exposed areolae in the lower-left portion. Internally, fultoportulae are raised with four satellite pores (F). Internally a simple rimoportula is located in line with the row fultoportulae and is expressed with slightly raised lips and aperture, arrowed in (C). Areolae are loculate, arrowed in (F), velum lies flat with the interior valve wall and foramen is on the exterior wall (G & F).
FIGURE 3 in Three novel species of Bacillariophyta (Diatoms) in the genera Surirella and Thalassiosira from Pleistocene Paleolake Lorenyang (~2 - 1.6 Ma) Turkana Basin, Kenya
FIGURE 3. LM Surirella lorenyangensis. Size diminution series of Surirella lorenyangensis Images taken at x400. Scale bar is 30 μm. C is the holotype.
FIGURES 4–10 in Morphological features and new description of the fossil species Thalassiosira dolmatovae (Bacillariophyceae)
FIGURES 4–10: Thalassiosira dolmatovae, LM (Figs. 4–8), SEM (Figs. 9–10), external views of whole valves. Arrows show central fultoportula. Black line segment is scale bar = 10 µm for Figs. 4–8. a–c—valve in different focus. Fig. 4. Holotype. Fig. 5. Isotype. Figs. 4–6, 9–10, sample #CAS 608382. Fig. 7, #CAS 60269-s. Fig. 8. Paratype, Sample #CAS 608400.
FIGURES 24–29 in Morphological features and new description of the fossil species Thalassiosira dolmatovae (Bacillariophyceae)
FIGURES 24–29: Thalassiosira dolmatovae, SEM. Figs. 24, 25 (enlarged fragment of Fig. 18), 27. Internal views of the valves showing central fultoportula (CF) and marginal strutted processes (MF) surrounded by 4 satellite pores, labiate processes (LP), and copula (C). Fig. 26. Internal view of the valve showing broken labiate processes (LP), central fultoportula (CF), and marginal strutted processes (black arrows). Fig. 28 (enlarged fragment of Fig. 17). External view of the valve with white arrows showing openings of simple occluded processes scattered on the valve face, and black arrow showing rounded opening of marginal strutted process. Fig. 29 (enlarged fragment of Fig. 15). External view of the valve with arrows showing outward extensions of marginal strutted processes with small rounded openings on their tops. Fig. 24, #CAS 60269-s. Figs. 25–26, 28–29, #CAS 608382. Fig. 27, #CAS 608400.
FIGURES 18–23 in Morphological features and new description of the fossil species Thalassiosira dolmatovae (Bacillariophyceae)
FIGURES 18–23: Thalassiosira dolmatovae. SEM Fig. 18. Internal view of the valve with arrow showing occluded (?) areolae (OA). Fig. 20. Internal view of the valve showing labiate process (LP), copula (C), central fultoportula (CF) and marginal strutted processes (short white arrows) surrounded by 4 satellite pores. Fig. 19, 21, 23. External views of valves center showing opening of central strutted process (long arrows) and occluded (?) areolae (short arrows). Fig. 22. Enlarged fragment of Fig. 18 showing central fultoportula (CF), occluded (?) areolae (OA), and marginal strutted processes (short arrows). Figs. 18–22, #CAS 608382. Fig. 23, #CAS 60269.
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