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1,744 results for “Bacillariophyta”
Figs 1–19 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 1–19. Angusticopula chilensis (Grunow) Houk et al. LM. Campbell Island epitype population, sample BAS286. 1–6, 12–13. Several frustules in girdle view. 5, 12. Internal valves. 7–11, 14–19. Several valves in valve face view clearly showing the marginal rimoportulae. Scale bar = 10 μm.
Phylogenomics reveals an extensive history of genome duplication in diatoms (Bacillariophyta)
<p>Abstract</p> <p>Premise of the Study</p> <p>Diatoms are one of the most species‐rich lineages of microbial eukaryotes. Similarities in clade age, species richness, and primary productivity motivate comparisons to angiosperms, whose genomes have been inordinately shaped by whole‐genome duplication (WGD). WGDs have been linked to speciation, increased rates of lineage diversification, and identified as a principal driver of angiosperm evolution. We synthesized a large but scattered body of evidence that suggests polyploidy may be common in diatoms as well.</p> <p>Methods</p> <p>We used gene counts, gene trees, and distributions of synonymous divergence to carry out a phylogenomic analysis of WGD across a diverse set of 37 diatom species.</p> <p>Key Results</p> <p>Several methods identified WGDs of varying age across diatoms. Determining the occurrence, exact number, and placement of events was greatly impacted by uncertainty in gene trees. WGDs inferred from synonymous divergence of paralogs varied depending on how redundancy in transcriptomes was assessed, gene families were assembled, and synonymous distances (Ks) were calculated. Our results highlighted a need for systematic evaluation of key methodological aspects of Ks‐based approaches to WGD inference. Gene tree reconciliations supported allopolyploidy as the predominant mode of polyploid formation, with strong evidence for ancient allopolyploid events in the thalassiosiroid and pennate diatom clades.</p> <p>Conclusions</p> <p>Our results suggest that WGD has played a major role in the evolution of diatom genomes. We outline challenges in reconstructing paleopolyploid events in diatoms that, together with these results, offer a framework for understanding the impact of genome duplication in a group that likely harbors substantial genomic diversity.</p>
Figs 13–26 in The genus Luticola (Bacillariophyta) on Ile Amsterdam and Ile Saint-Paul (Southern Indian Ocean) with the description of two new species
Figs 13–26. Luticola subcrozetensis Van de Vijver et al. Light (LM) and scanning electron micrographs (SEM) of a population from Ile Saint-Paul. 13–22. LM of valve face views. 23–24. SEM of external view showing composition of striae and typical raphe structure. 25–26. SEM girdle view. Scale bars: 13‒22 = 10 µm; 23‒26 = 5 µm.
Figs 1–12 in The genus Luticola (Bacillariophyta) on Ile Amsterdam and Ile Saint-Paul (Southern Indian Ocean) with the description of two new species
Figs 1–12. Luticola beyensii Van de Vijver et al. Light (LM) and scanning electron micrographs (SEM) of a population from Ile Amsterdam. 1–10. LM of valve face views. 11–12. SEM of external view of entire valve, showing raphe structure, position of the isolated pore and striae structure. Scale bars: 1–10 = 10 µm; 11‒12 = 5 µm.
Figs 44–71 in The genus Luticola (Bacillariophyta) on Ile Amsterdam and Ile Saint-Paul (Southern Indian Ocean) with the description of two new species
Figs 44–71. Luticola vancampiana Chattová & Van de Vijver sp. nov. Light (LM) and scanning electron micrographs (SEM) from the type population from Conserverie on Ile Saint-Paul, B. Van de Vijver sample S029. 44–67. LM showing the variation in size and shape of the valve apices. 68–69. SEM of valve exterior. 70. SEM of valve interior. 71. SEM girdle view. Scale bars: 44–67 10 µm; 68‒71 = 5 µm.
Figs 27–43 in The genus Luticola (Bacillariophyta) on Ile Amsterdam and Ile Saint-Paul (Southern Indian Ocean) with the description of two new species
Figs 27–43. Luticola ivetana Chattová & Van de Vijver sp. nov. Light (LM) and scanning electron micrographs (SEM) from the type population from Entrecasteaux on Ile Amsterdam, B. Van de Vijver sample W030. 27–36. LM of valve face views. 37–38. SEM of valve exterior. 39. SEM girdle view. 40. SEM of valve interior. 41. SEM of external detail of hooked terminal raphe fissures. 42. SEM of external detail view of central area showing the typical deflection of proximal raphe endings. 43. SEM of external detail view of areolae structure. Scale bars: 27‒36 = 10 µm; 37‒38, 40‒43 = 1 µm; 39 = 5 µm.
Fig. 6 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 6: Maxiumum growth rate determination of all temperatures, light intensities and nutrient concentrations.
Fig. 5 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 5: Entomoneis sp biomass (Chl a, µg /L) under different N/P ratios and light intensities (a) representing growth under T1°C (b) T2°C (c) and T3°C.
Fig. 2 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 2: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on chlorophyll a concentration (µg/L) of Entomoneis sp. using an N/P ratio of 11.
Fig. 3 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 3: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on growth rate (day-1) of Entomoneis sp. using an N/P ratio of 4.4.
Fig. 4 in Effect of Nutrient, Light Intensity and Temperature on the Growth Rates and Metabolism of a Stress-Resistant Bacillariophyta Species Entomoneis sp. - in Izmir Bay (Aegean Sea) Abstract
Fig. 4: 3D response surface plot and contour line of Box– Behnken Design showing the mutual effect of temperature and light intensity on growth rate (day-1) of Entomoneis sp. using an N/P ratio of 27.
FIG. 4 in A new Nitzschia Hassall species (Bacillariaceae, Bacillariophyta) from saline ponds in Serbia
FIG. 4. — Nitzschia austriaca Hust. SEM and LM images taken from Bela Bara saline pond. A-C, SEM external valve views of a frustule; C, arrow indicates more widely spaced center fibulae; D-W, LM valve views of a population arranged in decreasing length. Scale bars: A-C, 5 µm; D-W, 10 µm.
FIG. 1 in A new Nitzschia Hassall species (Bacillariaceae, Bacillariophyta) from saline ponds in Serbia
FIG. 1. — Location of the four study saline ponds in the Vojvodina Region, Serbia. A, Bela Bara; B, Čoka Kopovo; C, Velika Rusanda; D, Slatina.
FIG. 3 in A new Nitzschia Hassall species (Bacillariaceae, Bacillariophyta) from saline ponds in Serbia
FIG. 3. — Nitzschia haloserbica Vidaković, Ector, C.E.Wetzel & Krizmanić, sp. nov., SEM images taken from the type material (Bela Bara saline pond): A, C, E, SEM views of a frustule in valve view; B, SEM internal view of two valves from the same frustule; D, SEM internal view of the center of the valve with fibulae regularly distributed; F, SEM internal view of valve apex with helictoglossa and raphe; G, SEM internal detail view of valve apex with helictoglossa. Scale bars: A-C, 5 µm; D, G, 1 µm; E, 3 µm; F, 2 µm.
Figuras 57-93 in DiAtomácEAS (BAcillAriophytA) EpilíticAS DA BAciA HiDrográficA do Rio Itajaí, Santa Catarina, Brasil
Figuras 57-93. Imagens em Microscópio Óptico e em Microscópio Eletrônico de Varredura. Achnanthidium atomus; 57, 58. Vista externa em MEV; 59. Vista valvar em MO; 60-63. A. exiguum; 64-66. A. minutissimum; 64. Vista externa (MEV); 65, 66. MO; 67, 68. A. pyrenaicum; 69, 70. Lemnicola hungarica; 71-74. Planothidium incuriatum; 75-79. P. bagualensis; 80. P. heteromorphum; 81. P. salvadorianum; 82-86. Psammothidium hustedtii; 87-89. Platessa oblongella; 90, 91. Adlafia drouetiana; 92, 93. Capartogramma crucicula. Barras = 10µm
Figuras 28-56 in DiAtomácEAS (BAcillAriophytA) EpilíticAS DA BAciA HiDrográficA do Rio Itajaí, Santa Catarina, Brasil
Figuras 28-56. Imagens em Microscópio Óptico. 28, 30. Gomphonema brasiliensoide; 29, 48. Gomphonema brasiliense ssp. pacificum; 31, 32. Gomphonema sp.1; 33-36. G. gracile; 37, 38. G. lagenula; 39, 40. G. parvulum; 41-43. G. pumilum; 44-46. Gomphonema incognitum; 47. Gomphonema rochense; 49, 50. G. pseudoaugur; 51, 52. G. mexicanum; 53, 55. G. turris var. coarctata; 54. G. salae; 56. Gomphonema sp. 2. Barras = 10µm
Figura 1 in DiAtomácEAS (BAcillAriophytA) EpilíticAS DA BAciA HiDrográficA do Rio Itajaí, Santa Catarina, Brasil
Figura 1. Mapa da localização da bacia hidrográfica do rio Itajaí, Santa Catarina, Brasil e a distribuição dos pontos amostrais nas sub-bacias estudadas.
Figuras 94-129 in DiAtomácEAS (BAcillAriophytA) EpilíticAS DA BAciA HiDrográficA do Rio Itajaí, Santa Catarina, Brasil
Figuras 94-129. Imagens em Microscópio Óptico. 94, 95. Geissleria aikenensis; 96, 97. Placogeia. kriegeri; 98, 99. Navigeia. lateropunctata; 100, 101. Hippodonta hungarica; 102, 103. Navicula leptostriata; 104, 105. N. cryptocephala; 106, 107. N. cryptotenella; 108, 109. N. notha; 110. N. gregaria; 111, 112. N. microdigitoradiata; 113-115. N. salinicola; 116, 117. N. viridula var. germainii; 118, 119. N. rostellata; 120, 121. N. symmetrica; 122, 123. N. eichhorniaephila; 124, 125. N. namibica; 126, 127. N. tripuntata; 128, 129. Nupela pardinhoensis. Barras = 10µm
Phylogenetic analysis reveals that the 'radial centric' diatom Orthoseira Thwaites (Orthoseiraceae, Bacillariophyta) is a member of a 'multipolar' diatom lineage
<p>These .zip files include input and output data for the following analyses that were used to produce this publication: gene sequence alignments (single and concatenated), PartitionFinder2, RAxML, CONSEL.</p>
Figura 1 in Gomphonema Ehrenberg (Bacillariophyta) de córregos prístinos do Cerrado brasileiro
Figura 1. Localização dos pontos amostrais (círculos em preto) e as respectivas unidades de conservação (PNB = Parque Nacional de Brasília; PNCV = Parque Nacional da Chapada dos Veadeiros; PETR = Parque Estadual de Terra Ronca). CB = Córrego Bananal, C1 = Córrego 01, CE = Córrego Estiva, CSD = Córrego São Mateus depois da Caverna, CSA = Córrego São Mateus antes da caverna, CL = Córrego Lapa.
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