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39 results for “vegetation history”
Figures 125-130 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 125-130 Hannaea inaequidentata, pre-normal vegetative valves, internal view, SEM125 twisted and rounded valve 126 arcuate valve with swollen middle part 127 valve with sternum and swollen middle part 128 valve with bi-constricted middle part and sternum 129 slightly arcuate valve with parallel middle part and sternum 130 nearly normal valve. Scale bars: 20 μm (125–130).
Figures 29-34 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 29-34 Hannaea cf. baicalensis, SEM. 29–32, 34 details of cingulum 33 central area of valve, internal view, note buttressed central area. Scale bar: 2 μm (29–34).
Figures 119-124 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 119-124 Hannaea inaequidentata, apex details of pre-normal cells, external view, SEM119 apex detail of Fig. 107 showing deflexed sternum (arrow) 120 apex detail of Fig. 108 showing irregular striae and small ocellulimbus (arrow) 121 Apex detail of Fig. 109 showing twisted valve 122 apex detail of Fig. 110 showing almost normal sternum and striae (two arrows) 123 apex detail of Fig. 111 showing twisted valve and not well-developed spines 124 apex detail of Fig. 112 showing well-developed spines and almost normal ocellulimbus. Scale bars: 2 μm (119–124).
Figures 10-17 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 10-17 Hannaea cf. arcus, SEM10–13 external view of valve, note linking spines and central area 14–17 internal view of valve, note central area lacking buttressing (15). Scale bars: 10 μm (10, 14), 2 μm (11–13, 15–17).
Figures 113-118 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 113-118 Hannaea inaequidentata, middle details of pre-normal cells, external view, SEM113 middle part of Fig. 107 showing deflexed sternum (two arrows) and central area 114 detail of middle illustrated in Fig. 108 showing sternum (two arrows) and central area 115 detail of middle illustrated in Fig. 109 showing sternum (two arrows) and central area 116 detail of middle part illustrated in Fig. 110 showing developed virgae and vimines 117 detail of middle part illustrated in Fig. 111 showing developed spines 118 detail of middle part illustrated in Fig. 112 showing well-developed virgae, vimines and spines. Scale bars: 5 μm (113–118).
Figures 97-102 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 97-102 Hannaea inaequidentata, dividing half mother frustule, external view, SEM97 slightly displaced half mother frustule, note its rounded outline 98 middle detail of Fig. 97 showing broken longitudinal perizonium 99, 100 details of Fig. 98 (two asterisks) showing broken longitudinal perizonium (arrows) and distinctive plaques (arrowheads) 101 apex detail of Fig. 97 showing irregular ocellulimbus and 4:2 configuration of girdle bands 102 another apex detail of Fig. 97 showing 4:2 configuration of girdle bands and a new-born hypovalve with regular sternum (two arrows). Scale bars: 10 μm (97, 98), 2 μm (99–102).
Figures 107-112 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 107-112 Hannaea inaequidentata, pre-normal frustules, external view, SEM107 frustule with arcuate outline and swollen middle 108 frustule with developed sternum 109 frustule with bi-constricted middle and developed sternum 110 frustule with globular middle and developed sternum 111 twisted frustule with developed sternum 112 frustule with distinct virgae and developed sternum. Scale bars: 20 μm (107–112).
Figures 103-106 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 103-106 Hannaea inaequidentata, half mother frustule, external view, SEM103 half mother frustule, note its rounded outline 104 middle detail of Fig. 103 showing longitudinal perizonium (arrows) and plaques (arrowheads) 105 apex detail of Fig. 103106 apex detail of Fig. 103 showing four girdle bands and hypovalve with spines (arrows). Scale bars: 10 μm (103), 2 μm (104–106).
Figures 91-96 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 91-96 Hannaea inaequidentata, an initial frustule, external view, SEM91 complete initial frustule, note its rounded outline 92 detail of Fig. 90, showing longitudinal perizonium wholly covering valve surface, no transverse perizonium bands (arrows) 93 detail of Fig. 90 showing longitudinal perizonium (arrows) 94 detail of Fig. 91 showing longitudinal perizonium on two valves and one girdle band (arrows) 95, 96 two apex details of Fig. 91 showing longitudinal perizonium (arrows), irregular ocellulimbus, and two rimoportulae per valve (curved arrows). Scale bars: 20 μm (91), 1 μm (92–96).
Figures 85-90 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 85-90 Hannaea inaequidentata, an initial frustule, external view, SEM85 complete initial frustule, note its rounded, cylinder-like, twisted outline 86 middle detail of Fig. 85, showing central area, sternum not developed (two arrows), longitudinal perizonium wholly covering valve surface, no transverse perizonium bands 87 detail of Fig. 85 showing longitudinal perizonium (arrows), plaques (arrowheads), and two girdle bands 88 detail of Fig. 86 showing longitudinal perizonium (arrows) 89 apex detail of Fig. 85 showing longitudinal perizonium (arrow) and irregular ocellulimbus located in valve margin (curved arrow) 90 another apex of Fig. 85, note depressed pole (arrow). Scale bars: 20 μm (85), 10 μm (52), 1 μm (86–90).
Figures 60-65 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 60-65 Hannaea inaequidentata, normal vegetative valves, external view, SEM60 displaced frustule 61 detail of Fig. 60, showing well-developed virgae and vimines (arrows), spines mostly located between two adjacent virgae, sometimes situated on virgae (arrowheads) 62, 63 apex details of Fig. 62 showing rimoportula configuration in two valves forming a cell: each cell with two rimoportulae, located diagonally at both apices of each cell (two arrows, respectively) 64, 65 another two apices showing a regular ocellulimbus and areolae occluded internally by hymens. Scale bars: 10 μm (60), 2 μm (61–63), 1 μm (64, 65).
Figures 66-69 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 66-69 Hannaea inaequidentata, normal vegetative valve, internal view, SEM66 complete valve 67 detail of Fig. 66 showing unilateral swollen middle 68, 69 details of Fig. 66 showing regular sternum and radiating striae near each apex. Scale bars: 10 μm (66), 2 μm (67–69).
Figures 79-84 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 79-84 Hannaea inaequidentata, an initial frustule, external view, SEM79 complete initial frustule, note its rounded, cylinder-like, twisted outline 80 middle detail of Fig. 79, showing central area, sternum not developed (i.e. striae continue across valve surface, also see 81, 83, arrow), longitudinal perizonium wholly covering valve surface, no transverse perizonium bands (also see Figs 85–106) 81 detail of Fig. 79 showing sternum not developed (arrow) 82 apex detail of Fig. 79 showing two girdle bands for this initial frustule, sternum not developed. 83, 84 details of Fig. 79 showing two disc-shaped incunabular scales with cerebral-cortex-like surfaces (83 curved arrow; 84 arrow). Scale bars: 10 μm (79), 2 μm (80–84).
Figures 70-78 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 70-78 Hannaea inaequidentata, initial frustules and pre-normal vegetative valves, LM70, 71 two initial frustules, note nonexistent (undeveloped) sternum and irregular valve face 72–78 seven pre-normal vegetative valves showing seven irregular valve shapes: almost straight with undulate valve margins (72), sigmoid with constricted two middle margins (73), double S-shaped with one middle margin constricted (74), parallel middle margins with one half of valve straight and the other deflexed (75), swollen middle part with almost straight valve (76), arcuate with globular middle part (77), and nearly normal but distinctly arcuate (78).
Figures 1-9 from: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136
Figures 1-9 Hannaea cf. arcus and Hannaea cf. baicalensis, LM1–7 seven valves showing valve size diminution series for Hannaea cf. arcus8, 9 two valves of Hannaea cf. baicalensis. Scale bar: 10 μm (1, 8).
History of research sites including earlier vegetation types at the Kellogg Biological Station, Hickory Corners, MI
Dataset Abstract Information about earlier vegetation, farming, etc. original data source http://lter.kbs.msu.edu/datasets/141
ABoVE: Vegetation Composition across Fire History Gradients on the Y-K Delta, Alaska
This dataset provides ecological field data that were collected during July 2017 and July 2018 from 43 plots spanning gradients of fire history in the upland tundra of the Yukon-Kuskokwim (Y-K) Delta, Alaska. Plot-level data include vegetation species composition and structure, leaf area index (LAI), topography, thaw-depth, and soil characteristics collected at plots burned in 1971-1972, 1985, 2006-2007, 2015, or unburned controls. Vegetation species were sampled along transects using the vegetation point-intercept (VPI) sampling approach and summarized by three metrics of vegetation cover: (1) top-hit cover, (2) any-hit cover, and (3) multi-hit cover. Each metric is the total number of hits for a species divided by the total number of sample points. The VPI any-hit cover metric data were combined with Landsat imagery to develop fractional maps of any-hit cover for four aggregated plant functional types (PFTs); bryophytes, herbs, lichen, and shrubs for the upland tundra area. Photographs of vegetation transects and soil pits are included as companion files.
Field Data on Soils, Vegetation, and Fire History for Alaska Tundra Sites, 1972-2020
This dataset, titled the Synthesized Alaskan Tundra Field Database (SATFiD), provides a comprehensive collection of in-situ field data compiled from 37 existing datasets resulting from field surveys conducted at Alaska tundra sites between 1972 to 2020. The data were harmonized prior to being included in this dataset. The variables include active layer thickness, vegetation cover (by plant functional types), soil moisture and temperatures, as well as the wildfire history. SATFiD provides a unique lens into various long-term ecological processes within the tundra (such as the fire-permafrost-vegetation interactions) under a rapidly changing climate.
Testing the Effect of Sulforaphane, a Compound Naturally Found in Cruciferous Vegetables, on Preventing Melanoma in Patients With a Prior History of Melanoma
ClinicalTrials.gov study NCT07040280. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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