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517 results for “Floodplain”
FIGURE 1 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 1. Microscopic photographs of Pseudoaliinostoc sejongens. (A) Amorphous mucilage (am) at the colony edge; (B, C) Arrangement of trichomes in the colony; (D, E) Hormogonia; (F, G) Barrel-shaped of vegetative cells and rounded apical cell; (H, I) Rounded conical apical cell; (J) Firm trichome with partially visible firm sheath (sh); (K) Hyaline sheaths (Chinese ink); (L) Thin and hyaline sheaths (Chinese ink); (M–O) Variable size of intercalary heterocytes (ih); (P, Q) Akinetes (ak); (R) Spherical intercalary heterocyte and subelliptical terminal heterocyte (th); (S) Akinete and heterocyte in trichomes. Scale bars, 50 μm (A); 20 μm (B); 10 μm (C–S).
FIGURES 58–64 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 58–64. Eunotia parabidens from Patos Lake sediment samples, Upper Paraná River floodplain, Brazil. 58–63. LM. 64. SEM, external view of valve. Scale bars = 10 μm.
FIGURES 45–50 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 45–50. LM micrographs of Eunotia neomundana from Patos Lake sediment, Upper Paraná River floodplain, Brazil. Scale bar = 10 μm.
FIGURES 51–57 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 51–57. Eunotia papilio from Patos Lake sediment samples, Upper Paraná River floodplain, Brazil. 51–56. LM. 57. SEM, external view of valve. Scale bars = 10 μm.
FIGURES 37–44 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 37–44. Eunotia monodon from Patos Lake and Garças Lake sediment samples, Upper Paraná River floodplain, Brazil. 37–43. LM. 44. SEM, external view of valve. Scale bars = 10 μm.
FIGURES 20–29 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 20–29. Eunotia deformis from Patos Lake and Garças Lake sediment samples, Upper Paraná River floodplain, Brazil. 20–28. LM. 29. SEM, external view of valve. Scale bars = 10 μm.
FIGURES 12–19 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 12–19. Eunotia deficiens from Patos Lake and Garças Lake sediment samples, Upper Paraná River floodplain, Brazil. 12–18. LM. 19. SEM, external view of valve. Scale bars = 10 μm.
FIGURES 9–11 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 9–11. SEM images of Eunotia nupeliana sp. nov. from type material, Patos Lake sediment, Upper Paraná River floodplain, Brazil. External views of valves. Type population (Nupélia UEM! 18099). Scale bars = 10 μm.
FIGURES 2–8 in Eunotia Ehrenberg (Eunotiaceae, Bacillariophyta) in a subtropical floodplain: a new species and taxonomic contributions
FIGURES 2–8. LM images of Eunotia nupeliana sp. nov. from type material, Patos Lake sediment, Upper Paraná River floodplain, Brazil. 2. Holotype specimen 3–8. Type population (Nupélia UEM! 18099). Scale bars = 10 μm.
FIGURES 2–38 in Staurosirella paranaensis sp. nov., a new epiphytic freshwater diatom (Bacillariophyceae) from the Paraná River floodplain, Brazil, South America
FIGURES 2–38. LM. Staurosirella paranaensis sp. nov. from type material. 2–34. LM. 2–9, 13–34. Valve view. 10–12. Girdle view. 35– 38. SEM–External view. Valve views depicting characteristics of the central narrow sternum, striae, and apical pore fields. Vimines long and narrow becoming shorter toward the sternum. Striae running uninterrupted from valve face to mantle, with areolae slit-like. 36–37. Apical pore fields. Broken spines suggesting initially hollow then becoming a solid structure. LM scale bar 10 μm, in SEM the scale bars are identified in the images. Figure 21* indicates the holotype specimen.
FIGURES 39–44 in Staurosirella paranaensis sp. nov., a new epiphytic freshwater diatom (Bacillariophyceae) from the Paraná River floodplain, Brazil, South America
FIGURES 39–44. SEM. Staurosirella paranaensis sp. nov. from type material. 39–41. Girdle view of a complete frustule showing wider valvocopulae still attached to both valves. 42. Union of two valves by spines and formation of colonies. 43. Spines detail showing solid spines and an apically elongated structure with a lamina that becomes spatulate with two prominences in shape at the top. 44. View of the spine's junction of copula, spines terminating near or over the neighboring valve areolae. Scale bars are identified in the SEM images.
Figure 3 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Figure 3. Multivariate vocal space of lowland tailorbirds in the O. chaktomuk – O. atrogularis – O. ruficeps– O. sepium clade from discriminant analyses based on 12 song traits. Scatter plot of the first two canonical functions that discriminated songs of O. chaktomuk, O. atrogularis, O. ruficeps and O. sepium. represent O. chaktomuk;, O. atrogularis;, O. ruficeps; +, O. sepium.
Figure 2 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Figure 2. Box plots of bill-length (to skull) divided by wing-length of (a) males of Orthotomus chaktomuk (n = 3), O. atrogularis nitidus (n = 15), O. ruficeps cineraceus (n = 14) and O. sepium sepium (n = 20); (b) females of O. chaktomuk (n = 2), O. a. nitidus (n = 10), O. r. cineraceus (n = 6) and O. s. sepium (n = 8); (c) males and females of O. chaktomuk (n = 5), O. a. nitidus (n = 25), O. r. cineraceus (n = 20) and O. s. sepium (n = 28). Small squares represent the median; box indicates 50% of samples; bars indicate maximum and minimum.
Plate 4 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Plate 4. Orthotomus chaktomuk (a–b) adult males in fresh plumage, 21 November 2012 (J. A. Eaton); (c–d) adult male in active moult (holotype), 8 August 2012 (NHMUK 2012.9.1; J. C. Eames); (e) adult male in worn plumage, 29 July 2012 (A. J. I. John); (f) adult female in fresh plumage, 21 November 2012 (J. A. Eaton); (g) adult female in worn plumage, 29 July 2012 (A. J. I. John); (h) immature male pre-moult, 16 July 2012 (A. J. I. John); (i) immature male in active moult, 29 July 2012 (A. J. I. John); (j) immature female in active moult, 8 August 2012 (NHMUK 2012.9.5; J. C. Eames); (k) subadult female in active moult, 9 August 2012 (NHMUK 2012.9.4; J. C. Eames).
Plate 3 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Plate 3. Specimens of the holotype of Orthotomus chaktomuk and closely related species (all males): (a) dorsal, (b) ventral and (c) lateral views (from left to right of O. chaktomuk, O. sepium sepium, O. ruficeps cineraceus and O. atrogularis nitidus). Harry Taylor © Natural History Museum, London.
Plate 2 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Plate 2. Specimens of O. chaktomuk: (a) dorsal, (b) ventral and (c) lateral views of the holotype and four paratypes (from left to right NHMUK 2012.9.1, 2012.9.2, 2012.9.3, 2012.9.4, 2012.9.5). Harry Taylor © Natural History Museum, London.
Plate 1 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Plate 1. Dorsal, ventral and lateral views of the holotype of O.chaktomuk. Harry Taylor © Natural History Museum, London.
Figure 4. The Orthotomus chaktomuk, O. atrogularis, O in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Figure 4. The Orthotomus chaktomuk, O. atrogularis, O. ruficeps, and O. sepium clade extracted from the entire Orthotomus phylogeny, which was constructed from concatenated DNA sequences of ND2, MUSK, and TGFβ2 via Bayesian phylogenetic inference as described in Sheldon et al. (2012). Numbers along branches indicate Bayesian posterior probabilities. The topology is the same as ND2 and MUSK trees by themselves.
Figure 1 in A new species of lowland tailorbird (Passeriformes: Cisticolidae: Orthotomus) from the Mekong floodplain of Cambodia
Figure 1. Distribution of records of Orthotomus chaktomuk and O. atrogularis within and close to the floodplain of the Mekong, Tonle Sap and Bassac rivers.
Data for: Widespread wood placement and regrading drive lateral connectivity and reworking of the channel and floodplain in a valley bottom reset to stage 0
<p>Valley bottom process reset, or the excavation of high surfaces and fill of incised channels combined with large wood addition, is a new method for creating multi-channel river-wetland corridors (also referred to as Stage 0 valley bottoms). Valley bottom process reset seeks to increase lateral flow and sediment connectivity to retain flow and sediment and kickstart geomorphic processes that may sustain aquatic and riparian habitats. This anthropogenic intervention provides an opportunity to examine relationships among wood-induced hydraulic roughness, valley bottom topography, and geomorphic processes such as overbank flow and sediment transport, avulsion, sediment retention, and pool scour. Here, I present a 6-year case study of a two-phase valley bottom process reset along Deer Creek, OR which indicates that kickstarting processes that reshape the floodplain requires a substantial increase in roughness and hydrologic connectivity. A first phase of construction enhanced hydrologic but not sediment connectivity, largely failing to kickstart avulsion and floodplain reworking even during a likely 2- to 5-year recurrence interval flood. A second, more intensive phase of construction substantially reduced the threshold flow necessary for overbank flow and incision of floodplain reworking, as evidenced by the occurrence of these processes after only a < 2-year recurrence interval flood. During this flood, a spatially distributed wood lattice rearranged into discrete jams that scoured pools, retained sediment, and drove geomorphically effective overbank flows. While valley bottom regrading likely contributed to these geomorphic effects, the spatial correlation between newly incised floodplain channels and areas of wood aggregation indicates a substantial role of wood-induced hydraulic roughness and channel blockage. Wood drove floodplain reworking via two mechanisms: in-channel wood jams backwatered and constructed flow into the floodplain, and small wood jams formed in the floodplain forest further constricted flow through nascent channels to facilitate channel incision.</p>
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