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517 results for “floodplain”
Fig. 1 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil
Fig. 1. Centromochlus orca, new species, holotype, INPA 50870, female, 56.8 mm SL, mouth of Igarapé Jamari with lago de Terra Santa, rio Nhamundá basin, middle Amazonas basin, Pará State, Brazil. Lateral (a), dorsal (b) and ventral (c) views.
Data from: Drift happens: molecular genetic diversity and differentiation among populations of jewelweed (Impatiens capensis Meerb.) reflect fragmentation of floodplain forests
Landscape features often shape patterns of gene flow and genetic differentiation in plant species. Populations that are small and isolated enough also become subject to genetic drift. We examined patterns of gene flow and differentiation among 12 floodplain populations of the selfing annual jewelweed (Impatiens capensis Meerb.) nested within four river systems and two major watersheds in Wisconsin, USA. Floodplain forests and marshes provide a model system for assessing the effects of habitat fragmentation within agricultural/urban landscapes and for testing whether rivers act to genetically connect dispersed populations. We generated a panel of 12,856 single nucleotide polymorphisms and assessed genetic diversity, differentiation, gene flow, and drift. Clustering methods revealed strong population genetic structure with limited admixture and highly differentiated populations (mean multilocus FST = 0.32, FST' = 0.33). No signals of isolation by geographic distance or environment emerged, but alleles may flow along rivers given that genetic differentiation increased with river distance. Differentiation also increased in populations with fewer private alleles (R2 = 0.51) and higher local inbreeding (R2 = 0.22). Populations varied greatly in levels of local inbreeding (FIS = 0.2 to 0.9) and FIS declined in smaller, more isolated populations. These results suggest that genetic drift dominates other forces in structuring these Impatiens populations. In rapidly changing environments, species must migrate or genetically adapt. Habitat fragmentation limits both processes, potentially compromising the ability of species to persist in fragmented landscapes.
FIGURE 1. Simpsonichthys suzarti, MCP 34088 in Simpsonichthys suzarti sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual fish from the Rio Pardo floodplains, northeastern Brazil
FIGURE 1. Simpsonichthys suzarti, MCP 34088, male, holotype, 28.6 mm SL (about one month after collection); Brazil: Bahia: Canavieiras.
FIGURE 2. Simpsonichthys suzarti, UFRJ 5810 in Simpsonichthys suzarti sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual fish from the Rio Pardo floodplains, northeastern Brazil
FIGURE 2. Simpsonichthys suzarti, UFRJ 5810, female, paratype, 28.3 mm SL (about one month after collection); Brazil: Bahia: Canavieiras.
Fig. 3 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 3. Mongolodiaptomus mekongensis, new species, female. A, antenna; B, mandible; C, maxillule; D, maxilla; E, maxilliped. Scale bar = 100 µm.
Fig. 7 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 7. Mongolodiaptomus mekongensis, new species, male. A, P5 in posterior view; B, P5 in anterior view. Scale bar = 100 μm.
Fig. 2 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 2. Mongolodiaptomus mekongensis, new species, SEM photographs of female (A–I). A, habitus, dorsal view; B, rostrum, frontal view; C, pediger 5 and urosome, dorsal view (white arrow pointed to spines); D, caudal rami, ventral view; E, P5 in anterior view; F, P5 in posterior view; G, P5 Exp-2–3 in anterior view; H, P5 Exp-2–3 in posterior view; I, Enp-1–2 in anterior view, white arrow indicates the segmented Enp.
Fig. 8 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 8. Distribution map of Mongolodiaptomus mekongensis, new species, in the lower Mekong River Basin. A, species distribution in southeast Asia indicates with different coloured circles (Thailand: violet = Ubon Ratchathani Province; Laos: blue = Champasak Province; Cambodia: green = Steung Treng Province, yellow = Kratié Province, red = Kampong Thom Province, white = Siem Reap Province, black = Battambang Province; Vietnam: grey = Binh Phuoc Province); B, species distribution in Ubon Ratchathani Province from Thailand (an area of Ubon Ratchathani indicated with shaded black in A), 1–31 = sampling site.
Fig. 1 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 1. Mongolodiaptomus mekongensis, new species, female. A, habitus, dorsal view; B, rostrum anterior view; C, pediger 5 and urosome, dorsal view; D, urosome, ventral view (without caudal rami); E, pediger 5 and urosome, right lateral view (without caudal rami); F, pediger 5 and urosome, left lateral view (without caudal rami); G, antennule. Scale bar = 200 µm.
Fig. 5 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 5. Mongolodiaptomus mekongensis, new species, SEM photographs, male (A–M). A, habitus, dorsal view; B, lateral wings, genital somite, and urosomites 2–3, dorsolateral view (white arrow pointed to spines and black one pointed to seta); C, pediger 5, genital somite, and urosomites 2–3, dorsal view; D, right caudal ramus, ventral view (white arrow pointed spiniform process); E, P5 in posterior view; F, the right coxal spine, and basis of P5 in posterior view (white arrow pointed to spiniform process on posterior lobe); G, intercoxal plate, and basis of P5 in posterior view (white arrow pointed to hyaline membranes); H, the right P5 Exp-1–2 and Enp in posterior view; I, the right P5 Exp-1–2 in anterior view (white arrow pointed to spiniform processes); J, the left P5 basis, Exp and Enp in posterior view (white arrow pointed to longitudinal chitinous ridge); K, the left P5 Exp-1–3 and Enp in posterior view; L, P5 in anterior view; M, the left P5 Exp and Enp in anterior view.
Fig. 6 in Mongolodiaptomus mekongensis, a new species of copepod (Copepoda, Calanoida, Diaptomidae) from temporary waters in the floodplain of the lower Mekong River Basin
Fig. 6. Mongolodiaptomus mekongensis, new species, male. A, habitus, dorsal view; B, urosome, right lateral view; C, urosome, ventral view (black arrows indicate chitinous spines and ridge on right caudal ramus); D, the right antennule: D1, segment 1–12; D2, segment 13–22. Scale bar = 100 µm.
Fig. 2 in First Report of Colacium vesiculosum Ehrenberg 1853 (Euglenophyceae), as Epibiont on Planktonic Copepods (Crustacea, Copepoda), in a Brazilian Floodplain Lake
Fig. 2. Mean abundance of hosts and mean infestation prevalence on the total or on each live stage of the copepods. A represents those aspects of the epibiotic relationship on N. amazonicus and on B, those on T. minutus.
Fig. 2 in Feeding strategy of the introduced Astronotus crassipinnis (Cichlidae) in upper Paraná river floodplain
Fig. 2. Ordination by principal coordinate analysis (PCoA) of the food items for the size classes of Astronotus crassipinnis (Heckel, 1840) along the upper Paraná River floodplain. Axis 1 separated the diet of Class I (spheres on the right) from the other two classes (square and diamond in the left, with little variability) (Chiro, Chironomidae larvae; Ostra, Ostracoda; Ephe, Ephemeroptera).
Fig. 3 in Feeding strategy of the introduced Astronotus crassipinnis (Cichlidae) in upper Paraná river floodplain
Fig. 3. Boxplot of the predation rate of Astronotus crassipinnis (Heckel, 1840) (introduced species) and Hoplias sp. 2 (native species) in relation to prey type Moenkhausia sanctafilomenae (Steindachner, 1907) (Fish) and Macrobrachium amazonicum (Heller, 1862) (Shrimp).
Fig. 2 in Predominance of Vibidia duodecimguttata (Poda, 1761) in the assemblages of ladybird beetles (Coleoptera: Coccinellidae) overwintering in floodplain forests
Fig. 2. Relationships between gravimetric water content in the soil of ladybird sampling sites and the total ladybird abundance (A), and the abundance of V. duodecimguttata (B).
Figs. 16-23 in Pseudofilamentous desmids (Zygnematophyceae) from an Amazonian floodplain lake (Macapá, AP, Brazil)
Figs. 16-23. Pseudofilamentous desmids of Curralinho Lake, Macapá, Amapá, Brazil. 16 A-B. Hyalotheca dissiliens var. dissiliens. A. fungi in the cell wall of the algae, B. detailed cells; 17 A-B. H. javanica. A. detailed pseudofilament, B. detailed cells; 18. Mateola curvata; 19 A-B. Phymatodocis nordstedtiana var. nordstedtiana f. minor. A. pseudofilament frontal view, B. pseudofilament lateral view; 20. Spondylosium desmidiiforme; 21. S. pulchrum var. pulchrum; 22. S. rectangulare var. rectangulare; 23 A-B. S. rectangulare var. goyazense, detailed cells and pseudofilaments. Scale bars = 10 µm.
Figs. 3-15 in Pseudofilamentous desmids (Zygnematophyceae) from an Amazonian floodplain lake (Macapá, AP, Brazil)
Figs. 3-15. Pseudofilamentous desmids of Curralinho Lake, Macapá, Amapá, Brazil. 3 A-C. Bambusina borreri. A, B. detailed cells; C. detailed pseudofilament; 4. B. borreri var. brasiliensis; 5 A-B. B. borreri var. majus, detailed cells and pseudofilaments; 6. Desmidium baileyi var. baileyi f. bailey; 7 A-B. D. elegans. A. detailed pseudofilament, B. detailed cell; 8 A-B. D. graciliceps var. graciliceps. A. frontal view of the pseudofilament, B. slight modification of the pseudofilament frontal view; 9. D. graciliceps var. groenbladii; 10 A-C. D. longatum. A. pseudofilament frontal view, B. formation of the elongate conjugation tube, C. zygospore; 11 A-B. D. quadratum var. quadratum. A. detailed pseudofilament, B. detailed cells; 12. D. quadratum var. constrictum; 13 A-B. Groenbladia neglecta var. neglecta. A. detailed pseudofilament, B. detailed cells; 14 A-B. G. neglecta var. elongata. A. detailed pseudofilament, B. detailed cells; 15. Haplozyga armata var. armata. Scale bars = 10 µm.
Figs. 2 A-B in Pseudofilamentous desmids (Zygnematophyceae) from an Amazonian floodplain lake (Macapá, AP, Brazil)
Figs. 2 A-B. Sampling station at Curralinho Lake. A. The dry season or less rainy period; B. The rainy season or flood period.
Figs. 1 A-C in Pseudofilamentous desmids (Zygnematophyceae) from an Amazonian floodplain lake (Macapá, AP, Brazil)
Figs. 1 A-C. Geographic localization of the Curralinho Lake, "Ressaca" area, Macapá, Amapá, Brazil. A. Localization of the Amapá state (AP) in Brazil (green color); B. Curiaú River basin, located in the Curiaú Enviroment Protection Area is highlighted in black; C. The sampling station at Curralinho Lake is a red circle.
Data for: Channel mobility and floodplain reworking across river planform morphologies
<p>Source-to-sink transfer of sediment and organic carbon (OC) is regulated by river mobility. Quantifying trends in river mobility is, however, challenging due to diverse planform morphologies (e.g., meandering, braided) and measurement methods. Here, we utilize a state-of-the-art remote-sensing method applicable to all planform morphologies to quantify the mobility timescales of 80 rivers worldwide. Results show that, across the continuum from meandering to braided rivers, there is a systematic reduction in timescale of channel mobility and—to a lesser extent—the timescale of floodplain reworking. This leads to an overall decrease in the efficiency at which braided river channels rework old floodplain material compared to their meandering counterparts. Reduced reworking efficiency of braided channels stems from their relatively smaller channel-belt areas relative to their channel area. Results suggest that river-mobility timescales can help us characterize sediment and OC storage and transit times from remote sensing.</p>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.