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38 results for “Amazonian lowland”
Distribution. Amazonian lowlands of E Brazil S of the Amazon River, extending S to the cerrado biome in EC Brazil, primarily in the Rio Tapajos, Rio Xingu, and Rio Tocantins-Araguaia fluvial systems of Para, Maranhao, Tocantins, Minas Gerais, Goias, and Mato Grosso states. in Echimyidae
Distribution. Amazonian lowlands of E Brazil S of the Amazon River, extending S to the cerrado biome in EC Brazil, primarily in the Rio Tapajos, Rio Xingu, and Rio Tocantins-Araguaia fluvial systems of Para, Maranhao, Tocantins, Minas Gerais, Goias, and Mato Grosso states.
Distribution. Amazonian lowlands in S Venezuela, the Guianas, and NC Brazil; also recorded on Little Tobago I. in Cricetidae
Distribution. Amazonian lowlands in S Venezuela, the Guianas, and NC Brazil; also recorded on Little Tobago I.
Figure 7 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 7. Details of the male organs of the copulatory apparatus of Notogynaphallia urku sp. nov. in sagittal sections of the holotype (A, D, E, G, H) and paratype 1 (B, C, F). (A, B) Prostatic vesicle and proximal part of the male atrium; (C, D) proximal portion of the prostatic vesicle; (E, F) distal portion of the prostatic vesicle; (G, H) male atrium. Scale bars: A–C = 500 μm; D–H = 100 μm.
Figure 8 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 8. Details of the female organs of the copulatory apparatus of Notogynaphallia urku sp. nov. in longitudinal (A) and sagittal (B–F) sections. (A, C – E) holotype; (B, F) paratype 1). (A, B) ovaries; (C, D) ovovitelline ducts: lateral to the female atrium (C) and distal ascending portion (D); (E, F) distal portion of the female reproductive system. Scale bars: A, C–F = 100 μm; B = 200 μm.
Figure 4 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 4. Pharynx of Notogynaphallia urku sp. nov. Sagittal sections of the holotype (A) and paratype 1 (B). Scale bars: 1 mm.
Figure 6 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 6. Copulatory apparatus of Notogynaphallia urku sp. nov. Sagittal sections of the holotype (A) and paratype 1 (B). Scale bars: 1 mm.
Figure 3 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 3. Pre-pharyngeal region of Notogynaphallia urku sp. nov. (holotype). Transverse section (A) and details (B–E): dorsal to the intestine (B); ventral to the intestine (C); the sperm and ovovitelline ducts (D); and body margin (E). Scale bars: A = 1 mm; B = 250 μm; C = 50 μm; D, E = 100 μm.
Figure 2 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 2. Eyes of Notogynaphallia urku sp. nov. (holotype). (A) Photographs (a–f) showing the clear halos spreading from the anterior body region to the pre-pharyngeal region. (B, C) Longitudinal sections at the anterior body region, showing the monolobulated (B) and trilobulated (C) eyes. The boxes in Fig. A(b) indicate the approximate body region from which histological sections (B and C) were made. Scale bars: A(a–f) = 2 mm; B, C = 100 μm.
Figure 5 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 5. Schematic reconstruction, in sagittal view, of the copulatory apparatus of Notogynaphallia urku sp. nov. (holotype). Scale bar: 1 mm.
Figure 1 in A new species of land planarian (Platyhelminthes: Tricladida: Geoplanidae) from the Amazonian lowlands, Peru
Figure 1. External aspect of Notogynaphallia urku sp. nov. (A, C) Dorsal view of live specimens (A, holotype; C, paratype 1); (B) dorsal view after fixation (holotype); (D) ventral view of live specimen (holotype). The arrowheads indicate the region of the body that was damaged in the holotype and the arrows show the position of the mouth and gonopore, respectively. In Figures A, B, and D the anterior body region is on the left. In Figure C, the anterior body region is upwards. Scale bars: 10 mm.
Data from: Seasonal dynamics of flock interaction networks across a human-modified landscape in lowland Amazonian rainforest
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River network rearrangements promote speciation in lowland Amazonian birds
<p>Large Amazonian rivers impede dispersal for many species, but lowland river networks frequently rearrange, thereby altering the location and effectiveness of river-barriers through time. These rearrangements may promote biotic diversification by facilitating episodic allopatry and secondary contact among populations. We sequenced genome-wide markers to evaluate histories of divergence and introgression in six Amazonian avian species-complexes. We first tested the assumption that rivers are barriers for these taxa and found that even relatively small rivers facilitate divergence. We then tested whether species diverged with gene flow and recovered reticulate histories for all species, including one potential case of hybrid speciation. Our results support the hypothesis that river dynamics promote speciation and reveal that many rainforest taxa are micro-endemic, unrecognized and thus threatened with imminent extinction. We propose that Amazonian hyper-diversity originates in part from fine-scale barrier displacement processes –including river dynamics– which allow small populations to differentiate and disperse into secondary contact.</p>
Distribution. Scattered Amazonian lowland localities in NC Brazil S of Amazon River. in Cricetidae
Distribution. Scattered Amazonian lowland localities in NC Brazil S of Amazon River.
FIGURE 5 in When roads cross streams: fish assemblage responses to fluvial fragmentation in lowland Amazonian streams
FIGURE 5 | ANOVA results for assemblage structure in northeastern Amazonian streams among stream reach groups. A. Taxonomic structure; B. Functional structure. D: Downstream reaches from impoundments; I: Impounded reaches; U: Upstream reaches from impoundments.
FIGURE 4 in When roads cross streams: fish assemblage responses to fluvial fragmentation in lowland Amazonian streams
FIGURE 4 | Relative contribution of turnover and nestedness component to total beta diversity obtained after averaging pairwise dissimilarities (Sørensen index) between stream reaches at each stream. D: Downstream reaches from impoundments; I: Impounded reaches; U: Upstream reaches from impoundments.
River network rearrangements promote speciation in lowland Amazonian birds
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Distribution. Scattered Amazonian lowland localities in French Guiana, S Surinam, and neighboring Brazilian territories N of Amazon River. in Cricetidae
Distribution. Scattered Amazonian lowland localities in French Guiana, S Surinam, and neighboring Brazilian territories N of Amazon River.
F in Finding the host tree species of Notiobia nebrioides Perty (Coleoptera, Carabidae), a member of the seed-feeding guild at fruit falls in Amazonian non-inundated lowland rainforest
F. 1. Food niches for the Notiobia species community at Reserva Ducke, Central Amazonia.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.