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57 results for “Amazonian River”
Data from: Arboreal ant abundance tracks primary productivity in an Amazonian whitewater river system
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Data from: Bird assemblages on Amazonian river islands: patterns of species diversity and composition
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Data from: Using river color to predict Amazonian floodplain forest avifauna in the world’s largest black-water river basin
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The relative role of rivers, environmental heterogeneity and species traits in driving compositional changes in Southeastern Amazonian bird assemblages
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Fig. 6 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams
Fig. 6. Length-at age distribution and von Bertalanffy growth function (solid lines) of Brachyplatystoma rousseauxii: a. females (N = 142); b. males (N = 95); and c. females, males and unsexed individuals pooled (N = 497) in the lower / middle (Brazil) and in the upper (Bolivia and Peru) Madeira River basin. In order to improve modelling for females (a) and males (b), unsexed individuals <60 cm (black dots) were also used.
Fig. 2 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams
Fig. 2. Transverse thin sections of Brachyplatystoma rousseauxii's otoliths showing: a. one ring; b. and c. two rings; d. eight rings; e. ten rings; and f. twenty rings. The yellow line marks the rings.
Fig. 7.a. Relationship between fish standard length and otolith radius for Brachyplatystoma rousseauxii below 80 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams
Fig. 7.a. Relationship between fish standard length and otolith radius for Brachyplatystoma rousseauxii below 80 cm (black circles, black line: y = 0.031x + 0.209, r² = 0.805, P <0.001) and above 80 cm (white triangles, broken line: y = 0.034x – 0.223, r² = 0.328, P <0.001); and b. relationship between fish age and otolith radius for B. rousseauxii below 80 cm (black circles, black line: y = 0.887ln(x) + 1.567, r² = 0.879, P <0.001) and above 80 cm (white triangles, broken line: y = 0.209ln(x) + 2.055, r² = 0.822, P <0.001), both in Madeira River basin.
Fig. 1 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams
Fig. 1. Map of the sampling sites of Brachyplatystoma rousseauxii in the Madeira River basin. 1- Puerto Maldonado, 2- Rurrenabaque, 3-Puerto Villarroel, 4-Surpresa, 5- Cachuela Esperanza, 6-Iata/Vila Murtinho, 7-São Sebastião, 8-São Carlos, 9- Calama and 10- Humaitá.
Fig. 3 in Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams
Fig. 3. Mean and standard deviation (SD) of each growth ring radius in otoliths of Brachyplatystoma rousseauxii from the Madeira River basin.
Data from: Effects of a major Amazonian river confluence on the distribution of floodplain forest avifauna
<p><strong>Aim</strong>: Although "river color" or water type is an important determinant of Amazonian floodplain biodiversity, the relevance of mixing distinct water types at river confluences to the distribution of terrestrial floodplain fauna has been largely overlooked. We investigated how the influx of a sediment-rich whitewater tributary affects the floodplain forest avifauna along the world's largest blackwater river.</p> <p><strong>Location</strong>: Northwestern Brazilian Amazon</p> <p><strong>Taxon</strong>: Birds</p> <p><strong>Methods</strong>: We sampled floodplain avifauna and retrieved estimates of sediment concentration in the water (the main parameter in river-water classification) at 52 sites, along the Negro (blackwater) and Branco (whitewater) rivers, above and below their confluence. We compared species richness and composition using analyses of variance, ordinations, generalized linear models and indicator species analyses.</p> <p><strong>Results</strong>: Bird species composition on the lower Rio Negro (below the confluence) was distinct from both the upper Negro (above the confluence) and the Branco, and species richness on the Negro increased below the confluence. Typical whitewater bird species occurring on the Branco were found exclusively or predominantly along the left side of the lower Rio Negro, where the Branco's muddy waters seem to be channeled. Overall avian compositional variation among sites was correlated with sediment concentration in the water, a determinant of floodplain forest structure.</p> <p><strong>Main Conclusions</strong>: The influx of the muddy waters of the Rio Branco into the Rio Negro promotes the co-occurrence of bird species that upstream are segregated by river type, increasing species richness at the landscape scale. Rather than just representing a potential blackwater barrier between whitewater systems, the lower Rio Negro comprises a unique biogeographical transition zone, with a mixed avifauna occurring in a mosaic of varied floodplain forest types. Our results suggest that confluences of large rivers of distinct water types represent a significant factor determining species distributional boundaries and geographic patterns of Amazonian floodplain biodiversity.</p>
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.
Data from: Effects of a major Amazonian river confluence on the distribution of floodplain forest avifauna
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River network rearrangements promote speciation in lowland Amazonian birds
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Data from: Hybridization in headwater regions, and the role of rivers as drivers of speciation in Amazonian birds
Many understory birds and other groups form genetically differentiated subspecies or closely related species on opposite sides of major rivers of Amazonia, but are proposed to come into geographic contact in headwater regions where narrower river widths may present less of a dispersal barrier. Whether such forms hybridize in headwater regions is generally unknown, but has important implications to our understanding of the role of rivers as drivers of speciation. We used a dataset of several thousand SNPs to show that seven taxon pairs which differentiate across a major Amazonian river come into geographic contact and hybridize in headwater regions. All taxon pairs possessed hybrids with low numbers of loci in which alleles were inherited from both parental species, suggesting they are backcrossed with parentals, and indicating gene flow between parental populations. Ongoing gene flow challenges rivers as the sole cause of in situ speciation, but is compatible with the view that the wide river courses in the heart of Amazonia may have driven interfluvial divergence during episodes of wet forest retraction away from headwater regions. Taxa as old as 4 Ma in our Amazonian dataset continue to hybridize at contact zones, suggesting reproductive isolation evolves at a slow pace.
Data from: Hybridization in headwater regions, and the role of rivers as drivers of speciation in 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.
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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)
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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.