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901 results for “Amazon Basin”
LBA-ECO LC-15 Amazon Basin Aboveground Live Biomass Distribution Map: 1990-2000
The amount and spatial distribution of forest biomass in the Amazon basin is a major source of uncertainty in estimating the flux of carbon released from land-cover and landuse change. Direct measurements of aboveground live biomass (AGLB) are limited to small areas of forest inventory plots and site-specific allometric equations that cannot be readily generalized for the entire basin. Furthermore, there is no space-borne remote sensing instrument that can measure tropical forest biomass directly. To determine the spatial distribution of forest biomass of the Amazon basin, we report a method based on remote sensing metrics representing various forest structural parameters and environmental variables, and more than 500 plot measurements of forest biomass distributed over the basin. A decision tree approach was used to develop the spatial distribution of AGLB for seven distinct biomass classes of lowland old-growth forests with more than 80% accuracy. AGLB for other vegetation types, such as the woody and herbaceous savanna and secondary forests, was directly estimated with a regression based on satellite data. Results show that AGLB is highest in Central Amazonia and in regions to the east and north, including the Guyanas. Biomass is generally above 300 Mg ha-1 here except in areas of intense logging or open floodplains. In Western Amazonia, from the lowlands of Peru, Ecuador, and Colombia to the Andean mountains, biomass ranges from 150 to 300 Mg ha-1. Most transitional and seasonal forests at the southern and northwestern edges of the basin have biomass ranging from 100 to 200 Mg ha-1. The AGLB distribution has a significant correlation with the length of the dry season. We estimate that the total carbon in forest biomass of the Amazon basin, including the dead and belowground biomass, is 86 Pg C with +/- 20% uncertainty.
LBA-ECO CD-06 Isotopic Composition of Carbon Fractions, Amazon Basin River Water
This data set includes measurements of standard geochemical variables, dissolved CO2, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), fine particulate organic carbon (FPOC), and coarse particulate organic carbon (CPOC) in samples taken from 60 Amazonian river locations across the Amazon Basin from 1991 to 2003 (Mayorga et al., 2005). The 14C and 13C isotopic composition of DIC was measured on samples collected between 1991 and 2003. The 14C composition of organic carbon fractions was measured on samples collected from 1995 through 1996. There are four comma-delimited data files with this data set. Note that site descriptions include a categorization of each site by topography according to the percentage of the drainage area above 1,000 m elevation (Mayorga et al., 2005). Only means of geochemical and carbon-fraction results are provided. Both individual 13C and 14C measurements and mean results are provided.
LBA-ECO CD-06 CO2 Exchange in River Systems Across the Amazon Basin: 2004-2007
This data set provides measurements of carbon dioxide flux rates (FCO2), gas transfer velocity (k), and partial pressures (pCO2) at 75 sites on rivers and streams of the Amazon River system in South America for the period beginning July 1, 2004, and ending January 23, 2007. Several fieldwork campaigns occurred between June 2004 and January 2007 in the Amazon River basin, with discharge conditions ranging from low to high flow. The sampled areas span the spectrum of chemical characteristics observed across the entire basin, including, for example, both low and high pH values and suspended sediment loads. There is one comma-delimited data file in this data set.
LBA-ECO CD-34 Hyperion 30-m Surface Reflectance, Amazon Basin: 2002-2005
This data set contains 20 multispectral surface reflectance images collected by the EO-1 satellite Hyperion sensor at 30-m resolution and covering the entire Amazon Basin for 2002 - 2005. All images were converted to GeoTiff format for distribution. The respective ENVI *.hdr files are included as companion files and contain image projection and band information.The selected multispectral images were processed using ENVI software as described in Chambers et al. (2009). Bands with uncalibrated wavelengths and those with low spectral response were removed leaving a spectral subset of generally 196 bands (some images have fewer). A cloud mask was developed using 2-d scatter plots of variable reflectance bands to highlight clouds as regions of interest (ROIs), allowing clouds and cloud edges to be masked. A de-streaking algorithm was then applied to the image to reduce variance in balance between the vertical columns. Apparent surface reflectance was calculated for this balanced image using the atmospheric correction algorithm ACORN in 1.5pb mode (AIG-LLC, Boulder, CO). The images (18 of the 20) were georeferenced using the corresponding Advanced Land Imager (ALI) satellite images.
LBA-ECO LC-15 Aerodynamic Roughness Maps of Vegetation Canopies, Amazon Basin: 2000
This data set provides physical roughness maps of vegetation canopies in the Amazon Basin. The images are estimates of aerodynamic roughness length (Z0) and zero plane displacement height (D0) at 1-km spatial resolution. The aerodynamic roughness length (Z0) is an important parameter to determine the vertical gradients of mean wind speed and the conditions for momentum transfer over a vegetated or bare rough surface.The maps were produced from a multivariate regression model algorithm developed from field-measured vegetation structure and remote-sensing data. The data input sources included Shuttle Radar Topography Mission (SRTM) (Saatchi, 2013), JERS-1, MODIS, and field data from vegetation biomass plots over the Amazon basin, as well as tower-based wind profile measurements, and roughness parameters from LBA tower sites. There are two GeoTIFF (.tif) files with this data set.
Figure 7 from: Henschel E, Bragança PHN, Rangel-Pereira F, Costa WJEM (2020) A new psammophilic species of the catfish genus Ammoglanis (Siluriformes, Trichomycteridae) from the Amazon River basin, northern Brazil. Zoosystematics and Evolution 96(1): 67-72. https://doi.org/10.3897/zse.96.48952
Figure 7 Habitat of Ammoglanis obliquus.
Figure 2 from: Henschel E, Bragança PHN, Rangel-Pereira F, Costa WJEM (2020) A new psammophilic species of the catfish genus Ammoglanis (Siluriformes, Trichomycteridae) from the Amazon River basin, northern Brazil. Zoosystematics and Evolution 96(1): 67-72. https://doi.org/10.3897/zse.96.48952
Figure 2 Live specimen of Ammoglanis obliquus: UFRJ 12448; 13.0 mm SL.
Figure 2 from: Soares IM, Azevedo-Santos VM, Benine RC (2017) Redescription of Moenkhausia megalops (Eigenmann, 1907), a widespread tetra from the Amazon basin (Characiformes, Characidae). Zoosystematics and Evolution 93(2): 255-264. https://doi.org/10.3897/zse.93.10837
Figure 2 - Moenkhausia megalops, INPA 48895, 41.9 mm SL, Brazil, Amazonas State, rio Japurá basin.
Figure 1 from: Azevedo-Santos VM, Benine RC (2016) A new species of Moenkhausia (Characiformes, Characidae) from the Içá River, Amazon Basin, northern Brazil. Zoosystematics and Evolution 92(2): 203-209. https://doi.org/10.3897/zse.92.10049
Figure 1 - Moenkhausia britskii, MZUSP 120691, holotype, 52.9 mm SL, from Içá River, Amazon basin.
FIGURE 1 in Feeding ecology of electric eel Electrophorus varii (Gymnotiformes: Gymnotidae) in the Curiaú River Basin, Eastern Amazon
FIGURE 1 | Study area: Curiaú River Environmental Protection Area in Macapá, Amapá, Brazil.
Figure 2 from: de Brito PS, Guimarães EC, Carvalho-Costa LF, Ottoni FP (2019) A new species of Aphyocharax Günther, 1868 (Characiformes, Characidae) from the Maracaçumé river basin, eastern Amazon. Zoosystematics and Evolution 95(2): 507-516. https://doi.org/10.3897/zse.95.36788
Figure 2 Caudal-fin of Aphyocharax brevicaudatus, holotype, CICCAA 02293, (male).
Figure 3 from: de Brito PS, Guimarães EC, Carvalho-Costa LF, Ottoni FP (2019) A new species of Aphyocharax Günther, 1868 (Characiformes, Characidae) from the Maracaçumé river basin, eastern Amazon. Zoosystematics and Evolution 95(2): 507-516. https://doi.org/10.3897/zse.95.36788
Figure 3 Type locality of Aphyocharax brevicaudatus sp. nov.
Fig. 8 in Redescription of the type species of Odontostilbe Cope, 1870 (Teleostei: Characidae: Cheirodontinae), and description of three new species from the Amazon basin
Fig. 8. Holotype of Odontostilbe caquetae, ANSP 70495, unsexed 28.0 mm SL.
Figure 5 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 5 - Dryotomicus oenophilis sp. n. female, A Lateral habitus B Frons.
Figure 9 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 9 - Aricerus sp. antenna.
Figure 11 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 11 - Dryotomicus puberulus elytral declivity.
Figure 8 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 8 - Dryotomicus woodrex sp. n. male genitalia, A Dorsal B Lateral.
Figure 7 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 7 - Dryotomicus woodrex sp. n. male, A Frons B Elytral declivity.
Figure 10 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 10 - Dryotomicus tuberculatus elytra.
Figure 6 from: Cognato A (2010) Resurrection of Dryotomicus Wood and description of two new species from the Amazon River Basin (Coleoptera, Curculionidae, Scolytinae, Phloeotribini). ZooKeys 56: 49-64. https://doi.org/10.3897/zookeys.56.518
Figure 6 - Dryotomicus woodrex sp. n. male. Habitus, A Dorsal B Lateral.
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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.