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55 results for “satellite tracks”
Figure 3A-E in Variability in Reception Duration of Dual Satellite Tags on Sea Turtles Tracked in the Pacific Ocean
Figure 3A-E. Number of transmissions by month for five turtles that have over 30 days difference in tag duration between the two tags on each turtle. Turtle number on each graph is connected to the numbers assigned to the turtle in Table 1. Legends indicate which tag ID goes with each color on the graphic.
Figure 7 A-E in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 7 A-E. Home ranges for four females and one male green turtle that migrated to Kahului, Maui from French Frigate Shoals. Large colored circles indicate 1 km radius around each position. Black circles indicate positions with LC 1, 2 or 3 data. Black lines outline the Minimum Convex Polygons for Minimum Home Range and Full Home Range areas.
Figure 3A-F. Migration pathways from French Frigate Shoals breeding site for 15 females and 2 in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 3A-F. Migration pathways from French Frigate Shoals breeding site for 15 females and 2 males. The release location is shown with an open star and final tracking position is indicated by a colored circle. Year of tracking is indicated on the map.
Figure 10 A-C in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 10 A-C. Home ranges for two females and one male green turtle at the Laniakea, O'ahu foraging area prior to their migration to French Frigate Shoals. Large colored circles indicate 1 km radius around each position. Black circles indicate positions with LC 1, 2 or 3 data. Black lines outline the Minimum Convex Polygons for Minimum Home Range areas. Male 23474 moved to Kāne'ohe Bay after initially returning to Laniakea.
Figure 1 in Variability in Reception Duration of Dual Satellite Tags on Sea Turtles Tracked in the Pacific Ocean
Figure 1. Distribution of dual tagged turtles in the North Pacific Ocean. Turtle numbers are connected to those in Table 1. Ovals show basic area covered by each turtle's track.
Figure 6A-D in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 6A-D. Home ranges for four female green turtles that migrated to Kāne'ohe, O'ahu from French Frigate Shoals. Large colored circles indicate 1 km radius around each position. Black circles indicate positions with LC 1, 2 or 3 data. Black lines outline the Minimum Convex Polygons for Minimum Home Range and Full Home Range areas. Two Minimum Home Ranges are indicated for female 4801_92 in Figure 6B.
Figure 2 in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 2. Composite view of the ocean pathways by the 20 green turtles tracked during their breeding migrations linked to the colonial nesting site of French Frigate Shoals. Turtles were randomly selected for satellite tagging between 1992-2014.
Figure 1 in Ocean pathways and residential foraging locations for satellite tracked green turtles breeding at French Frigate Shoals in the Hawaiian Islands
Figure 1. Hawaiian Archipelago located in an isolated region of the Central North Pacific. Colonial breeding by green turtles in abundance occurs at the mid-point location of French Frigate Shoals (Balazs et al 2015)
Data for: Tracking the temporal dynamics of insect defoliation by high-resolution radar satellite data
<p><span>1. Quantifying tree defoliation by insects over large areas is a major challenge in forest management, but it is essential in ecosystem assessments of disturbance and resistance against herbivory. However, the trajectory from leaf-flush to insect defoliation to refoliation in broadleaf trees is highly variable. Its tracking requires high temporal- and spatial-resolution data, particularly in fragmented forests. </span></p> <p><span>2. In a unique replicated field experiment manipulating gypsy moth <i>Lymantria dispar</i> densities in mixed-oak forests, we examined the utility of publicly accessible satellite-borne radar (Sentinel-1) to track the fine-scale temporal trajectory of defoliation. The ratio of backscatter intensity between two polarizations from radar data of the growing season constituted a canopy development index (CDI) and a normalized CDI (NCDI), which were validated by optical (Sentinel-2) and terrestrial laser scanning (TLS) data as well by intensive caterpillar sampling from canopy fogging. </span></p> <p><span>3. The CDI and NCDI strongly correlated with optical and TLS data (Spearman's ρ=0.79 and 0.84, respectively). The ∆NCDI<sub><sub>Defoliation</sub><sub> (</sub><sub>A</sub><sub>-</sub><sub>C</sub><sub>)<i> </i></sub></sub>significantly explained caterpillar abundance (R<sup>2</sup>=0.52). The NCDI at critical time-steps and ΔNCDI related to defoliation and refoliation well discriminated between heavily and lightly defoliated forests. </span></p> <p><span>4. We demonstrate that the high spatial and temporal resolution and the cloud independence of Sentinel-1 radar potentially enable spatially unrestricted measurements of the highly dynamic canopy herbivory. This can help monitor insect pests, improve the prediction of outbreaks, and facilitate the monitoring of forest disturbance, one of the high priority Essential Biodiversity Variables, in the near future.</span></p>
Data from: Satellite tracking of American Woodcock reveals a gradient of migration strategies
Open the record for dataset details and reuse information.
Data for: Tracking the temporal dynamics of insect defoliation by high-resolution radar satellite data
Open the record for dataset details and reuse information.
Data and scripts for: Satellite-tracking reveals sex-specific migration distance in green turtles (Chelonia mydas)
<p>Data derivates and analysis scripts (in R) used for the paper "Satellite-tracking reveals sex-specific migration distance in green turtles (<em>Chelonia mydas</em>)", published in Biology Letters, on analyzing male and female green turtle movements in West Africa.</p>
Dataset for: ASTA (Automated Satellite Tracking for Astronomy)
<p>This is the dataset used in the paper Automated Detection of Satellite Trails in Ground-Based Observations Using U-Net and Hough Transform for Training, Test and Validation sets. </p> <p>Additionally, it contains the data table with both matched and unmatched trails detected and discussed in the paper's Application section.<br><br>If you use the dataset, please cite the appropriate DOIs.</p>
Figure 2 in Variability in Reception Duration of Dual Satellite Tags on Sea Turtles Tracked in the Pacific Ocean
Figure 2. Example of dual tag attachment to a loggerhead turtle.
SIF and CLM5 outpfile files to support Kunik et al "Satellite-based solar-induced fluorescence tracks seasonal and elevational patterns of photosynthesis in California's Sierra Nevada mountains"
<p>These files contain 0.04° monthly sampled TROPOMI SIF, corrected for length of day and topography ("SIFdc_dem") over the Sierra Nevada region of California, along with Community Land Model (CLM) v5.0 point and regional simulation output. CLM5.0 simulations with prognostic vegetation state (CLM5.0-BGC, files begninning with "clm5_") and with satellite phenology (CLM5.0-SP, files beginning with "clm5_SP_") are provided. </p>
Data from: The value of satellite tracking across multiple years to identify key areas for conservation
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Data from: Filling knowledge gaps in a threatened shorebird flyway through satellite tracking
1. Satellite-based technologies that track individual animal movements enable the mapping of their spatial and temporal patterns of occurrence. This is particularly useful in poorly studied or remote regions where there is a need for the rapid gathering of relevant ecological knowledge to inform management actions. One such region is East Asia, where many intertidal habitats are being degraded at unprecedented rates and shorebird populations relying on these habitats show rapid declines. 2. We examine the utility of satellite tracking to accelerate the identification of coastal sites of conservation importance in the East Asian-Australasian Flyway. In 2015–2017 we used solar-powered satellite transmitters to track the migration of 32 great knots (Calidris tenuirostris), an 'Endangered' shorebird species widely distributed in the Flyway and fully dependent on intertidal habitats for foraging during the non-breeding season. 3. From the great knot tracks, a total of 92 stopping sites along the Flyway were identified. Surprisingly, 63% of these sites were not known as important shorebird sites before our study; in fact, every one of the tracked individuals used sites that were previously unrecognized. 4. Site knowledge from on-ground studies in the Flyway is most complete for the Yellow Sea and generally lacking for Southeast Asia, Southern China, and Eastern Russia. 5. Policy implications: Satellite tracking highlighted coastal habitats that are potentially important for shorebirds but lack ecological information and conservation recognition, such as those in Southern China and Southeast Asia. At the same time, the distributional data of tracked individuals can direct on-ground surveys at the lesser-known sites to collect information on bird numbers and habitat characteristics. To recognize and subsequently protect valuable coastal habitats, filling knowledge gaps by integrating bird tracking with ground-based methods should be prioritized.19-Jun-2019
First Atlantic satellite tracks of lost years green turtles support the importance of the Sargasso Sea as a sea turtle nursery
<p>In-water behaviour and long-term movements of oceanic-stage juvenile sea turtles are not well described or quantified. This is due to technological or logistical limitations of tracking small, fast-growing animals across long distances and time-periods within marine habitats. Here we present the first long-term offshore tracks of oceanic green turtles (<i>Chelonia mydas</i>) in western North Atlantic waters. Using a tag attachment technique developed specifically for young (<1 year old) green turtles, we satellite tracked 21 oceanic-stage green turtles (<19 cm straight carapace length) up to 152 days using small, solar-powered transmitters. We verify that oceanic-stage green turtles: (<i>i</i>) travel to and remain within oceanic waters; (<i>ii</i>) often depart the Gulf Stream and North Atlantic Subtropical Gyre currents, orienting toward waters associated with the Sargasso Sea; (<i>iii</i>) remain at the sea surface, using thermally-beneficial habitats that promote growth and survival of young turtles; and (<i>iv</i>) green turtles orient differently compared to same stage loggerhead turtles (<i>Caretta caretta</i>). Combined with satellite tracks of oceanic-stage loggerhead turtles, our work identifies the Sargasso Sea as an important nursery habitat for North Atlantic sea turtles, supporting a growing body of research that suggests oceanic-stage sea turtles are behaviourally more complex than previously assumed.</p>
Data from: When and where does mortality occur in migratory birds? Direct evidence from long-term satellite tracking of raptors
1. Information about when and where animals die is important to understand population regulation. In migratory animals, mortality might occur not only during the stationary periods (e.g. breeding and wintering) but also during the migration seasons. However, the relative importance of population limiting factors during different periods of the year remains poorly understood, and previous studies mainly relied on indirect evidence. 2. Here we provide direct evidence about when and where migrants die by identifying cases of confirmed and probable deaths in three species of long-distance migratory raptors tracked by satellite telemetry. 3. We show that mortality rate was about six times higher during migration seasons than during stationary periods. However, total mortality was surprisingly similar between periods, which can be explained by the fact that risky migration periods are shorter than safer stationary periods. Nevertheless, more than half of the annual mortality occurred during migration. We also found spatiotemporal patterns in mortality: spring mortality occurred mainly in Africa in association with the crossing of the Sahara desert, while most mortality during autumn took place in Europe. 4. Our results strongly suggest that events during the migration seasons have an important impact on the population dynamics of long-distance migrants. We speculate that mortality during spring migration may account for short-term annual variation in survival and population sizes, while mortality during autumn migration may be more important for long-term population regulation (through density dependent effects).
Data from: Synergistic use of UAV surveys, satellite tracking data and mark-recapture to estimate abundance of elusive species
<p>Estimating population abundance is central to many ecological studies and important in conservation planning. Yet the elusive nature of many species makes estimating their abundance challenging. Abundance estimates of sea turtles, marine birds and seals are usually made when breeding adults are ashore, while life-stages spent at sea, including as juveniles, are often poorly sampled. We used a combination of high-resolution satellite tracking (Fastloc-GPS), Unmanned Aerial Vehicle (UAV) surveys and catch-mark-recapture approaches to assess abundance of immature hawksbills (Eretmochelys imbricata) and green turtles (Chelonia mydas) in a tidal lagoon of the Chagos Archipelago (Indian Ocean). We captured, marked, and released 50 turtles (48 hawksbill and 2 green turtles) prior to UAV surveys and used satellite tracking data from 27 immature turtles (25 hawksbill and 2 green turtles) to refine the estimated numbers of marked turtles available for resighting and those likely to have emigrated from the study area. We estimated a total of 339 turtles in the lagoon with a density between 265 turtles km-2 at high water and 499 turtles km-2 at low water. Of these 84% were hawksbills and 16% were green turtles. These hawksbill densities are the highest reported amongst 17 foraging sites recorded around the world, likely reflecting successful long-term protection of turtles in the Chagos Archipelago. </p>
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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.