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148 results for “pigeon”
Ground-truthing of satellite imagery to track harmful algal blooms in Pigeon Lake, Alberta, Canada 2017-2022
This data was collected to create a calibrated model that would enable the use of satellite imagery to track harmful algal blooms by using chlorophyll a estimates as a proxy for cyanobacteria in the lake. Samples from Pigeon Lake were collected on the same day that the Sentinel-2 satellite would pass over the lake. These samples were analyzed for different algal pigments and enumerated to genus level to ensure that the satellite imagery was of cyanobacteria rather than different algal groups. An algorithm was developed which we termed the three band index (TBI) that best matched with the cholorophyll a from the in situ samples. This model was used on satellite imagery from 2017-2022 of Pigeon Lake to get chlorophyll a estimates for every 20 x 20 pixel of each image of the lake. This pixel data was used to determine different bloom metrics like the intensity, the area (extent) and severity.
Fine-scale changes in speed and altitude suggest protean movements in homing pigeon flights
<p>The power curve provides a basis for predicting adjustments that animals make in flight speed, for example in relation to wind, distance, habitat foraging quality and objective. However, relatively few studies have examined how animals respond to the landscape below them, which could affect speed and power allocation through modifications in climb rate and perceived predation risk. We equipped homing pigeons (<i>Columba livia</i>) with high-frequency loggers to examine how flight speed, and hence effort, varies in relation to topography and land cover. Pigeons showed mixed evidence for an energy-saving strategy, as they minimized climb rates by starting their ascent ahead of hills, but selected rapid speeds in their ascents. Birds did not modify their speed substantially in relation to land cover, but used higher speeds during descending flight, highlighting the importance of considering the rate of change in altitude before estimating power use from speed. Finally, we document an unexpected variability in speed and altitude over fine scales; a source of substantial energetic inefficiency. We suggest this may be a form of protean behaviour adopted to reduce predation risk when flocking is not an option, and that such a strategy could be widespread.</p>
Data from: Emergence of splits and collective turns in pigeon flocks under predation
Complex patterns of collective behaviour may emerge through self-organization, from local interactions among individuals in a group. To understand what behavioural rules underlie these patterns, computational models are often necessary. These rules have not yet been systematically studied for bird flocks under predation. Here, we study airborne flocks of homing pigeons attacked by a robotic-falcon, combining empirical data with a species-specific computational model of collective escape. By analysing GPS trajectories of flocking individuals, we identify two new patterns of collective escape: early splits and collective turns, occurring even at large distances from the predator. To examine their formation, we extend an agent-based model of pigeons with a 'discrete' escape manoeuvre by a single initiator, namely a sudden turn interrupting the continuous coordinated motion of the group. Both splits and collective turns emerge from this rule. Their relative frequency depends on the angular velocity and position of the initiator in the flock: sharp turns by individuals at the periphery lead to more splits than collective turns. We confirm this association in the empirical data. Our study highlights the importance of discrete and uncoordinated manoeuvres in the collective escape of bird flocks and advocates the systematic study of their patterns across species.
Fig. 1 in Bird Lice (Mallophaga, Philopteridae, Menoponidae) Of Domestic Pigeons On Specialized Pigeon Breeding Farms In Poltava
Fig. 1. Fam. Philopteridae: а — Columbicola columbae — general view; b — Companulotes compare — head;
Fig. 3 in Bird Lice (Mallophaga, Philopteridae, Menoponidae) Of Domestic Pigeons On Specialized Pigeon Breeding Farms In Poltava
Fig. 3. Fam. Menoponidae: a — Bonomiella columbae — general view; b — Hohorstiella lata— general view.
Рис. 1. Яйцо скаΛьного гоΛубя (Columba rupestris), вероятно, раскΛёванное сорокой (Pica pica) и обнаруженное в окрестностях c. НовоникоΛьск (Уссурийский гороΔской округ). 12.01.2019. Фото Ю. Н. ГΛущенко in Winter Nesting Of The Rock Pigeon In Primorsky Krai
Рис. 1. Яйцо скаΛьного гоΛубя (Columba rupestris), вероятно, раскΛёванное сорокой (Pica pica) и обнаруженное в окрестностях c. НовоникоΛьск (Уссурийский гороΔской округ). 12.01.2019. Фото Ю. Н. ГΛущенко
Fig. 2 in Winter Nesting Of The Rock Pigeon In Primorsky Krai
Fig. 2. Nest with Hill Pigeon (Columba rupestris) clutch. Vicinity of the village Novonikolsk (Ussuriysk urban district). 01.14.2019. Photo D. V. Korobov
Рис. 2. ГнезΔо с кΛаΔкой скаΛьного гоΛубя (Columba rupestris). Окрестности с. НовоникоΛьск (Уссурийский гороΔской округ). 14.01.2019. Фото Α. В. Коробова in Winter Nesting Of The Rock Pigeon In Primorsky Krai
Рис. 2. ГнезΔо с кΛаΔкой скаΛьного гоΛубя (Columba rupestris). Окрестности с. НовоникоΛьск (Уссурийский гороΔской округ). 14.01.2019. Фото Α. В. Коробова
Fig. 1 in Winter Nesting Of The Rock Pigeon In Primorsky Krai
Fig. 1. Hill Pigeon egg (Columba rupestris), probably spelled forty (Pica pica) and found in the vicinity of the village Novonikolsk (Ussuriysk urban district). 12.01.2019. Photo by Yu. N. Glushchenko
Figure 4 in Third time lucky for Forsten's pigeon; taeniura, forsterii, forsteni
Figure 4. Colombe de Forster Columba Forsterii Temminck, 1842, in Les pigeons (Knip & Prévost 1838–43, pl. 47); copy held in the Rothschild Library, NHMUK, Tring (Hein van Grouw, © Trustees of the Natural History Museum, London)
Figure 2 in Third time lucky for Forsten's pigeon; taeniura, forsterii, forsteni
Figure 2. Specimen (NHMUK 1844.5.1.7) of White-bellied Imperial Pigeon Ducula forsteni (Bonaparte, 1854), purchased by the British Museum from Leadbeater in 1844; it was without doubt collected by Forsten and therefore a fourth syntype (Jonathan Jackson, © Trustees of the Natural History Museum, London)
Figure 3 in Third time lucky for Forsten's pigeon; taeniura, forsterii, forsteni
Figure 3. Male (right) and female (left) specimens of White-bellied Imperial Pigeon Ducula forsteni (Bonaparte, 1854), collected by Wallace in 1859 at Tondano, North Sulawesi, in the Natural History Museum, Tring (NHMUK 1860.9.6.4 and NHMUK 1873.5.12.2142, respectively) (Jonathan Jackson, © Trustees of the Natural History Museum, London)
Figure 1 in Third time lucky for Forsten's pigeon; taeniura, forsterii, forsteni
Figure 1. Adult male White-bellied Imperial Pigeon Ducula forsteni (Bonaparte, 1854), collected by Forsten in North Sulawesi, in the Naturalis Biodiversity Center, Leiden, RMNH.AVES.216523; this specimen, together with two others in Leiden, RMNH.AVES.216524 (female) and RMNH. AVES.216525 (male), are syntypes of the name Forsterii, and therefore also of the name forsteni (© Naturalis Biodiversity Center, Leiden)
Figures 5‒6 in Novel ecological information for Silvery Pigeon Columba argentina, with first description of the chick
Figures 5‒6. Fig fruits Ficus sp., a food resource of Silvery Pigeon Columba argentina, Linggam Island, Aceh province, Sumatra, 8 July 2021 (Muhammad Iqbal)
Figure 1 in Novel ecological information for Silvery Pigeon Columba argentina, with first description of the chick
Figure 1. Silvery Pigeon Columba argentina chick, collected on Tepi Island, Aceh province, Sumatra, 3 July 2021 (Muhammad Iqbal)
Figure 4 in Novel ecological information for Silvery Pigeon Columba argentina, with first description of the chick
Figure 4. Coconut frond where the Silvery Pigeon Columba argentina chick in Fig. 1 was reportedly found, Tepi Island, Aceh province, Sumatra, 4 July 2021 (Muhammad Iqbal)
Figure 3 in Novel ecological information for Silvery Pigeon Columba argentina, with first description of the chick
Figure 3. Adult Silvery Pigeon Columba argentina, Tepi Island, Aceh province, Sumatra, 4 July 2021 (Muhammad Iqbal)
Figure 7‒8. Chinese Bayan fruit Ficus microcarpa, reportedly a in Novel ecological information for Silvery Pigeon Columba argentina, with first description of the chick
Figure 7‒8. Chinese Bayan fruit Ficus microcarpa, reportedly a major food resource of Silvery Pigeon Columba argentina, Bulu Hadik, Teluk Dalam subdistrict, Aceh province, Sumatra, 10 July 2021 (Muhammad Iqbal)
Fig. 5 in Trichomonas stableri n. sp., an agent of trichomonosis in Pacific Coast band-tailed pigeons (Patagioenas fasciata monilis)
Fig. 5. Pathogenesis of T. stableri in Pacific Coast band-tailed pigeons. Oral and esophageal caseonecrotic lesions (e.g., white arrowheads) observed during post-mortem examination in cases CA015500 (A) and CA015499 (B). Both birds were collected and sampled between February 16 and February 19, 2012 during a trichomonosis mortality event in Monterey County, California. Infection with T. stableri was confirmed by DNA amplification performed directly on lesion tissues. (C) Immunohistochemical staining of trichomonad antigen (red) in lung tissue of case CA015506. Lung infection likely occurred via aspiration of necrotic debris from the laryngeal region. Scale bar is 50 µm. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 6 in Trichomonas stableri n. sp., an agent of trichomonosis in Pacific Coast band-tailed pigeons (Patagioenas fasciata monilis)
Fig. 6. Geographic distribution of birds (solid black circles) infected with T. stableri in California. Circle size is relative to the number of birds infected at each site.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.