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9 results for “Bird marking”
Data and code from: A large-scale experiment demonstrates line marking reduces power line collision mortality for large terrestrial birds, but not bustards, in the Karoo, South Africa
<p>Line markers are widely used to mitigate bird collisions with power lines, but few studies have robustly tested their efficacy. Power line collisions are an escalating problem for several threatened bird species endemic to southern Africa, so it is critical to know whether or not marking works to adequately manage this problem. Over 8 years, a large-scale experiment was set up on 72 of 117 km of monitored transmission power lines in the eastern Karoo, South Africa, to assess whether line markers reduce bird collision mortality, particularly for Blue Cranes <i>Grus paradisea</i> and Ludwig's Bustards <i>Neotis ludwigii</i>. We tested the two marking devices commonly used in South Africa: bird flappers and static bird flight diverters. Using a before-after-control-impact design, we show that line marking reduced collision rates for Blue Cranes by 92% (95% CI 77-97%) and all large birds by 51% (95% CI 23-68%), but had no effect on bustards. Both marker types appeared similarly effective. Given that monitoring at this site also confirmed high levels of mortality of a range of species of conservation concern, we recommend that marking be widely installed on new power lines. However, other options need to be explored urgently to reduce collision mortality of bustards. Five bustard species were in the top ten list of most frequently found carcasses, and high collision rates of Ludwig's Bustards (0.68 birds·km<sup>-1</sup>·year<sup>-1</sup> uncorrected for survey biases) add to wider concerns about population level effects for this range-restricted and Endangered species. </p> <p>This dataset includes the data and R code for this journal paper.</p>
FIGURE 2 in Does The Reproductive Season Account For More Records Of Birds In A Marked Seasonal Climate Landscape In The State Of São Paulo, Brazil?
FIGURE 2: Boxplot (a) and hierarchical cluster analysis (b) of monthly rainfall values collected in Bauru, state of São Paulo, southeastern Brazil, from January 2004-December 2010.
FIGURE 1 in Does The Reproductive Season Account For More Records Of Birds In A Marked Seasonal Climate Landscape In The State Of São Paulo, Brazil?
FIGURE 1: Location (white circle) where bird surveys were carried out in the municipality of Bauru (black arrow), state of São Paulo, southeastern Brazil. Shades of gray represent the original Cerrado vegetation cover (light hue) and the Atlantic forest (intermediate hue); dark gray hues indicate the present-day distribution of Cerrado remnant vegetation.
FIGURE 4 in Does The Reproductive Season Account For More Records Of Birds In A Marked Seasonal Climate Landscape In The State Of São Paulo, Brazil?
FIGURE 4: Differences in the numbers of species (a) and individuals (b) recorded during breeding and nonbreeding seasons at the Jardim Botânico (triangles) and at the UNESP campus (squares), Bauru, state of São Paulo, southeastern Brazil, from September 2005-November 2006. Error bars represent SE.
Supplemental data from: Intraspecific facial bite marks in tyrannosaurids provide insight into sexual maturity and evolution of bird-like intersexual display
<p>Intraspecific aggression, or agonism, is a widespread intrasexual selective behavior important to understanding animal behavioral ecology and reproductive systems. Such behavior can be studied either by direct observation or inferred from wound/scar frequency in extant species, but is difficult to document in extinct taxa, limiting understanding of its evolution. Among extant archosaurs, crocodylians display extensive intrasexual aggression, whereas birds show extreme visual/vocal intersexual display. The evolutionary origin of this behavioral divergence, and pattern in non-avian dinosaurs, is unknown. Here we document the morphology, frequency, and ontogeny of intraspecific facial bite lesions (324 lesions) in a large sample of tyrannosaurids (202 specimens, 528 elements) to infer patterns of intraspecific aggression in non-avian theropods. Facial scars are consistent in position and orientation across tyrannosaurid species, suggesting bites were inflicted due to repeated/postured behavior. Facial scars are absent in young tyrannosaurids, first appear in immature animals (~50% adult skull length), are present in ~60% of the adult-sized specimens, and show aggressor:victim size isometry. The ontogenetic distribution of bite scars suggests agonistic behavior is associated with the onset of sexual maturity, and scar presence in approximately half the specimens may relate to a sexual pattern. Considered in a phylogenetic context, intraspecific bite marks are consistent and widely distributed in fossil and extant crocodyliforms and non-maniraptoriform theropods, suggesting a potential plesiomorphic behavior in archosaurs. Their absence in maniraptoriform theropods, including birds, may reflect a transition from boney cranial ornamentation and crocodylian-like intrasexual aggression to avian-like intersexual display with the evolution of pennaceous feathers.</p>
Data from: Marked host specificity and lack of phylogeographic population structure of Campylobacter jejuni in wild birds
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Data and code from: A large-scale experiment demonstrates line marking reduces power line collision mortality for large terrestrial birds, but not bustards, in the Karoo, South Africa
Open the record for dataset details and reuse information.
Supplemental data from: Intraspecific facial bite marks in tyrannosaurids provide insight into sexual maturity and evolution of bird-like intersexual display
Open the record for dataset details and reuse information.
FIGURE 3 in Does The Reproductive Season Account For More Records Of Birds In A Marked Seasonal Climate Landscape In The State Of São Paulo, Brazil?
FIGURE 3: Species accumulation curves of the observed number of species according to breeding (solid lines) and nonbreeding seasons (dotted lines) at the Jardim Botânico (a) and at the UNESP campus (b), Bauru, state of São Paulo, southeastern Brazil, from September 2005-November 2006.
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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.