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140 results for “Perch”
#3 - Stone Lion perched in its jungle
I actually painted a cool jungle around this lion, but Tiltbrush didn't me upload boath the Lion and the environement. But you can still see it here: https://twitter.com/Azadux/status/936387266812903424 Captured outside the Legion of Honor museuem in San Francisco Source: Objaverse 1.0 / Sketchfab
Figure 2 in Biology of jungle perch, Kuhlia rupestris, identification of threats and knowledge gaps to improve local and global management
Figure 2. – Diet of K. rupestris in northern Queensland (Pusey et al., 2004).
Kuhlia rupestris, juvenile. © E. Vigneux. Source: Keith et al., 1999. in Biology of jungle perch, Kuhlia rupestris, identification of threats and knowledge gaps to improve local and global management
Kuhlia rupestris, juvenile. © E. Vigneux. Source: Keith et al., 1999.
Singing strategies are linked to perch use on foraging territories in heart-nosed bats
<p>These data include the GPS data of 14 VHF telemetry tracked heart-nosed bats (<em>Cardioderma cor</em>) and associated singing behavior collected during the long dry season (May to October) in Tanzania. These data were used to establish that singing occurs on nighttime foraging areas, and that foraging areas are exclusive and repeatedly used, supporting the hypothesis that <em>C. cor</em> maintain individualistic foraging territories with singing. Times and locations of singing are included in the data set and linked to the GPS waypoints of perches individuals used repeatedly during then 4-6 nights of tracking. GPS data is organized by list of separate waypoints and whether they were used for singing. Furthermore, individuals sit in trees and sing for long stretches of time, and thus these durations were subsampled into 2 minute intervals and associated with the perch location to create a dateset of points for Kernal Density Estimates. Times and perch locations for KDE, including associated singing behavior, are also included. Finally, singing duration of each individual is broken down by perch, night, and hour. Of the 14 tracked individuals, 13 are male (one of which stopped singing soon after tracking commenced) and one is a nonsinging female. </p>
Genomics of humic adaptation in Eurasian perch (Perca fluviatilis): SNP genotypes of 32 perch individuals, supplementary figures and tables
<p>Extreme <span>environments are inhospitable to the majority of species, but some organisms are able to survive in such hostile conditions due to evolutionary adaptations. For example, </span><span>m</span><span>odern bony fishes have colonized various aquatic environments, including perpetually dark,</span><span> hypoxic, hypersaline and toxic habitats</span><span>. </span><span>Eurasian perch (</span><em>Perca fluviatilis</em><span>) is among the few fish species of northern latitudes that is able to live in very acidic humic lakes. Such lakes represent almost "nocturnal" environments; they contain high levels of dissolved organic matter, which in addition to creating a challenging visual environment, also affects a large number of other habitat parameters and biotic interactions. To reveal the genomic targets of humic-associated selection, we performed whole-genome sequencing of perch originating from 16 humic and 16 clear-water lakes in northern Europe. We identified over 800,000 SNPs, of which >10,000 were identified as potential candidates under selection (associated with >3,000 genes) using multiple outlier approaches. Our findings suggest that adaptation to the humic environment may involve hundreds of regions scattered across the genome. Putative signals of adaptation were detected in genes and gene families with diverse functions, including organism development and ion transportation. The observed excess of variants under selection in regulatory regions highlights the importance of adaptive evolution via regulatory elements, rather than via protein sequence modification. Our study demonstrates the power of whole-genome analysis to illuminate multifaceted nature of humic adaptation and provides the foundation for further investigation of causal mutations underlying phenotypic traits of ecological and evolutionary importance.</span></p>
Mechanism For Perching On Smooth Surfaces Using Aerial Impacts
<p><strong>For many applications the battery life is the limiting factor for a UAV. Perching on the environment extends the operating time of the drone, which can be useful in applications such as surveillance (temporary security measures) and maintenance, and can provide additional stability for precise manipulation and reparation tasks. However, on smooth surfaces, such as glass or the surface of the blades of a wind-turbine, perching is challenging, as the surface should not be damaged.</strong></p> <p> </p> <p><strong>This video shows an experiment in which a drone perches on a smooth surface. A drone is presented with a manipulator that consists of three beams in a triangle structure, with a vacuum-cup on the end of the middle beam.The drone impacts the environment, which ensures sufficient vacuum in the vacuum-cup and a proper perch. Then the drone can be turned off. After a small period the drone is enabled again and takes off. Note that the procedure is performed by a person using an user-interface, while the drone is controlled with position and orientation controllers. </strong></p> <p><br> <strong>Note that this work is an application based on the knowledge gained from the work “Compliant Aerial Manipulators: Developing the New Generation of Aerial Robotic Workers”. The work has been extended to automate the perch and actively maintain the vacuum-level in the perched state in the work “Autonomous And Sustained Perching On Smooth Surfaces”.</strong></p>
Autonomous And Sustained Perching On Smooth Surfaces
<p><strong>In this video the results are shown of the extended work on aerial perching, which was started in the work “Mechanism For Perching On Smooth Surfaces Using Aerial Impacts”. </strong></p> <p> </p> <p><strong>The experiment in this video shows the capabilities of an automated and self-regulating perching drone. After the user gives the ‘go’ signal, the drone autonomously impacts the surface and slows down the rotors after successfully attaching. The drone measures the pressure in the vacuum-cup using a pressure-sensor. If the vacuum gets below a threshold level, meaning that the vacuum is about to become too low to remain perched, the drone reactivates and actively presses the vacuum-cup to regain the vacuum. A significant force is required to repress the vacuum-cup, which was done using the knowledge gained from the work “Application Of Substantial And Sustained Force To Vertical Surfaces Using A Quadrotor”.</strong></p> <p> </p> <p><strong>Using the approach described above and the integrated sensing capabilities, the drone is capable of safely remaining airborne (mostly perched on a smooth surface) for 45 minutes(!) on a single battery and having the drone turned on only for about 3 minutes.</strong></p>
Flight dataset for perching with soft claw
<p><span>This document shows the dataset of the flight experiments for perching experimentation with a soft claw attached under the robotic bird. In the dataset log files, information on the position, orientation, input signals, and velocities of the robot during the flights were recorded.</span><span> </span></p>
Flight dataset for perching and circular flight experiments
<p><span>This document shows the dataset of the flights experiments for perching repeatability conference paper [1], and circular flights [2]. In the dataset log files, information on the position, orientation, input signals, and velocities of the robot during the flights were recorded.</span></p> <p><span> </span><strong><span>References</span></strong></p> <p><span>[1] Nekoo, S. R., Sanchez-Laulhe, E., Durán, R. G., Hernandez, M., & Ollero, A., “Increasing Repeatability of the Perching on Branch for Flapping-Wing Flying Robot,” 2024 International Conference on Unmanned Aircraft Systems (ICUAS), 2024. (Accepted).</span></p> <p><span>[2] Sanchez-Laulhe, E., Satue, A. C., Nekoo, S. R., & Ollero, A., “Model-Based Approach for Lateral Maneuvers of Bird-Size Ornithopter,” IEEE International Conference on Robotics and Automation, 2024. (Accepted)</span></p>
Fig 4.A in Study of haematology profile & histopathological changes in di-ammonium phosphate induced climbing perch, Anabas testudineus (Bloch.)
Fig 4.A: Photomicrograph of the normal liver of control fish, Anabas testudineus. H. & E., 100X
Data from: Sympatric wren-warblers partition acoustic signal space and song perch height
Animals employing acoustic signals, such as birds, must effectively communicate over both background noise and potentially attenuating objects in the environment. To surmount these obstacles, animals evolve species-specific acoustic signals that do not overlap with sources of interference (such as songs of close relatives), and issue these songs from locations that maximize transmission. In multispecies assemblages of birds, the acoustic resource may thus be interspecifically partitioned along multiple axes, including song perch height and signal space. However, very few such studies have focused on open habitats, where differences in sound transmission patterns and limited availability of song perches may drive competition across multiple axes within signal space. Here, we demonstrate acoustic signal space partitioning in four sympatric species of wren-warbler (Cisticolidae, Prinia), in an Indian dry deciduous scrub-grassland habitat. We found that the breeding songs of the four species partition acoustic signal space, resulting in interspecific community organization. Within each species' signal space, we uncovered different intraspecific patterns in note diversity. Two species partitioned intraspecific signal space into multiple note types, whereas the other two varied note repetition rate to different extents. Finally, we found that the four species also partition song perch heights, thus exhibiting acoustic niche separation along multiple axes. We hypothesize that divergent song perch heights may be driven by competition for higher singing perches or other ecological factors rather than signal propagation. Acoustic signal partitioning along multiple axes may therefore arise from a combination of diverse ecological processes.
Data for: Linking behavioural type with cannibalism in Eurasian perch
<p>Behavioural data and prey selection data</p> <p>V3 includes corrected Fulton's K and date of behavioural trials </p>
Data for: The relationships of breeding stage to daytime singing behaviour and song perch height in Bermuda White-eyed Vireos (Vireo griseus bermudianus)
<p><span>Bird song is crucial for attracting mates and defending territories, but different types of song or different singing behaviours may be involved in acquiring or maintaining each resource. Furthermore, male songbirds may adjust when and where they sing throughout the breeding season, depending on their breeding stage. However, such relationships remain untested in several avian taxa. Here, we studied male Bermuda White-eyed Vireos (<em>Vireo griseus bermudianus</em>), a passerine with two distinct song types (discrete and rambling), to test the mate attraction and territory defence hypotheses. We compare song production and song perch height among different stages of the breeding season and during the non-breeding season. We show that male vireos produce both song types during the breeding and non-breeding seasons, suggesting dual roles in mate choice and territorial defence. Song production did not differ significantly between the breeding and non-breeding seasons, but, within the breeding season, males without nesting duties sang significantly more songs than males with nesting duties. Song perch height was higher during the breeding season versus non-breeding season, among males without nesting duties compared to males with nesting duties, and when males produced discrete versus rambling songs. Our findings suggest that male vireos increase their conspicuousness to prospecting females by increasing song production and song perch height, and that they sing during the breeding and non-breeding seasons to defend year-round territories. Collectively, our study supports the mate attraction and territory defence hypotheses of bird song.</span></p>
Data for: The relationships of breeding stage to daytime singing behaviour and song perch height in Bermuda White-eyed Vireos (Vireo griseus bermudianus)
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Data from: Sympatric wren-warblers partition acoustic signal space and song perch height
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Data from: Elevated temperature during rearing diminishes swimming and disturbs the metabolism of yellow perch larvae
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Data from: Intra-population variation in reproductive timing co-varies with thermal plasticity of offspring performance in perch (Perca fluviatilis)
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Perch choice and substrate matching to the dorsal patterns of Amphibolurus muricatus lizards
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Genomics of humic adaptation in Eurasian perch (Perca fluviatilis): SNP genotypes of 32 perch individuals, supplementary figures and tables
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Data from: Multiple routes to interspecific territoriality in sister species of North American perching birds
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