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79 results for “Anti-predator”
Simulation Dataset: Collective anti-predator escape manoeuvres through optimal attack and avoidance strategies
<p>This is a supplementary simulation dataset to reproduce Fig. 3C,D of the manuscript "Collective anti-predator escape manoeuvres through optimal attack and avoidance strategies" by Bartashevich et al.</p> <p>The zip folder contains the following 3 files in h5 format: front attack (out_Npred1_pred_angle0.0.h5), side attack (<span>out_Npred1_pred_angle1.5707963267948966.h5), </span><span>back attack (out_Npred1_pred_angle3.141592653589793.h5).</span></p> <p>Each file has the following "keys": KeysViewHDF5 ['circ_seg', 'end', 'endD', 'end_PosVel', 'fount', 'part', 'partD', 'pavas', 'pred', 'predD', 'start', 'start_fountain', 'start_pred', 'swarm', 'swarm_pred0', 'swarm_predD'].</p> <p>The key necessary to reproduce Fig. 3C,D of the aforementioned paper is "fount" (<HDF5 dataset "fount": shape (40, 1200, 100, 8), type "<f8">). Namely, "fount" data array consists of 40 simulation runs, 1200 time points, 100 agents, and 8 metrics. The metric with index "0" depicts the value of the Euclidean distance from the agent <em>i</em> to the simulated predator. The metric with index "1" depicts the value of the position angle (theta 1 in rad) of the agent <em>i</em> relative to the simulated predator. The metric with index "2" depicts the value of the flee angle (theta 2 in rad) of the agent <em>i</em> relative to the simulated predator.</p> <p>To estimate the start and the end of the fountain evasion, one can use the following script in Python:</p> <p>import numpy as np</p> <p>m = h5py.File(filename, "r")<br><br>for key in m.keys():<br> print(key)</p> <p>fount_runs = m[key]["fount"]</p> <p>for j in range(40):<br> fnt_start[j] = np.where(fount_runs[j, 0:1200, 0:100,5]==1)[0][0] <br> fnt_end[j] = np.where(fount_runs[j, 0:1200, 0:100,5]==1)[0][-1]</p>
Empirical Dataset: Collective anti-predator escape manoeuvres through optimal attack and avoidance strategies
<h3>Description of the data and file structure</h3> <p>The files contain the source data for Fig. 1 and Fig. 3A,B of the manuscript "Collective anti-predator escape manoeuvres through optimal attack and avoidance strategies" by Bartashevich et al.</p> <h4>Files and variables</h4> <h5>File: Fountain_Fish_coordinates.zip</h5> <p><strong>Description:</strong> </p> <p>The zip file contains 30 folders, each containing information on one predator attack and respective prey evasion. Each folder is named according to the drone ID used for the filming (e.g., DJI _1, DJI _2, DJI _3) and the respective frame number (e.g., f930) from the video recording. </p> <h5>File naming</h5> <p>Each folder contains JPG and CSV files. </p> <p>The JPG files show the image from the footage at the corresponding frame indicated in the files' name (e.g., frame_001_im).</p> <p>There are 2 types of CSV files. Files with the name 'polygon.csv' contain coordinates (in pixels) of points (x, y) defining the polygon outlining the prey school at the particular frame as indicated in the files' name (e.g., frame001) and corresponding to the image in the JPG file with the same frame number. Files with the name 'sardines_and_marlin.csv' contain coordinates (in pixels) of points (x, y), defining the head (columns 1 and 2) and the dorsal fin (columns 3 and 4) of single sardine individuals (by rows), and of the respective attacking marlin: marlin's head (columns 5 and 6), marlin's dorsal fin (columns 7 and 8), and marlin's tip of the bill (columns 9 and 10). These coordinates correspond to the respective image with the same frame number.</p>
Snake-like bird hisses induce anti-predator responses in a frog
<p>Mimicry is a fascinating natural phenomenon, yet the ecological role of vocal mimicry receives limited attention. Some snakes emit hissing calls and many birds perform such acoustic mimicry in order to deter potential predators. Here we hypothesize that snake-like hisses may evoke anti-predator responses in anuran species. We conducted sound playbacks to test how little torrent frogs (<em>Amolops</em> <em>torrentis</em>) varied their behaviors in response to white noise, snake hisses, and snake-like bird hisses. We found that snake hiss from sympatric king cobras (<em>Ophiophagus</em> <em>hannah</em>) could change calling behavior of little torrent frogs, while white noise and snake hiss from allopatric Gaboon vipers (<em>Bitis</em> <em>gabonica</em>) showed no influence. Calling frogs also had no response to white noise and great tit (<em>Parus</em> <em>major</em>) hisses, which had low acoustic similarity with snakes, while they decreased calling activity when exposed to zitting cisticola (<em>Cisticola</em> <em>juncidis</em>) hisses which had high acoustic similarity with snakes. In addition, more individuals cease calling during the playback of zitting cisticola hisses. These results suggest that both snake and snake-like hiss calls may evoke anti-predator responses in frog species. To our knowledge, this is the first study that attempts to reveal the effect of snake calls and avian vocal mimicry on anurans.</p>
Data from: Startling ravens (Corvus corax) at foraging: differences in anti-predator behaviour can be explained by age rather than personality
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Navigating the landscape of fear: Fruit flies exhibit distinct anti-predator and anti-parasite defensive behaviours
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Dataset for: Sensory environment affects Icelandic threespine stickleback's anti-predator escape behaviour
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Data from: Anti-predator defenses are linked with high levels of genetic differentiation in frogs
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Data from: From forest to city: Urbanization modulates relative abundance of anti-predator coloration
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Seasonal changes in mixed-species bird flocks and anti-predator information
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Data for fish foraging and anti-predator escape behavior
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Data from: Synchronising anti-predator behaviour in the red flour beetle Tribolium castaneum
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Data from: Infection reduces anti-predator behaviors in house finches
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Cheating death: Selection on digestive physiology overcomes expected growth costs of anti-predator defenses
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Nightly selection of resting sites and group behavior reveal anti-predator strategies in giraffe
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Data for: Snake-like bird hisses induce anti-predator responses in a frog
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Recovery of reef shark populations invokes anti-predator behaviours in mesopredatory reef fishes on a coral reef
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Anti-predator behaviour depends on male weapon size
<p>Tonic immobility and escape are adaptive anti-predator tactics used by many animals. Escape requires movement, whereas tonic immobility does not. If anti-predator tactics relate to weapon size, males with larger weapons may adopt tonic immobility, whereas males with smaller weapons may adopt escape. However, no study has investigated the relationship between weapon size and anti-predator tactics. In this study, we investigated the relationship between male weapon size and tonic immobility in the beetle <i>Gnathocerus</i><i> cornutus</i>. The results showed that tonic immobility was more frequent in males with larger weapons. Although most studies of tonic immobility in beetles have focused on the duration, rather than the frequency, tonic immobility duration was not affected by weapon size in <i>G</i>.<i> cornutus</i>. Therefore, this study is the first to suggest that the male weapon trait affects anti-predator tactics.</p>
Data from: A molecular phylogeny of Eumorpha (Lepidoptera: Sphingidae) and the evolution of anti-predator larval eyespots
Many insects possess conspicuous external circular ring markings that resemble the eye of a vertebrate. These 'eyespots' typically function to startle or otherwise deter predators, but few studies have examined how eyespots have evolved. We study the evolution of the posterior larval eyespot in the charismatic New World hawkmoth genus Eumorpha. While Eumorpha has a range of posterior larval eyespot shapes and sizes, little is known of how this trait has evolved because phylogenetic relationships of Eumorpha remain largely unknown. In this study, we included 62 individuals from 23 of 26 described Eumorpha species, and sequenced four genes (CAD, EF-1α, Wingless and COI), totaling 3773 base pairs. Maximum likelihood and Bayesian phylogenetic methods produced largely congruent trees with well-supported relationships. Our analyses reveal that Eumorpha probably had an ancestor with a posterior larval eyespot and that the eyespot was subsequently lost in at least three lineages. Eumorpha appears to have originated in Central and South America and expanded its distribution to North America.
Data from: Benefits of coloniality: communal defence saves anti-predator effort in cooperative breeders
1. Many anti-predator benefits of group living are predicted to scale with prey density. Nevertheless, evidence for a general density-dependent increase of prey survival is scarce. A possible reason for this discrepancy is the reduction of costly anti-predator behaviour of prey with increasing density, which may offset density-dependent survival gains. Benefits of group living might hence accrue by saved investment into anti-predator behaviours rather than by increased survival rates. 2. Here, we experimentally presented predators in a colony of the cooperatively breeding cichlid fish Neolamprologus pulcher to study density dependence of their anti-predator defences. Predation is a driver of the formation and stability of breeding groups in this species, but potential benefits of coloniality are yet unclear. We hypothesised that increased density of breeding groups would either increase total anti-predator behaviour or allow individuals to reduce their anti-predator effort due to enhanced predator deterrence from neighbours. 3. Confirming predictions from the second hypothesis, our results show that focal groups invested less into anti-predator behaviour at higher densities, while neighbouring groups' behaviour compensated for this reduced effort. This resulted in stable levels of anti-predator behaviours over the entire range of natural densities. Thus, aggregating in colonies allows these fish to save investment in anti-predator behaviour. 4. These results suggest that the formation of both breeding groups and colonies reflects adaptive responses to high predation pressure in this species. Two different levels of sociality seem to be favoured by the same selective force. 5. Our study provides experimental evidence in nature for an important benefit of coloniality that may explain the concomitant existence of different levels of sociality in many highly social taxa.
Data from: The anti-predator role of within-nest emergence synchrony in sea turtle hatchlings
Group formation is a common behaviour among prey species. In egg-laying animals, despite the various factors that promote intra-clutch variation leading to asynchronous hatching and emergence from nests, synchronous hatching and emergence occurs in many taxa. This synchrony may be adaptive by reducing predation risk, but few data are available in any natural system, even for iconic examples of the anti-predator function of group formation. Here, we show for the first time that increased group size (number of hatchlings emerging together from a nest) reduces green turtle (Chelonia mydas) hatchling predation. This effect was only observed earlier in the night when predation pressure was greatest, indicated by the greatest predator abundance and a small proportion of predators preoccupied with consuming captured prey. Further analysis revealed that the effect of time of day was due to the number of hatchlings already killed in an evening; this, along with the apparent lack of other anti-predatory mechanisms for grouping, suggests that synchronous emergence from a nest appears to swamp predators, resulting in an attack abatement effect. Using a system with relatively pristine conditions for turtle hatchlings and their predators provides a more realistic environmental context within which intra-nest synchronous emergence has evolved.
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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
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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.