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76 results for “Aggressive behavior”
Figures 1a–1f in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 1a–1f. Developing from the initial stage to the confronting stage. Figure 1a. Initial stage, showing a defensive posture (left, A1, right, A2). Figure 1b. Initial stage, tentative pinching when mutually touched (left, A1, right, A2). Figure 1c. Initial stage, showing a shielding posture (left, B1, right, B2). Figure 1d. Initial stage, one trying to suppress the other (left, B1, right, B2). Figure 1e. Initial stage, shielding collision (left, B1, right, B2). Figure 1f. Spanning pedipalps, developing into confronting stage (left, A1, right, A2).
Figure 5 in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figure 5. Duration of each round and that of arm-span competition occurred in each round (in seconds).
Figures 9a–9f in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 9a–9f. Examples of physical combat in genus Hottentotta Birula, 1908. Figures 9a–9c. Adult males of H. minusalta Vachon, 1959. Figure 9d. An adult pair of H. jayakari (Pocock, 1895). Figure 9e. An adult pair of H. franzwerneri (Birula, 1914). Figure 9f. An adult pair of H. buchariensis (Birula, 1897).
Figures 10a–10c in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 10a–10c. Examples of three types of behavior observed among several species of Heterometrinae. Figure 10a. Arm-span competition (Chersonesometrus tristis). Figure 10b. Shielding response (strictly defined as an easily triggered response; Heterometrus species do exhibit similar posture but happens only when their pedipalps are suppressed; Srilankametrus yaleensis). Figure 10c. Aggressive response (here shows a pre-posture before "pinching" or "punching"; Heterometrus spinifer).
Figures 7a–7d in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 7a–7d. Examples of physical combat in other scorpions. Figure 7a. Adult females of Androctonus gonneti Vachon, 1948 aiming at each other with their metasoma (the accompanied juddering behavior cannot be illustrated by the figure). Figure 7b. A pair of adult A. gonneti, the female is controlling the telson of the male. Figures 7c–7d. Adults of Hottentotta salei (Vachon, 1980) controlling the telson of the opponent: female and male (c), and two males (d).
Figures 3a–3b in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 3a–3b. Comparison of aggression between arm-span competition and stinging fighting behavior. Figure 3a. No fighting occurred after one was pulled over (left, A1, right, C). Figure 3b. Violent fighting occurred at the initial stage when both individuals were infuriated (left, A1, right, B1).
Figures 8a–8f in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 8a–8f. Examples of physical combat in other scorpions. Figures 8a–8c. Juveniles of Hadrurus arizonensis Ewing, 1928, performing the typical deterrent posture. Figures 8d–8f. Leiurus spp., performing the intimidation behavior: adult males of Leiurus jordanensis Lourenço et al., 2002 and L. haenggii Lowe et al., 2014 (d), adult males of L. jordanensis and L. quinquestriatus (Ehrenberg, 1828) (e), and an adult pair of L. jordanensis (f; male on the left).
Figures 6a–6d in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 6a–6d. Examples of similar behavior observed between two adult males in other Heterometrinae species. Figure 6a. Heterometrus minotaurus (above) and Heterometrus thorellii (below) (photo: V. Tang). Figure 6b. Chersonesometrus tristis (photo: V. Tang). Figure 6c. H. thorellii (photo: Gentia). Figure 6d. H. thorellii (below) and Heterometrus longimanus (above) (photo: Gentia).
Figures 2a–2f. Confronting stage. Figure 2a in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figures 2a–2f. Confronting stage. Figure 2a. Spreading the pedipalps, lateral view (left, A2, right, A1). Figure 2b. Spreading the pedipalps, posterior view (distal, A1, proximal, C). Figure 2c. Metasoma of the two males entangling with each other (left, C, right, A1). Figure 2d. One being lifted up by the "metasomal hook" (left, C, right, A1). Figure 2e. Lifting, lateral view (left, A1, right, C). Figure 2f. Lifting, posterior view (proximal, A1, distal, C).
Fig. 1 in Oxidative stress biomarkers and aggressive behavior in fish exposed to aquatic cadmium contamination
Fig. 1. Effects of cadmium exposure on aggressiveness parameters of Nile tilapia. Values are means (± SD). * = Statistically different from control.
Figure 11 in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figure 11. Dinorhax rostrumpsittaci (Simon, 1877), two males in threatening condition.
Figure 4 in Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions
Figure 4. Escaping stage (right male (A2) fled).
Cross-context behavioral correlations and signals of aggression in females of a livebearing fish
<p>Behaviors may be adaptively correlated with each other and with other aspects of phenotype. We investigated behavior across foraging, mating, and risk contexts in females of the poeciliid fish, <em>Girardinus metallicus</em>. We quantified relationships between these behaviors and aggression signals, body size, and reproductive output. Behaviors describing aggression and boldness, some of which were repeatable, were correlated in females. Aggression was signaled by the darkening of a black spot on the extended dorsal fin or by fin flaring. Spot darkening occurred during intra- and intersexual interactions and was positively correlated with inter-female aggression and negatively correlated with time females spent following males, suggesting that it honestly indicates motivational state. In contrast, fin flaring was only directed at females and occurred more frequently in the foraging context. Larger females had fewer offspring and received fewer courtship displays, possibly because they were more aggressive to males. In contrast to studies of males, we found a negative relationship between rank order of boldness and aggression, consistent with either a tradeoff or with selection favoring the negative relationship. Our results highlight the importance of studying females in model systems to uncover novel patterns and potentially meaningful departures from what is typically seen in males.</p>
Beyond sex and aggression: Testosterone rapidly matches behavioral responses to social context and tries to predict the future
<p>Although androgens are widely studied in the context of aggression, androgenic influences on prosocial behaviors have been less explored. We examined testosterone's (T) influence on prosocial and aggressive responses in a positively-valenced social context (interacting with a pairbond partner) and a negatively-valenced context (interacting with an intruder) in socially monogamous Mongolian gerbils. T increased and decreased prosocial responses in the same individuals towards a pairbond partner and an intruder, respectively, both within 30 minutes, but did not affect aggression. T also had persistent effects on prosocial behavior; males in which T initially increased prosocial responses towards a partner continued to exhibit elevated prosocial responses towards an intruder male days later until a second T injection rapidly eliminated those responses. Thus, T surges can rapidly match behavior to current social context, as well as prime animals for positive social interactions in the future. Neuroanatomically, T rapidly increased hypothalamic oxytocin, but not vasopressin, cellular responses during interactions with a partner. Together, our results indicate that T can facilitate and inhibit prosocial behaviors depending on social context, that it can influence prosocial responses across rapid and prolonged time scales, and that it affects oxytocin signaling mechanisms that could mediate its context-dependent behavioral influences.</p>
The Effect of Prefrontal Cortex Stimulation on Antisocial and Aggressive Behavior
ClinicalTrials.gov study NCT02427672. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Efficacy of Aripiprazole Versus Placebo in the Reduction of Aggressive and Aberrant Behavior in Autistic Children
ClinicalTrials.gov study NCT00468130. IPD Sharing: NO. Countries: 1. Publications: 1.
Beyond sex and aggression: Testosterone rapidly matches behavioral responses to social context and tries to predict the future
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Data from: Recent biological invasion shapes species recognition and aggressive behavior in a native species: a behavioral experiment using robots in the field
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Data from: Experimental transplants demonstrate shifts in predation favor evolution of aggressive behaviors in Trinidadian killifish
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Data from: Exploratory behavior, but not aggressiveness, is correlated with breeding dispersal propensity in the highly philopatric Thorn-tailed Rayadito
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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.