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1,294 results for “aggressiveness”
Fig. 2 in Wolf in a sheep's clothes: juvenile coney (Cephalopholis fulva) as an aggressive mimic of the brown chromis (Chromis multilineata)
Fig. 2. Juvenile coney (above) and brown chromis (below) in dorsal view showing pale yellow spots on dorsum.
Fig. 1. A in Wolf in a sheep's clothes: juvenile coney (Cephalopholis fulva) as an aggressive mimic of the brown chromis (Chromis multilineata)
Fig. 1. A juvenile coney (Cephalopholis fulva) (circle) joins a school of brown chromis (Chromis multilineata) that is nearing a rocky reef at Fernando de Noronha Archipelago, off Northeast Brazil (above). A juvenile coney (left) and a similarly sized brown chromis (right) photographed alone.
Data for: Aggressive hosts are undeterred by a cuckoo's hawk mimicry, but probably make good foster parents
<p>Parasites face a trade-off if the highest quality hosts are also most resistant to exploitation. For brood parasites, well-defended host nests may be both harder to parasitize and harder to predate, leading to better survival of parasitic chicks. This trade-off could be accentuated if brood-parasitic adaptations to reduce front-line defences of hosts, such as mimicry of hawks by Cuculus cuckoos, do not deter hosts which aggressively mob raptors. Here we investigate the costs and benefits to the African cuckoo (Cuculus gularis) of specializing on a highly aggressive host species, the fork-tailed drongo (Dicrurus adsimilis). Field experiments showed that drongos strongly attacked and mobbed both cuckoo and hawk models, implying that hawk mimicry does not deter front-line defences against African cuckoos. Attacks on cuckoo and hawk models generally declined after the egg stage but attacks on snake models sharply increased, suggesting drongos may treat hawks more like cuckoos than predators. We suggest that the cost to cuckoos of parasitizing an aggressive host may be alleviated by subsequent benefits to their offspring, since drongo nests survived better than nests of other species with similar nesting ecology. These results are indicative of a trade-off between host quality and susceptibility for a brood parasite.</p>
Aggression and spatial positioning of kin and non-kin fish in social groups
<p>Group-living animals are faced with the challenge of sharing space and local resources amongst group members who may be either relatives or non-relatives. Individuals may reduce the inclusive fitness costs they incur from competing with relatives by either reducing their levels of aggression towards kin or by maintaining physical separation between kin. In this field study, we used the group-living cichlid <em>Neolamprologus</em> <em>multifasciatus</em> to examine whether within-group aggression is reduced among group members that are kin and whether kin occupy different regions of their group's territory to reduce kin competition over space and local resources. We determined the kinship relationships among cohabiting adults via microsatellite genotyping and then combined these with spatial and behavioural analyses of groups in the wild. We found that aggressive contests between group members declined in frequency with spatial separation between their shelters. Female kin did not engage in aggressive contests with one another, whereas non-kin females did, despite the fact these females lived at similar distances from one another on their groups' territories. Contests within male-male and male-female dyads did not clearly correlate with kinship. Non-kin male-male and male-female dyads lived at more variable distances from one another on their territories than their corresponding kin dyads. Together, our study <span>indicates that contests among group members can be mediated by relatedness in a sex-dependent manner. We also suggest that spatial relationships can play an important role in determining the extent to which group members compete with one another.</span></p>
Data and code for "Turning tables: food availability shapes dynamic aggressive behaviour among asynchronously hatching siblings in red kites Milvus milvus"
<p><strong>Abstract</strong></p> <p>Aggression represents the backbone of dominance acquisition in several animal societies, where the decision to interact is dictated by its relative cost. Among siblings, such costs are weighted in the light of inclusive fitness, but how this translates to aggression patterns in response to changing external and internal conditions remains unclear. Using a null-model-based approach, we investigate how day-to-day changes in food provisioning affect aggression networks and food allocation in growing red kite (<em>Milvus milvus</em>) nestlings, whose dominance rank is largely dictated by age. We show that older siblings, irrespective of age, change from targeting only close-aged peers (close-competitor pattern) when food provisioning is low, to uniformly attacking all other peers (downward heuristic pattern) as food conditions improve. While food allocation was generally skewed towards the older siblings, the youngest sibling in the nest increased its probability of accessing food as more was provisioned and as downward heuristic patterns became more prominent, suggesting that different aggression patterns allow for catch-up growth after periods of low food. Our results indicate that dynamic aggression patterns within the nest modulate environmental effects on juvenile development by influencing the process of dominance acquisition and potentially impacting the fledging body condition, with far-reaching fitness consequences.</p>
Railbelt 2050 Load, Electrification, and Behind-the-Meter Solar Hourly Load Demand for Aggressive and Moderate Electrification Forecasts
<p>The data in this file is comprised of hourly load demand data for the year of 2050 for Alaska's Railbelt transmission system from the aggressive and moderate load, electrification adoption, and behind-the-meter solar forcasts generated by the ACEP Railbelt Decarbonization Study. </p>
Effects of genotype and host environment on the cuticular hydrocarbon profiles of Lysiphlebus parasitoids and aggression by aphid-tending ants
Parasitoids in the genus Lysiphlebus specialize on ant-tended aphids and have previously been reported to mimic the CHC profiles of their aphid hosts to avoid detection by ants. However, the precise mechanisms that mediate reduced ant aggression toward Lysiphlebus spp. are not known, nor is it clear whether such mechanisms are broadly effective or specialized to particular aphid hosts. Here we explore the effects of wasp genotype and host environment on Lysiphlebus cuticular hydrocarbon (CHC) profiles and ant aggression. Rearing asexual Lysiphlebus lines in different host aphid environments revealed effects of both wasp line and aphid host on wasp CHCs. However, variation in genotype and host affected different features of the CHC profile, with wasp genotype explaining most variation in linear and long-chain methyl alkanes, while aphid host environment primarily influenced short-chain methyl alkanes. Subsequent behavioral experiments revealed no effects of host environment on ant aggression, but stronger evidence for genotypic effects. The presence of genotypic variation in experienced ant aggression and relevant chemical traits is particularly relevant in light of recent evidence for genetic divergence among Lysiphlebus parasitoids collected from different aphid hosts.
Tisagenlecleucel in Adult Patients With Aggressive B-cell Non-Hodgkin Lymphoma
ClinicalTrials.gov study NCT03570892. IPD Sharing: YES. Countries: 18. Publications: 3.
Efficacy and Safety of Midostaurin in Patients With Aggressive Systemic Mastocytosis or Mast Cell Leukemia
ClinicalTrials.gov study NCT00782067. IPD Sharing: UNDECIDED. Countries: 12. Publications: 3.
Effects of genotype and host environment on the cuticular hydrocarbon profiles of Lysiphlebus parasitoids and aggression by aphid-tending ants
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Aggression and spatial positioning of kin and non-kin fish in social groups
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Data from: The scope and adaptive value of modulating aggression across breeding stages: Case study in a competitive female songbird
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Data for: Coordination and persistence of aggressive visual communication in Siamese fighting fish
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Non-lethal fungal infection could reduce aggression towards strangers in ants
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Data from: Aggressive interactions influence cognitive performance in Western Australian magpies
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Vibrating aggression: Spider males perform an unusual assessment strategy during contest displays
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Data for: Aggressive hosts are undeterred by a cuckoo's hawk mimicry, but probably make good foster parents
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Anthropogenic noise, song, and territorial aggression in southern house wrens
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Hot-headed peckers: thermographic changes during aggression among juvenile pheasants (Phasianus colchicus)
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Is variation in female aggressiveness across Drosophila species associated with reproductive potential?
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Allen Brain Atlas
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