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Tag: "aggression" at biology news

Female-led infanticide in wild chimpanzees

... the new findings indicate that although low-level aggression between female chimpanzees is more commonly seen, ...rved instances of infanticide indicate that deadly aggression is not a gender-specific trait in this species. ...

Hives ferment a yeasty brew, attract beetle pest

...o work with, while African honeybees are noted for aggression and a propensity to sting. The beetles were first seen infesting U.S. beehives in Florida in the late 1990s. The researchers tested the response of both the small hive beetles and honeybees to isopentyl acetate (IPA), the major chemical in the bee...

Female chimps keep the bullies at bay

... chimpanzees use coercive tactics such as physical aggression against females, forced copulation, harassment and intimidation to increase their reproductive success. The opportunity for males to coerce females is reduced when females avoid synchronizing their estrous cycles, because with fewer females in estro...

Gene variations contribute to aggression and anger in women

... found that behaviors such as anger, hostility and aggression may be genetic, rooted in variations in a serotoni...ve associated the hormone serotonin with anger and aggression in both humans and animals and have shown that increased serotonin activity is related to a decrease...

Low levels of neurotransmitter serotonin may perpetuate child abuse across generations

...sociated with anxiety and depression and impulsive aggression in both humans and monkeys. Abused females who became abusive mothers in adulthood had lower serotonin in their brains than abused females who did not become abusive parents, the research showed. Because the biological make up of humans and mon...

With fruit fly sex, researchers find mind-body connection

... genes." How genes contribute to behavior, from aggression to alcoholism, is a growing and contentious area of biology. For more than a decade, McKeown has been steeped in the science, using the fruit fly as a model to understand how genes build a nervous system that, in turn, controls complex behaviors. Sin...

Invasive ants territorial when neighbors are not kin

...chers have disagreed on the reason for the lack of aggression between ants from different nests in the same colo...othesized that environmental factors act to reduce aggression among Argentine ants in California," said David Holway, an assistant professor of biology at UCSD an...

'Empty nester' parent birds use recruitment calls to extend offspring care

...ces (adults responding to the calls often met with aggression from the caller). The researchers found that fledglings that responded to this call were much more successful than those sticking to areas chosen by themselves. This work shows that recruitment calls by adult birds may prolong offspring care beyond t...

Adolescent but not adult hamsters are more aggressive on low dose of fluoxetine

...r in the brain's synapses. It is known to inhibit aggression in adult hamsters. Hamsters are often used as an ...s ?some of which inhibit and some of which enhance aggression -- are implicated in the findings of higher aggression on low doses. ...

Fighting like a girl or boy determined by gene in fruit flies

... new animal model for understanding the biology of aggression and how the nervous system gives rise to different... do not change.) He contacted Kravitz, hoping that aggression studies would resolve the lingering question of male behavior changes. Meanwhile, co-author Stev...

Male chimpanzees prefer mating with old females

...les, and gave rise to higher rates of male-on-male aggression in mating contests. The findings, in addition to supporting the idea that long-term pair bonding and menopause may contribute to the preference of human males for young females, also suggest that this characteristic may be an evolutionarily derive...

Changing length of days reverses how estrogen affects aggressiveness in mice

...lass of hormones called estrogens acts to increase aggression in males of a particular type of mouse called the ...er, in the long days of summer, estrogen decreases aggression among male Oldfield mice, a species commonly found in the southeastern United States . "We found ...

Fruit fly aggression studies have relevance to humans, animals

...tment have identified a suite of genes that affect aggression in the fruit fly Drosophila melanogaster, pointing...o new mechanisms that could contribute to abnormal aggression in humans and other animals. The study, led by doctoral student Alexis Edwards in the laboratory o...

Just like us, social stress prompts hamsters to overeat, gain weight

...een the hamsters, the authors explained. "Hamster aggression is highly ritualized, with dominance or submission generally established within the first minute and maintained thereafter through social signals and social communication between the opponents," the authors wrote. The intensity of most agonistic enco...

The higher the hierarchy, the greater the aggression

...group members inflict or receive many more acts of aggression than others. In some cases, these acts (which incl...ttered in a cooperative society, then the rates of aggression would be highest toward the front of the queue and that the aggression would increase as the time av...

Dominant meerkats render rivals infertile

... meerkats subject their subordinates to escalating aggression and temporary eviction causing them to become overly stressed and as a result infertile, a new study finds. The new research reports that during the latter half of her pregnancy, the dominant female in a meerkat group commonly drives her subordinat...

Sex chromosome genes influence aggression andmaternal behavior, say UVa researchers

...emistry and molecular genetics at UVa, who studied aggression and maternal behavior in genetically engineered mi...uld lead to the discovery of new genetic bases for aggression and parental behavior in other animals, including humans." ...

Taking a bite out of a fellow worker helps wasps recruit new foragers

... that are shared among all social animals. Social aggression is one such characteristic that is almost universal among animal groups ranging from insects to primates including humans. ...

Animal models show that anabolic steroids flip the adolescent brain's switch for aggression

...bruary's Behavioral Neuroscience, also showed that aggression rose and fell in synch with neurotransmitter levels in the brain's aggression control region. Behavioral Neuroscience is published by the American Psychological Association (APA...

Depression model leaves mice with molecular scar

...depressants," explained Nestler. Mice exposed to aggression by a different dominant mouse daily for 10 days became socially defeated; they vigorously avoided other mice, even weeks later. Expression of a representative gene in the hippocampus, a memory hub implicated in depression, plummeted three-fold and re...

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