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Aggression in Biological News

Genes and environment interact in first graders to predict physical but not social aggression

Physical aggression in children comes from their genes and the environment in which they grow up. Social aggression, such as spreading rumors or ignoring other children, has less to do with genetic factors and more with environmental factors. One important environmental influence on children...

Gene variations contribute to aggression and anger in women

Ever wonder why some women seem to be more ill-tempered than others? University of Pittsburgh researchers have found that behaviors such as anger, hostility and aggression may be genetic, rooted in variations in a serotonin receptor gene. Indrani Halder, Ph.D., of the Cardiovascular Behavioral Medi...

Fruit fly aggression studies have relevance to humans, animals

Even the tiny, mild-mannered fruit fly can be a little mean sometimes ?especially when there's a choice bit of rotten fruit to fight over. And, like people, some flies have shorter tempers than others. Researchers in the North Carolina Sate University genetics department have identified a suite ...

Sex chromosome genes influence aggression andmaternal behavior, say UVa researchers

It has been well documented that, across human cultures and in most mammals, males are usually more aggressive and less nurturing than females. It's simple to blame male hormones, like testosterone, for male behavior such as aggression. But maybe it's in our genes, too. Indeed such social behavio...

New study examines how sense of smell affects mating and aggression in mice

New research by scientists at UCSF sheds light on how the odor detecting system in mice sends signals that affect their social behavior. "Understanding how mice process cues from the olfactory system--which regulates the sense of smell--should provide insight into the fundamental principles that...

Two is not company -- as far as fish are concerned

...s and white cloud mountain minnows. As Dr Katherine Sloman from the University of Plymouth explains 'fish kept alone or in pairs show higher levels of aggression than those kept in groups of ten or more; large groups are also more likely to exhibit natural behaviours such as shoaling'. Further research is nee...

Bullies have harassed 14 percent of workers over past 6 months

... and Jos Lus Graa, of the Faculty of Psychology at the Complutense University, have defined it in their study as a "process of systematic and repeated aggression by a person or group towards a workmate, subordinate or superior". Their research has been published in the latest issue of Psicothema . According...

Using 'dominance' to explain dog behavior is old hat

...c we very often see dogs which have learnt to show aggression to avoid anticipated punishment. Owners are often ...hat their dog is terrified of them, and is showing aggression because of the techniques they have used but its ...ners. They can be very fearful, which can lead to aggression towards people. "Sadly, many techniques used t...

Caltech researchers train computers to analyze fruit-fly behavior

...h) have trained computers to automatically analyze aggression and courtship in fruit flies, opening the way for ...etic analyses to complicated social behaviors like aggression and courtship, you need accurate ways of measuring... two began training computers to see and recognize aggression and courtship behaviors. The result? An automated ...

Skin cancer study uncovers new tumor suppressor gene

...rchers found that mice injected with cells expressing normal MMP-8 did not develop skin ulcers, which are one of the most important measures of cancer aggression in melanoma. In contrast, mice injected with cells expressing mutated MMP-8 went on to develop ulcerations and metastases in their lungs. ...

If you're aggressive, your dog will be too, says veterinary study at University of Pennsylvania

...listed in the survey, all of which may provoke fearful or defensively aggressive behavior. Their common use may have grown from the idea that canine aggression is rooted in the need for social dominance or to a lack of dominance displayed by the owner. Advocates of this theory therefore suggest owners establ...

Small male chimps use politics, rather than aggression, to lead the pack, U of Minnesota study says

...o, one of the largest and most aggressive male chimpanzees ever observed at Gombe, weighed 51.2 kg (112.6 lbs.) at his peak. He relied on his size and aggression to rule. While he allowed other chimpanzees to groom him, he seldom returned the favor. At the other end of the spectrum, Wilkie, who weighed only 37 ...

The Evolution of Human Aggression: Feb. 25-27 conference

...eb. 25-27 to debate how evolution has shaped human aggression and violence, from war to domestic abuse and homic... at the University of Utah. "Many aspects of human aggression will be addressed at this conference: warfare, hom...d understanding of the evolutionary basis of human aggression may help individuals prevent violence in their own...

Male crickets with bigger heads are better fighters, study reveals, echoing ancient Chinese text

...ant subjects for researchers interested in studying the evolution of animal aggression and the settlement of contests between individuals. For all that study, the...SERC-funded study provides a new avenue by which researchers can understand aggression in field crickets. ...

Mothers pass on disease clues to offspring

...he offspring from the control dams. The research group in the University's School of Biology have studied many populations of mice, and noted that aggression is associated with social dominance and territory acquisition and consequently increased access to mating opportunities. However, studies in a wide r...

U of Minnesota researcher finds link between aggression, status and sex

...ng away from a fight, can be evolutionary suicide. aggression can lead to status. A higher status leads to sex, ...higher-quality offspring." The evolved pull of aggression was shown in a series of three studies. Results sh...nd to watch the situation, suggesting that much of aggression is about display, rather than self-defense. Sta...

What is the origin of ethics?

...urnal of Evolutionary Biology. He works on the evolution of all forms of social behaviour in microbes, such as co-operation within or between species, aggression and fighting, and even spite. Link to Professor West's homepage: http://www.biology.ed.ac.uk/research/institutes/evolution/homepage.php?id=swest ...

Despite 'peacenik' reputation, bonobos hunt and eat other primates too

...r the discussion about male dominance and bonding, aggression and huntinga domain that was thought to separate c...very challenges the theory that male dominance and aggression must be causally linked to hunting behavior, an idea held by earlier models of the evolution of aggression in human and non-human primates. Future work on th...

Is that song sexy or just so-so?

...ering a system of brain nuclei, common to all vertebrates, called the "social behavior network." "Social behaviors such as courtship, parenting and aggression depend primarily on two factors: a social signal to trigger the behavior, and a hormonal milieu that facilitates or permits it," says Emory neuroscien...

Neighbors from hell: Infanticide rife in guillemot colony

...e elements, guillemot colonies are a risky place to raise a chick. Although aggression between adults is common - breeding pairs often are in physical contact and...can be densely packed with up to thirty breeding pairs in one square metre aggression toward chicks is unusual. The research focused on a large establi...

The truth about cats and dogs

... all sweetness and light (or, for that matter, bones and catnip). There was a reported indifference between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes. One reason for the fighting might have been crossed inter-species signals. Cats and dogs may not hav...

Primate's scent speaks volumes about who he is

... of silent, cryptic communication going on in lemur society. Wearing a scent-based nametag declaring one's genetics is probably useful in avoiding aggression with closely related males, Drea said. It's also quite likely to help prevent inbreeding by signaling family relationships to females, but the researc...

High hormone levels in seabird chicks prepare them to kill their siblings

...02460 . The elevated levels of male hormones, called androgens, increase aggression in both male and female chicks and prepare the birds to fight to the death ...me Nazca booby nestlings experience a one-two hormonal punch, raising their aggression hormones even higher when they actually have a nest mate. The nestlings th...

Estrogen helps drive distinct, aggressive form of prostate cancer

... malignancies." Research into just why fusion-positive prostate cancers are so aggressive -- and potential molecular drug targets to help curb that aggression -- will continue under Dr. Rubin's direction at Weill Cornell, in collaboration with members of his group and with computational biologist Dr. Frances...

Playing dead is no game for ant survival

...ghboring colonies. This tactic makes them four times more likely to survive aggression than older workers who fight back. As a result, these young workers are abl...gressors. It may be that young workers pretend to be dead to avoid physical aggression at a time when they are vulnerable to injury and certain to fail. Another e...

Why serotonin can cause depression and anxiety

... thus to redress the balance. This study gives insight into some puzzling findingsfor example, it argues that the association of depression with aggression may have to do with a lack of reflexive avoidance of it. In addition, stress not only causes depression, but people with depression experience more st...

Piddling fish face off threat of competition

...heir dominant status through urinary odorants, which are thought to control aggression in rival males and so maintain social stability within the area, or lek. By...pped urination when their opponent gave up, indicating a close link between aggression and urination rate. By also collecting urine and measuring the volume over ...

Effects of social isolation traced to brain hormone

... The anxiety and aggression that result from social isolation have been traced to altered levels of an ...can be responsible for a range of psychological effects, including anxiety, aggression and memory impairment," said Dr. Erminio Costa, director of the UIC Psychia...

Humans and monkeys share Machiavellian intelligence

...e females in the group with whom they want to have sex. Like human dictators intent on holding power, dominant monkeys use frequent and unpredictable aggression as an effective form of intimidation. Less powerful members of the rhesus macaque group are marginalized and forced to live on the edges of the groups...

Testosterone turns male juncos into blustery hunks -- and bad dads

...l amount of testosterone in a male bird that determines his tendency toward aggression and monogamy. The latest findings suggest it's a bit more complicated. It's...hat individual variation in the hormone testosterone maps onto variation in aggression and parental behavior," said Ketterson, senior author of the study. "Our da...

Presence of gene mutation helps guide thyroid cancer treatment

... A specific gene mutation may be useful in predicting the level of aggression of thyroid cancer and help guide treatment options and follow-up care, according to new study findings. The mutation, called BRAF V600E, is a gene...

Mice use specialized neurons to detect carbon dioxide in the air

...ls may adapt to this gradual and persistent increase. Alternatively, the change may induce behavioral changes, such as an increase in irritability and aggression or a decrease in fertility," he says. ...

Female-led infanticide in wild chimpanzees

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

Hives ferment a yeasty brew, attract beetle pest

...der time containing the beetles in their hives. European honeybees were bred to be docile and easy to 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 ...

Female chimps keep the bullies at bay

...hronizing estrous cycles may be a female strategy to reduce male sexual coercion." Indeed, male 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 i...

Low levels of neurotransmitter serotonin may perpetuate child abuse across generations

...uced less serotonin, a chemical that transmits impulses in the brain. Low levels of serotonin are associated 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 di...

With fruit fly sex, researchers find mind-body connection

...ublesex and fruitless act together to help regulate behavior in the context of other developmental 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...

Invasive ants territorial when neighbors are not kin

...undreds of miles. Researchers have disagreed on the reason for the lack of aggression between ants from different nests in the same colony. "Some ecologists have hypothesized that environmental factors act to reduce aggression among Argentine ants in California," said David Holway, an assistant profes...

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

...er adults use a special "purr" call to recruit inexperienced fledglings to rich, divisible food sources (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 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. ...
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