Tag: "males" at biology news
Sneak copulations and the demise of the integrity of wild salmon populations
...ced by the relatively poor reproductive success of males
escaping from marine netpens. Recent evidence in ...ilizing large numbers of eggs. In fact, such farm males
are more successful at sneaking copulations, participating in more spawning events and having higher...
Chronic alcohol abuse damages regulating hormones
...s of water/electrolyte homeostasis." Two groups of males
participated in this study: alcoholics (n=35), 30 to 61years of age; and controls (n=20), 25 to 50 years of age. The two groups were matched on cigarette use. "It is well known that acute nicotine increases the secretion of AVP," explained Ehrenrei...
Solid management, natural resilience both key to sockeye success
..., Quinn says. The advantage goes to deeper-bodied males
when fighting for places to spawn and attracting f...ams run lower than usual. Then those deeper-bodied males
are more likely to become stranded and, because they stick up higher out of the water, are easier fo...
Male pregnancy in seahorses may affect formation of new species
...eproduction. The female inserts ripe eggs into the males
brood pouch, where the eggs are fertilized, embed ...nting technique used in humans. Researchers tagged males
and females in the field, sampled the DNA of the males
progeny and then determined the mother of tho...
Butterflies use polarized light to attract mates
...ented moving female butterfly wings to conspecific males
with and without filters that eliminate polarized light. Males of an iridescent species approached females producing polarized signals significantly more often when signals were not depolarized. Males of another, non-iridescent species approached f...
Butterflies are flashers to attract mates
... wings, and the other did not. She found that males
approached the wings that displayed polarized light significantly more than those wings that could not. According to Sweeney, while her experiments demonstrate that polarization is important in many iridescent species, not all iridescent species ...
Highway deaths highest for males Male urban squirrels, that is
...e Texas A&M University campus recently showed that males
are more likely than females to die on the road, and scientists believe it's because the males
dart about through the streets more. But wait. It was urban squirrels, not students, who were radio...
Roadsigns for rodents
...tory behaviour. This behaviour wasobserved in both males
and females. When a mouse found an area it was interested in, it would collecta white disc and move it there. The mouse would then continue toexplore, its movements focused on the discs location. Stopka andMacdonald observed that the mice would conti...
Obesity in Costa Rican children 'alarming,' likely future health burden
... prevalence of sedentarism among urban Costa Rican males
aged 1318 was double the rate observed among their rural counterparts. Studies conducted in the United States indicate that the relative risk of an obese child becoming an obese adult is six to seven times greater than that of his/her non-obese peer...
Tufts University biologists unveil more mysteries of fireflies flash
...en they flash their lights - and it looks like the males
are bragging. The National Science Foundation-fund...nd that female fireflies are strongly attracted to males
who give longer flashes because it indicates they are able to be better fathers by providing more of...
Neural biology explains ejaculation
...have families) and to help the 30 percent of adult males
who experience ejaculatory problems sometime in their lives. And what about women? Dr. Coolen also is developing research plans to determine if the same cells that cause ejaculation in men exist in the lumbar spines of women and if so, what they d...
Researchers find possible link between pre-natal alcohol consumption and diabetes
...es in both groups drank about 30 percent more than males
in both groups. The basal plasma AVP levels were ...ssociated with an increase in water intake in both males
and females. This is consistent with a decreased AVP release and consequent loss of free water and ...
Study says: 'whey' to greater muscle strength is through training and protein supplements
...ble-blind protocol thirty-three resistance-trained males
were matched for strength and placed into one of f...oups. Conclusions Experienced resistance-trained males
supplementing with CrCHO, W and CrW achieved greater increases in strength and lean mass following 1...
Bright beaks provide honest look at male immune system, Science study says
...rst direct evidence that the colorful beaks on the males
of two bird species gives honest information about... color in male blackbirds. In the animal kingdom, males
often sport the species' more flamboyant features, from peacock's tails to rooster's combs. While sc...
In a noisy world, how can the senses project and receive information at the same time?
...uring singing will be an advantage. It would allow males
to defend their territory from rival singing males, to maintain a fixed distance from each other, and to hear noisy predators This strongly suggests that the inhibition of the auditory pathway is the result of a corollary discharge from the stridulat...
As harmful as osteoporosis but less well known - New research better explains sarcopenia
...lyses. Differences in continuous variable between males
and females were tested with the Student's t-test. Pearson product-moment correlations were calculated to test associations among variables. Results Study participants were slightly overweight with a mainly central body fat distribution. Women had l...
Italian research reveals a new twist in the battle of the sexes
...for pregnancy and birth are optimal. Evidence that males
are more fragile than females and that fewer males
are conceived in sub-optimal conditions is not new. What is new in research published (Thursday 27 M...
Redheaded women respond better to painkilling drug
...ex-specific genetic circuitry that governs the way males
and females respond to pain. More generally, Mogil has been examining the genetic and environmental influences that combine to govern reactions to pain. At a minimum, pinpointing relevant genes can help doctors tailor dosages of drugs to each patien...
Scientists study roundworms for behavior patterns
...something they recognize as a mate. But the mutant males
that Garcia isolated don't wait for an encounter. They extend their sex organs spontaneously, trying to mate with a non-existent partner. Such mating gaffes, highly unusual in worms of conventional upbringing, demonstrate an apparent genetic link to...
Bone marrow stem cells are a source of insulin-producing cells
...m. He then transplanted the bone marrow from these males
into female mice whose bone marrow had been destroyed by radiation. After four to six weeks, Dr. Hussain detected a small number of the glowing green cells in the pancreatic islets of Langerhans of the female mice. Further analysis showed that t...
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