Tag: "males" at biology news

DNA tests point to extinction of 2 distinctive arctic bird populations

...tgomerie is resolving the mystery of why ptarmigan males delay molting from their winter plumage each sprin....) The researchers conclude that brighter-plumaged males are more attractive to females and thus have more mating opportunities, leading to greater reproduct...

Scientists describe the world's smallest, lightest fish

...ely a third of an inch (8.4 millimeters) while the males measure just over a quarter of an inch (7 millimeters). Roughly 500,000 of these fish weighed together would barely tip the scales at one pound. A full scientific description of the animal was published in the latest issue of Records of the Australia...

Researchers identify gene for a primary form of sudden infant death sydrome (SIDS)

...neurological system and cause sudden death, and in males can also affect the reproductive system. According to Stephan, the relationship of TSPYL mutations or polymorphisms to SIDS in the general population will be studied next. Future work will examine the effects of this gene on the normal control of bre...

When male fish hum, females swim in, thanks to hormones, adaptable hearing

...s females to zero in on the love hums broadcast by males during the breeding season is providing scientists...s process couples the transmission of sound by the males and reception by the females. "We suspected that enhancing the sensitivity of the females' ear to t...

Hormone helps fish to mate, may affect human hearing

...low water environments like those where midshipman males build nests and sing their love song to attract fe...est Coast. During their seasonal mating time, when males move toward the shore from deep water and prepare to advertise their love nests, the humming chorus ...

Noah's modern ark: The role of ART in conserving endangered species

... AI using cooled as well as thawed sperm, and from males with terminal disease. The successful multi-dimensional management programme shows the way for the future in ART. "We have a 10-year plan in place to produce lots of baby pandas that can contribute to a successful, self-sustaining captive populatio...

Japanese researchers develop novel method of introducing transgenes into animals

...u-Shinohara and Shinya Toyokuni, 86 percent of the males injected with the retrovirus became fertile. Eight of 31 of these males (26 percent) later mated normally with wild-type female mice and sired offspring. An average of abou...

Sex-specific differences in gene expression related to drug metabolism and hypertension

... reports of differences in gene expression between males and females, there has not been a comprehensive st...p of the genetic and molecular differences between males and females. This map can be navigated to find insight into diseases known to have sex-specific prop...

Male susceptibility to disease may play role in evolution of insect societies

...ossibly affected are the division of labor between males and females and the relative social isolation experienced by males in many social insect colonies. The researchers looked at Hymenoptera, an order of insects, includi...

More news in the battle between the sexes

...xual conflict. Their results indicate that foreign males from the conflict populations are more costly to females than familiar males and that sexual selection can be costly to fitness. However, they also found that at intermediate le...

'Cardiofunk' mutation: Probable source of congenital heart defects

... to identify the key gene: Several dozen zebrafish males were exposed to a chemical mutagen, and hundreds of thousands of their progeny were screened for developmental abnormalities. This allows researchers to identify genes involved in development that had never been previously considered. The team identi...

Penguins ingest mollusk shells to obtain calcium for thicker eggshells

..., mainly clams and mussels, in their stomachs than males do. The mollusk shells gradually leach calcium used to form eggshells. Penguins typically nest on hard surfaces near coastlines and, if soil conditions are right, they might build burrows. Because they can't fly and are made to be agile swimmers rath...

For a male sand goby, playing 'Mr. Mom' is key to female's heart

...g the lady fish? Something some guys but few other males in the animal kingdom have thought of: It acts lik...nibbled on the eggs in their charge, unaccompanied males not only shirked their parental duties they also were more likely to gobble down entire clutches of...

March of Dimes awards $250,000 prize to pioneering scientist

... pairs are known as autosomes and are identical in males and females. Inheriting an excess number of an au...ny genes needed for growth and development by both males and females. These include genes that are necessary for normal blood clotting as well as genes for ...

New research finds summer-born women have fewer children

... in men born in summer and winter, indicating that males and females might respond differently to the season of birth." Dr Huber said there could be many possible causes for the association between birth month and reproductive performance. "It could be the effects of the conditions experienced during fetal...

Newfound grasshopper takes to the trees on Konza Prairie

... also an entomologist, subsequently collected five males and females from hackberry tree trunks in October 2003. Melanoplus punctualatus, the Grizzly grasshopper, was first identified in the United States in 1862 by an entomologist named Scudder, who specialized in grasshopper identification...

Young chimpanzees show sex differences in learning

...emales perfected the art of termite fishing, young males spent more time playing and swinging around--behav...hunt colobus monkeys," explained Lonsdorf. "Mature males often hunt monkeys up in the trees, but females are almost always either pregnant or burdened with a...

Culture of primate non-aggression

...o assume or maintain dominance with higher ranking males or engage in bloody battles with lower ranking mal...reak of TB infected and killed the most aggressive males of Forest Troop, drastically changing the gender composition and the behavior of the group; males we...

Oil exploitation in Ecuador's Amazon basin produces a 'public health emergency'

...8 found significantly higher rates of cancer among males in a village located in an oil-producing area. Another study, carried out in 2000, examined the differences in cancer rates over the period of 1985 to 1998 in the Ecuadorian Amazon and found a significantly higher overall incidence of cancers in both...

Laboratory rat gene sequencing completed

...nce for error Females carry two X chromosomes and males one. The study finds less mutation in the X chromosome than in chromosomes equally divided between males and females. A network of centers generated data and resources for the RGSP, including the BCM-HGSC...

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