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Females do best if they wait a while
04-05-2007 · EurekAlert!Starting to breed late in life is a bad idea if you want to maximize the number of offspring that you produce -- or so the theory goes.But doubt has now been cast on this hypothesis -- one of the biggest assumptions in behavioral ecology -- by researchers from the universities of Bristol and Cape Town and published today in Current Biology.
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Keywords: females, wait, female
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- Sex is thirst-quenching for female beetles
08-28-2007 · EurekAlert!
Female beetles mate to quench their thirst according to new research by a University of Exeter biologist. The males of some insect species, including certain types of beetles, moths and crickets, produce unusually large ejaculates, which in some cases can account for around 10% of their body weight. The study shows that dehydrated females can accept sexual invitations simply to get hold of the water in the seminal fluid.
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- Vaginal reconstruction not needed for most inter-sex females, Hopkins study shows
10-27-2007 · EurekAlert!
Dispelling a common myth, researchers from the Johns Hopkins Children's Center say vaginal reconstruction should be a matter of preference for most teens or adult women born with a type of inter-sex condition marked by the presence of both female and male genitals.
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- Wild chimpanzees appear not to regularly experience menopause
12-13-2007 · EurekAlert!
A pioneering study of wild chimpanzees has found that these close human relatives do not routinely experience menopause, rebutting previous studies of captive individuals which had postulated that female chimpanzees reach reproductive senescence at 35 to 40 years of age. Together with recent data from wild gorillas and orangutans, the finding suggests that human females are rare or even unique among primates in experiencing a lengthy post-reproductive lifespan.
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- Female auto crash rates increase alarmingly; airbags can be dangerous for tall and small people
05-16-2007 · EurekAlert!
Automobile crashes remain the leading cause of death for adolescents and young females are beginning to show an alarming increase in fatal automobile crashes related to alcohol use and a failure to use seatbelts. Another study found that airbags, while effective for people of medium stature (5'3" to 5'11") were actually harmful to people smaller than 4'11" and taller than 6'3".
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- Females more prone to brain damage from alcohol abuse
07-25-2007 · EurekAlert!
Alcoholism has traditionally been considered a male disease because there are many more alcoholic males than females. But a study by researchers at Oregon Health & Science University and the Portland Veterans Affairs Medical Center suggests that women are more prone to brain damage from alcohol abuse than men. The study found that female mice are more susceptible to neurotoxic effects of alcohol withdrawal, including significantly increased brain cell death, than male mice.
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- Why the best things come to those who wait
10-19-2006 · EurekAlert!
Pushing to the front of the queue is not the best ploy for males who want to propagate their genes according to scientists from the University of Exeter. Dr David Hodgson and Dr David Hosken from the University of Exeter's School of Biosciences studied female mating with multiple males, especially species who mate with more than one partner in rapid succession, and discovered why the last male in line is most likely to impregnate the female.
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- For Pacific white shrimp, gender matters when competing for food
12-12-2006 · EurekAlert!
A new study in Journal of the World Aquaculture Society suggests that, while larger shrimp consistently win over smaller shrimp of the same gender when competing for food, male shrimp will almost always beat female shrimp -- even though adult males of the species are typically much smaller than the adult females of the same age.
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- The precise role of seminal proteins in sustaining post-mating responses in fruit flies
12-17-2007 · EurekAlert!
Successful reproduction is critical to pass genes to the next generation. In sexually reproducing organisms, sperm enter the female with seminal proteins that are vital for fertility. In a new study published on Friday, Dec. 14, 2007 in PLoS Genetics, researchers at Cornell University knocked down the levels of 25 seminal proteins individually in male fruit flies, testing the males' abilities to modulate egg production, sperm storage and release, and the females' post-mating behavior and physiology.
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- Female pronghorns choose mate based on substance as well as show
10-23-2006 · EurekAlert!
When a female animal compares males to choose a mate, she can't order a laboratory genetic screen for each suitor. Instead, she has to rely on external cues that may indicate genetic quality. Until now, biologists have focused on elaborate ornaments, such as the peacock's tail, as cues that females might use.
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- Sex in the morning or the evening?
06-25-2007 · EurekAlert!
Male fowl are more sexually active in the evening when fertilization is more likely, but females change depending on the population. Females solicit sex in the evening in female-biased populations, where females have more control. However, in male-biased populations, male sexual harassment of females is intense, especially in the evening, so females solicit sex early in the morning and avoid males in the evening.
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