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Simple reason helps males evolve more quickly
11-14-2007 · EurekAlert!Evolutionary biologists have focused on sex differences since Darwin's "Origin of Species." A straightforward but seemingly underappreciated explanation for the ability of males to answer the call of sexual selection may be that their genetic machinery is simpler.
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Keywords: simple, reason, males, evolve, quickly, male
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- The love song of male túngara frogs
02-08-2007 · EurekAlert!
Male túngara frogs produce two types of calls to attract females: simple and complex. Female túngara frogs, as well as unintended receivers such as frog-eating bats and blood-sucking flies, prefer complex to simple mating calls. Bernal et al. tested whether bats and flies prefer complex calls because they indicate higher quality males and/or higher male density. The authors found that call complexity indicate higher abundance of prey/host.
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- How are phenotypic differences between sexes related to phenotypic variation within sexes?
01-10-2007 · EurekAlert!
It has long been recognized that sexually dimorphic traits -- traits that are systematically different between members of different sex in the same species, such as peacocks' tail feathers -- tend to vary a great deal among individual males, and that much of this within-sex variation depends on individual condition. Indeed, theory predicts that sexual dimorphism will evolve based on condition dependence so that, among traits, a more pronounced difference between male and female should be associated with a stronger response to variation in condition.
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- Mastodons in Musth: Tusks may chronicle battles between males
10-28-2006 · Science News Online
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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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- Rodent sperm work together for better results
01-23-2007 · EurekAlert!
Although, sperm are inseminated in millions each sperm goes it alone. However, under some circumstances it might be advantageous for sperm to cooperate with one another. This is especially likely to be the case when females are promiscuous and sperm of one male have to compete against those of rival males.
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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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- Use of mammograms in men is rising, but Mayo Clinic researchers find little reason to administer
12-16-2006 · EurekAlert!
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- Fish can determine their social rank by observation alone, study finds
01-24-2007 · EurekAlert!
A male fish can size up potential rivals, and even rank them from strongest to weakest, simply by watching how they perform in territorial fights with other males, according to a new study by Stanford University scientists. The researchers say their discovery provides the first direct evidence that fish, like people, can use logical reasoning to figure out their place in the pecking order.
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- Male owls pitch their hoots to advertise body weight to competitors
04-02-2007 · EurekAlert!
Male owls respond more strongly to the high-pitched calls that simulate lighter individuals, confirming that territorial males attend to pitch information advertising body weight in the calls of their competitors. The authors also found that the territory owners give slightly lower pitched hoots in response to calls mimicking heavier males, probably indicating that they attempted to sound heavier when challenged by more threatening individuals.
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- Study shows wild male chimpanzees use stolen food to win over the opposite sex
09-11-2007 · EurekAlert!
They say that the way to a man's heart is through his stomach and the same could be said for female chimpanzees. Researchers studying wild chimps in West Africa have discovered that males pinch desirable fruits from local farms and orchards as a means of attracting female mates. The study is published in the Sept. 12 issue of the online, open-access journal PLoS ONE.
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