Tag: "mates" at biology news

Scientists find insects can alter plant chemistry to help them find mates

...dead prairie plants, emerging male gall wasps find mates by calling upon the chemistry prowess of their predecessors, entomologists scouring Central Illinois have discovered. In the Proceedings of the National Academy of Sciences, they report that as adult gall wasps (Antistrophus rufus) feed in warm weath...

Facial markings help paper wasps identify each other

...identification. Because of the chemical cues, nest mates were able to distinguish between friends and intruders and then to associate the painted markings with rank. With this recognition, aggression declined. "Basically the wasp sees a painted wasp with altered markings and thinks, 'She smells right, so s...

Ancient defense mechanism may still be protecting us

... sequences than the smaller one, and when the cell mates to create a new generation of cells, this large macronucleus withers and dies. Before it completely expires, however, the small nucleus steps in and produces a new large and small nucleus set. To make sure no new viral sequences have sneaked into the...

Sex and genetics: Why birds are unfaithful to their partners

...nternational team of scientists showed that social mates that are genetically similar use alternative repro...they found that extra-pair parentage occurred when mates were more closely related (Nature, Oct. 10th, 2002). Over the past decade, the use of molecular tech...

Breeding programs should incorporate mate choice

...problem is that while animals usually choose their mates in the wild, they typically do not get a choice when bred in captivity. The benefits of mate choice can include increased resistance to disease among offspring, and new work calls for incorporating mate choice into captive breeding programs. "Circumv...

Men are faster than women. but does that mean bets should always be placed on colts?

...dred years, whereas humans do not select their own mates based solely on running ability. In conclusion, although male horses and dogs do hold a slight speed advantage over conspecific females, the difference is an order of magnitude smaller than that seen in humans (one percent versus 10 percent). Facto...

Tropical forests under surveillance

...ush and male beetles who secretly manipulate their mates were the study subjects mentioned as biologists came up with a "wish list" of questions to be answered if the appropriate technology were available. Roland Kays, Curator of Mammals at the New York State Museum commented that the first challenge to a...

Ecological risks of GMOs come in unexpected ways, model shows

...f the male, which results in the male finding more mates and also living longer. But if the modification also has a third effect of making the male less fertile, the predicted result is that the wild population will be extinct in just 20 generations. "We consider this an extreme risk," Howard said. "That's...

Death by color: Spiny spiders' bright stripes attract prey

... animal kingdom color is used generally to attract mates rather than to entice prey, says a Cornell University animal behavior researcher "Attraction is all casinos are about. They lure you; they want to get you there. They lure people with bright lights, cheap plane tickets, inexpensive hotel rooms, great...

Male starlings sing a song of reproductive fitness

...ke singing talent into account when choosing their mates and is an important first step towards proving a d...h as hormones that help male birds look like ideal mates might actually at the same time be suppressing their immune systems, making it too risky for any but...

Cost of inbreeding in Arabidopsis

...aturally mates with itself 99 percent of the time - its pollen will fertilize its own stigma." Flies forced to inbreed for thousands of generations might show the deleterious mutati...

New dinosaur related to Triceratops

...rge jaw muscles or display features for attracting mates and/or intimidating rivals and predators. Perhaps both theories are correct. Liaoceratops has a small horn facing sideways under each of its eyes that seem to be display structures, according to Dr. Makovicky. The frill, which gets very large in adv...

Growth factor receptor signaling critical to intestinal tumor development, studies show

...gfr was partially impaired. The other mice, litter mates of the first group, bore the same Apc-Min mutation, but also had normal Egfr genes. Within three months, the first group developed 90 percent fewer intestinal polyps than the second, which showed that Egfr signaling was critical to intestinal tumor f...

HIV-like virus detected in wild chimpanzee

...or twenty years, he said. They know all its sexual mates and its history of sexual activity. So, we can analyze samples from those mates and their offspring and begin to understand how this virus perpetuates itself in the wild. From such...

Crayfish robots on Mars

...example, finding food and selection of appropriate mates and nesting sites. Where humans use millions of neurons to achieve such outcomes, invertebrates do it with thousands. Where humans use hundreds, invertebrates may use as few as six," he says. "It is this parsimony, that ability to control complex b...

Mice point to genetic basis for obsessive grooming

...med their normal cage mates. "The grooming of cage mates was normal grooming and not a dominance behavior called 'barbering,' in which mice remove the whiskers of other mice," said Capecchi. "Also, the cage mate grooming demonstrated that the knockout mice were not just grooming themselves because they had...

Scientists study how the lobster's nose knows

...loor, the chemical trails left by prey, predators, mates and competitors must make a confusing tangle - each filament of odor intertwining with the others until discovering the source of any one of them starts to seem as impossible as untangling a ball of liquid yarn. But somehow the lobster does it, and a...

Elephants pick up good vibrations - through their feet

...ced considerably," she concludes. Mock charges and mates The implications of O`Connell-Rodwell`s research a...y`re also sending out seismic signals to potential mates far away. "Elephants may be able to sense the environment better than we realize," O`Connell-Rodwell...

Parasite's sperm-encryption keeps species apart

...d with an uninfected female. If, however, the male mates with an infected female, the damaged reproductive cells are rescued by the females parasite. Its as if the bacterium encodes the sperm cell, rendering it useless unless it encounters the de-coding bacterium from another infected wasp. The result is t...

Biologists uncover Darwins missing evidence for divergence of species in a warblers song

...rbler, as in most songbirds, males sing to attract mates and to defend territories," says Irwin. "The green...different that they do not recognize each other as mates or competitors. They act like separate species, and the genetic evidence supports that conclusion. ...

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