Sunday, October 07, 2012
STAG WALKS INTO A BAR. Ever wonder why some male animals have bigger horns or other sexual ornamentation than others of their species? Working with rhinocerous beetles, zoologists led by a researcher at Montana State University demonstrated that male animals’ ornaments are insulin-dependent. According to a study published in August 2012 issue of Science, growth to gargantuan size reflects excellent nutritional status in any male showing them off. If so, obviously “hunky” male animals are also probably strong and have good endurance. It’s probably an attractive quality to females hoping to mate.
BORN TO BE WILD. Every motorcycle movie ever made suggests that some humans are more adventuresome than others. Apparently, it's true of honey bees, as well. Some consistently “take it on the road” to new territory. According to a March 2012 study in Science, there are massive genetic differences that set territorially bold honeybees apart from their fellows. At least a few relate to the molecular pathways implicated in novelty-seeking in humans.
2—HOGWASH TREATMENTS FOR AUTISM? The prevalence of autism is on the rise. But according to Vanderbilt University researchers reporting on August 27 in Pediatrics, every one of the interventions currently used for the growing numbers of adolescents and young children needing substantial support are based on insufficient evidence. The researchers examined 32 studies addressing medical, vocational, and behavioral interventions, and deemed all of them structurally flawed. In light of the current autism “epidemic,” the researchers have concluded that that more rigorous studies about care for adolescents and children with autism are urgently needed.
3—TALKING THROUGH THEIR NOSES. By creating a full map of the olfactory system of worker ants of two distinct species, a research team at Vanderbilt University has come to a new understanding of ant gender roles and ant communication. The map shows that females of the two species each have about 400 distinct odorant receptors. This is four to five times more than most other insects have, and about three times more than male ants of the species studied have. Reporting in the August 2012 issue of PLoS Genetics, the VU scientists speculate that smell is the probable fundament of ant communication. Chemical signals setting off specific odorant sensors would explain how ants live in a complex social system characterized by division of labor and the ability to collaboratively solve complex problems. The researchers suggest a reason that male ants have fewer odorant receptors than females. They are only responsible for fertilizing eggs. Females, it seems organize and do just about everything else.
4—STUMPING DARWIN. A “clade” is a group consisting of a species and all of the many species descendant from it. Given the glacial pace of evolutionary change, one of the most fundamental expectations in evolutionary studies is that species richness in a clade is a measure of its age. Now that central assumption has been thrown into question. Publishing this August in PLoS Biology, evolutionary biologists from UC Berkeley, the University of Michigan, and UCLA report testing the relationship between clade age and species richness across nearly 1400 major clades of multicellular fungi, plants, arthropods, and vertebrates that collectively account for more than 1.2 million species. The team found no evidence whatsoever between clade age and species richness. “This result appears to hold across the entire tree of life, for taxa as diverse as ferns, fungi, and flies,” the scientists report.
5—SOLVING THE NUCLEAR WASTE PROBLEM WHILE PRODUCING EXTRA ENERGY. Physicists at the University of Texas at Austin have been awarded a U.S. patent for a fusion-fission hybrid nuclear reactor that could someday be used to turn nuclear sludge into usable energy. Parts of the device are still in the conceptual phase. But a “tokamak,” which uses magnetic fields to confine super-high temperature nuclear waste and produce fusion reactions, has been manufactured and is being installed in the UK at Culham Centre for Fusion Energy. CCFE, just south of Oxford, is the UK’s national laboratory for fusion research.