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Timing Helps Hummingbirds Know When They Are At Last Flower
Edinburgh, UK (SPX) Mar 07, 2006 By observing rufous hummingbirds revisiting flowers that refill with nectar at regular intervals, researchers have found that these birds can remember when they last visited individual flowers. This so-called "interval timing" is an ability that has received much attention in the laboratory. Lab studies have shown that animals can learn to time one or two short intervals (on the order of seconds to 1� hours). However, almost nothing had been known about whether animals in the wild can do this in the course of their normal behavior. The new findings are reported in the March 7th issue of Current Biology by Dr. Susan Healy of the University of Edinburgh, Dr. Andrew Hurly of the University of Lethbridge, and colleagues. Hummingbirds that defend territories containing many flowers can remember which flowers they have visited. Because many flowers refill their nectar supplies, it would be very efficient if a territorial hummingbird could also remember when it last emptied a specific flower, so as to plan when to return to next harvest nectar. Returning too early would result in a wasted trip. Returning too late might result in another animal's taking the nectar. Thus, accurate measures of time intervals would support efficient harvesting of nectar. In the new work, the researchers found that free-living hummingbirds tested in their breeding territories in the Canadian Rocky Mountains have timing abilities that are considerably more impressive than those that have been shown previously in the laboratory. Not only were the hummingbirds able to remember how long it had been since they had last emptied a flower, but they could also keep track of the time since the last visit to eight different flowers, and could continue to do this through the course of a day. In essence, these birds can maintain, over long periods of time, at least eight independent stopwatches, each of which is started by a visit to a particular flower and is reset when the bird next empties that flower. The work shows that animals in the real world are capable of more impressive timing feats than have been previously considered. The findings also suggest that animals may be capable of planning their future with some degree of precision. Community Email This Article Comment On This Article Related Links University of Edinburgh University of Lethbridge Current Biology Darwin Today At TerraDaily.com
New Method For Identifying Microbes
Upton NY (SPX) Mar 06, 2006Scientists at the U.S. Department of Energy's Brookhaven National Laboratory have developed a new, high-throughput technique for identifying the many species of microorganisms living in an unknown "microbial community." The method, described in the March 2006 issue of Applied Environmental Microbiology, has many applications. |
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