Tag: "nectar" at biology news

Study in Royal Society journal on possible genetic factors in social responsiblity

..., H-1117, Hungary Paying for nectar with wingbeats: a new model of honeybee foraging by Dr AD Higginson and Dr FS Gilbert Honeybees acquire wing damage as they age and older foragers visit lavender inflorescences with fewer flowers. As wing damage increases wingbeat frequency increas...

New pheromone creates buzz about the clout of older bees

...nt balance between the ones that go out to collect nectar and pollen and defend the hive, and those that stay home and nurture the larvae. Huang had documented that this balance is controlled by the elder bees, those that typically spend the final one to three weeks of their five-week lifespan out in the fi...

Hummingbirds lose power at high altitudes

...aneuvers, above and beyond hovering at flowers for nectar or insects," he said. "They are constantly using much more mechanical power to do other interesting things, such as competing with other males and courting females." Their mating display, for example, consists of repeated vertical ascents and p...

Amino acids in nectar enhance butterfly fecundity: A long awaited link

...ed intriguing mechanisms and attractants, of which nectar is best known. Thirty years ago, researchers disc...ings led to speculations about the significance of nectar amino acids for butterfly fitness and insinuated that butterflies have acted as agents of natural se...

Study in Royal Society journal on heritability of female orgasm

... Evidence for pollinator sharing in Mediterranean nectar mimic orchids: absence of premating barriers? By Professor S Cozzolino, dr FP Schiestl, dr A Muller, dr O De Castro, dr A Nardella and Pr A Widmer (rspb.2005.3069) The intricate and specialized orchid-pollinator interaction has always been particula...

Hummingbird flight an evolutionary marvel

...ly - an evolutionary advantage in feeding on plant nectar that no other bird has - and an elegance that has ...y other type of flight, but as insects have found, nectar from a flower is an even bigger payoff." "Hummingbirds arrived at the ability to hover from a totall...

When do mosquitoes prefer a blood banquet, or a sugar feast? Three genes make the call

...rs which they eat in the form of rotting fruit or nectar let them double their weight in fat so they can survive without food until the next spring. Though researchers have long known about this diet change, this is the first time anyone has determined exactly why it happens. As the days begin to get shor...

Bees solve complex colour puzzles

... artificial flowers of a particular colour using a nectar reward. They then tested the bees' ability to find the same flowers in scenes that were simultaneously illuminated by four differently coloured lights UV-yellow, blue, yellow and green. To solve this puzzle, the bees had to effectively segment the s...

ASU researchers find link between social behavior, maternal traits in bees

...nding the hive, raising the young and foraging for nectar and pollen. Other species of bees, like carpenter ... were associated with bees that foraged mostly for nectar (the low pollen-hoarding strain). Using that as a foundation, Amdam and Page hypothesized that that ...

With a sense of timing, hummingbirds know when they've last emptied a flower

...s hummingbirds revisiting flowers that refill with nectar at regular intervals, researchers have found that ...ey have visited. Because many flowers refill their nectar supplies, it would be very efficient if a territorial hummingbird could also remember when it last e...

Scientists map the flight of the bumblebee

...y pollinate plants in their search for their food, nectar and pollen from flowers. Worldwide, up to 40 per ...ust visited to tell others they have taken all the nectar ...

Bumble bees can estimate time intervals

...apsed durations. Insect pollinators feed on floral nectar that depletes and renews with the passage of time,...s' ability to time the interval between successive nectar rewards. Using a specially designed chamber in which bumble bees extended their proboscis to obtain ...

Spread of plant diseases by insects can be described by equations that model interplanetary gravity

... moths in the course of pollinating and feeding on nectar from white campion flowers at the University of Virginia's Mountain Lake Biological Station. As predicted by the behaviour of insects, the disease was more likely to spread shorter distances between plants that had many flowers. "This implies that k...

Animal physiology conference sheds light on human physiology

...s get their energy from sugar found in nectar. But nectar is mostly water, so the birds need to consume a lot of it to get enough sugar. Their kidneys must get rid of all that water by filtering it very fast. But because they have a very high respiration rate, they must conserve water when they are not feed...

Rearing an army to save wheat

...rch explored whether supplemental food provided as nectar from flowering plants or as honey water increases the number of parasitic wasps produced in each cage. Another part of his thesis project examined whether using special ultraviolet and visible light-transmitting windows increases the number of parasi...

Honey bee genome holds clues to social behavior

...or eggs and larvae, and then shift to foraging for nectar and pollen as they age. However, if the hive has a shortage of foragers, some of the young nurse bees will switch jobs and become foragers. The job transition, whether triggered by age or social cues, involves changes in thousands of genes in the hon...

New behavior may use old genes

...d that preferential foraging of pollen rather than nectar is associated with a complex system of physiology,...cialization of worker bees into pollen foraging or nectar foraging roles appears to be important for the social structure of the honeybee society and for the ...

Biological clock of honey bee more similar to humans than to insects

...biological clock for timing visits to flowers when nectar and pollen flow is at its highest. They can learn to reach flowers at nine different points of time during the day within an accuracy of about 20 minutes. The clock is also essential for navigation that uses the sun as a compass because the sun moves...

Food for flight

...tes in central Mexicoa long flight fuelled only by nectar from flowers still blooming on the way. In recent ...fect the availability of the butterfly's preferred nectar sources along their migratory routes. In September and October, large numbers of monarchs pass throu...

The floral network -- what determines who pollinates whom

...pring wildflowers, abuzz with busy insects seeking nectar and spreading pollen, may look like a perfect mode...between species. An insect will be unable to reach nectar in floral tubes longer than its proboscis; the tube length sets up a barrier to some species, but no...

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