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Tag: "altitude" at biology news

Tundra disappearing at rapid rate

... Science, reconstructed changes in the density and altitude of treeline forests in southwestern Yukon over the past 300 years. Using tree rings, they were able to date the year of establishment and death of spruce trees and reconstruct changes in treeline vegetation. The study is published in the "Journal of ...

Is there a pilot in the insect?

...ect changes speed, this reflex will make it change altitude so that ratio remains constant. Adjusting the spee... flow regulator will constantly force it to reduce altitude so that the optic flow always remains at the reference value. The insect has to make a forced landin...

Scientists discover new species of distinctive cloud-forest rodent

...net." The new rodent was discovered at an altitude of 6,200 feet. Little is known about its lifestyle because subsequent efforts to locate and observe the animal were fruitless. I. barbarabrownae belongs to a family of rodents known as "spiny rats" because most of the species in that family bristl...

Viagra improves high altitude exercise performance up to 45% for some

...at sea level. Ten cyclists who took sildenafil at altitude collectively lowered the time it took to cover six...f the arteries when the cyclists were at simulated altitude of 12,700 feet. But the researchers discovered that these improvements occurred largely because so...

Atmospheric ozone recovering in mid-latitudes, report shows

...decade in the 11- to 15-mile (18- to 25-kilometer) altitude region to the Montreal Protocol, enacted in 1987, ...er than atmospheric chemistry. The changes in this altitude range - below the region where ozone-depleting gases derived from human activity are thought to caus...

Sociality of sweat bees evolved simultaneously during climate change

... even within species as a function of latitude and altitude such that species and populations at low latitudes and in warmer regions are often fully social, whereas they are solitary at higher latitudes and altitudes, which are colder." Warmer regions have longer growing seasons, he explained, which allows ...

Bats use touch receptors on wings to fly, catch prey, study finds

...sitive receptors on bats' wings help them maintain altitude and catch insects in midair. His preliminary findings, presented at the recent Society for Neuroscience meeting, revive part of a long-forgotten theory that bats use their sense of touch for nighttime navigation and hunting. The theory that bats fly...

Sensor web simulation investigates technique to improve prediction of pollution across the globe

...s from the Earth's surface to roughly the cruising altitude of a passenger jet - about 40,000 feet. In some cases air pollutants have natural causes such as lightning induced wildfires that can emit large plumes of particulates into the troposphere. Fossil fuel burning in industrial areas and vehicular traffi...

Expanding forests darken the outlook for butterflies, study shows

...ity and smaller meadows. According to Roland, the altitude of the tree line in the Canadian Rockies is rising--likely due to global warming--and, outside of national parks, forest fires are usually suppressed. These factors are combining to create larger forests and smaller alpine meadows. This is bad news f...

Going To Extremes To Improve Human Health

...er, is a 12-foot-square room capable of simulating altitude up to 18,000 feet, holding temperature constant at a set point between 14 and 122 degrees Fahrenheit, and controlling humidity anywhere from 10 to 95 percent. The chamber is so finely tuned that it can swing from the coldest to hottest setting in 30 ...

Taking the piste out of Alpine vegetation

...feel the heat of climate change, developing higher altitude runs and using more artificial snow to keep skiers happy. As this happens, Wipf and her co-workers want ski resorts to become more environmentally sensitive. "We recommend that environmental goals should be established in ski resort management. In p...

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