Global warming threatens existence of tropical species

Washington, August 26 (ANI): A new research has determined that global warming threatens the existence of tropical species, the ecosystem and its by-products.

The research was done by herpetologist Laurie Vitt, curator of reptiles and George Lynn Cross Research Professor at the University of Oklahoma’s Sam Noble Museum of Natural History.

Vitt has studied the ecology of lizards in rain forests around the world and, for the past 20 years, as part of a biodiversity project in the Amazon.

As a fellow researcher on a study funded by the National Science Foundation, Vitt investigated the affects of global warming on tropical lizards and the diversity of the ecosystem.

“We depend on these tropical lizards and other species of animals and plants for food, materials, and pharmaceuticals, but we are losing these species as a result of global warming,” Vitt said.

Tropical species are affected more by the very narrow temperature range of their typically warm climate than are ectotherms living where the temperatures fluctuate in greater degrees.

Even the smallest change in the tropics makes a difference to the tropical species most susceptible to climate change.

“Climatic shifts are part of our natural history, but years of research indicate global warming has increased the rate at which climate change is taking place,” said Vitt.

As populations grow around the world, so does consumption. In the densest areas of the world, the elimination of animals that feed on disease vectors, such as mosquitoes and flies, adds to our growing human health problem.

“The loss of these predators, like tropical species, upset the natural biodiversity of the ecosystem,” said Vitt. “The effects may not be so obvious in the short term, but the long-term effects will be irreversible,” he added.

“Our ability to connect with nature and better understand tropical lizards is important because these animals serve as model organisms for detecting the effects of global warming,” Vitt summarized.

“Ecosystems are complex and interdependent. When one species becomes extinct, the entire system is affected. The long-term effects on human health can be dramatic,” he said. (ANI)

Grans may help keep kids away from developing negative age stereotypes

Washington, Aug 21 (ANI): The affectionate bond between kids and their grandmothers is well known. And now, a new study has revealed that frequent visits to nana’s place could keep toddlers away from developing negative old age stereotypes.

A variety of negative stereotypes are attributed to the elderly such as they are considered forgetful, hard-of-hearing, absent-minded and confused.

Lead researcher Sheree Kwong See from University of Alberta has identified that those stereotypes exist in some children at the age two and three, which could adversely affect them when they are older.

“We’ve been able to show really early on that kids, when they’re just starting to talk, have established beliefs about older people,” said Kwong See.

“We’re seeing what we could call ageism by about age three,” she added.

Kwong See and fellow researcher Elena Nicoladis measured the reactions of young children after being quizzed on vocabulary words by either an older or younger adult.

It showed that children who had less exposure to older adults had a stronger language bias against the older person than those who had more exposure to older people.

“If you are interacting with ‘nana’ more frequently, you’ll start to see that she’s a pretty good teacher of words even though she’s old,” said Kwong See.

“When you have little contact dominant negative cultural stereotypes emerge. You think an older person isn’t as alert or in-the-know as a young person and maybe is not as good a teacher,” she added.

However, Kwong See warns that frantic trips to grandmother’s house to curb the bias, is not the sole factor.

“They’re getting negative images of aging from cartoons, from their story books, from watching how other people interact with seniors,” she said.

“But, they’re also starting to pick up some of the positive images as well if they get lots of good interactions,” she added.

The study is published in the journal Educational Gerontology. (ANI)

Bilingual babies get an early edge – even before they can talk

Washington, April 14 (ANI): The experience of hearing two languages may give babies an early learning advantage – even before they can babble a single word, says a new study.

The study has shown that infants exposed to two languages (bilingual babies) quickly adapt to different learning cues at seven months old compared with babies from single-language households.

The findings may lead researchers to rethink how hearing two languages trains the young brain, even before babies have learned how to formulate words.

This early learning advantage may not necessarily translate into higher intelligence later on in life.

However, it does reveal that babies benefit early on from having bilingual exposure, when they themselves still babble nonsense.

“We believe that the enhancement is due more to perception at this age, rather than [language] production,” Live Science quoted Jacques Mehler, a cognitive neuroscientist at the International School for Advanced Studies in Trieste, Italy, as saying.

For the study, Mehler and fellow researcher Agnes Kovacs recruited ‘crib bilinguals’ from families in the Trieste area of Italy, where parents spoke to infants from birth using both Italian and Slovenian mother tongues.

The researchers taught bilingual and monolingual babies to look at one side of a screen in anticipation of a visual “reward” image of a puppet, after the infants first learned to associate a sound cue with the image.

The visual treat was then switched to the other side of the screen, so that researchers could see how quickly babies would learn to switch their anticipatory look to that other side.

Bilingual babies beat out monolingual babies in three such experiments, even when the sound cues changed from nonsense syllable combinations to a structured sound cue, and then a visual cue. In all three cases, bilingual babies soon learned to switch their anticipatory attention to the other side of the screen, whereas monolingual babies never adapted.

This clearly showed a bilingual baby advantage in thinking that involved so-called executive function, which helps regulate abilities such as being able to start and stop actions.

It also indicated that having early bilingual exposure could train the mind in a more general sense, rather than just a language-specific sense as some researchers had suggested.

The study appears in the April 13 issue of the journal Proceedings of the National Academy of Sciences. (ANI)

Tiny aquatic plant can clean up hog farms and be used for ethanol production

Washington, April 8 (ANI): Researchers at North Carolina State University have found that a tiny aquatic plant can be used to clean up animal waste at industrial hog farms and be used for ethanol production, thus contributing to solve the global energy crisis.

Their research shows that growing duckweed on hog wastewater can produce five to six times more starch per acre than corn, according to researcher Dr. Jay Cheng.
This means that ethanol production using duckweed could be “faster and cheaper than from corn,” said fellow researcher Dr. Anne-Marie Stomp.

“We can kill two birds – biofuel production and wastewater treatment – with one stone – duckweed,” Cheng said.

Starch from duckweed can be readily converted into ethanol using the same facilities currently used for corn, Cheng added.

Corn is currently the primary crop used for ethanol production in the United States.

However, its use has come under fire in recent years because of concerns about the amount of energy used to grow corn and commodity price disruptions resulting from competition for corn between ethanol manufacturers and the food and feed industries.

Duckweed presents an attractive, non-food alternative that has the potential to produce significantly more ethanol feedstock per acre than corn; exploit existing corn-based ethanol production processes for faster scale-up; and turn pollutants into a fuel production system.

The duckweed system consists of shallow ponds that can be built on land unsuitable for conventional crops, and is so efficient it generates water clean enough for re-use.

The technology can utilize any nutrient-rich wastewater, from livestock production to municipal wastewater.

Large-scale hog farms manage their animal waste by storing it in large “lagoons” for biological treatment.

Duckweed utilizes the nutrients in the wastewater for growth, thus capturing these nutrients and preventing their release into the environment.

In other words, “Duckweed could be an environmentally friendly, economically viable feedstock for ethanol,” said Cheng.

Cheng and Stomp are currently establishing a pilot-scale project to further investigate the best way to establish a large-scale system for growing duckweed on animal wastewater, and then harvesting and drying the duckweed. (ANI)