Tag: "decline" at biology news

New evidence points to pollution as main cause of much coral reef destruction

...ever, determining the main cause or causes of this decline has proven a much more contentious issue. In the c...ajor repercussions for managers working to end the decline of reefs in South Florida and around the world. When seaweed, or macroalgae, spreads over coral ree...

Scientists' findings may lead to better understanding of how that sleep develops, matures

...g after sleep onset (WASO) decreased. However, the decline of the latter did not reach statistical significan...EMS expressed as percentage of TST showed a marked decline during maturation, whereas QS/NREMS increased between 2 weeks and 4 months and stabilized thereafter...

Keeping populations of cerulean warbler healthy

...species have declined an estimated 70 percent, the decline tied to the fragmentation and destruction of habit...ca confirm habitat loss as the main reason for the decline of cerulean warbler populations. Studies have also found a growth in populations of cerulean warbler...

UF study: World shark attacks sink again, may signal long-term trend

...use patterns, Burgess said. But the three-year decline in attacks may be the result of factors that indicate a longer-term trend, such as the possibility there are fewer sharks and people together in the water where they could meet, Burgess said. "The first explanation that comes to mind is that there ar...

AMA Alzheimer's Media Briefing

...w risk factors for stroke are related to cognitive decline of Alzheimer's BREAKING NEWS: Distinguishing different types of dementia CAN WE PREVENT ALZHEIMER'S?: Using tantalizing clues from recent studies to reduce risk ADVANCES IN TREATMENT: Recent discoveries about Alzheimer's disease process leads to...

Peregrine falcons may face new environmental threat

... the brink of extinction after World War II. Their decline was blamed mostly on organochlorine pesticides like DDT, which were linked to thin-shelled eggs that broke during incubation. While BDEs do not produce the eggshell thinning associated with DDT, there has been some evidence of neurobehavioral problem...

MIT helps unlock life-extending secrets of calorie restriction

...of NAD. During calorie restriction, levels of NADH decline in cells. This decrease in NADH allows NAD to better activate Sir2 and thereby extend life span. "These findings provide a simple model for activation of Sir2 and extension of life span by calorie restriction," the authors write. "Our findings sugge...

Science paper: Overharvesting of Brazil nuts leading to fewer trees

...azil nut trees can live 500 years or longer, their decline won't affect harvests anytime soon. On the contrary, the scientists say consumers should buy more of the nuts, because they support an environmentally friendly industry that depends on rainforest preservation rather than destruction. The study revea...

Academy Harbor Consortium releases letter on mercury to President Bush

...emissions from coal-fired power plants alone would decline from approximately 48 tons to about five tons. This matters because there is a direct link between mercury emitted to the atmosphere and mercury levels in fish--both those fish caught in our lakes and streams and the commercial fish caught in ...

Traditional Christmas snack under threat

...here the trees are found are required to avert the decline of Brazil nut populations and the erosion of this cornerstone of the Amazonian economy."...

Can the mode of training affect the hormone response to different modes of exercise?

...ength. Among older men, it may help to replace the decline in testosterone, which can negatively affect body ...ortisol : The concentrations of cortisol tended to decline across time, particularly in the resting session, consistent with the typical diurnal pattern of cor...

Sport hunting hits evolutionary traits in bighorn sheep

...ted harvesting of trophy rams has contributed to a decline in the very traits that determine trophy quality," wrote the researchers. Wildlife managers should look at alternative strategies "to minimize further deterioration of the genetic quality of bighorn sheep." A world-class trophy ram is a valu...

Growth hormone activates gene involved in healing damaged tissue

...ld help explain why we age. "Growth hormone levels decline as we grow older; as a result, the Foxm1b gene sto...rowth in children and young adults, but its levels decline during aging. "The literature had suggested that growth hormone therapy in elderly men stimulates c...

Squirrel invasion sows seeds of change for future forests

..., the number of gray squirrels in forests began to decline as more forest habitat was converted for agriculture, he said. The problem with this shift in species is that gray squirrels and red squirrels don't store nuts and seeds in the same way, and they play different roles in the forest community, Goheen s...

Stop to smell the flowers - But do it before they're pollinated

...ctive process that follows pollination, triggers a decline in scent production. In addition, their research h...n index." Changes in this index contribute to the decline in scent emission after pollination in snapdragons, Dudareva said. "It's a feedback loop, and both c...

Climate linked to reproduction of right whales

...egative "flip" in the NAO in 1996 and a subsequent decline in copepod abundance in 1998. Then a sudden return of the NAO to positive conditions from 1997 to 2000 led to a 10-fold boom in copepod populations. Consequently, the northern right whales produced more calves in 2001 than at any time since records b...

Genes control severity of heart failure, study finds

...gests that distinct genes may underlie the gradual decline in heart function characteristic of heart failure and the risk of sudden death associated with the disease." The next step will be to identify the precise genes within these regions that modify heart failure outcome, using the sequenced mouse and hum...

By the year 2050, human population could add 2.6 billion people, reports Rockefeller scientist

...cites assume that fertility rates will continue to decline and that more effective preventions and treatments against HIV and AIDS will be implemented and major catastrophes such as biological warfare, severe climate change, or thermonuclear holocaust will not be inflicted on the human population and the pla...

OHSU researchers reveal relationship between weight gain and female hormones

... was to determine whether, and to what extent, the decline in these hormones have an effect on body weight in an effort to better understand and proactively treat obesity." To conduct this research, Cameron along with graduate student Elinor Sullivan and other colleagues studied 47 adult female monkeys. Nin...

Whalley picked for keynote address at The Gerontological Society of America's 2003 Annual Meeting

...estyle is crucial in preventing the risk of mental decline later in life. He also reports that lifestyle changes in middle age can reduce difficulties down the road. The choice of Whalley as speaker for the November meeting is ideal, since this year's Presidential Interdisciplinary Symposia seek to represent...

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