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Tag: "declining" at biology news

Pesticides choke pathway for nature to produce nitrogen for crops

... "Our research provides another explanation for declining crop yields," Fox said. "We showed that by applyin... is a previously unforeseen factor contributing to declining crop yields." The researchers say that field-wide experiments now are needed, in addition to test...

DNA analysis suggests under-reported kills of threatened whales

...r added, "but it seems likely that it is small and declining because of the unregulated exploitation." The study focused on minke whales in the Sea of Japan known as "J stock." These genetically distinct whales are found closer to shore than other minke breeds, and were hunted to threatened levels until th...

Power-boosting signal in muscle declines with age

..., the researchers set out to determine whether the declining mitochondrial function and increased intracellular fat content seen with aging could be traced back to deficiencies of AMPK. They compared AMPK activity in young and old rats following three "perturbations" that normally stimulate the enzyme and, in ...

Metacognition: Faced with a test, rats can check their knowledge first

...and were then given a choice of taking the test or declining it. Animals were taught that by electing to take t...fore, animals faced with the decision of taking or declining the test would, in principle, have the chance to weigh the likelihood that they would pass the test ...

How fish species suffer as a result of warmer waters

...es demonstrating a link between global warming and declining fish stocks were based entirely on statistical data. However, in order to estimate future changes, it is essential to develop a deeper understanding of the effect of water temperature on the biology of organisms under question. A new investigation, j...

Global 'sunscreen' has likely thinned, report NASA scientists

... reaching Earth's surface, which had been steadily declining in recent decades, suddenly started to rebound around 1990. This switch from a "global dimming" trend to a "brightening" trend happened just as global aerosol levels started to decline, Mishchenko said. While the Science paper does not prove that ...

Recently discovered species gain protection

...tanager, and a wintering population of the rapidly declining cerulean warbler ?a migratory songbird that nests in North America. "The area is such a remarkable center of micro-endemism that scientists believe more species may be there waiting to be discovered," said Claude Gascon of Conservation Internatio...

UCLA: How does your brain respond when you think about gambling or taking risks?

... example, to buy insurance when they rent cars and declining to buy extended warranties for products. When Fox was an undergraduate at the University of California, Berkeley, his faculty mentor was Daniel Kahneman, who later won the 2002 Nobel Memorial Prize in Economic Sciences. A key principle from Kahnem...

Global map shows new patterns of extinction risk

...d mountains of northern Australia are home to many declining frog species, although the precise causes of these declines often remain enigmatic. ...

Proteins may predict lung transplant rejection

...elevated levels of human neutrophil peptide (HNP), declining Clara cell secretory protein and some previously unidentified proteins were highly correlated with chronic lung rejection. In particular, the researchers found that HNP was three times more likely to be elevated among those who later suffered chronic...

Progress made in HIV vaccine development

... clear virus infected cells, and appear during the declining viremia following acute infection," explained Graham. "HIV-specific CD4 responses also peak early in infection; however this response diminishes soon after seroconversion. Maintenance of a functional HIV-specific CD4 T cell response correlates with...

Disappearing nest egg: Researcher studying declining numbers of macaws

...g," he says. There are several reasons for their declining numbers. The birds are highly prized by the pet t... learned that one reason the macaw populations are declining is due to the popularity of the Aguaje palm. It's highly-sought after by the local people for its f...

Fragmentation rapidly erodes Amazonian biodiversity

...22 different characteristics of the increasing and declining species. “Our results show that tree communities in fragments are being completely restructured,?said Nascimento. “Most vulnerable are trees specialized for living in the dark forest understory that need animals such as birds or bats to disperse th...

Cougar predation key to ecosystem health

...loss of cottonwood trees, eroding streambanks, and declining biodiversity. This "trophic cascade" of environmental degradation, all linked to the decline of a major predator, has been shown in a new study to affect a broad range of terrestrial and aquatic species, according to scientists from Oregon State Uni...

Race to halt global amphibian crisis boosted by rediscovery of endangered Colombian frogs

... else. The site also is a vital stopover point for declining neotropical migratory birds that breed in the United States and Canada, such as the Cerulean and Golden-winged Warblers. Fundación ProAves staff at the reserve and Magdalena University researchers found the two rediscovered frog species while conduc...

Pollution threatens coral health by preventing lesions from healing, UCF study shows

...mples. Scientists have long been concerned about declining coral reef health off the southeastern Florida coast, in the Florida Keys and worldwide. The World Research Institute's Reefs at Risk program has listed coastal development and treated wastewater discharge as chronic problems along Florida's southeas...

Wild bees and the flowers they pollinate are disappearing together

...y fell in almost 80% of them. Many bee species are declining or have become extinct in the UK [for detailed examples, see the attached case studies]. Lead author, Dr Koos Biesmeijer from the University of Leeds said: "We were shocked by decline in plants as well as bees. If this pattern is replicated elsewhe...

Alaska seal pup diet may hold key to decline of population

...s in the life of the harbor seal and could tie the declining population of seals and other marine mammals with the change in availability of seal prey, including herring," lead author Lori Polasek said. *Paper presentation: "Growth and body condition of harbor seals on high and low fat diets," 12:45 p.m.-3 p....

Salmon go veggie to save wild fish stocks

...afeeds and other purposes in the face of finite or declining annual global fish catches. To provide a solution with respect to fish oil, a team of scientists from the University of British Columbia and the Department of Fisheries and Oceans, Canada, have been studying the effects of replacing anchovy oil with ...

Chocolate milk could be key to longer, healthier life

...nately for much of New Zealand's ageing population declining muscle function means it simply isn't true. New research however from The University of Auckland's Faculty of Science aims to develop a non-pharmaceutical means to maintain muscle function and quality of life in older individuals. The good news is t...

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