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The Influence Of Disturbance On Tropical Rain Forest Biodiversity : End Of A Controversy In Sight
The many species which make up tropical rain forest tree communities show widely differing reactions to environmental factors. This is particularly so with regard to light. Pioneer species, highly heliophile (light-loving or shade-intolerant), establish themselves by taking advantage of canopy light gaps opened up by treefalls. Rapid growth, a... view more... (2002-01-03)
Rainforest conservation worth the cost, University of Alberta shows
The economic benefits of protecting a rainforest reserve outweigh the costs of preserving it, says University of Alberta research-the first of its kind to have conducted a cost-benefit analysis on the conservation of species diversity. view more (2005-11-01)
New insights into the diversity of Creutzfeldt-Jakob disease agents
Researchers from the United Kingdom and France have identified four separate biochemical subgroups in a selection of cases of Creutzfeldt-Jakob disease. view more (2008-03-18)
HIV's path out of Africa: Haiti, the US then the world
The AIDS virus entered the United States via Haiti, probably arriving in just one person in about 1969, earlier than previously believed, according to new research. view more (2007-10-30)
Conservation of freshwater fish biodiversity: a challenge for the countries of the South
Humans have regularly been introducing exotic species into natural environments in order to provide for their nutritional necessities or meet less indispensable purposes such as horticulture, fishing or hunting. view more (2008-03-27)
The Fancier the Cortex, the Smarter the Brain?
Why are some people smarter than others? In a new article in Current Directions in Psychological Science, a journal of the Association for Psychological Science, Eduardo Mercado III from the University at Buffalo, The State University of New York, describes how certain aspects of brain structure and function help determine how easily we learn new... view more... (2009-07-17)
The song doesn't remain the same in fragmented bird populations
The song of passerine birds is a conspicuous and exaggerated display shaped by sexual selection in the context of male-male competition or mate attraction. At the level of the individual, song is considered an indicator of male 'quality'. view more (2008-03-19)
More species in the tropics because species have been there longer
Why are there more species in the tropics than in the temperate regions of the globe? Many of the world's species live in the tropics (perhaps more than half), but the reason has been debated for more than 100 years. view more (2006-11-02)
Yerkes researchers show early life nurturing impacts later life relationships
Researchers at the Yerkes National Primate Research Center, Emory University, have demonstrated that prairie voles may be a useful model in understanding the neurochemistry of social behavior. view more (2009-09-01)
Organic nitrogen gives new clue to biodiversity
Scientists have found that organic nitrogen is more important for plant growth than previously thought and could contribute to maintaining diversity in grasslands. view more (2006-04-12)
A possible ancient origin for tuberculoses in Casablanca
Each year tuberculosis kills about three million people in the world. In particular it is responsible for the death of more than one-third of HIV- infected people, who prove particularly susceptible owing to a decline in immune defences. The agent responsible is a bacterium of the species Mycobacterium tuberculosis, also termed Koch's bacillus,... view more... (2004-11-23)
Spread of endogenous retrovirus K is similar in the DNA of humans and rhesus monkeys
According to paleontologic and molecular studies, the chimpanzee (Pan troglodytes) is the closer relative to the humans (Homo sapiens) and that both lineages had a common ancestor at 5 to 7 million years ago. view more (2007-10-10)
Study: Rain forest insects eat no more tree species than temperate counterparts
A study initiated by University of Minnesota plant biologist George Weiblen has confirmed what biologists since Darwin have suspected-that the vast number of tree species in rain forests accounts for the equally vast number of plant-eating species of insects. view more (2006-08-24)
Diversity of trees in Ecuador's Amazon rainforest defies simple explanation
Trees in a hyper-diverse tropical rainforest interact with each other and their environment to create and maintain diversity, researchers report in the Oct. 24 issue of the journal Science. view more (2008-10-24)
Foreign threats to US raise tolerance for diversity, study finds
Foreign threats to the United States can encourage tolerance for diversity domestically and a corresponding intolerance for diversity internationally, according to a study by University of British Columbia (UBC) and Stanford University researchers published this week in Journal of Personality and Social Psychology. view more (2008-08-06)
Invasive species alter habitat to their benefit
When scientists study habitats that alien species have invaded, they usually find predictable patterns. The diversity of native species declines, and changes occur in natural processes such as nutrient cycling, wildfire frequency and the movement of water through the system. view more (2006-08-10)
Seals quickly respond to gain and loss of habitat under climate change
Southern Elephant seals responded rapidly to climate and habitat change and established a new breeding site thousands of kilometres from existing breeding grounds, according to new research. view more (2009-07-10)
Characterization of grapevine transposons furthers understanding of in vino variety
The grapevine (Vitis vinifera) is a widely cultivated crop that has been subjected to intensive breeding since the Neolithic period (from ~10,500 to ~6,000 years ago). The domestication of grapevine has undergone a selection for traits important for its cultivation and usage. view more (2008-09-03)
Dog DNA study yields clues to diverse size of breeds
From the smallest Chihuahua to the largest Great Dane, dogs dramatically vary in size, much more than most other animals. Now scientists have discovered a genetic basis for this diversity. view more (2007-04-06)
Novel virus detection identifies new viruses in study of respiratory infections and asthma attacks
A new study has found an unexpected number of viruses and viral subtypes in patients with respiratory tract infections (RTIs). The technique used in the study may help identify new viruses associated with human diseases. view more (2007-09-07)
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