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Tag: "tropics" at biology news

Scientists close in on missing carbon sink

...med a large amount of carbon was coming out of the tropics and moving through the atmosphere to be absorbed in other regions. But the new analysis of aircraft samples shows that this is not the case. "With this new information from aircraft samples we see that the models were overestimating the amount of ...

Scientists: As rainfall changes, tropical plants may acclimate

...idering that as the Earth warms, some areas of the tropics are widely expected to be wetter, some drier. So, at least one of dozens of variables that will change with precipitation changes ?nutrient uptake ?might not affect tropical plants. That said, plenty of others could, Schuur said. ...

Confirmed -- deforestation plays critical climate change role

... year into the atmosphere. "Deforestation in the tropics accounts for nearly 20 per cent of carbon emissions due to human activities," Dr Canadell says. "This will release an estimated 87 to 130 billion tonnes of carbon by 2100, which is greater than the amount of carbon that would be released by 13 years ...

Mosquito genes explain response to climate change

...ccurring in nature anywhere in the world, from the tropics to the polar regions. The newly created map contains 900 million DNA base pairs. There are three billion base pairs in humans. As various genome maps are being completed, scientists now face the task of determining how genes interact and how they ...

Twenty of world's 162 grouper species threatened with extinction

...f commercial fishes in chilled fish markets of the tropics and sub-tropics. Around the world, consumers pay up to $50 per kilogram for grouper. “This shows that over-fishing could decimate another major food and economic resource for humans, similar to the loss of the cod stocks off New England and Canada...

Volcanic eruptions, ancient global warming linked

...face temperatures by five degrees (Celsius) in the tropics and more than six degrees in the Arctic. The findings were reported in this week’s edition of Science. The study is important, experts say, because it documents the Earth’s response to the release of large amounts of greenhouse gases ?carbon diox...

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. Many researcher...

Are genomic technologies the answer to world hunger?

...ational Crops Research Institute for the Semi-Arid tropics (ICRISAT) highlights the need for greater and more efficient collaboration between the public and private sectors involved in this research. The Director of Development Partnerships for the International Potato Centre (CIP), Dr. Roger Cortbaoui, ech...

New dwarf buffalo discovered by chance in the Philippines

...evolution of small-bodied species elsewhere in the tropics such as the proposed new hominid, Homo floresiensis, found on the Indonesian island of Flores in 2003. "Whether or not Homo floresiensis ultimately is shown to be a new dwarf hominid species, discovery of this new fossil water buffalo provides additi...

Arctic coring expedition continues to yield new clues

...ls of these plants ?known only to originate in the tropics before the PETM ?are commonly seen in the ACEX cores. Furthermore, the chemistry of the organic carbon in the ACEX cores may rule out some earlier theories about what caused the PETM. The diminution of these alternate explanations strongly suggests t...

Tropical forest CO2 emissions tied to nutrient increases

...opical forests," said Cleveland. "Processes in the tropics affect what is happening around the globe, so this...leveland. While slash-and-burn agriculture in the tropics often reduces soil phosphorus in the long run, the practice can initially make more phosphorus avail...

The vicious cycle of rainforest destruction

...on Lloyd: "The two major vegetation systems in the tropics are rainforest and savanna. As it gets warmer and drier the rainforest gets invaded by savanna, which has fewer trees and holds less carbon in the soil. Savanna also doesn't recycle water in the same way as rainforest, so the carbon loss from the sav...

Taking evolution's temperature: Researchers pinpoint the energy it takes to make a species

...hange in the form and structure of plankton in the tropics and that it increases exponentially because of tem...mperatures at different latitudes ranging from the tropics to the arctic. The results agreed closely with predictions of their model. "It takes more energy th...

Climate change drives widespread amphibian extinctions

...red harlequin frogs once lived near streams in the tropics of Central and South America, but about two-thirds vanished in the 1980s and 1990s. In the famed Costa Rican cloud forests, for example, the Monteverde harlequin frog disappeared in the late 1980s, as did the golden toad, whose much-publicized extin...

Parts of the Caribbean and Central America are likely to have less summer rain

...uced global warming, he said. "The regions in the tropics that get a lot of summer precipitation are going t...itude of drying trends in other regions within the tropics but disagree on where it will occur. The Caribbean/Central-American region is an example where the m...

Extinctions linked to climate change

...ease of humans, is increasing its range out of the tropics and is now found in parts of the southern United States. And predicting how climate change will favor a certain pathogen or disease transmission is extremely difficult. "We should expect the unexpected," Blaustein and Andy Dobson of Princeton Univer...

Next good dinosaur news likely to come from small packages

...constructing who eats who in the food web from the tropics to the arctic. The trail is laid by stubbornly durable molecules. She uses mass spectrometry, an analytical technique that determines what molecules are present. Molecules may be tiny, but they can be tough, Ostrom said. The plant that a mastodon mu...

Satellites show Amazon parks, indigenous reserves stop forest clearing

... deforestation. The idea that many parks in the tropics only exist 'on paper' must be re-examined as must the notion that indigenous reserves are less effective than parks in protecting nature." While previous studies had queried park managers about reserve performance, this study is the first to ev...

Why the Amazon rainforest is so rich in species

...d supposedly to periods of profound drought in the tropics generally, and in the Amazon basin particularly. F...o evolve into multiple species yet, whereas in the tropics the climate changes were less severe and so older species survived, and rapidly evolving groups were...

Same-sex mating by fungi spawned infection outbreak, evidence suggests

...Cryptococcus gattii, is normally restricted to the tropics and subtropics. The researchers said their findings provide important additional insight into the origin of the Vancouver Island outbreak, which began in 1999. Moreover, the evidence that sex played an important role in the pathogen's expansion may ...

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