Tag: "tropics" at biology news

Oldest evidence for processing of wild cereals: starch grains from barley, wheat, on grinding stone

... to chronicle plant domestication in the New World tropics [see references, below]. Harvard University archaeologist, Ehud Weiss and Dani Nadel, at the University of Haifa, had excavated a well-known paleo site in Israel, Ohalo II and carried out analysis of the numerous macroscopic remains of seeds and fr...

Save the rainforest - eat a tree

...n North America's temperate zone. Yet the tropics really aren't different than other regions in terms of variations in soil, altitude and rainfall. So why do tropical rainforests have greater species diversity? "In a world without herbivores, our study predicts there would be a much lower...

Ecology drives the worldwide distribution of human diseases

...ns of disease, with diseases once relegated to the tropics migrating to temperate zones, for example. Identifying the links between ecology and disease, however, could lay the foundation for effective preventive strategies....

$5.5 million awarded to tree-ring research and climate studies

... latitudes of both hemispheres to the low-latitude tropics of Asia and the Americas. Many of these studies have successfully developed and used tree-ring analyses to reconstruct and produce better understanding of both continental and oceanic climate variations. Tree-Ring Reconstructions of Asian Monsoon C...

Unexpected changes in Earth's climate observed on the dark side of the moon

... earth's infrared (heat) radiation observed in the tropics by satellites, comprise a large influence on Earth's radiation budget. "Our results are only part of the story, since the Earth's surface temperature is determined by a balance between sunlight that warms the planet and heat radiated back into space...

Increasing ozone over the Atlantic ocean

... and unexpectedly, however, in the subtropics, the tropics and the southern hemisphere, ozone increases since 1980 have been much larger. In some regions the ozone levels have even doubled in two decades. The area where the high ozone concentrations have been measured is mostly downwind of Africa, and the re...

New environmental journalism website holds more than 700 articles in three languages

...gual platform that give journalists throughout the tropics the ability to share their work and experiences with their colleagues." Organized by Conservation International, the International Center for Journalists (ICFJ) and the International Federation of Environmental Journalists (IFEJ), the Award was found...

Pacific leatherback turtle could go extinct in 10 years

..., the leatherback has graced ocean waters from the tropics to the Arctic since the time of the dinosaurs more than 100 million years ago. But scientists have documented a precipitous decline of the Pacific leatherback in the past two decades. Since 1982, their numbers have dropped from approximately 115,000 ...

First phylogeographic study of a rainforest tree

In species-rich rainforests of the New World tropics most trees have broad geographic distributionsfrom...across a natural range that includes the New World tropics and Africa. Symphonia globulifera also has a detailed fossil pollen record, which the authors used ...

Changing one gene launches new fly species

...ent species, with one group adapted to life in the tropics and the other suited to cooler climates. The tropical group was more tolerant of starvation but less tolerant of cold. The temperate group was less able to resist starvation but better adapted to cool weather. The altered gene also changed the fl...

Nutrient-poor oceans generate their food 'hot spots'

... at the Equator which acts as a wave-guide. In the tropics two main types of wave can be distinguished: Kelvin waves, which propagate from West to East along the Equator, and Rossby waves, which slowly cross from East to West in tropical latitudes. Kelvin waves arrive at the American coasts where they are re...

Forest preservation work turns to Carolina hemlock

...ciate professor of forestry. "Deforestation in the tropics and subtropics has been going on for decades," he said, "with adverse impacts on important plant ecosystems as well as the overall environment. In addition, many of the forest practices simply aren't sustainable, and economies suffer as resources are...

In tropics, forests are cool but croplands are hotter

...r, and native grasslands are better adapted to the tropics than crops, in ways that also have a cooling effect. Lahouari Bounoua, a researcher at the University of Maryland (UMD), College Park, Md., and NASA's Goddard Space Flight Center (GSFC), Greenbelt, Md., used a computer model to show that temperatur...

Lake ecosystem critical to East African food supply is threatened by climate change

...ilize the water column in lakes, especially in the tropics where, unlike in temperate regions, winter cooling and mixing is absent. The increased stabilitydecreased circulation, hampering the re-supply of nutrients from the deep water to the surface waters of the lake where they help algae grow. The algae,...

Nickel, the environment and biodiversity in New Caledonia

...onservation and restoration of mining sites in the tropics and to make recommendations as to the prospects for furthering research and on applications to mining. Nickel represents New Caledonia's main wealth. About one-quarter of the world's reserves in that metal are deposited under surface of the country, ...

Nature cover story - Only 10% of all large fish are left in global ocean

...e communities of these large fish species from the tropics to the poles." This study not only confirms the bad news emerging from individual fisheries showing that species like cod can be fished below recovery, but it also reveals a grim global mosaic that demands immediate action. "The impact we have had on...

Early Mars: Warm enough to melt water?

... ice clouds. This might have allowed at least the tropics to remain above freezing. One problem with methane-producing bacteria is that the ones we know here on Earth, both from the fossil record and today, prefer warm environments. Some geologic processes generate methane, but only in small amounts. The...

An origin of new world agriculture in coastal Ecuador

...ghlands. The fertile and amazingly diverse lowland tropics seem like a likely place for agriculture to develop. But few plant remains survive mold, high temperatures and rainfall. Luckily for archaeologists, one of the ways that plants protect themselves from herbivores and pathogens is to form hardened pi...

Tropical Science for the 21st Century

...s dirty as they experience the biodiversity of the tropics and discover (or rediscover) how to conduct science in one of the most complex environments on earth. Celebration Banquet , San Jos, April 2 Scientific Symposium , University of Costa Rica, April 3Edward O. Wilson, one of the founders of OTS and a...

GSA release 02-55: Dec. Geology & GSA Today media highlights

...hward from cool, high temperate latitudes into the tropics toward the Laurentian plate, closing the Iapetus Ocean. As the gap between Avalonia and Laurentia decreased and the climate of Avalonia warmed, the indigenous fauna became progressively extinct. Laurentian species were then able to migrate and insin...

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