tropical forests – Shamskm: A site to exchange knowledge and solutions

Gold Mining Ravages Perú

By Guest PostOctober 29, 2013Environmentaquatic life, cao, carnegie, claslite, ernesto raez luna, gold mining, greg asner, high resolution, lidar, madre de dios, map, mercury pollution, monitoring system, peru, peruvian amazon, satellite methods, small mining operations, tropical forests

Washington, DC—For the first time, researchers have been able to map the true extent of gold mining in the biologically diverse region of Madre De Dios in the Peruvian Amazon. The team combined field surveys with airborne mapping and high-resolution satellite monitoring to show that the geographic extent of mining has increased 400% from 1999 to 2012 and that the average annual rate of forest loss has tripled since the Great Recession of 2008. Until this study, thousands of small, clandestine mines that have boomed since the economic crisis have gone unmonitored. The research is published in the online early edition of the Proceedings of the National Academy of Sciences the week of October 28, 2013.

The team, led by Carnegie’s Greg Asner in close collaboration with officials from the Peruvian Ministry of Environment, used the Carnegie Landsat Analysis System-lite (CLASlite) to detect and map both large and small mining operations. CLASlite differs from other satellite mapping methods. It uses algorithms to detect changes to the forest in areas as small as 10 square meters, about 100 square feet, allowing scientists to find small-scale disturbances that cannot be detected by traditional satellite methods. (more…)

80% of Malaysian Borneo Degraded by Logging

By Guest PostAugust 18, 2013Environmentcarnegie institution, claslite, claslite system, degradation, diverse ecosystem, forest loss, global hotspot, greg asner, jane bryan, logging, malaysian borneo, malaysian states, papua new guinea, phil shearman, rainforests, sabah, sarawak, Science, tropical forest ecosystems, tropical forests, university, university of tasmania

Washington, DC — A study published in the July 17, issue of the journal PLOS ONE found that more than 80% of tropical forests in Malaysian Borneo have been heavily impacted by logging. (more…)

Growing Threats to Biodiversity ‘Arks’

By Guest PostJuly 25, 2012Natureafrica, agalychnis callidryas, arks for biodiversity, asia-pacific, barro colorado island, biodiversity arks, bukit palong, cameroon, carolina usech, cyclopes didactylus, deforestation, forest elephant, green iguana, iguana iguana, kadiri serge bobo, loxodonta cyclotis, national park, oil palm plantation, panama, peninsular malaysia, red eyed treefrog, silky anteater, skull, southern gabon, thomas smith, threats, tropical americas, tropical forests, tropical research, university of dschang, william laurance

Many of the protected areas in tropical nations are struggling to sustain their biodiversity, according to a study by more than 200 scientists from around the world. The study, which will appear Thursday in the journal Nature, found that deforestation is advancing rapidly in these nations and most reserves are losing some or all of their surrounding forest.

Among the scientists participating in the study were lead author Professor William Laurance of James Cook University in Cairns, Australia, and the Smithsonian Tropical Research Institute in Panama, who is also a senior research fellow at UCLA’s Center for Tropical Research; and Thomas Smith, a professor at UCLA’s Institute of the Environment and Sustainability and director of UCLA’s Center for Tropical Research. (more…)

Ancient Popcorn Discovered in Peru

By Guest PostJanuary 26, 2012Scienceacademia nacional de la historia, andean region, ceramic pottery, coast of peru, corn microfossils, corncobs, dolores piperno, duccio bonavia, grains, huaca prieta, human welfare, husks, kernels, maize, male flowers, Mexico, panama, panama city, paredones, phytoliths, popcorn, smithsonian tropical research institute, south america, stalks, tassels, teosinte, tom dillehay, tropical ecosystem, tropical forests, tropical nature, vanderbilt university, wild grass

People living along the coast of Peru were eating popcorn 2,000 years earlier than previously reported and before ceramic pottery was used there, according to a new paper in the Proceedings of the National Academy of Sciences co-authored by Dolores Piperno, curator of New World archaeology at the Smithsonian’s National Museum of Natural History and emeritus staff scientist at the Smithsonian Tropical Research Institute.

Some of the oldest known corncobs, husks, stalks and tassels (male flowers), dating from 6,700 to 3,000 years ago were found at Paredones and Huaca Prieta, two mound sites on Peru’s arid northern coast. The research group, led by Tom Dillehay from Vanderbilt University and Duccio Bonavia from Peru’s Academia Nacional de la Historia, also found corn microfossils: starch grains and phytoliths. Characteristics of the cobs—the earliest ever discovered in South America—indicate that the sites’ ancient inhabitants ate corn several ways, including popcorn and flour corn. However, corn was still not an important part of their diet. (more…)

Close Family Ties Keep Microbial Cheaters in Check, Study Finds

By Guest PostDecember 16, 2011Scienceamoebae, Antarctica, canopies, clonal lineage, cosmopolitan groups, david queller, deserts, dicty, dictyostelium discoideum, e coli, evolution, forest park, genes, jennie kuzdzal fick, joan strassmann, kissing kin, life cycles, multicellular organisms, mutation, national science foundation, obligate cheaters, sam scheiner, sara fox, single cell, slime mold, social amoeba, st. louis, tropical forests, washington university

*Experiments on “slime mold” explain why almost all multicellular organisms begin life as a single cell*

Any multicellular animal, from a blue whale to a human being, poses a special challenge for evolution.

Most of the cells in its body will die without reproducing; only a privileged few will pass their genes to the next generation.

How could the extreme degree of cooperation required by multicellular existence actually evolve? Why aren’t all creatures unicellular individualists determined to pass on their own genes? (more…)

New NASA Map Reveals Tropical Forest Carbon Storage

By Guest PostJune 2, 2011Environmentcarbon monitoring, carbon stock change, longevity of forests, satellite data, tropical forests

PASADENA, Calif. – A NASA-led research team has used a variety of NASA satellite data to create the most precise map ever produced depicting the amount and location of carbon stored in Earth’s tropical forests. The data are expected to provide a baseline for ongoing carbon monitoring and research and serve as a useful resource for managing the greenhouse gas carbon dioxide. (more…)

Why Are Vines Overtaking the American Tropics?

By Guest PostFebruary 15, 2011Environment, ScienceAmazon, american tropics, barro colorado island, beauty kingdom, bolivian smazon, brazil, carbon, carbon storage, el nino events, english ivy, forest canopy, forests, french guiana, human communities, impact on animals, japanese honeysuckle, kudzu, liana vines, milwaukee, oliver phillips, oriental bittersweet, panama, planet, Smithsonian, south carolina, stefan schnitzer, subtropical forests, tropical forests, united states, vines

A Million-Dollar Question

Sleeping Beauty’s kingdom was overgrown by vines when she fell into a deep sleep. Researchers at the Smithsonian in Panama and the University of Wisconsin at Milwaukee received more than a million dollars from the U.S. National Science Foundation to discover why real vines are overtaking the American tropics. Data from eight sites show that vines are overgrowing trees in all cases.

“We are witnessing a fundamental structural change in the physical make-up of forests that will have a profound impact on the animals, human communities and businesses that depend on them for their livelihoods,” said Stefan Schnitzer, research associate at the Smithsonian Tropical Research Institute in Panama and associate professor at the University of Wisconsin at Milwaukee. (more…)

Carnegie Airborne Observatory: Mapping Video

By Guest PostJanuary 14, 2011Environmentairborne methods, canopy, carbon, deforestation, degradation, forests, global ecology, global project, greg asner, land use practices, map, monitoring carbon storage and emissions, redd, reduced emissions from deforestation and degradation, tropical forests, united nations, vegetation, vital resources

Some 55% of tropical forests are negatively affected by land use practices and deforestation worldwide. But the ability to penetrate the canopy to see what’s going on has been lacking until now.

Global Ecology’s Greg Asner’s group has developed new airborne methods to peer through the canopy to measure and map, in beautiful 3-D, the underlying vegetation, degradation and deforestation, and the amount of carbon stored and emitted in these forests. (more…)

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