Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

http://ufdc.ufl.edu/UF00095456/00036

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : HAL CCSD Wiley
Résumé :  
A digital land cover map of South America has been produced using remotely sensed satellite data acquired between 1995 and the year 2000. The mapping scale is defined by the 1 km spatial resolution of the map grid-cell. In order to realize the product, different sources of satellite data were used, each source providing either a particular parameter of land cover characteristic required by the legend, or mapping a particular land cover class. The map legend is designed both to fit requirements for regional climate modelling and for studies on land cover change. The legend is also compatible with a wider, global, land cover mapping exercise, which seeks to characterize the world's land surface for the year 2000. As a first step, the humid forest domain has been validated using a sample of high-resolution satellite images. The map demonstrates both the major incursions of agriculture into the remaining forest domains and the extensive areas of agriculture, which now dominate South America's grasslands.
ISSN: 1354-1013

hal-01032088
https://hal.archives-ouvertes.fr/hal-01032088
DOI : 10.1111/j.1529-8817.2003.00774.x

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : University of Belize University of Belize ( Belize )

Éditeur(s) : HAL CCSD American Association for the Advancement of Science
Résumé : International audience
Most eukaryotic organisms are arthropods. Yet, their diversity in rich terrestrial ecosystems is still unknown. Here we produce tangible estimates of the total species richness of arthropods in a tropical rainforest. Using a comprehensive range of structured protocols, we sampled the phylogenetic breadth of arthropod taxa from the soil to the forest canopy in the San Lorenzo forest, Panama. We collected 6144 arthropod species from 0.48 hectare and extrapolated total species richness to larger areas on the basis of competing models. The whole 6000-hectare forest reserve most likely sustains 25,000 arthropod species. Notably, just 1 hectare of rainforest yields >60% of the arthropod biodiversity held in the wider landscape. Models based on plant diversity fitted the accumulated species richness of both herbivore and nonherbivore taxa exceptionally well. This lends credence to global estimates of arthropod biodiversity developed from plant models.
ISSN: 0036-8075

hal-00817285
https://hal.archives-ouvertes.fr/hal-00817285
https://hal.archives-ouvertes.fr/hal-00817285/document
https://hal.archives-ouvertes.fr/hal-00817285/file/1226727Revisedtext.pdf
DOI : 10.1126/science.1226727