Botanical Literature Details

• Author(s)

  ter Steege, H., Pitman, N., Sabatier, Daniel R. L., Castellanos, Hernán, Hout, P. V. D., Daly, Douglas C., Silveira, Marcos, Phillips, O., Vasquez, R., van Andel, Tinde R., Duivenvoorden, J., Oliveira, Alexandre A. de, Ek, R., Lilwah, R., Thomas, R., van Essen, J., Baider, C., Maas, Paulus J. M., Mori, S. A.

• Article or Chapter Title

  A spatial model of tree alpha-diversity and tree density for the Amazon.

• Year

  2003

• Journal or Book

  Biodiversity and Conservation. 12(11): 2255-2277

• Notes

  Abstract
  
  Large-scale patterns of Amazonian biodiversity have until now been obscured by a sparse and scattered inventory record. Here we present the first comprehensive spatial model of tree a-diversity and tree density in Amazonian rainforests, based on the largest-yet compilation of forest inventories and bolstered by a spatial interpolation technique that allows us to estimate diversity and density in areas that have never been inventoried. These data were then compared to continent-wide patterns of rainfall seasonality. We find that dry season length, while only weakly correlated with average tree a-diversity, is a strong predictor of tree density and of maximum tree a-diversity. The most diverse forests for any given DSL are concentrated in a narrow latitudinal band just south of the equator, while the least diverse
  2256
  forests for any given DSL are found in the Guayana Shield and Amazonian Bolivia. Denser forests are more diverse than sparser forests, even when we used a measure of diversity that corrects for sample size. We propose that rainfall seasonality regulates tree a-diversity and tree density by affecting shade tolerance and subsequently the number of different functional types of trees that can persist in an area.
  
  KEYWORDS = Amazon, botanical inventory, ecology, Guayana Shield, tree density, tree diversity.