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

Code (CO)	MSI04P3965
Author (AU)	ter Steege, H. Pitman, N. Sabatier, D. Castellanos, H. van der Hout, P. Daly, D. C. Silveira, M. Phillips, O. Vazquez, R. van Andel, T. Duivenvoorden, J. de Oliveira, A. A. Ek, R. Lilwah, R. Thomas, R. van Essen, J. Baider, C. Maas, P. Mori, S. Terborgh, J. Vargas, P. N. Mogollon, H. Morawetz, W.
Title - English (ET)	A spatial model of tree alpha-diversity and tree density for the Amazon
Document Type(DT)	periodical article
Date of publication (DP)	2003
Series (SE)	Biodiversity and Conservation
Source (SO)	12 (11): 2255-2277
Language of text (LT)	En
Language of summaries (LS)	En
Abstract (AB)	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 (alpha)-diversity and tree density in Amazonian rainforests, based on the largest-yet compilation of forest inventories and bolstered by a spatial interpolation technique that allos 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 weaky correlated with average (alpha)-diversity, is a strong predictor of tree density and of maximum tree (alpha)-diversity. The most diverse forests for any strong predictor of tree density and of maximum tree (alpha)-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 forests for any given DSL are found in the Fuayana 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 (alpha)-diversity and tree density by affecting shade tolerance and subsequently the number of different functional types of trees that can persist in an area.
Descriptors - English (DE)	Spatial model Tree density Amazon Ecology
Descriptors - Geographic (DG)	Brazil
Sort Key 1(K1)	Ecology
Date record entered (DA)	2004-01-28
Language of analysis (LA)	En
Location (LO)	Herb
Processing status (PS)	CAT
MSIRI Staff (MS)	Herb