If you need an accessible version of this item please contact JSTOR User Support

Some Attempts to Estimate Species Diversity and Population Density of Trees in Amazonian Forests

G. A. Black, Th. Dobzhansky and C. Pavan
Botanical Gazette
Vol. 111, No. 4 (Jun., 1950), pp. 413-425
Stable URL: http://www.jstor.org/stable/2472845
Page Count: 13
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
Some Attempts to Estimate Species Diversity and Population Density of Trees in Amazonian Forests
Preview not available

Abstract

1. Counts of trees with trunks more than 10 (or 20) cm. in diameter have been made on three 1-hectare (100 x 100 m.) plots in the vicinity of Belem, state of Pera, and at Tefe, state of Amazonas. The species were delimited with the assistance of native tree specialists, and whenever possible identified by vernacular as well as by scientific names. On the three plots 60, 87, and 79 species have been recorded among 564, 423, and 230 individuals, respectively. 2. Analysis of the data with the aid of PRESTON'S (6) "octave" method suggests that we have encountered probably no more than half the species which exist in the associations studied. Most of the rare, and some of the moderately common, species are missing on our plots. The population densities of many species of trees in the Amazonian Hylea are less than one individual per hectare.

Page Thumbnails

  • Thumbnail: Page 
413
    413
  • Thumbnail: Page 
414
    414
  • Thumbnail: Page 
415
    415
  • Thumbnail: Page 
416
    416
  • Thumbnail: Page 
[417]
    [417]
  • Thumbnail: Page 
418
    418
  • Thumbnail: Page 
[419]
    [419]
  • Thumbnail: Page 
[420]
    [420]
  • Thumbnail: Page 
421
    421
  • Thumbnail: Page 
422
    422
  • Thumbnail: Page 
423
    423
  • Thumbnail: Page 
424
    424
  • Thumbnail: Page 
425
    425