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  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A central Amazonian terra firme forest. I. High tree species richness on poor soils (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 1219-1244 
    Details
    ISSN: 1572-9710
    Keywords: Amazonia ; species richness ; terra firme forest ; tree alpha diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tree size, density, and species richness were established for three one-hectare plots of terra firme forest in central Amazonian Brazil. In the three hectares, 1916 individual trees with DBH 10 ≥ cm were sampled. A total of 58 families, 181 genera, and 513 species were determined. Hectare A had 285 species, 138 genera, and 47 families; hectare B 280 species, 123 genera, and 48 families; and hectare C 280 species, 125 genera, and 44 families. Comparably high species richness in Amazonia has heretofore only been reported from western Amazonia. This dispels the idea that high species richness can only develop in areas with rich soils and relatively high rainfall. It is suggested that such high species richness is the result of a combination of habitat heterogeneity and geological history. These high diversity forests, because they occur on nutrient poor soils, can be protected with little or no impact on development in the region because the soils are essentially useless for agriculture and for supporting long-term cattle pasture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008908615271
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  • 2
    Electronic Resource
    Electronic Resource
    Geographic distribution of tree species occurring in the region of Manaus, Brazil: implications for regional diversity and conservation (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 1245-1259 
    Details
    ISSN: 1572-9710
    Keywords: alpha-diversity ; Amazonia ; conservation ; distribution patterns ; phytogeography ; Pleistocene ; refuge theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The alpha-diversity of trees found in the region of Manaus, Brazil is among the highest recorded for one-hectare plots in Amazonia or any tropical forest. Based on a survey of the distributions of 2541 Neotropical tree species, we analyzed the geographic distribution of 364 species of terra firme forest trees that occur in the region and that are not edaphic specialists. Fifteen distinct distribution patterns were recognized for trees occurring in Manaus. The great majority of species (84.9%) have continuous, somewhat restricted distributions, 35 (9.6%) show broad distributions and 20 species (5.5%) show disjunction between Amazonia and Eastern Brazil. A remarkable 150 (41.2%) of these species showed the region of Manaus as one of their distribution limits. Using the same pool of 2541 species distributions, the percentage of species with a distribution limit in Manaus was compared with that for other localities known to be centers of botanical collection. The null hypothesis that the difference in proportion of species with distribution limits among these localities and Manaus is insignificant was rejected. We conclude that the results are not an artifact of collecting density, that Manaus is indeed a crossroads of distinct phytogeographic regions, and that this explains part of the high species diversity of trees in the region of Manaus. A number of scenarios proposed for the Pleistocene in Amazonia postulate some degree of fragmentation of Amazonian forests or at least populations. As much as these theories may conflict with each other in some respects, they are compatible with the concept of Manaus as a region of re-convergence of isolated or disrupted floras and faunas. The significance of the vicinity of Manaus in the history of the Amazon flora and its current status as a repository for surprisingly high tree diversity highlights the need to make this region a conservation priority.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008972901159
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    Paper (German National Licenses)
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