Abstract
The vegetation analysis of a Central Amazonian igapo, a forest under severe environmental stress — poor soil and seasonal flooding, reveals the existence of the dominant species Myrciaria dubia with a M.I.V. 75. The Shannon diversity index of this forest is 4.358 bits per individual, of which 75.73% is attributable to the evenness value. Species distributions change along the moisture gradient. Though many species exhibit the tendency of zonal distribution, the boundaries of zones are not abrupt. The authors suggest that species distribution is the result of physiological difference to flood tolerance. Further research should be directed to the comparison of flood tolerance of the plants which occur in the following three areas: permanent water-logged area, beach area with open canopy and upper area with closed canopy. The various adaptive strategies to seasonal inundation and drought, and the reproductive potential of the forest also merit further studies.
Highlights
Dittus (1977) poir.teà out that thare is a marked contrast between maximum importance values (M.I.V.) of a temperatezone forest in Wisconsin (M .I.V. = 228) and equatorial rainforests in Brazil and in
The vegetation analysis of a Central Amazonian igapó, a forest under severe environmental stress poor soil and seasonal flooding, revea ls the existence of the dominant species Myrciaria dubia with a M.I.V. 75 The Shannon diversity mdex of this forest is 4.358 bits per individual. of whlch 75.73% is attributable to the evenness valuc
Species distributions change along the moisture gradient
Summary
The purpose of this study was to investigate the effect of this environmental stress on the igapó vegetation, and especial ly to determine the relationship between stress and dominance
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