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Introduction
Overview
Mechanisms
   Exclusion
      D. spicata and S. alterniflora
   Excretion
      S. alterniflora
   Succulence
   Osmotic Adjustment
      S. alterniflora
   Membrane Composition
      S. patens
Community Structure
References
Relative importance of exclusion, excretion, and accumulation 
in Spartina alterniflora
(Bradley and Morris 1991)


Bradley and Morris (1991) investigated the roles of different mechanisms of salinity tolerance in the salt marsh species Spartina alterniflora.  While they found that Spartina alterniflora secretes excess salts when exposed to increased salinity, they concluded that the salt exclusion was quantitatively the most important mechanism used by the plant (Table 1).  This was demonstrated by calculating the contribution of each process (secretion, exclusion, and accumulation) as a percentage of the theoretical maximum ion uptake that can occur passively (Table 1). 
 

Table 1:  Mean (and standard deviation) secreted, accumulated, and excluded ions expressed as relative percent of theoretical maximum uptake in increasing salinity (after Bradley and Morris 1991).
 
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Last Updated 12/8/99