• Full text available at: JSTOR Biological Sciences Current
• Available from 2002 volume: 77 issue: 1.
  
• Full text available at: JSTOR Ecology & Botany Current
• Available from 2002 volume: 77 issue: 1.
  
• Full text available at: JSTOR Life Sciences Current
• Available from 2002 volume: 77 issue: 1.
  
• Full text available at: EBSCOhost Academic Search Complete
• Available from 09/01/1999.
  Most recent 1 year(s) not available.
  

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