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Versie door Daphnisd op 23 jul 2009 om 11:57
1) species characteristic of climate, soil and other conditions in a particular region or habitat. 2) species whose disappearance or disturbance gives early warning of the degradation of an ecosystem. 
- Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain.