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Versie door Daphnisd op 23 jul 2009 om 11:56
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. An insulating layer of fat between skin and muscle layer in aquatic mammals such as whales and seals.
- ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain.