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The likelihood that a habitat, community or individual (or individual colony) of a species will be exposed to an external factor to which it is sensitive.
- McLeod C.R. (1996).Glossary of marine ecological terms, acronyms and abbreviations used in MNCR work. In Marine Nature Conservation Review: rationale and methods. (Edited by K. Hiscock). Peterborough: Joint Nature Conservation Committee. Appendix 1, pp. 93-110.