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Biodiversity & Conservation
Migration
Periodic movement of organisms between alternative habitats e.g. between areas for reproduction and one or more areas non-reproductive activity, or between areas of foraging and areas used for other activities. Most migrations occur at predictable intervals triggered by stimuli e.g. un-favourable conditions. NB: Movements that do not include an obligatory return journey are classified as dispersal (Baretta-Bekker et al., 1992).
| Resident / Non-migratory | Remaining within the same area (from Lincoln et al.,1998). |
|---|---|
| Seasonal (feeding) | A seasonal migration for the purpose of following or moving to suitable feeding grounds. |
| Seasonal (reproduction) | A seasonal migration in order to reproduce. |
| Seasonal (environment) | A seasonal migration in order to remain within suitable environmental conditions. |
| Diel | Daily, pertaining to a 24 hour period. |
| Passive | A migration undertaken through the effects of tide, current or wind. |
| Active | A migration undertaken by active movement across the substratum or through the water column. |
References
- Baretta-Bekker, J.G., Duursma, E.K. & Kuipers, B.R. (ed.), 1992. Encyclopedia of Marine Sciences. Berlin: Springer-Verlag.
- Lincoln, R., Boxshall, G. & Clark, P., 1998. A dictionary of ecology, evolution and systematics (2nd ed.). Cambridge: Cambridge University of Press.
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