15 Migration - MIGRATION A form of biological dispersion...

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MIGRATION A form of biological dispersion
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TFTD: Migration Migrate . Intransitive verb . Etymology. Latin, migrare = to move from one place to another 1 : to move from one country, place, or locality to another 2 : to move, usually periodically, from one region or climate to another for feeding or breeding
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Famous migrations
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Other well-known animal migrations Swallows to San Juan Capistrano o ~1/2 bird species migrate (4,000 spp) Gray whales, Baja to Alaska Arctic terns (Arctic-Antarctic) Salmon
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To Move In biology this is referred to as dispersion o It’s important for organisms to have their space – two categories Density-independent dispersal o Population size doesn’t matter o Relies on transportation – wind/water currents, gravity…
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Dispersion Density-dependent dispersal o Affected by local population sizes, resource competition, habitat quality and habitat size High populations/low resources create the need to seek out better conditions
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Dispersion Behavior and anatomy play a part in movement Migrating insects tend to be “motivated” behaviorally to get to some place and often are physically built to do so
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Other Reasons to Migrate Escape predation Avoid cold winters Avoid excessively dry and wet seasons Mix genes?
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Migration – a coping mechanism Many habitats are fine for parts of the
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