Migration patterns

Migration patterns - Migration Part 1 Patterns All...

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Migration Part 1: Patterns All terrestrial animals live in a seasonal environment - winter and summer (temperate zone) - dry and wet seasons (tropics) Food supply and energy budget affected These challenges are especially great in temperate zone for birds and mammals - cost of endothermy skyrockets in cold weather - there is less food to meet the increased energetic demands. Solution : Get out of there! Migrate (What do mammals do….?)
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Birds respond to seasonality by moving more than any other animals because - flight is an efficient way to travel - their high metabolic rates compel them to find lots of food. Consequently, they are found in regions almost devoid of other terrestrial vertebrates; they can move in quickly, tap resources, and “escape” Migration is a regular, large-scale population shift from a restricted breeding area to a restricted winter area Take a close look at this map…
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A common misconception Migratory and Non-migratory birds are radically different To understand migration, you have to look at the entire range of movements in birds Some species remain on territory year- round (many tropical insectivores; FL mockingbirds)
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A continuum of migration Some species give up territory after the breeding season and join flocks in the same area (chickadees) or move short distances (Clark’s Nutcrackers)
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A continuum of migration Some species in some years move far outside of their breeding area (snowy owls, crossbills) These are called “eruptive” species
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A continuum of migration Some species always move widely after breeding season. (Cedar Waxwings)
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This document was uploaded on 08/24/2011.

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Migration patterns - Migration Part 1 Patterns All...

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