ch17ppt - ENT100 Lecture 17 How Insects Get Around...

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ENT100 Lecture 17 How Insects Get Around
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Dispersal Types Dispersal = the capacity of an insect to move from its birthplace elsewhere 1. Usually confined to adult stage in insects 2. Is normal part of life cycle 3. Occurs in response to habitat modification caused by natural or human processes.
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Movement Unidirectional dispersal = individuals move in focused manner in one direction. Migration is unidirectional dispersal Multidirectional migration = individuals move in unfocused fashion
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Types of Dispersal Active movement – flying swimming running walking Passive movement – hitchhiking (phoresy) aerial plankton ballooning rafting/floating hosts historic rafting
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Origins of Dispersal Short-term ecological processes Long-term – a historical processes
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Origins of Dispersal Short-term – ecological processes Natural selection favors individuals that leave birth place: 1. Moving away avoids competition with parents at birth site 2. Individuals concentrated at birth site cause environmental changes
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Short-term (Annual) Migrations Allows them to exploit best conditions in both areas Insects that cannot fly generally not capable of long distance annual migrations Short-term migrations involve individuals Examples: Ladybugs in California Aphids in California Monarch butterflies
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Migration In any given species: 1. Usually only one life stage migrates 2. Usually only adults - monarchs 3. Rarely adults and juveniles – locusts
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Dragonflies Pantala America Sympetrum Green darners migrate out into desert regions to feed Sympetrum corruptum
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Orthoptera Mormon Cricket outbreaks
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Orthoptera Locusts
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Lepidoptera Uraniid moths migrate through Central & South America
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Lepidoptera California Roosts: Muir Woods Pacific Grove Monarchs
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ch17ppt - ENT100 Lecture 17 How Insects Get Around...

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