15Dispersal - A n n o u n c e m e n ts O v e r a ll life h...

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1 Announcements Lab quiz today Field trips coming up Galbreath Apr 26 Pepperwood May 4 Deadlines Insect collection May 14 Field Journal May 12 Overall life history patterns Adult • wings • reproductive organs mature • may be long lived or may lack mouthparts Voltinism • Numbers of generations per year – Univoltine- • one generation per year • Tends to occur in colder climates, where season length limits time for completion of life cycle – Bivoltine- two generations per year – Multivoltine • Multiple generations per year • Occurs when enough time exists for completion of multiple reproductive cycles
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2 Diapause • Arrested development after physiological change • Inactive and not feeding • Can last months or years • Need 2 nd physiological change to break diapause • Induced or terminated by photoperiod, temperature, food quality, food chemistry • Types – Obligatory- required to complete life cycle regardless of environment, often found in univoltine insects
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This note was uploaded on 03/02/2012 for the course BIOLOGY 323 taught by Professor Rank during the Spring '08 term at Sonoma.

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15Dispersal - A n n o u n c e m e n ts O v e r a ll life h...

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