17Coevolution

17Coevolution - Announcements F ie ld t r ip s c o m in g u...

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1 Announcements Field trips coming up Galbreath Apr 26 • Meet at parking lot at 8:00 a.m. • Return by 5:00 p.m. • Bring collecting equipment • Also bring food and water and mosquito repellent Pepperwood May 4 Deadlines Insect collection May 14 Field Journal May 12 Secondary Compounds Behavioral Effects Repellant Inhibit oviposition or feeding Physiological Effects: Toxicity Qualitative Small molecular weight, poisonous compounds Usually found in ‘unapparent’ plants Specialist herbivores develop detozification Quantitative Large molecular weight digestibility reducers (e.g. tannins) Found in large ‘apparent’ plants Tend to support more generalist herbivores Other Determinants of Diet Host plant stress Plant defenses weakened Makes plant more favorable Resource rich plants Nitrogen needed to make proteins Nitrogen levels much lower in plants than animals Vigorously growing plants may provide more nutrient rich food
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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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17Coevolution - Announcements F ie ld t r ip s c o m in g u...

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