9. Insectivorus Plants - Lecture 9 Insectivorous Plants I Charles Darwin Insectivorous Plants 1875 II 500 species of plants A Nitrogen poor soils B Acid

9. Insectivorus Plants - Lecture 9 Insectivorous Plants I...

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Lecture 9 Insectivorous Plants I. Charles Darwin “Insectivorous Plants” 1875 II. 500 species of plants A. Nitrogen- poor soils B. Acid bogs C. Heavy volcanic clays III. Mechanisms to “trap” insects (attractant) A. Sticky exudates (attractive to insects) - fly catcher, sundew
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Insectivorous Plants B. Modified structures (color or nectar) - pitcher plants C. Modified leaves (color or nectar-like substance) - Venus fly trap IV. Digestion - glands secret enzymatic fluid to digest insects (except exoskeleton) V. Absorb nutrients through plant tissues
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Sundew Pitcher plant Venus fly trap - active trap passive traps
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What insects do for a living: phytophages Phytophagous - feeds on living plants (herbivores) A. Plants are primary producers (autotrophs) B. Insects are consumers (heterotrophs) 1. Primary consumers - herbivory (phytophages) 2. Secondary or tertiary consumers (predators, parasitoids, parasites) 3. Scavengers
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