ch16ppt - Lecture 16 Insect Defenses Stinging, Stinking and...

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Lecture 16 Insect Defenses – Stinging, Stinking and…
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Insects as Food Insects have an excellent nutritional value They are high in protein and fat, two things that all animals need Large number of animals, including humans, depend on insects for food.
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Entomophagy European cultures: Europe, North America, Australia are almost only ones that don’t eat insects In some regions insects may be major source of protein for humans Insects also integral part of traditional medicine in many parts of the world
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Insects as Food Many vertebrates rely on insects for food even carnivores, such as coyotes, owls and hawks In winter Davis barn owls eat Jerusalem crickets Birds can eat enormous numbers of insects One flicker stomach contained over 5,000 ants A captive robin ate 165 cutworms in one day Nestling birds consume more than their body weight in insects/day
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Search Images Vertebrate feeding behavior differs from insects Insects programmed to respond to narrow range of stimuli Vertebrates develop a search image They remember a particularly tasty prey – how it looked where to find it They’ll look for that prey even if it’s rarer than other equally edible items. Vertebrates become conditioned to avoid prey that sting, taste bad or make them ill
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Primary Defenses 1. Cryptic coloration 2. Müllerian mimicry 3. Batesian Mimicry 4. Aggressive mimicry
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Cryptic coloration = defense by hiding, camouflage Resembling background or inedible object Change color Cover with debris Hide
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ch16ppt - Lecture 16 Insect Defenses Stinging, Stinking and...

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