EvolutionMechanisms160-page13 - Sampling an animal often...

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Evolutionary Mechanisms - 13 Physiological Adaptations promote survival by giving the organism a physiological advantage. Some physiological adaptations are: Low metabolic water requirements for desert organisms Increased number of rbcs in human populations that live at high altitude Insects that circulate antifreeze chemicals for arctic survival Heat-resistant enzymes in thermophilic bacteria Toxic metabolites (poisons or distasteful chemicals) This works well for plants since animals can sample the plant without causing permanent damage to either.
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Unformatted text preview: Sampling an animal often causes its death. Animals more often use chemicals for offensive behavior. • Examples • Slugs and tobacco. • Skunks, fire ants, beetles and scorpions that spray or sting Beetle Offense Poison Frog Skunk • An animal can incorporate a toxin or defense mechanism from something it eats resulting in second-hand toxins, too. Nudibranchs eat cnidarians and the cnidarian nematocysts are used by the nudibranch. Monarch larvae get their alkaloid taste from the milkweeds on which they feed. Monarch on milkweed glycosides...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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