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Chapter 29

BIOL 1010 Chapter 29: Topic 29.8

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c98 Bio 1010 38.5 Negative effects of predation on reproductive success have evolved adaptations to survive predators. Ex: camoflauge, mechanical defenses- sharp quills of porcupine and hard shells of clams and oysters, chemical defences—bright colour patterns yellow, orange, or red in combo with black this causes predators to associate these colour patterns with painful stings or nasty taste, 38.6 Herbivory affects plant reproduction—not as fatal as predation Some adaptions plants use are: thorns, spines; chemical toxins—tend to be distasteful therefore herbivores tend to avoid them ex: poison strychnine, morphine, nicotine, sulphur compounds, milkweed Coevolution: series of reciprocal evolutionary adaptations in two species. Occurs when a change in one spedcies acts as a new selective force on another species, in resulting adaptatipns of the second species in turn affect selection of individuals in first species 38.7 trophic structure: sequence of food up trophic levels is known as food chain Producers—autotrophs(self feeders)- use light energy to power synthesis of organic compounds. Plants main producers on land, water: unicellular protists and cyanobacteria Primary consumers(heterotrophs): eat plants, algae or phytoplankton ex: grasshopp
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