BIO 101 Chapter Notes - Chapter 9: Waggle Dance, Internal Fertilization, Parental Investment
4 Mar 2016
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Chapter 9: behaviors are traits that can evolve. Behavior has adaptive value, just like other traits (9. 1) Behavior- any and all of the actions performed by an organism, often in response to its environment or to the actions of another organism. When presented with mussels of different sizes, shore crabs prefer the mussels that provide the greatest amount of energy relative to the amount of energy a crab must expend to open the mussel. The largest mussels take too long to open and so are less preferred; the smallest mussels are easily opened but don"t provide enough caloric content to make the effort worthwhile. Thus, the research shows, shore crabs prefer medium-size mussels. Living and reproducing requires energy o o: maximal extraction of energy and acquisition of essential nutrients, natural selection can shape feeding behavior. Humans, shore crap example: maternal care o. Innate behaviors- behaviors that do not require environmental input for their development.
