Chapter 7 part II

Chapter 7 part II - Chapter 7 part II Life Histories-...

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Chapter 7 part II Life Histories- Senescence Senescence- increase in mortality and a decline in fecundity over time o Accumulation of defects Cells multiplying with defects o UV radiation cause DNA mutations o Rates of senescence affected by natural selection Variation in the enviro o Storage of food Acquires more resources/water/nutrients than needed for future periods of drought/famine Accumulating fat for warmth during the winter in artic o Dormancy Harsh environments that have periods of unbearable weather and the plant/animal is not capable of migrating it can enter an inactive state, dormancy Trees shedding leaves Hibernation- squirrels, bears since food is scarce in the winter Insects enter phase of diapause where water is chemically bound or reduced in quantity to prevent freezing and drop their metabolism so low that it’s not detectable by the body Costly time on the body, and reduces time that could be spent reproducing so it should be minimal time spent dormant
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This note was uploaded on 03/22/2012 for the course PB 360 taught by Professor Wentworth during the Fall '08 term at N.C. State.

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Chapter 7 part II - Chapter 7 part II Life Histories-...

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