Lecture 07-las-life_history

Lecture 07-las-life_history - Life histories Laurie...

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Life histories Laurie Campbell Updated 25 January 2010 LAS
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Buddy questions A few seeds of golden rod, loblolly pine and red maple arrive in a recently abandoned field outside Gainesville. Which of these species do you think will be most abundant if you return to the still abandoned field in three years? Why? (think about how these species live their lives - how fast do they grow? how fast do they reproduce? How many seeds do they produce? how well do they deal with shade?) What if you return in thirty years? Soldiago altissima Golden rod
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Magnolia grandifolia Schizachyrium scoparium
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S. scoparium M. grandifolia Age at maturity Year 1 ~15 years Life span <35 years 200 years Number of seeds/year many Not as many # of reproductive events Many, also fragments Many, also sprouts Seed size ~0.005 g (a guess) ~0.1 g Leaf life span 1 season ~ 2 years Flowering time/phenology Summer (?) April - June Seed dispersal wind Birds and mammals Magnolia grandifolia Schizachyrium scoparium Note: data in the table are approximate values and not from peer
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Trade-offs - You can go to Cancun for spring break or you can buy a new computer. You don’t have enough money to do both. A guppy can produce a bunch of small offspring or a few larger offspring. It can’t produce a bunch of large offspring.
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Trade-offs in the allocation of resources underlie life histories Organisms are limited in: - Time - Energy - Nutrients rganisms must allocate their resources to achieve maximum fitness.
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xample: Does an increase in the number of seeds produced by an oak tree contribute to increased fitness? Roundrock
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This note was uploaded on 07/13/2011 for the course PCB 4034C taught by Professor Osenberg during the Spring '11 term at University of Florida.

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Lecture 07-las-life_history - Life histories Laurie...

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