Lect. 13 life histories web

Lect. 13 life histories web - Life History = stages of life...

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Unformatted text preview: Life History = stages of life for an organism Number of offspring? How many usually survive? When do young mature (i.e. capable of reproduction)? How does environment affect these traits? What makes these traits adaptive? Offspring Number Versus Offspring Size Principle of Allocation: energy for one function reduces energy available for other functions. Leads to trade-offs b/n number and size of offspring. Which one do you suppose produces more offspring? If theres an option, why one over the other??? Offspring size may be adapted to successful dispersaltake plants Westoby et al. recognized 6 seed dispersal strategies: Unassisted : No specialized structures. Wind : Wings, hair, (resistance structures). Adhesion : Hooks, spines, or barbs. Ant : Oil surface coating (elaisome). Vertebrate : Fleshy coating (aril). Scatterhoarded : Gathered, stored in caches. Increasing seed size Now were getting somewhere Seed size is also related to growth form Westoby et al. recognized 4 plant forms: Graminoids : Grass and grass-like...
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This note was uploaded on 01/13/2012 for the course BIO 8 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

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Lect. 13 life histories web - Life History = stages of life...

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