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Topic+10.+Reproductive+Strategies - Topic 10 Reproductive...

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Topic 10: Reproductive Strategies 0. We are now going to deal with m x basically. The next step toward fitness after mating. I. Three major questions A. Scheduling of reproduction: once or more than once? B. Expenditure per offspring C. Number of offspring per reproductive event (if reproduction occurs more than once) II. Scheduling. A. Two major patterns: 1. iteroparous : more than one reproductive event per lifetime 2. semelparous : one reproductive event per lifetime B. Examples of iteroparous 1. most perennial plants (Def of “perennial” is living more than one year) 2. most vertebrates, including humans C. Examples of semelparous 1. most annual plants (Def of “annual” is living one year) 2. Agave a perennial. Desert areas slide Waits 10 or more (up to ≈ 100) years to reproduce 3. Many insects – they are short-lived a. mayflies Order Ephemeroptera live one day as adults b. praying mantis – male eaten by female after mating -- the crescendo of his reproductive life slide 4. Pacific salmon – migrates upstream and dies
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D. The interesting question is why some long-lived species are semelparous. Not well explained. Ideas: 1. If interval between good years is long, wait and reproduce when good (a good year in deserts is a wet year). Agave has shallow roots and is semelparous. The related yucca (also in
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