UIUC IB 203 - Life History (2 pages)

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Life History

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Life History


introduction to life history and trade off relationships

Lecture number:
Lecture Note
University of Illinois at Urbana, Champaign
Ib 203 - Ecology
Ecology Documents

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IB 203 1st Edition Lecture 6 Outline of Last Lecture Outline of Current Lecture I Life History II Main assumption III Trade off relationships Current Lecture Life history Schedule of an organism s life this includes Maturity Age at the organisms first reproduction Fecundity Number and size of offspring Parity Number of reproductive events Life span The course of the organisms aging Main assumption That there will consistently be a problem of limited time and resources that cause these traits to be the way that they are trade off Because there is a limited pool of resources as one factor is increased it will be allocated more resources and as a result another factor will suffer Trade off relationships Number of offspring per breeding vs adult survival between successive breeding attempts o Explanation the adult survival between successive breedings decreases as the number of offspring per breeding increases because the parents must allocate more resources to caring for offspring leaving the parents depleted and shortening their life spans Optimal age at maturity varies based on life span and age at first reproduction o Explanation If the organism can maintain a longer lifespan it might be beneficial for the species to wait to reproduce until a prime age because then it will be able to dedicate a greater amount of resources to that reproductive cycle These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Life span determines optimal allocation between growth and fecundity o If an organism has a shorter life span it would be beneficial to have slow growth and high fecundity whereas of it has a long life span rapid growth and low fecundity is ideal

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