Lecture_17_Lifehistories_7Mar2011

Lecture_17_Lifehistories_7Mar2011 - Re e be to turn in your...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Remember to turn in your homework Wednesday!
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
LIFE HISTORIES Chapter 12 Life History = the adaptations of an organism that influence aspects of its biology such as the number of offspring it produces, its survival and its size and age at reproductive maturity. Product of evolution through natural selection
Background image of page 2
Key assumption : All organisms have limited energy and other resources, resulting in ______________. trade-offs
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
T he principle of allocation (from Ch 7) If an organism allocates energy to one function, such as growth or reproduction, it reduces the amount of energy available to other functions such as defense.
Background image of page 4
Reproductive effort = the allocation of energy, time and other resources to the ___________________________. production and care of offspring
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What are some trade-offs that influence fitness? 1. Offspring number vs. offspring size
Background image of page 6
What are some trade-offs that influence fitness? 1. Offspring number vs. offspring size 1. Adult survival and age at first reproduction 1. Growth and reproduction 1. Offspring size and dispersal ability 1. Offspring number and parental care
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Examples: 1. Fish species vary greatly in reproductive effort
Background image of page 8
Ocean sunfish are the world’s heaviest bony fish, weighing up to 5,000 pounds (2,268 kg). Ocean sunfish may have the highest reproductive rate of all vertebrates. A four-foot (1.2 m) female contains approximately 300 million eggs . Beginning as larva one-tenth of an inch long
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 40

Lecture_17_Lifehistories_7Mar2011 - Re e be to turn in your...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online