Lecture 12-Life History

Lecture 12-Life History - Life History and Aging Elements...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Life History and Aging Elements of Ecology: Chapter 8 (pp. 167-179) Evolutionary Analysis: Chapter 13 http://scribalterror.blogs.com/scribal_terror/images/2007/04/28/ducklings.jpg http://www.polarcruises.com/antarctica/articles/photos/articles/art_Penguins_emperor_and_chick.jpg
Background image of page 1

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

View Full DocumentRight Arrow Icon
Fitness Product of viability of the organism x fertility Survival x reproduction over a long, complex life Life History is the survival and reproduction of a species
Background image of page 2
Fitness requires reproduction Reproduction can be costly for the individual Reproduction can shorten lifespan Reproductive costs limit evolution
Background image of page 3

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

View Full DocumentRight Arrow Icon
Life History Adaptations of an organism that affect life table values of: age-specific survival fecundity (reproductive rate, age at maturity, reproductive risk)
Background image of page 4
Some Life History Traits Age at maturity Survival to breeding Annual adult survival/mortality (average of population)
Background image of page 5

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

View Full DocumentRight Arrow Icon
Some Life History Traits cont’d. Clutch size Clutches per year Egg weight Relative clutch mass (weight of all eggs)
Background image of page 6
Some Life History Traits cont’d. Maturity (age at first reproduction) Parity (number of reproductive episodes) Fecundity (number of offspring per reproductive episode)
Background image of page 7

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

View Full DocumentRight Arrow Icon
Some Life History Traits cont’d. Senescence (aging; deterioration with age) Mortality (end of life)
Background image of page 8
Life History Many types: Bacteria reproduce once (fission); no juveniles/adults Some insects are univoltine: one reproductive event per year, then death
Background image of page 9

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

View Full DocumentRight Arrow Icon
Life History: Semelparity Semelparity: plants and animals One reproductive event, then death Lots of offspring/seeds all at once, then parent dies A “boom or bust” strategy
Background image of page 10
Background image of page 11

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

View Full DocumentRight Arrow Icon
Chinook Salmon
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 49

Lecture 12-Life History - Life History and Aging Elements...

This preview shows document pages 1 - 13. Sign up to view the full document.

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