ES_100_Lecture_8_posted

ES_100_Lecture_8_posted - Announcements: Section this week...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
    Announcements: Section this week will be outside. Section will be held rain or shine. Meet on lagoon side of UCEN on lower part of lawn. FIRST MIDTERM next Monday. No bluebook needed. NO MAKE UPS.
Background image of page 1

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

View Full DocumentRight Arrow Icon
    Finish up from last time r versus K-selected species TRAITS OF SPECIES TRAITS OF ENVIRONMENTS WHERE THEY WILL DO BEST
Background image of page 2
    r species (spend most of their lives in near- exponential phase of growth) Early reproduction High allocation to reproduction High population turnover Little investment in long term structures Poor competitors for resources K species (spend most of lives in K dominated growth phase) Later age at first reproduction Lower birth rates Less total allocation to reproduction Slower growing Longer lived Good at competing for resources (covered in end of chapter 5, Townsend)
Background image of page 3

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

View Full DocumentRight Arrow Icon
    r habitats Disturbed (newly opened) Temporary high resource pulses Ephemeral K habitats Crowded environments Constant environment Little opportunity for rapid growth
Background image of page 4
    Is this categorization valuable ? There ARE many exceptions to this simple categorization BUT Provides a framework to think about types of selective pressures that might have brought about a species life history traits Provides an expectation of sorts of species you will see under different environmental regimes
Background image of page 5

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

View Full DocumentRight Arrow Icon
  Alternatives to r vs K categorization Continuum from extreme r-selected to extreme K with lots of in between ? Conduct multivariate statistical analysis of all species in a region to see if they split out into clear life history categories (Australian scientist did this for a region of E. Au, found 17 discrete groupings of life history
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 40

ES_100_Lecture_8_posted - Announcements: Section this week...

This preview shows document pages 1 - 7. Sign up to view the full document.

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